android: camera_device: Get properties from configuration

Open the HAL configuration file in the Camera HAL manager and get
the camera properties for each created CameraDevice and initialize it
with them.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>

src/android/camera_device.cpp

@@ -6,6 +6,7 @@
  */
 
 #include "camera_device.h"
+#include "camera_hal_config.h"
 #include "camera_ops.h"
 #include "post_processor.h"
 
@@ -440,12 +441,25 @@ std::unique_ptr<CameraDevice> CameraDevice::create(unsigned int id,
 }
 
 /*
- * Initialize the camera static information.
+ * Initialize the camera static information retrieved from the
+ * Camera::properties or from the cameraConfigData.
+ *
+ * cameraConfigData is optional for external camera devices and can be
+ * nullptr.
+ *
  * This method is called before the camera device is opened.
  */
-int CameraDevice::initialize()
+int CameraDevice::initialize(const CameraConfigData *cameraConfigData)
 {
-	/* Initialize orientation and facing side of the camera. */
+	/*
+	 * Initialize orientation and facing side of the camera.
+	 *
+	 * If the libcamera::Camera provides those information as retrieved
+	 * from firmware use them, otherwise fallback to values parsed from
+	 * the configuration file. If the configuration file is not available
+	 * the camera is external so its location and rotation can be safely
+	 * defaulted.
+	 */
 	const ControlList &properties = camera_->properties();
 
 	if (properties.contains(properties::Location)) {
@@ -461,12 +475,22 @@ int CameraDevice::initialize()
 			facing_ = CAMERA_FACING_EXTERNAL;
 			break;
 		}
+
+		if (cameraConfigData && cameraConfigData->facing != -1 &&
+		    facing_ != cameraConfigData->facing) {
+			LOG(HAL, Warning)
+				<< "Camera location does not match"
+				<< " configuration file. Using " << facing_;
+		}
+	} else if (cameraConfigData) {
+		if (cameraConfigData->facing == -1) {
+			LOG(HAL, Error)
+				<< "Camera facing not in configuration file";
+			return -EINVAL;
+		}
+		facing_ = cameraConfigData->facing;
 	} else {
-		/*
-		 * \todo Retrieve the camera location from configuration file
-		 * if not available from the library.
-		 */
-		facing_ = CAMERA_FACING_FRONT;
+		facing_ = CAMERA_FACING_EXTERNAL;
 	}
 
 	/*
@@ -480,8 +504,24 @@ int CameraDevice::initialize()
 	if (properties.contains(properties::Rotation)) {
 		int rotation = properties.get(properties::Rotation);
 		orientation_ = (360 - rotation) % 360;
+		if (cameraConfigData && cameraConfigData->rotation != -1 &&
+		    orientation_ != cameraConfigData->rotation) {
+			LOG(HAL, Warning)
+				<< "Camera orientation does not match"
+				<< " configuration file. Using " << orientation_;
+		}
+	} else if (cameraConfigData) {
+		if (cameraConfigData->rotation == -1) {
+			LOG(HAL, Error)
+				<< "Camera rotation not in configuration file";
+			return -EINVAL;
+		}
+		orientation_ = cameraConfigData->rotation;
+	} else {
+		orientation_ = 0;
 	}
 
+	/* Acquire the camera and initialize available stream configurations. */
 	int ret = camera_->acquire();
 	if (ret) {
 		LOG(HAL, Error) << "Failed to temporarily acquire the camera";

src/android/camera_device.h

@@ -30,6 +30,7 @@
 #include "camera_worker.h"
 #include "jpeg/encoder.h"
 
+struct CameraConfigData;
 class CameraDevice : protected libcamera::Loggable
 {
 public:
@@ -37,7 +38,7 @@ public:
 						    std::shared_ptr<libcamera::Camera> cam);
 	~CameraDevice();
 
-	int initialize();
+	int initialize(const CameraConfigData *cameraConfigData);
 
 	int open(const hw_module_t *hardwareModule);
 	void close();

src/android/camera_hal_manager.cpp

@@ -41,6 +41,15 @@ int CameraHalManager::init()
 {
 	cameraManager_ = std::make_unique<CameraManager>();
 
+	/*
+	 * If the configuration file is not available the HAL only supports
+	 * external cameras. If it exists but it's not valid then error out.
+	 */
+	if (halConfig_.exists() && !halConfig_.isValid()) {
+		LOG(HAL, Error) << "HAL configuration file is not valid";
+		return -EINVAL;
+	}
+
 	/* Support camera hotplug. */
 	cameraManager_->cameraAdded.connect(this, &CameraHalManager::cameraAdded);
 	cameraManager_->cameraRemoved.connect(this, &CameraHalManager::cameraRemoved);
@@ -100,6 +109,8 @@ void CameraHalManager::cameraAdded(std::shared_ptr<Camera> cam)
 	auto iter = cameraIdsMap_.find(cam->id());
 	if (iter != cameraIdsMap_.end()) {
 		id = iter->second;
+		if (id >= firstExternalCameraId_)
+			isCameraExternal = true;
 	} else {
 		isCameraNew = true;
 
@@ -117,7 +128,27 @@ void CameraHalManager::cameraAdded(std::shared_ptr<Camera> cam)
 
 	/* Create a CameraDevice instance to wrap the libcamera Camera. */
 	std::unique_ptr<CameraDevice> camera = CameraDevice::create(id, cam);
-	int ret = camera->initialize();
+
+	/*
+	 * The configuration file must be valid, and contain a corresponding
+	 * entry for internal cameras. External cameras can be initialized
+	 * without configuration file.
+	 */
+	if (!isCameraExternal && !halConfig_.exists()) {
+		LOG(HAL, Error)
+			<< "HAL configuration file is mandatory for internal cameras";
+		return;
+	}
+
+	const CameraConfigData *cameraConfigData = halConfig_.cameraConfigData(cam->id());
+	if (!isCameraExternal && !cameraConfigData) {
+		LOG(HAL, Error)
+			<< "HAL configuration entry for internal camera "
+			<< cam->id() << " is missing";
+		return;
+	}
+
+	int ret = camera->initialize(cameraConfigData);
 	if (ret) {
 		LOG(HAL, Error) << "Failed to initialize camera: " << cam->id();
 		return;

src/android/camera_hal_manager.h

@@ -19,6 +19,8 @@
 
 #include <libcamera/camera_manager.h>
 
+#include "camera_hal_config.h"
+
 class CameraDevice;
 
 class CameraHalManager
@@ -50,6 +52,7 @@ private:
 	CameraDevice *cameraDeviceFromHalId(unsigned int id);
 
 	std::unique_ptr<libcamera::CameraManager> cameraManager_;
+	CameraHalConfig halConfig_;
 
 	const camera_module_callbacks_t *callbacks_;
 	std::vector<std::unique_ptr<CameraDevice>> cameras_;