android: Add CameraHalConfig class

Add a CameraHalConfig class to the Android Camera3 HAL layer.

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_hal_config.h

@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Google Inc.
+ *
+ * camera_hal_config.h - Camera HAL configuration file manager
+ */
+#ifndef __ANDROID_CAMERA_HAL_CONFIG_H__
+#define __ANDROID_CAMERA_HAL_CONFIG_H__
+
+#include <filesystem>
+#include <map>
+#include <string>
+
+#include <libcamera/class.h>
+
+struct CameraConfigData {
+	int facing = -1;
+	int rotation = -1;
+};
+
+class CameraHalConfig final : public libcamera::Extensible
+{
+	LIBCAMERA_DECLARE_PRIVATE()
+
+public:
+	CameraHalConfig();
+
+	bool exists() const { return exists_; }
+	bool isValid() const { return valid_; }
+
+	const CameraConfigData *cameraConfigData(const std::string &cameraId) const;
+
+private:
+	bool exists_;
+	bool valid_;
+	std::map<std::string, CameraConfigData> cameras_;
+
+	int parseConfigurationFile();
+};
+#endif /* __ANDROID_CAMERA_HAL_CONFIG_H__ */