libcamera: v4l2_controls: Replace V4L2ControlInfo with V4L2ControlRange

The V4L2ControlInfo class only stores a ControlRange. Make it inherit
from ControlRange to provide a convenience constructor from a struct
v4l2_query_ext_ctrl and rename it to V4L2ControlRange.

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

6 files changed, 44 insertions, 63 deletions

diff --git a/src/ipa/rkisp1/rkisp1.cpp b/src/ipa/rkisp1/rkisp1.cpp
index 13059d99..d64c334c 100644
--- a/src/ipa/rkisp1/rkisp1.cpp
+++ b/src/ipa/rkisp1/rkisp1.cpp
@@ -83,12 +83,12 @@ void IPARkISP1::configure(const std::map<unsigned int, IPAStream> &streamConfig,
 
 	autoExposure_ = true;
 
-	minExposure_ = std::max<uint32_t>(itExp->second.range().min().get<int32_t>(), 1);
-	maxExposure_ = itExp->second.range().max().get<int32_t>();
+	minExposure_ = std::max<uint32_t>(itExp->second.min().get<int32_t>(), 1);
+	maxExposure_ = itExp->second.max().get<int32_t>();
 	exposure_ = minExposure_;
 
-	minGain_ = std::max<uint32_t>(itGain->second.range().min().get<int32_t>(), 1);
-	maxGain_ = itGain->second.range().max().get<int32_t>();
+	minGain_ = std::max<uint32_t>(itGain->second.min().get<int32_t>(), 1);
+	maxGain_ = itGain->second.max().get<int32_t>();
 	gain_ = minGain_;
 
 	LOG(IPARkISP1, Info)
diff --git a/src/libcamera/include/v4l2_controls.h b/src/libcamera/include/v4l2_controls.h
index ca721750..74156982 100644
--- a/src/libcamera/include/v4l2_controls.h
+++ b/src/libcamera/include/v4l2_controls.h
@@ -25,38 +25,33 @@ public:
 	V4L2ControlId(const struct v4l2_query_ext_ctrl &ctrl);
 };
 
-class V4L2ControlInfo
+class V4L2ControlRange : public ControlRange
 {
 public:
-	V4L2ControlInfo(const struct v4l2_query_ext_ctrl &ctrl);
-
-	const ControlRange &range() const { return range_; }
-
-private:
-	ControlRange range_;
+	V4L2ControlRange(const struct v4l2_query_ext_ctrl &ctrl);
 };
 
-class V4L2ControlInfoMap : private std::map<const ControlId *, V4L2ControlInfo>
+class V4L2ControlInfoMap : private std::map<const ControlId *, V4L2ControlRange>
 {
 public:
-	V4L2ControlInfoMap &operator=(std::map<const ControlId *, V4L2ControlInfo> &&info);
-
-	using std::map<const ControlId *, V4L2ControlInfo>::key_type;
-	using std::map<const ControlId *, V4L2ControlInfo>::mapped_type;
-	using std::map<const ControlId *, V4L2ControlInfo>::value_type;
-	using std::map<const ControlId *, V4L2ControlInfo>::size_type;
-	using std::map<const ControlId *, V4L2ControlInfo>::iterator;
-	using std::map<const ControlId *, V4L2ControlInfo>::const_iterator;
-
-	using std::map<const ControlId *, V4L2ControlInfo>::begin;
-	using std::map<const ControlId *, V4L2ControlInfo>::cbegin;
-	using std::map<const ControlId *, V4L2ControlInfo>::end;
-	using std::map<const ControlId *, V4L2ControlInfo>::cend;
-	using std::map<const ControlId *, V4L2ControlInfo>::at;
-	using std::map<const ControlId *, V4L2ControlInfo>::empty;
-	using std::map<const ControlId *, V4L2ControlInfo>::size;
-	using std::map<const ControlId *, V4L2ControlInfo>::count;
-	using std::map<const ControlId *, V4L2ControlInfo>::find;
+	V4L2ControlInfoMap &operator=(std::map<const ControlId *, V4L2ControlRange> &&info);
+
+	using std::map<const ControlId *, V4L2ControlRange>::key_type;
+	using std::map<const ControlId *, V4L2ControlRange>::mapped_type;
+	using std::map<const ControlId *, V4L2ControlRange>::value_type;
+	using std::map<const ControlId *, V4L2ControlRange>::size_type;
+	using std::map<const ControlId *, V4L2ControlRange>::iterator;
+	using std::map<const ControlId *, V4L2ControlRange>::const_iterator;
+
+	using std::map<const ControlId *, V4L2ControlRange>::begin;
+	using std::map<const ControlId *, V4L2ControlRange>::cbegin;
+	using std::map<const ControlId *, V4L2ControlRange>::end;
+	using std::map<const ControlId *, V4L2ControlRange>::cend;
+	using std::map<const ControlId *, V4L2ControlRange>::at;
+	using std::map<const ControlId *, V4L2ControlRange>::empty;
+	using std::map<const ControlId *, V4L2ControlRange>::size;
+	using std::map<const ControlId *, V4L2ControlRange>::count;
+	using std::map<const ControlId *, V4L2ControlRange>::find;
 
 	mapped_type &at(unsigned int key);
 	const mapped_type &at(unsigned int key) const;
diff --git a/src/libcamera/pipeline/uvcvideo.cpp b/src/libcamera/pipeline/uvcvideo.cpp
index 4d76b5fd..7356585b 100644
--- a/src/libcamera/pipeline/uvcvideo.cpp
+++ b/src/libcamera/pipeline/uvcvideo.cpp
@@ -337,7 +337,7 @@ int UVCCameraData::init(MediaEntity *entity)
 	/* Initialise the supported controls. */
 	const V4L2ControlInfoMap &controls = video_->controls();
 	for (const auto &ctrl : controls) {
-		const V4L2ControlInfo &info = ctrl.second;
+		const V4L2ControlRange &range = ctrl.second;
 		const ControlId *id;
 
 		switch (ctrl.first->id()) {
@@ -362,7 +362,7 @@ int UVCCameraData::init(MediaEntity *entity)
 
 		controlInfo_.emplace(std::piecewise_construct,
 				     std::forward_as_tuple(id),
-				     std::forward_as_tuple(info.range()));
+				     std::forward_as_tuple(range));
 	}
 
 	return 0;
diff --git a/src/libcamera/pipeline/vimc.cpp b/src/libcamera/pipeline/vimc.cpp
index 78c0fe5a..87e7e54e 100644
--- a/src/libcamera/pipeline/vimc.cpp
+++ b/src/libcamera/pipeline/vimc.cpp
@@ -413,7 +413,7 @@ int VimcCameraData::init(MediaDevice *media)
 	/* Initialise the supported controls. */
 	const V4L2ControlInfoMap &controls = sensor_->controls();
 	for (const auto &ctrl : controls) {
-		const V4L2ControlInfo &info = ctrl.second;
+		const V4L2ControlRange &range = ctrl.second;
 		const ControlId *id;
 
 		switch (ctrl.first->id()) {
@@ -432,7 +432,7 @@ int VimcCameraData::init(MediaDevice *media)
 
 		controlInfo_.emplace(std::piecewise_construct,
 				     std::forward_as_tuple(id),
-				     std::forward_as_tuple(info.range()));
+				     std::forward_as_tuple(range));
 	}
 
 	return 0;
diff --git a/src/libcamera/v4l2_controls.cpp b/src/libcamera/v4l2_controls.cpp
index 9a5e4830..f2ac60de 100644
--- a/src/libcamera/v4l2_controls.cpp
+++ b/src/libcamera/v4l2_controls.cpp
@@ -104,45 +104,31 @@ V4L2ControlId::V4L2ControlId(const struct v4l2_query_ext_ctrl &ctrl)
 }
 
 /**
- * \class V4L2ControlInfo
- * \brief Information on a V4L2 control
+ * \class V4L2ControlRange
+ * \brief Convenience specialisation of ControlRange for V4L2 controls
  *
- * The V4L2ControlInfo class represents all the information related to a V4L2
- * control, such as its ID, its type, its user-readable name and the expected
- * size of its value data.
- *
- * V4L2ControlInfo instances are created by inspecting the fieldS of a struct
- * v4l2_query_ext_ctrl structure, after it has been filled by the device driver
- * as a consequence of a VIDIOC_QUERY_EXT_CTRL ioctl call.
- *
- * This class does not contain the control value, but only static information on
- * the control, which shall be cached by the caller at initialisation time or
- * the first time the control information is accessed.
+ * The V4L2ControlRange class is a specialisation of the ControlRange for V4L2
+ * controls. It offers a convenience constructor from a struct
+ * v4l2_query_ext_ctrl, and is otherwise equivalent to the ControlRange class.
  */
 
 /**
- * \brief Construct a V4L2ControlInfo from a struct v4l2_query_ext_ctrl
+ * \brief Construct a V4L2ControlRange from a struct v4l2_query_ext_ctrl
  * \param[in] ctrl The struct v4l2_query_ext_ctrl as returned by the kernel
  */
-V4L2ControlInfo::V4L2ControlInfo(const struct v4l2_query_ext_ctrl &ctrl)
+V4L2ControlRange::V4L2ControlRange(const struct v4l2_query_ext_ctrl &ctrl)
 {
 	if (ctrl.type == V4L2_CTRL_TYPE_INTEGER64)
-		range_ = ControlRange(static_cast<int64_t>(ctrl.minimum),
-				      static_cast<int64_t>(ctrl.maximum));
+		ControlRange::operator=(ControlRange(static_cast<int64_t>(ctrl.minimum),
+						     static_cast<int64_t>(ctrl.maximum)));
 	else
-		range_ = ControlRange(static_cast<int32_t>(ctrl.minimum),
-				      static_cast<int32_t>(ctrl.maximum));
+		ControlRange::operator=(ControlRange(static_cast<int32_t>(ctrl.minimum),
+						     static_cast<int32_t>(ctrl.maximum)));
 }
 
 /**
- * \fn V4L2ControlInfo::range()
- * \brief Retrieve the control value range
- * \return The V4L2 control value range
- */
-
-/**
  * \class V4L2ControlInfoMap
- * \brief A map of controlID to V4L2ControlInfo
+ * \brief A map of controlID to V4L2ControlRange
  */
 
 /**
@@ -156,9 +142,9 @@ V4L2ControlInfo::V4L2ControlInfo(const struct v4l2_query_ext_ctrl &ctrl)
  *
  * \return The populated V4L2ControlInfoMap
  */
-V4L2ControlInfoMap &V4L2ControlInfoMap::operator=(std::map<const ControlId *, V4L2ControlInfo> &&info)
+V4L2ControlInfoMap &V4L2ControlInfoMap::operator=(std::map<const ControlId *, V4L2ControlRange> &&info)
 {
-	std::map<const ControlId *, V4L2ControlInfo>::operator=(std::move(info));
+	std::map<const ControlId *, V4L2ControlRange>::operator=(std::move(info));
 
 	idmap_.clear();
 	for (const auto &ctrl : *this)
diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp
index 4bb7d595..133f8abc 100644
--- a/src/libcamera/v4l2_device.cpp
+++ b/src/libcamera/v4l2_device.cpp
@@ -342,7 +342,7 @@ int V4L2Device::ioctl(unsigned long request, void *argp)
  */
 void V4L2Device::listControls()
 {
-	std::map<const ControlId *, V4L2ControlInfo> ctrls;
+	std::map<const ControlId *, V4L2ControlRange> ctrls;
 	struct v4l2_query_ext_ctrl ctrl = {};
 
 	/* \todo Add support for menu and compound controls. */