libcamera: controls: Add a set of initial controls

Add an initial set of controls to demonstrate how controls are defined.

Proper documentation for each control is missing.

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

src/libcamera/controls.cpp

@@ -186,6 +186,48 @@ std::string ControlValue::toString() const
  * \brief Numerical control ID
  */
 
+/**
+ * \var AwbEnable
+ * ControlType: Bool
+ *
+ * Enables or disables the AWB. See also \a libcamera::ControlId::ManualGain
+ */
+
+/**
+ * \var Brightness
+ * ControlType: Integer
+ *
+ * Specify a fixed brightness parameter.
+ */
+
+/**
+ * \var Contrast
+ * ControlType: Integer
+ *
+ * Specify a fixed constrast parameter.
+ */
+
+/**
+ * \var Saturation
+ * ControlType: Integer
+ *
+ * Specify a fixed saturation parameter.
+ */
+
+/**
+ * \var ManualExposure
+ * ControlType: Integer
+ *
+ * Specify a fixed exposure time in milli-seconds
+ */
+
+/**
+ * \var ManualGain
+ * ControlType: Integer
+ *
+ * Specify a fixed gain parameter
+ */
+
 /**
  * \struct ControlIdentifier
  * \brief Describe a ControlId with control specific constant meta-data