libcamera: controls: Introduce control-related data types

Add a set of data types to support controls:

- ControlValue stores a control type and value in a generic way
- ControlId enumerates all the control identifiers
- ControlIdentifier declares the types of a control and map their names
- ControlInfo stores runtime information for controls
- ControlList contains a set of control info and value pairs

The control definitions map is generated from the controls documentation
to ensure that the two will always be synchronised.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

1 files changed, 35 insertions, 0 deletions

diff --git a/include/libcamera/control_ids.h b/include/libcamera/control_ids.h
new file mode 100644
index 00000000..d0e700da
--- /dev/null
+++ b/include/libcamera/control_ids.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * control_ids.h : Control ID list
+ */
+
+#ifndef __LIBCAMERA_CONTROL_IDS_H__
+#define __LIBCAMERA_CONTROL_IDS_H__
+
+#include <functional>
+
+namespace libcamera {
+
+enum ControlId {
+};
+
+} /* namespace libcamera */
+
+namespace std {
+
+template<>
+struct hash<libcamera::ControlId> {
+	using argument_type = libcamera::ControlId;
+	using result_type = std::size_t;
+
+	result_type operator()(const argument_type &key) const noexcept
+	{
+		return std::hash<std::underlying_type<argument_type>::type>()(key);
+	}
+};
+
+} /* namespace std */
+
+#endif // __LIBCAMERA_CONTROL_IDS_H__