libcamera: device_enumerator: add DeviceInfo class

Provide a DeviceInfo class which holds all information from the initial
enumeration of a media device. Not all information available at a media
device is stored, only the information needed for a pipeline handler to
find a specific device.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/src/libcamera/include/device_enumerator.h b/src/libcamera/include/device_enumerator.h
new file mode 100644
index 00000000..ac40bafc
--- /dev/null
+++ b/src/libcamera/include/device_enumerator.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2018, Google Inc.
+ *
+ * device_enumerator.h - API to enumerate and find media devices
+ */
+#ifndef __LIBCAMERA_DEVICE_ENUMERATOR_H__
+#define __LIBCAMERA_DEVICE_ENUMERATOR_H__
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include <linux/media.h>
+
+namespace libcamera {
+
+class DeviceInfo
+{
+public:
+	DeviceInfo(const std::string &devnode, const struct media_device_info &info,
+		   const std::map<std::string, std::string> &entities);
+
+	int acquire();
+	void release();
+	bool busy() const;
+
+	const std::string &devnode() const;
+	const struct media_device_info &info() const;
+	std::vector<std::string> entities() const;
+
+	int lookup(const std::string &name, std::string &devnode) const;
+
+private:
+	bool acquired_;
+
+	std::string devnode_;
+	struct media_device_info info_;
+	std::map<std::string, std::string> entities_;
+};
+
+} /* namespace libcamera */
+
+#endif	/* __LIBCAMERA_DEVICE_ENUMERATOR_H__ */