automotive/evs/1.1/default/EvsEnumerator.cpp - third_party/android/platform/hardware/interfaces - Git at Google

 /*
  * Copyright (C) 2019 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 "android.hardware.automotive.evs@1.1-service"

 #include "EvsEnumerator.h"
 #include "EvsCamera.h"
 #include "EvsDisplay.h"
 #include "EvsUltrasonicsArray.h"

 namespace android {
 namespace hardware {
 namespace automotive {
 namespace evs {
 namespace V1_1 {
 namespace implementation {


 // NOTE:  All members values are static so that all clients operate on the same state
 //        That is to say, this is effectively a singleton despite the fact that HIDL
 //        constructs a new instance for each client.
 std::list<EvsEnumerator::CameraRecord>              EvsEnumerator::sCameraList;
 wp<EvsDisplay>                                      EvsEnumerator::sActiveDisplay;
 unique_ptr<ConfigManager>                           EvsEnumerator::sConfigManager;
 sp<IAutomotiveDisplayProxyService>                  EvsEnumerator::sDisplayProxyService;
 std::unordered_map<uint8_t, uint64_t>               EvsEnumerator::sDisplayPortList;
 std::list<EvsEnumerator::UltrasonicsArrayRecord>    EvsEnumerator::sUltrasonicsArrayRecordList;

 EvsEnumerator::EvsEnumerator(sp<IAutomotiveDisplayProxyService> windowService) {
     ALOGD("EvsEnumerator created");

     // Add sample camera data to our list of cameras
     // In a real driver, this would be expected to can the available hardware
     sConfigManager =
         ConfigManager::Create("/vendor/etc/automotive/evs/evs_default_configuration.xml");

     // Add available cameras
     for (auto v : sConfigManager->getCameraList()) {
         sCameraList.emplace_back(v.c_str());
     }

     if (sDisplayProxyService == nullptr) {
         /* sets a car-window service handle */
         sDisplayProxyService = windowService;
     }

     // Add available displays
     if (sDisplayProxyService != nullptr) {
         // Get a display ID list.
         sDisplayProxyService->getDisplayIdList([](const auto& displayIds) {
             for (const auto& id : displayIds) {
                 const auto port = id & 0xF;
                 sDisplayPortList.insert_or_assign(port, id);
             }
         });
     }

     // Add ultrasonics array desc.
     sUltrasonicsArrayRecordList.emplace_back(
             EvsUltrasonicsArray::GetMockArrayDesc("front_array"));
 }


 // Methods from ::android::hardware::automotive::evs::V1_0::IEvsEnumerator follow.
 Return<void> EvsEnumerator::getCameraList(getCameraList_cb _hidl_cb)  {
     ALOGD("getCameraList");

     const unsigned numCameras = sCameraList.size();

     // Build up a packed array of CameraDesc for return
     // NOTE:  Only has to live until the callback returns
     std::vector<CameraDesc_1_0> descriptions;
     descriptions.reserve(numCameras);
     for (const auto& cam : sCameraList) {
         descriptions.push_back( cam.desc.v1 );
     }

     // Encapsulate our camera descriptions in the HIDL vec type
     hidl_vec<CameraDesc_1_0> hidlCameras(descriptions);

     // Send back the results
     ALOGD("reporting %zu cameras available", hidlCameras.size());
     _hidl_cb(hidlCameras);

     // HIDL convention says we return Void if we sent our result back via callback
     return Void();
 }


 Return<sp<IEvsCamera_1_0>> EvsEnumerator::openCamera(const hidl_string& cameraId) {
     ALOGD("openCamera");

     // Find the named camera
     CameraRecord *pRecord = nullptr;
     for (auto &&cam : sCameraList) {
         if (cam.desc.v1.cameraId == cameraId) {
             // Found a match!
             pRecord = &cam;
             break;
         }
     }

     // Is this a recognized camera id?
     if (!pRecord) {
         ALOGE("Requested camera %s not found", cameraId.c_str());
         return nullptr;
     }

     // Has this camera already been instantiated by another caller?
     sp<EvsCamera> pActiveCamera = pRecord->activeInstance.promote();
     if (pActiveCamera != nullptr) {
         ALOGW("Killing previous camera because of new caller");
         closeCamera(pActiveCamera);
     }

     // Construct a camera instance for the caller
     if (sConfigManager == nullptr) {
         pActiveCamera = EvsCamera::Create(cameraId.c_str());
     } else {
         pActiveCamera = EvsCamera::Create(cameraId.c_str(),
                                           sConfigManager->getCameraInfo(cameraId));
     }
     pRecord->activeInstance = pActiveCamera;
     if (pActiveCamera == nullptr) {
         ALOGE("Failed to allocate new EvsCamera object for %s\n", cameraId.c_str());
     }

     return pActiveCamera;
 }


 Return<void> EvsEnumerator::closeCamera(const ::android::sp<IEvsCamera_1_0>& pCamera) {
     ALOGD("closeCamera");

     auto pCamera_1_1 = IEvsCamera_1_1::castFrom(pCamera).withDefault(nullptr);
     if (pCamera_1_1 == nullptr) {
         ALOGE("Ignoring call to closeCamera with null camera ptr");
         return Void();
     }

     // Get the camera id so we can find it in our list
     std::string cameraId;
     pCamera_1_1->getCameraInfo_1_1([&cameraId](CameraDesc desc) {
                                cameraId = desc.v1.cameraId;
                            }
     );

     // Find the named camera
     CameraRecord *pRecord = nullptr;
     for (auto &&cam : sCameraList) {
         if (cam.desc.v1.cameraId == cameraId) {
             // Found a match!
             pRecord = &cam;
             break;
         }
     }

     // Is the display being destroyed actually the one we think is active?
     if (!pRecord) {
         ALOGE("Asked to close a camera who's name isn't recognized");
     } else {
         sp<EvsCamera> pActiveCamera = pRecord->activeInstance.promote();

         if (pActiveCamera == nullptr) {
             ALOGE("Somehow a camera is being destroyed when the enumerator didn't know one existed");
         } else if (pActiveCamera != pCamera_1_1) {
             // This can happen if the camera was aggressively reopened, orphaning this previous instance
             ALOGW("Ignoring close of previously orphaned camera - why did a client steal?");
         } else {
             // Drop the active camera
             pActiveCamera->forceShutdown();
             pRecord->activeInstance = nullptr;
         }
     }

     return Void();
 }


 Return<sp<IEvsDisplay_1_0>> EvsEnumerator::openDisplay() {
     ALOGD("openDisplay");

     // If we already have a display active, then we need to shut it down so we can
     // give exclusive access to the new caller.
     sp<EvsDisplay> pActiveDisplay = sActiveDisplay.promote();
     if (pActiveDisplay != nullptr) {
         ALOGW("Killing previous display because of new caller");
         closeDisplay(pActiveDisplay);
     }

     // Create a new display interface and return it
     pActiveDisplay = new EvsDisplay();
     sActiveDisplay = pActiveDisplay;

     ALOGD("Returning new EvsDisplay object %p", pActiveDisplay.get());
     return pActiveDisplay;
 }


 Return<void> EvsEnumerator::getDisplayIdList(getDisplayIdList_cb _list_cb) {
     hidl_vec<uint8_t> ids;

     ids.resize(sDisplayPortList.size());
     unsigned i = 0;
     for (const auto& [port, id] : sDisplayPortList) {
         ids[i++] = port;
     }

     _list_cb(ids);
     return Void();
 }


 Return<sp<IEvsDisplay>> EvsEnumerator::openDisplay_1_1(uint8_t port) {
     ALOGD("%s", __FUNCTION__);

     // If we already have a display active, then we need to shut it down so we can
     // give exclusive access to the new caller.
     sp<EvsDisplay> pActiveDisplay = sActiveDisplay.promote();
     if (pActiveDisplay != nullptr) {
         ALOGW("Killing previous display because of new caller");
         closeDisplay(pActiveDisplay);
     }

     // Create a new display interface and return it
     pActiveDisplay = new EvsDisplay(sDisplayProxyService, sDisplayPortList[port]);
     sActiveDisplay = pActiveDisplay;

     ALOGD("Returning new EvsDisplay object %p", pActiveDisplay.get());
     return pActiveDisplay;
 }


 Return<void> EvsEnumerator::closeDisplay(const ::android::sp<IEvsDisplay_1_0>& pDisplay) {
     ALOGD("closeDisplay");

     // Do we still have a display object we think should be active?
     sp<EvsDisplay> pActiveDisplay = sActiveDisplay.promote();
     if (pActiveDisplay == nullptr) {
         ALOGE("Somehow a display is being destroyed when the enumerator didn't know one existed");
     } else if (sActiveDisplay != pDisplay) {
         ALOGW("Ignoring close of previously orphaned display - why did a client steal?");
     } else {
         // Drop the active display
         pActiveDisplay->forceShutdown();
         sActiveDisplay = nullptr;
     }

     return Void();
 }


 Return<DisplayState> EvsEnumerator::getDisplayState()  {
     ALOGD("getDisplayState");

     // Do we still have a display object we think should be active?
     sp<IEvsDisplay> pActiveDisplay = sActiveDisplay.promote();
     if (pActiveDisplay != nullptr) {
         return pActiveDisplay->getDisplayState();
     } else {
         return DisplayState::NOT_OPEN;
     }
 }


 // Methods from ::android::hardware::automotive::evs::V1_1::IEvsEnumerator follow.
 Return<void> EvsEnumerator::getCameraList_1_1(getCameraList_1_1_cb _hidl_cb)  {
     ALOGD("getCameraList");

     const unsigned numCameras = sCameraList.size();

     // Build up a packed array of CameraDesc for return
     // NOTE:  Only has to live until the callback returns
     std::vector<CameraDesc_1_1> descriptions;
     descriptions.reserve(numCameras);
     for (const auto& cam : sCameraList) {
         descriptions.push_back( cam.desc );
     }

     // Encapsulate our camera descriptions in the HIDL vec type
     hidl_vec<CameraDesc_1_1> hidlCameras(descriptions);

     // Send back the results
     ALOGD("reporting %zu cameras available", hidlCameras.size());
     _hidl_cb(hidlCameras);

     // HIDL convention says we return Void if we sent our result back via callback
     return Void();
 }

 Return<sp<IEvsCamera_1_1>>
 EvsEnumerator::openCamera_1_1(const hidl_string& cameraId,
                               const Stream& streamCfg) {
     // Find the named camera
     CameraRecord *pRecord = nullptr;
     for (auto &&cam : sCameraList) {
         if (cam.desc.v1.cameraId == cameraId) {
             // Found a match!
             pRecord = &cam;
             break;
         }
     }

     // Is this a recognized camera id?
     if (!pRecord) {
         ALOGE("Requested camera %s not found", cameraId.c_str());
         return nullptr;
     }

     // Has this camera already been instantiated by another caller?
     sp<EvsCamera> pActiveCamera = pRecord->activeInstance.promote();
     if (pActiveCamera != nullptr) {
         ALOGW("Killing previous camera because of new caller");
         closeCamera(pActiveCamera);
     }

     // Construct a camera instance for the caller
     if (sConfigManager == nullptr) {
         pActiveCamera = EvsCamera::Create(cameraId.c_str());
     } else {
         pActiveCamera = EvsCamera::Create(cameraId.c_str(),
                                           sConfigManager->getCameraInfo(cameraId),
                                           &streamCfg);
     }

     pRecord->activeInstance = pActiveCamera;
     if (pActiveCamera == nullptr) {
         ALOGE("Failed to allocate new EvsCamera object for %s\n", cameraId.c_str());
     }

     return pActiveCamera;
 }


 EvsEnumerator::CameraRecord* EvsEnumerator::findCameraById(const std::string& cameraId) {
     // Find the named camera
     CameraRecord *pRecord = nullptr;
     for (auto &&cam : sCameraList) {
         if (cam.desc.v1.cameraId == cameraId) {
             // Found a match!
             pRecord = &cam;
             break;
         }
     }

     return pRecord;
 }

 EvsEnumerator::UltrasonicsArrayRecord* EvsEnumerator::findUltrasonicsArrayById(
         const std::string& ultrasonicsArrayId) {
     auto recordIt = std::find_if(
             sUltrasonicsArrayRecordList.begin(), sUltrasonicsArrayRecordList.end(),
                     [&ultrasonicsArrayId](const UltrasonicsArrayRecord& record) {
                             return ultrasonicsArrayId == record.desc.ultrasonicsArrayId;});

     return (recordIt != sUltrasonicsArrayRecordList.end()) ? &*recordIt : nullptr;
 }

 Return<void> EvsEnumerator::getUltrasonicsArrayList(getUltrasonicsArrayList_cb _hidl_cb) {
     hidl_vec<UltrasonicsArrayDesc> desc;
     desc.resize(sUltrasonicsArrayRecordList.size());

     // Copy over desc from sUltrasonicsArrayRecordList.
     for (auto p = std::make_pair(sUltrasonicsArrayRecordList.begin(), desc.begin());
             p.first != sUltrasonicsArrayRecordList.end(); p.first++, p.second++) {
         *p.second = p.first->desc;
     }

     // Send back the results
     ALOGD("reporting %zu ultrasonics arrays available", desc.size());
     _hidl_cb(desc);

     // HIDL convention says we return Void if we sent our result back via callback
     return Void();
 }

 Return<sp<IEvsUltrasonicsArray>> EvsEnumerator::openUltrasonicsArray(
         const hidl_string& ultrasonicsArrayId) {
     // Find the named ultrasonic array.
     UltrasonicsArrayRecord* pRecord = findUltrasonicsArrayById(ultrasonicsArrayId);

     // Is this a recognized ultrasonic array id?
     if (!pRecord) {
         ALOGE("Requested ultrasonics array %s not found", ultrasonicsArrayId.c_str());
         return nullptr;
     }

     // Has this ultrasonic array already been instantiated by another caller?
     sp<EvsUltrasonicsArray> pActiveUltrasonicsArray = pRecord->activeInstance.promote();
     if (pActiveUltrasonicsArray != nullptr) {
         ALOGW("Killing previous ultrasonics array because of new caller");
         closeUltrasonicsArray(pActiveUltrasonicsArray);
     }

     // Construct a ultrasonic array instance for the caller
     pActiveUltrasonicsArray = EvsUltrasonicsArray::Create(ultrasonicsArrayId.c_str());
     pRecord->activeInstance = pActiveUltrasonicsArray;
     if (pActiveUltrasonicsArray == nullptr) {
         ALOGE("Failed to allocate new EvsUltrasonicsArray object for %s\n",
               ultrasonicsArrayId.c_str());
     }

     return pActiveUltrasonicsArray;
 }

 Return<void> EvsEnumerator::closeUltrasonicsArray(
         const sp<IEvsUltrasonicsArray>& pEvsUltrasonicsArray) {

     if (pEvsUltrasonicsArray.get() == nullptr) {
         ALOGE("Ignoring call to closeUltrasonicsArray with null ultrasonics array");
         return Void();
     }

     // Get the ultrasonics array id so we can find it in our list.
     std::string ultrasonicsArrayId;
     pEvsUltrasonicsArray->getUltrasonicArrayInfo([&ultrasonicsArrayId](UltrasonicsArrayDesc desc) {
         ultrasonicsArrayId.assign(desc.ultrasonicsArrayId);
     });

     // Find the named ultrasonics array
     UltrasonicsArrayRecord* pRecord = findUltrasonicsArrayById(ultrasonicsArrayId);
     if (!pRecord) {
         ALOGE("Asked to close a ultrasonics array whose name isnt not found");
         return Void();
     }

     sp<EvsUltrasonicsArray> pActiveUltrasonicsArray = pRecord->activeInstance.promote();

     if (pActiveUltrasonicsArray.get() == nullptr) {
         ALOGE("Somehow a ultrasonics array is being destroyed when the enumerator didn't know "
               "one existed");
     } else if (pActiveUltrasonicsArray != pEvsUltrasonicsArray) {
         // This can happen if the ultrasonics array was aggressively reopened,
         // orphaning this previous instance
         ALOGW("Ignoring close of previously orphaned ultrasonics array - why did a client steal?");
     } else {
         // Drop the active ultrasonics array
         pActiveUltrasonicsArray->forceShutdown();
         pRecord->activeInstance = nullptr;
     }

     return Void();
 }

 } // namespace implementation
 } // namespace V1_1
 } // namespace evs
 } // namespace automotive
 } // namespace hardware
 } // namespace android
	/*
	* Copyright (C) 2019 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 "android.hardware.automotive.evs@1.1-service"

	#include "EvsEnumerator.h"
	#include "EvsCamera.h"
	#include "EvsDisplay.h"
	#include "EvsUltrasonicsArray.h"

	namespace android {
	namespace hardware {
	namespace automotive {
	namespace evs {
	namespace V1_1 {
	namespace implementation {


	// NOTE: All members values are static so that all clients operate on the same state
	// That is to say, this is effectively a singleton despite the fact that HIDL
	// constructs a new instance for each client.
	std::list<EvsEnumerator::CameraRecord> EvsEnumerator::sCameraList;
	wp<EvsDisplay> EvsEnumerator::sActiveDisplay;
	unique_ptr<ConfigManager> EvsEnumerator::sConfigManager;
	sp<IAutomotiveDisplayProxyService> EvsEnumerator::sDisplayProxyService;
	std::unordered_map<uint8_t, uint64_t> EvsEnumerator::sDisplayPortList;
	std::list<EvsEnumerator::UltrasonicsArrayRecord> EvsEnumerator::sUltrasonicsArrayRecordList;

	EvsEnumerator::EvsEnumerator(sp<IAutomotiveDisplayProxyService> windowService) {
	ALOGD("EvsEnumerator created");

	// Add sample camera data to our list of cameras
	// In a real driver, this would be expected to can the available hardware
	sConfigManager =
	ConfigManager::Create("/vendor/etc/automotive/evs/evs_default_configuration.xml");

	// Add available cameras
	for (auto v : sConfigManager->getCameraList()) {
	sCameraList.emplace_back(v.c_str());
	}

	if (sDisplayProxyService == nullptr) {
	/* sets a car-window service handle */
	sDisplayProxyService = windowService;
	}

	// Add available displays
	if (sDisplayProxyService != nullptr) {
	// Get a display ID list.
	sDisplayProxyService->getDisplayIdList([](const auto& displayIds) {
	for (const auto& id : displayIds) {
	const auto port = id & 0xF;
	sDisplayPortList.insert_or_assign(port, id);
	}
	});
	}

	// Add ultrasonics array desc.
	sUltrasonicsArrayRecordList.emplace_back(
	EvsUltrasonicsArray::GetMockArrayDesc("front_array"));
	}


	// Methods from ::android::hardware::automotive::evs::V1_0::IEvsEnumerator follow.
	Return<void> EvsEnumerator::getCameraList(getCameraList_cb _hidl_cb) {
	ALOGD("getCameraList");

	const unsigned numCameras = sCameraList.size();

	// Build up a packed array of CameraDesc for return
	// NOTE: Only has to live until the callback returns
	std::vector<CameraDesc_1_0> descriptions;
	descriptions.reserve(numCameras);
	for (const auto& cam : sCameraList) {
	descriptions.push_back( cam.desc.v1 );
	}

	// Encapsulate our camera descriptions in the HIDL vec type
	hidl_vec<CameraDesc_1_0> hidlCameras(descriptions);

	// Send back the results
	ALOGD("reporting %zu cameras available", hidlCameras.size());
	_hidl_cb(hidlCameras);

	// HIDL convention says we return Void if we sent our result back via callback
	return Void();
	}


	Return<sp<IEvsCamera_1_0>> EvsEnumerator::openCamera(const hidl_string& cameraId) {
	ALOGD("openCamera");

	// Find the named camera
	CameraRecord *pRecord = nullptr;
	for (auto &&cam : sCameraList) {
	if (cam.desc.v1.cameraId == cameraId) {
	// Found a match!
	pRecord = &cam;
	break;
	}
	}

	// Is this a recognized camera id?
	if (!pRecord) {
	ALOGE("Requested camera %s not found", cameraId.c_str());
	return nullptr;
	}

	// Has this camera already been instantiated by another caller?
	sp<EvsCamera> pActiveCamera = pRecord->activeInstance.promote();
	if (pActiveCamera != nullptr) {
	ALOGW("Killing previous camera because of new caller");
	closeCamera(pActiveCamera);
	}

	// Construct a camera instance for the caller
	if (sConfigManager == nullptr) {
	pActiveCamera = EvsCamera::Create(cameraId.c_str());
	} else {
	pActiveCamera = EvsCamera::Create(cameraId.c_str(),
	sConfigManager->getCameraInfo(cameraId));
	}
	pRecord->activeInstance = pActiveCamera;
	if (pActiveCamera == nullptr) {
	ALOGE("Failed to allocate new EvsCamera object for %s\n", cameraId.c_str());
	}

	return pActiveCamera;
	}


	Return<void> EvsEnumerator::closeCamera(const ::android::sp<IEvsCamera_1_0>& pCamera) {
	ALOGD("closeCamera");

	auto pCamera_1_1 = IEvsCamera_1_1::castFrom(pCamera).withDefault(nullptr);
	if (pCamera_1_1 == nullptr) {
	ALOGE("Ignoring call to closeCamera with null camera ptr");
	return Void();
	}

	// Get the camera id so we can find it in our list
	std::string cameraId;
	pCamera_1_1->getCameraInfo_1_1([&cameraId](CameraDesc desc) {
	cameraId = desc.v1.cameraId;
	}
	);

	// Find the named camera
	CameraRecord *pRecord = nullptr;
	for (auto &&cam : sCameraList) {
	if (cam.desc.v1.cameraId == cameraId) {
	// Found a match!
	pRecord = &cam;
	break;
	}
	}

	// Is the display being destroyed actually the one we think is active?
	if (!pRecord) {
	ALOGE("Asked to close a camera who's name isn't recognized");
	} else {
	sp<EvsCamera> pActiveCamera = pRecord->activeInstance.promote();

	if (pActiveCamera == nullptr) {
	ALOGE("Somehow a camera is being destroyed when the enumerator didn't know one existed");
	} else if (pActiveCamera != pCamera_1_1) {
	// This can happen if the camera was aggressively reopened, orphaning this previous instance
	ALOGW("Ignoring close of previously orphaned camera - why did a client steal?");
	} else {
	// Drop the active camera
	pActiveCamera->forceShutdown();
	pRecord->activeInstance = nullptr;
	}
	}

	return Void();
	}


	Return<sp<IEvsDisplay_1_0>> EvsEnumerator::openDisplay() {
	ALOGD("openDisplay");

	// If we already have a display active, then we need to shut it down so we can
	// give exclusive access to the new caller.
	sp<EvsDisplay> pActiveDisplay = sActiveDisplay.promote();
	if (pActiveDisplay != nullptr) {
	ALOGW("Killing previous display because of new caller");
	closeDisplay(pActiveDisplay);
	}

	// Create a new display interface and return it
	pActiveDisplay = new EvsDisplay();
	sActiveDisplay = pActiveDisplay;

	ALOGD("Returning new EvsDisplay object %p", pActiveDisplay.get());
	return pActiveDisplay;
	}


	Return<void> EvsEnumerator::getDisplayIdList(getDisplayIdList_cb _list_cb) {
	hidl_vec<uint8_t> ids;

	ids.resize(sDisplayPortList.size());
	unsigned i = 0;
	for (const auto& [port, id] : sDisplayPortList) {
	ids[i++] = port;
	}

	_list_cb(ids);
	return Void();
	}


	Return<sp<IEvsDisplay>> EvsEnumerator::openDisplay_1_1(uint8_t port) {
	ALOGD("%s", __FUNCTION__);

	// If we already have a display active, then we need to shut it down so we can
	// give exclusive access to the new caller.
	sp<EvsDisplay> pActiveDisplay = sActiveDisplay.promote();
	if (pActiveDisplay != nullptr) {
	ALOGW("Killing previous display because of new caller");
	closeDisplay(pActiveDisplay);
	}

	// Create a new display interface and return it
	pActiveDisplay = new EvsDisplay(sDisplayProxyService, sDisplayPortList[port]);
	sActiveDisplay = pActiveDisplay;

	ALOGD("Returning new EvsDisplay object %p", pActiveDisplay.get());
	return pActiveDisplay;
	}



	Return<void> EvsEnumerator::closeDisplay(const ::android::sp<IEvsDisplay_1_0>& pDisplay) {
	ALOGD("closeDisplay");

	// Do we still have a display object we think should be active?
	sp<EvsDisplay> pActiveDisplay = sActiveDisplay.promote();
	if (pActiveDisplay == nullptr) {
	ALOGE("Somehow a display is being destroyed when the enumerator didn't know one existed");
	} else if (sActiveDisplay != pDisplay) {
	ALOGW("Ignoring close of previously orphaned display - why did a client steal?");
	} else {
	// Drop the active display
	pActiveDisplay->forceShutdown();
	sActiveDisplay = nullptr;
	}

	return Void();
	}


	Return<DisplayState> EvsEnumerator::getDisplayState() {
	ALOGD("getDisplayState");

	// Do we still have a display object we think should be active?
	sp<IEvsDisplay> pActiveDisplay = sActiveDisplay.promote();
	if (pActiveDisplay != nullptr) {
	return pActiveDisplay->getDisplayState();
	} else {
	return DisplayState::NOT_OPEN;
	}
	}


	// Methods from ::android::hardware::automotive::evs::V1_1::IEvsEnumerator follow.
	Return<void> EvsEnumerator::getCameraList_1_1(getCameraList_1_1_cb _hidl_cb) {
	ALOGD("getCameraList");

	const unsigned numCameras = sCameraList.size();

	// Build up a packed array of CameraDesc for return
	// NOTE: Only has to live until the callback returns
	std::vector<CameraDesc_1_1> descriptions;
	descriptions.reserve(numCameras);
	for (const auto& cam : sCameraList) {
	descriptions.push_back( cam.desc );
	}

	// Encapsulate our camera descriptions in the HIDL vec type
	hidl_vec<CameraDesc_1_1> hidlCameras(descriptions);

	// Send back the results
	ALOGD("reporting %zu cameras available", hidlCameras.size());
	_hidl_cb(hidlCameras);

	// HIDL convention says we return Void if we sent our result back via callback
	return Void();
	}

	Return<sp<IEvsCamera_1_1>>
	EvsEnumerator::openCamera_1_1(const hidl_string& cameraId,
	const Stream& streamCfg) {
	// Find the named camera
	CameraRecord *pRecord = nullptr;
	for (auto &&cam : sCameraList) {
	if (cam.desc.v1.cameraId == cameraId) {
	// Found a match!
	pRecord = &cam;
	break;
	}
	}

	// Is this a recognized camera id?
	if (!pRecord) {
	ALOGE("Requested camera %s not found", cameraId.c_str());
	return nullptr;
	}

	// Has this camera already been instantiated by another caller?
	sp<EvsCamera> pActiveCamera = pRecord->activeInstance.promote();
	if (pActiveCamera != nullptr) {
	ALOGW("Killing previous camera because of new caller");
	closeCamera(pActiveCamera);
	}

	// Construct a camera instance for the caller
	if (sConfigManager == nullptr) {
	pActiveCamera = EvsCamera::Create(cameraId.c_str());
	} else {
	pActiveCamera = EvsCamera::Create(cameraId.c_str(),
	sConfigManager->getCameraInfo(cameraId),
	&streamCfg);
	}

	pRecord->activeInstance = pActiveCamera;
	if (pActiveCamera == nullptr) {
	ALOGE("Failed to allocate new EvsCamera object for %s\n", cameraId.c_str());
	}

	return pActiveCamera;
	}


	EvsEnumerator::CameraRecord* EvsEnumerator::findCameraById(const std::string& cameraId) {
	// Find the named camera
	CameraRecord *pRecord = nullptr;
	for (auto &&cam : sCameraList) {
	if (cam.desc.v1.cameraId == cameraId) {
	// Found a match!
	pRecord = &cam;
	break;
	}
	}

	return pRecord;
	}

	EvsEnumerator::UltrasonicsArrayRecord* EvsEnumerator::findUltrasonicsArrayById(
	const std::string& ultrasonicsArrayId) {
	auto recordIt = std::find_if(
	sUltrasonicsArrayRecordList.begin(), sUltrasonicsArrayRecordList.end(),
	[&ultrasonicsArrayId](const UltrasonicsArrayRecord& record) {
	return ultrasonicsArrayId == record.desc.ultrasonicsArrayId;});

	return (recordIt != sUltrasonicsArrayRecordList.end()) ? &*recordIt : nullptr;
	}

	Return<void> EvsEnumerator::getUltrasonicsArrayList(getUltrasonicsArrayList_cb _hidl_cb) {
	hidl_vec<UltrasonicsArrayDesc> desc;
	desc.resize(sUltrasonicsArrayRecordList.size());

	// Copy over desc from sUltrasonicsArrayRecordList.
	for (auto p = std::make_pair(sUltrasonicsArrayRecordList.begin(), desc.begin());
	p.first != sUltrasonicsArrayRecordList.end(); p.first++, p.second++) {
	*p.second = p.first->desc;
	}

	// Send back the results
	ALOGD("reporting %zu ultrasonics arrays available", desc.size());
	_hidl_cb(desc);

	// HIDL convention says we return Void if we sent our result back via callback
	return Void();
	}

	Return<sp<IEvsUltrasonicsArray>> EvsEnumerator::openUltrasonicsArray(
	const hidl_string& ultrasonicsArrayId) {
	// Find the named ultrasonic array.
	UltrasonicsArrayRecord* pRecord = findUltrasonicsArrayById(ultrasonicsArrayId);

	// Is this a recognized ultrasonic array id?
	if (!pRecord) {
	ALOGE("Requested ultrasonics array %s not found", ultrasonicsArrayId.c_str());
	return nullptr;
	}

	// Has this ultrasonic array already been instantiated by another caller?
	sp<EvsUltrasonicsArray> pActiveUltrasonicsArray = pRecord->activeInstance.promote();
	if (pActiveUltrasonicsArray != nullptr) {
	ALOGW("Killing previous ultrasonics array because of new caller");
	closeUltrasonicsArray(pActiveUltrasonicsArray);
	}

	// Construct a ultrasonic array instance for the caller
	pActiveUltrasonicsArray = EvsUltrasonicsArray::Create(ultrasonicsArrayId.c_str());
	pRecord->activeInstance = pActiveUltrasonicsArray;
	if (pActiveUltrasonicsArray == nullptr) {
	ALOGE("Failed to allocate new EvsUltrasonicsArray object for %s\n",
	ultrasonicsArrayId.c_str());
	}

	return pActiveUltrasonicsArray;
	}

	Return<void> EvsEnumerator::closeUltrasonicsArray(
	const sp<IEvsUltrasonicsArray>& pEvsUltrasonicsArray) {

	if (pEvsUltrasonicsArray.get() == nullptr) {
	ALOGE("Ignoring call to closeUltrasonicsArray with null ultrasonics array");
	return Void();
	}

	// Get the ultrasonics array id so we can find it in our list.
	std::string ultrasonicsArrayId;
	pEvsUltrasonicsArray->getUltrasonicArrayInfo([&ultrasonicsArrayId](UltrasonicsArrayDesc desc) {
	ultrasonicsArrayId.assign(desc.ultrasonicsArrayId);
	});

	// Find the named ultrasonics array
	UltrasonicsArrayRecord* pRecord = findUltrasonicsArrayById(ultrasonicsArrayId);
	if (!pRecord) {
	ALOGE("Asked to close a ultrasonics array whose name isnt not found");
	return Void();
	}

	sp<EvsUltrasonicsArray> pActiveUltrasonicsArray = pRecord->activeInstance.promote();

	if (pActiveUltrasonicsArray.get() == nullptr) {
	ALOGE("Somehow a ultrasonics array is being destroyed when the enumerator didn't know "
	"one existed");
	} else if (pActiveUltrasonicsArray != pEvsUltrasonicsArray) {
	// This can happen if the ultrasonics array was aggressively reopened,
	// orphaning this previous instance
	ALOGW("Ignoring close of previously orphaned ultrasonics array - why did a client steal?");
	} else {
	// Drop the active ultrasonics array
	pActiveUltrasonicsArray->forceShutdown();
	pRecord->activeInstance = nullptr;
	}

	return Void();
	}

	} // namespace implementation
	} // namespace V1_1
	} // namespace evs
	} // namespace automotive
	} // namespace hardware
	} // namespace android