[libcamera-devel] [PATCH 9/9] libcamera: v4l2_controls: Add control validator

[Laurent Pinchart]

Add a ControlValidator specialisation that validates controls based on a
V4L2 device.

Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 src/libcamera/include/v4l2_controls.h | 14 ++++++++++++
 src/libcamera/v4l2_controls.cpp       | 33 +++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/src/libcamera/include/v4l2_controls.h b/src/libcamera/include/v4l2_controls.h
index 133ab9ec208b..5fd92e3ac4e5 100644
--- a/src/libcamera/include/v4l2_controls.h
+++ b/src/libcamera/include/v4l2_controls.h
@@ -17,6 +17,8 @@
 
 #include <libcamera/controls.h>
 
+#include "control_validator.h"
+
 namespace libcamera {
 
 class V4L2ControlId : public ControlId
@@ -57,6 +59,18 @@ private:
 	const V4L2ControlInfoMap &controls_;
 };
 
+class V4L2ControlValidator final : public ControlValidator
+{
+public:
+	V4L2ControlValidator(V4L2Device *device);
+
+	const std::string &name() const override;
+	bool validate(const ControlId &id) const override;
+
+private:
+	V4L2Device *dev_;
+};
+
 } /* namespace libcamera */
 
 #endif /* __LIBCAMERA_V4L2_CONTROLS_H__ */
diff --git a/src/libcamera/v4l2_controls.cpp b/src/libcamera/v4l2_controls.cpp
index d3f94709e821..498567ee0bf0 100644
--- a/src/libcamera/v4l2_controls.cpp
+++ b/src/libcamera/v4l2_controls.cpp
@@ -239,4 +239,37 @@ void V4L2ControlList::set(unsigned int id, const ControlValue &value)
 	ControlList::set(ctrl->second.id(), value);
 }
 
+/**
+ * \class V4L2ControlValidator
+ * \brief A control validator for V4L2Devoe instances
+ *
+ * This ControlValidator specialisation validates that controls exist in the
+ * V4L2Device associated with the validator.
+ */
+
+/**
+ * \brief Construst a V4L2ControlValidator for the V4L2 \a device
+ * \param[in] device The V4L2 device
+ */
+V4L2ControlValidator::V4L2ControlValidator(V4L2Device *device)
+	: dev_(device)
+{
+}
+
+const std::string &V4L2ControlValidator::name() const
+{
+	return dev_->deviceNode();
+}
+
+/**
+ * \brief Validate a control
+ * \param[in] id The control ID
+ * \return True if the control is valid, false otherwise
+ */
+bool V4L2ControlValidator::validate(const ControlId &id) const
+{
+	const V4L2ControlInfoMap &controls = dev_->controls();
+	return controls.find(id.id()) != controls.end();
+}
+
 } /* namespace libcamera */
-- 
Regards,

Laurent Pinchart