libcamera: v4l2_device: Replace V4L2ControlList with ControlList

The V4L2Device class uses V4L2ControlList as a controls container for
the getControls() and setControls() operations. Having a distinct
container from ControlList will makes the IPA API more complex, as it
needs to explicitly transport both types of lists. This will become even
more painful when implementing serialisation and deserialisation.

To simplify the IPA API and ease the implementation of serialisation and
deserialisation, replace usage of V4L2ControlList with ControlList in
the V4L2Device (and thus CameraSensor) API. The V4L2ControlList class
becomes a thin wrapper around ControlList that slightly simplifies the
creation of control lists for V4L2 controls, and may be removed in the
future.

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

10 files changed, 107 insertions, 275 deletions

diff --git a/src/ipa/rkisp1/rkisp1.cpp b/src/ipa/rkisp1/rkisp1.cpp
index b0d23dd1..69ced840 100644
--- a/src/ipa/rkisp1/rkisp1.cpp
+++ b/src/ipa/rkisp1/rkisp1.cpp
@@ -49,6 +49,8 @@ private:
 
 	std::map<unsigned int, BufferMemory> bufferInfo_;
 
+	V4L2ControlInfoMap ctrls_;
+
 	/* Camera sensor controls. */
 	bool autoExposure_;
 	uint32_t exposure_;
@@ -65,16 +67,16 @@ void IPARkISP1::configure(const std::map<unsigned int, IPAStream> &streamConfig,
 	if (entityControls.empty())
 		return;
 
-	const V4L2ControlInfoMap &ctrls = entityControls.at(0);
+	ctrls_ = entityControls.at(0);
 
-	const auto itExp = ctrls.find(V4L2_CID_EXPOSURE);
-	if (itExp == ctrls.end()) {
+	const auto itExp = ctrls_.find(V4L2_CID_EXPOSURE);
+	if (itExp == ctrls_.end()) {
 		LOG(IPARkISP1, Error) << "Can't find exposure control";
 		return;
 	}
 
-	const auto itGain = ctrls.find(V4L2_CID_ANALOGUE_GAIN);
-	if (itGain == ctrls.end()) {
+	const auto itGain = ctrls_.find(V4L2_CID_ANALOGUE_GAIN);
+	if (itGain == ctrls_.end()) {
 		LOG(IPARkISP1, Error) << "Can't find gain control";
 		return;
 	}
@@ -210,9 +212,9 @@ void IPARkISP1::setControls(unsigned int frame)
 	IPAOperationData op;
 	op.operation = RKISP1_IPA_ACTION_V4L2_SET;
 
-	V4L2ControlList ctrls;
-	ctrls.add(V4L2_CID_EXPOSURE, exposure_);
-	ctrls.add(V4L2_CID_ANALOGUE_GAIN, gain_);
+	V4L2ControlList ctrls(ctrls_);
+	ctrls.set(V4L2_CID_EXPOSURE, static_cast<int32_t>(exposure_));
+	ctrls.set(V4L2_CID_ANALOGUE_GAIN, static_cast<int32_t>(gain_));
 	op.v4l2controls.push_back(ctrls);
 
 	queueFrameAction.emit(frame, op);
diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index a7670b44..9e8b44a2 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -279,7 +279,7 @@ const V4L2ControlInfoMap &CameraSensor::controls() const
  * \retval -EINVAL One of the control is not supported or not accessible
  * \retval i The index of the control that failed
  */
-int CameraSensor::getControls(V4L2ControlList *ctrls)
+int CameraSensor::getControls(ControlList *ctrls)
 {
 	return subdev_->getControls(ctrls);
 }
@@ -309,7 +309,7 @@ int CameraSensor::getControls(V4L2ControlList *ctrls)
  * \retval -EINVAL One of the control is not supported or not accessible
  * \retval i The index of the control that failed
  */
-int CameraSensor::setControls(V4L2ControlList *ctrls)
+int CameraSensor::setControls(ControlList *ctrls)
 {
 	return subdev_->setControls(ctrls);
 }
diff --git a/src/libcamera/include/camera_sensor.h b/src/libcamera/include/camera_sensor.h
index fe033fb3..f426e29b 100644
--- a/src/libcamera/include/camera_sensor.h
+++ b/src/libcamera/include/camera_sensor.h
@@ -13,11 +13,12 @@
 #include <libcamera/geometry.h>
 
 #include "log.h"
-#include "v4l2_controls.h"
 
 namespace libcamera {
 
+class ControlList;
 class MediaEntity;
+class V4L2ControlInfoMap;
 class V4L2Subdevice;
 
 struct V4L2SubdeviceFormat;
@@ -43,8 +44,8 @@ public:
 	int setFormat(V4L2SubdeviceFormat *format);
 
 	const V4L2ControlInfoMap &controls() const;
-	int getControls(V4L2ControlList *ctrls);
-	int setControls(V4L2ControlList *ctrls);
+	int getControls(ControlList *ctrls);
+	int setControls(ControlList *ctrls);
 
 protected:
 	std::string logPrefix() const;
diff --git a/src/libcamera/include/v4l2_controls.h b/src/libcamera/include/v4l2_controls.h
index 8990e755..89cc7448 100644
--- a/src/libcamera/include/v4l2_controls.h
+++ b/src/libcamera/include/v4l2_controls.h
@@ -13,7 +13,6 @@
 #include <string>
 #include <vector>
 
-#include <linux/v4l2-controls.h>
 #include <linux/videodev2.h>
 
 #include <libcamera/controls.h>
@@ -57,47 +56,20 @@ public:
 	using std::map<unsigned int, V4L2ControlInfo>::size;
 	using std::map<unsigned int, V4L2ControlInfo>::count;
 	using std::map<unsigned int, V4L2ControlInfo>::find;
-};
 
-class V4L2Control
-{
-public:
-	V4L2Control(unsigned int id, const ControlValue &value = ControlValue())
-		: id_(id), value_(value)
-	{
-	}
-
-	unsigned int id() const { return id_; }
-	const ControlValue &value() const { return value_; }
-	ControlValue &value() { return value_; }
+	const ControlIdMap &idmap() const { return idmap_; }
 
 private:
-	unsigned int id_;
-	ControlValue value_;
+	ControlIdMap idmap_;
 };
 
-class V4L2ControlList
+class V4L2ControlList : public ControlList
 {
 public:
-	using iterator = std::vector<V4L2Control>::iterator;
-	using const_iterator = std::vector<V4L2Control>::const_iterator;
-
-	iterator begin() { return controls_.begin(); }
-	const_iterator begin() const { return controls_.begin(); }
-	iterator end() { return controls_.end(); }
-	const_iterator end() const { return controls_.end(); }
-
-	bool empty() const { return controls_.empty(); }
-	std::size_t size() const { return controls_.size(); }
-
-	void clear() { controls_.clear(); }
-	void add(unsigned int id, int64_t value = 0);
-
-	V4L2Control *getByIndex(unsigned int index);
-	V4L2Control *operator[](unsigned int id);
-
-private:
-	std::vector<V4L2Control> controls_;
+	V4L2ControlList(const V4L2ControlInfoMap &info)
+		: ControlList(info.idmap())
+	{
+	}
 };
 
 } /* namespace libcamera */
diff --git a/src/libcamera/include/v4l2_device.h b/src/libcamera/include/v4l2_device.h
index 75a52c33..daa762d5 100644
--- a/src/libcamera/include/v4l2_device.h
+++ b/src/libcamera/include/v4l2_device.h
@@ -25,8 +25,8 @@ public:
 
 	const V4L2ControlInfoMap &controls() const { return controls_; }
 
-	int getControls(V4L2ControlList *ctrls);
-	int setControls(V4L2ControlList *ctrls);
+	int getControls(ControlList *ctrls);
+	int setControls(ControlList *ctrls);
 
 	const std::string &deviceNode() const { return deviceNode_; }
 
@@ -43,7 +43,7 @@ protected:
 
 private:
 	void listControls();
-	void updateControls(V4L2ControlList *ctrls,
+	void updateControls(ControlList *ctrls,
 			    const V4L2ControlInfo **controlInfo,
 			    const struct v4l2_ext_control *v4l2Ctrls,
 			    unsigned int count);
diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp
index 827906d5..9776b36b 100644
--- a/src/libcamera/pipeline/ipu3/ipu3.cpp
+++ b/src/libcamera/pipeline/ipu3/ipu3.cpp
@@ -199,6 +199,7 @@ class PipelineHandlerIPU3 : public PipelineHandler
 {
 public:
 	static constexpr unsigned int V4L2_CID_IPU3_PIPE_MODE = 0x009819c1;
+
 	enum IPU3PipeModes {
 		IPU3PipeModeVideo = 0,
 		IPU3PipeModeStillCapture = 1,
@@ -603,10 +604,10 @@ int PipelineHandlerIPU3::configure(Camera *camera, CameraConfiguration *c)
 		return ret;
 
 	/* Apply the "pipe_mode" control to the ImgU subdevice. */
-	V4L2ControlList ctrls;
-	ctrls.add(V4L2_CID_IPU3_PIPE_MODE, vfStream->active_ ?
-					   IPU3PipeModeVideo :
-					   IPU3PipeModeStillCapture);
+	V4L2ControlList ctrls(imgu->imgu_->controls());
+	ctrls.set(V4L2_CID_IPU3_PIPE_MODE,
+		  static_cast<int32_t>(vfStream->active_ ? IPU3PipeModeVideo :
+				       IPU3PipeModeStillCapture));
 	ret = imgu->imgu_->setControls(&ctrls);
 	if (ret) {
 		LOG(IPU3, Error) << "Unable to set pipe_mode control";
diff --git a/src/libcamera/pipeline/uvcvideo.cpp b/src/libcamera/pipeline/uvcvideo.cpp
index 88f7fb9b..547ad5ca 100644
--- a/src/libcamera/pipeline/uvcvideo.cpp
+++ b/src/libcamera/pipeline/uvcvideo.cpp
@@ -228,31 +228,30 @@ void PipelineHandlerUVC::stop(Camera *camera)
 
 int PipelineHandlerUVC::processControls(UVCCameraData *data, Request *request)
 {
-	V4L2ControlList controls;
+	V4L2ControlList controls(data->video_->controls());
 
 	for (auto it : request->controls()) {
 		const ControlId &id = *it.first;
 		ControlValue &value = it.second;
 
 		if (id == controls::Brightness) {
-			controls.add(V4L2_CID_BRIGHTNESS, value.get<int32_t>());
+			controls.set(V4L2_CID_BRIGHTNESS, value);
 		} else if (id == controls::Contrast) {
-			controls.add(V4L2_CID_CONTRAST, value.get<int32_t>());
+			controls.set(V4L2_CID_CONTRAST, value);
 		} else if (id == controls::Saturation) {
-			controls.add(V4L2_CID_SATURATION, value.get<int32_t>());
+			controls.set(V4L2_CID_SATURATION, value);
 		} else if (id == controls::ManualExposure) {
-			controls.add(V4L2_CID_EXPOSURE_AUTO, 1);
-			controls.add(V4L2_CID_EXPOSURE_ABSOLUTE, value.get<int32_t>());
+			controls.set(V4L2_CID_EXPOSURE_AUTO, static_cast<int32_t>(1));
+			controls.set(V4L2_CID_EXPOSURE_ABSOLUTE, value);
 		} else if (id == controls::ManualGain) {
-			controls.add(V4L2_CID_GAIN, value.get<int32_t>());
+			controls.set(V4L2_CID_GAIN, value);
 		}
 	}
 
-	for (const V4L2Control &ctrl : controls)
+	for (const auto &ctrl : controls)
 		LOG(UVC, Debug)
-			<< "Setting control 0x"
-			<< std::hex << std::setw(8) << ctrl.id() << std::dec
-			<< " to " << ctrl.value().toString();
+			<< "Setting control " << ctrl.first->name()
+			<< " to " << ctrl.second.toString();
 
 	int ret = data->video_->setControls(&controls);
 	if (ret) {
@@ -338,11 +337,10 @@ int UVCCameraData::init(MediaEntity *entity)
 	/* Initialise the supported controls. */
 	const V4L2ControlInfoMap &controls = video_->controls();
 	for (const auto &ctrl : controls) {
-		unsigned int v4l2Id = ctrl.first;
 		const V4L2ControlInfo &info = ctrl.second;
 		const ControlId *id;
 
-		switch (v4l2Id) {
+		switch (info.id().id()) {
 		case V4L2_CID_BRIGHTNESS:
 			id = &controls::Brightness;
 			break;
diff --git a/src/libcamera/pipeline/vimc.cpp b/src/libcamera/pipeline/vimc.cpp
index f1cfd0ed..53d00360 100644
--- a/src/libcamera/pipeline/vimc.cpp
+++ b/src/libcamera/pipeline/vimc.cpp
@@ -279,26 +279,24 @@ void PipelineHandlerVimc::stop(Camera *camera)
 
 int PipelineHandlerVimc::processControls(VimcCameraData *data, Request *request)
 {
-	V4L2ControlList controls;
+	V4L2ControlList controls(data->sensor_->controls());
 
 	for (auto it : request->controls()) {
 		const ControlId &id = *it.first;
 		ControlValue &value = it.second;
 
-		if (id == controls::Brightness) {
-			controls.add(V4L2_CID_BRIGHTNESS, value.get<int32_t>());
-		} else if (id == controls::Contrast) {
-			controls.add(V4L2_CID_CONTRAST, value.get<int32_t>());
-		} else if (id == controls::Saturation) {
-			controls.add(V4L2_CID_SATURATION, value.get<int32_t>());
-		}
+		if (id == controls::Brightness)
+			controls.set(V4L2_CID_BRIGHTNESS, value);
+		else if (id == controls::Contrast)
+			controls.set(V4L2_CID_CONTRAST, value);
+		else if (id == controls::Saturation)
+			controls.set(V4L2_CID_SATURATION, value);
 	}
 
-	for (const V4L2Control &ctrl : controls)
+	for (const auto &ctrl : controls)
 		LOG(VIMC, Debug)
-			<< "Setting control 0x"
-			<< std::hex << std::setw(8) << ctrl.id() << std::dec
-			<< " to " << ctrl.value().toString();
+			<< "Setting control " << ctrl.first->name()
+			<< " to " << ctrl.second.toString();
 
 	int ret = data->sensor_->setControls(&controls);
 	if (ret) {
@@ -415,11 +413,10 @@ int VimcCameraData::init(MediaDevice *media)
 	/* Initialise the supported controls. */
 	const V4L2ControlInfoMap &controls = sensor_->controls();
 	for (const auto &ctrl : controls) {
-		unsigned int v4l2Id = ctrl.first;
 		const V4L2ControlInfo &info = ctrl.second;
 		const ControlId *id;
 
-		switch (v4l2Id) {
+		switch (info.id().id()) {
 		case V4L2_CID_BRIGHTNESS:
 			id = &controls::Brightness;
 			break;
diff --git a/src/libcamera/v4l2_controls.cpp b/src/libcamera/v4l2_controls.cpp
index 3be21997..c45d3fda 100644
--- a/src/libcamera/v4l2_controls.cpp
+++ b/src/libcamera/v4l2_controls.cpp
@@ -40,7 +40,7 @@
  * sizes.
  *
  * The libcamera V4L2 Controls framework operates on lists of controls, wrapped
- * by the V4L2ControlList class, to match the V4L2 extended controls API. The
+ * by the ControlList class, to match the V4L2 extended controls API. The
  * interface to set and get control is implemented by the V4L2Device class, and
  * this file only provides the data type definitions.
  *
@@ -175,194 +175,42 @@ V4L2ControlInfoMap &V4L2ControlInfoMap::operator=(std::map<unsigned int, V4L2Con
 {
 	std::map<unsigned int, V4L2ControlInfo>::operator=(std::move(info));
 
+	idmap_.clear();
+	for (const auto &ctrl : *this)
+		idmap_[ctrl.first] = &ctrl.second.id();
+
 	return *this;
 }
 
 /**
- * \class V4L2Control
- * \brief A V4L2 control value
- *
- * The V4L2Control class represent the value of a V4L2 control. The class
- * stores values that have been read from or will be applied to a V4L2 device.
- *
- * The value stored in the class instances does not reflect what is actually
- * applied to the hardware but is a pure software cache optionally initialized
- * at control creation time and modified by a control read or write operation.
+ * \fn const ControlIdMap &V4L2ControlInfoMap::idmap() const
+ * \brief Retrieve the ControlId map
  *
- * The write and read controls the V4L2Control class instances are not meant
- * to be directly used but are instead intended to be grouped in
- * V4L2ControlList instances, which are then passed as parameters to
- * V4L2Device::setControls() and V4L2Device::getControls() operations.
- */
-
-/**
- * \fn V4L2Control::V4L2Control
- * \brief Construct a V4L2 control with \a id and \a value
- * \param id The V4L2 control ID
- * \param value The control value
- */
-
-/**
- * \fn V4L2Control::value() const
- * \brief Retrieve the value of the control
+ * Constructing ControlList instances for V4L2 controls requires a ControlIdMap
+ * for the V4L2 device that the control list targets. This helper method
+ * returns a suitable idmap for that purpose.
  *
- * This method is a const version of V4L2Control::value(), returning a const
- * reference to the value.
- *
- * \return The V4L2 control value
- */
-
-/**
- * \fn V4L2Control::value()
- * \brief Retrieve the value of the control
- *
- * This method returns the cached control value, initially set by
- * V4L2ControlList::add() and then updated when the controls are read or
- * written with V4L2Device::getControls() and V4L2Device::setControls().
- *
- * \return The V4L2 control value
- */
-
-/**
- * \fn V4L2Control::id()
- * \brief Retrieve the control ID this instance refers to
- * \return The V4L2Control ID
+ * \return The ControlId map
  */
 
 /**
  * \class V4L2ControlList
- * \brief Container of V4L2Control instances
- *
- * The V4L2ControlList class works as a container for a list of V4L2Control
- * instances. The class provides operations to add a new control to the list,
- * get back a control value, and reset the list of controls it contains.
- *
- * In order to set and get controls, user of the libcamera V4L2 control
- * framework should operate on instances of the V4L2ControlList class, and use
- * them as argument for the V4L2Device::setControls() and
- * V4L2Device::getControls() operations, which write and read a list of
- * controls to or from a V4L2 device (a video device or a subdevice).
- *
- * Controls are added to a V4L2ControlList instance with the add() method, with
- * or without a value.
- *
- * To write controls to a device, the controls of interest shall be added with
- * an initial value by calling V4L2ControlList::add(unsigned int id, int64_t
- * value) to prepare for a write operation. Once the values of all controls of
- * interest have been added, the V4L2ControlList instance is passed to the
- * V4L2Device::setControls(), which sets the controls on the device.
+ * \brief A list of controls for a V4L2 device
  *
- * To read controls from a device, the desired controls are added with
- * V4L2ControlList::add(unsigned int id) to prepare for a read operation. The
- * V4L2ControlList instance is then passed to V4L2Device::getControls(), which
- * reads the controls from the device and updates the values stored in
- * V4L2ControlList.
+ * This class specialises the ControList class for use with V4L2 devices. It
+ * offers a convenience API to create a ControlList from a V4L2ControlInfoMap.
  *
- * V4L2ControlList instances can be reset to remove all controls they contain
- * and prepare to be re-used for a new control write/read sequence.
- */
-
-/**
- * \typedef V4L2ControlList::iterator
- * \brief Iterator on the V4L2 controls contained in the instance
- */
-
-/**
- * \typedef V4L2ControlList::const_iterator
- * \brief Const iterator on the V4L2 controls contained in the instance
- */
-
-/**
- * \fn iterator V4L2ControlList::begin()
- * \brief Retrieve an iterator to the first V4L2Control in the instance
- * \return An iterator to the first V4L2 control
- */
-
-/**
- * \fn const_iterator V4L2ControlList::begin() const
- * \brief Retrieve a constant iterator to the first V4L2Control in the instance
- * \return A constant iterator to the first V4L2 control
+ * V4L2ControlList allows easy construction of a ControlList containing V4L2
+ * controls for a device. It can be used to construct the list of controls
+ * passed to the V4L2Device::getControls() and V4L2Device::setControls()
+ * methods. The class should however not be used in place of ControlList in
+ * APIs.
  */
 
 /**
- * \fn iterator V4L2ControlList::end()
- * \brief Retrieve an iterator pointing to the past-the-end V4L2Control in the
- * instance
- * \return An iterator to the element following the last V4L2 control in the
- * instance
+ * \fn V4L2ControlList::V4L2ControlList(const V4L2ControlInfoMap &info)
+ * \brief Construct a V4L2ControlList associated with a V4L2 device
+ * \param[in] info The V4L2 device control info map
  */
 
-/**
- * \fn const_iterator V4L2ControlList::end() const
- * \brief Retrieve a constant iterator pointing to the past-the-end V4L2Control
- * in the instance
- * \return A constant iterator to the element following the last V4L2 control
- * in the instance
- */
-
-/**
- * \fn V4L2ControlList::empty()
- * \brief Verify if the instance does not contain any control
- * \return True if the instance does not contain any control, false otherwise
- */
-
-/**
- * \fn V4L2ControlList::size()
- * \brief Retrieve the number on controls in the instance
- * \return The number of V4L2Control stored in the instance
- */
-
-/**
- * \fn V4L2ControlList::clear()
- * \brief Remove all controls in the instance
- */
-
-/**
- * \brief Add control with \a id and optional \a value to the instance
- * \param id The V4L2 control ID (V4L2_CID_*)
- * \param value The V4L2 control value
- *
- * This method adds a new V4L2 control to the V4L2ControlList. The newly
- * inserted control shall not already be present in the control lists, otherwise
- * this method, and further use of the control list lead to undefined behaviour.
- */
-void V4L2ControlList::add(unsigned int id, int64_t value)
-{
-	controls_.emplace_back(id, value);
-}
-
-/**
- * \brief Retrieve the control at \a index
- * \param[in] index The control index
- *
- * Controls are stored in a V4L2ControlList in order of insertion and this
- * method retrieves the control at \a index.
- *
- * \return A pointer to the V4L2Control at \a index or nullptr if the
- * index is larger than the number of controls
- */
-V4L2Control *V4L2ControlList::getByIndex(unsigned int index)
-{
-	if (index >= controls_.size())
-		return nullptr;
-
-	return &controls_[index];
-}
-
-/**
- * \brief Retrieve the control with \a id
- * \param[in] id The V4L2 control ID (V4L2_CID_xx)
- * \return A pointer to the V4L2Control with \a id or nullptr if the
- * control ID is not part of this instance.
- */
-V4L2Control *V4L2ControlList::operator[](unsigned int id)
-{
-	for (V4L2Control &ctrl : controls_) {
-		if (ctrl.id() == id)
-			return &ctrl;
-	}
-
-	return nullptr;
-}
-
 } /* namespace libcamera */
diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp
index 1f755f0f..b47ba448 100644
--- a/src/libcamera/v4l2_device.cpp
+++ b/src/libcamera/v4l2_device.cpp
@@ -163,7 +163,7 @@ void V4L2Device::close()
  * \retval -EINVAL One of the control is not supported or not accessible
  * \retval i The index of the control that failed
  */
-int V4L2Device::getControls(V4L2ControlList *ctrls)
+int V4L2Device::getControls(ControlList *ctrls)
 {
 	unsigned int count = ctrls->size();
 	if (count == 0)
@@ -173,18 +173,21 @@ int V4L2Device::getControls(V4L2ControlList *ctrls)
 	struct v4l2_ext_control v4l2Ctrls[count];
 	memset(v4l2Ctrls, 0, sizeof(v4l2Ctrls));
 
-	for (unsigned int i = 0; i < count; ++i) {
-		const V4L2Control *ctrl = ctrls->getByIndex(i);
-		const auto iter = controls_.find(ctrl->id());
+	unsigned int i = 0;
+	for (const auto &ctrl : *ctrls) {
+		const ControlId *id = ctrl.first;
+		const auto iter = controls_.find(id->id());
 		if (iter == controls_.end()) {
 			LOG(V4L2, Error)
-				<< "Control '" << ctrl->id() << "' not found";
+				<< "Control '" << id->name() << "' not found";
 			return -EINVAL;
 		}
 
 		const V4L2ControlInfo *info = &iter->second;
 		controlInfo[i] = info;
-		v4l2Ctrls[i].id = ctrl->id();
+		v4l2Ctrls[i].id = id->id();
+
+		i++;
 	}
 
 	struct v4l2_ext_controls v4l2ExtCtrls = {};
@@ -238,7 +241,7 @@ int V4L2Device::getControls(V4L2ControlList *ctrls)
  * \retval -EINVAL One of the control is not supported or not accessible
  * \retval i The index of the control that failed
  */
-int V4L2Device::setControls(V4L2ControlList *ctrls)
+int V4L2Device::setControls(ControlList *ctrls)
 {
 	unsigned int count = ctrls->size();
 	if (count == 0)
@@ -248,32 +251,36 @@ int V4L2Device::setControls(V4L2ControlList *ctrls)
 	struct v4l2_ext_control v4l2Ctrls[count];
 	memset(v4l2Ctrls, 0, sizeof(v4l2Ctrls));
 
-	for (unsigned int i = 0; i < count; ++i) {
-		const V4L2Control *ctrl = ctrls->getByIndex(i);
-		const auto iter = controls_.find(ctrl->id());
+	unsigned int i = 0;
+	for (const auto &ctrl : *ctrls) {
+		const ControlId *id = ctrl.first;
+		const auto iter = controls_.find(id->id());
 		if (iter == controls_.end()) {
 			LOG(V4L2, Error)
-				<< "Control '" << ctrl->id() << "' not found";
+				<< "Control '" << id->name() << "' not found";
 			return -EINVAL;
 		}
 
 		const V4L2ControlInfo *info = &iter->second;
 		controlInfo[i] = info;
-		v4l2Ctrls[i].id = ctrl->id();
+		v4l2Ctrls[i].id = id->id();
 
 		/* Set the v4l2_ext_control value for the write operation. */
+		const ControlValue &value = ctrl.second;
 		switch (info->id().type()) {
 		case ControlTypeInteger64:
-			v4l2Ctrls[i].value64 = ctrl->value().get<int64_t>();
+			v4l2Ctrls[i].value64 = value.get<int64_t>();
 			break;
 		default:
 			/*
 			 * \todo To be changed when support for string and
 			 * compound controls will be added.
 			 */
-			v4l2Ctrls[i].value = ctrl->value().get<int32_t>();
+			v4l2Ctrls[i].value = value.get<int32_t>();
 			break;
 		}
+
+		i++;
 	}
 
 	struct v4l2_ext_controls v4l2ExtCtrls = {};
@@ -385,28 +392,34 @@ void V4L2Device::listControls()
  * \param[in] v4l2Ctrls List of V4L2 extended controls as returned by the driver
  * \param[in] count The number of controls to update
  */
-void V4L2Device::updateControls(V4L2ControlList *ctrls,
+void V4L2Device::updateControls(ControlList *ctrls,
 				const V4L2ControlInfo **controlInfo,
 				const struct v4l2_ext_control *v4l2Ctrls,
 				unsigned int count)
 {
-	for (unsigned int i = 0; i < count; ++i) {
+	unsigned int i = 0;
+	for (auto &ctrl : *ctrls) {
+		if (i == count)
+			break;
+
 		const struct v4l2_ext_control *v4l2Ctrl = &v4l2Ctrls[i];
 		const V4L2ControlInfo *info = controlInfo[i];
-		V4L2Control *ctrl = ctrls->getByIndex(i);
+		ControlValue &value = ctrl.second;
 
 		switch (info->id().type()) {
 		case ControlTypeInteger64:
-			ctrl->value().set<int64_t>(v4l2Ctrl->value64);
+			value.set<int64_t>(v4l2Ctrl->value64);
 			break;
 		default:
 			/*
 			 * \todo To be changed when support for string and
 			 * compound controls will be added.
 			 */
-			ctrl->value().set<int32_t>(v4l2Ctrl->value);
+			value.set<int32_t>(v4l2Ctrl->value);
 			break;
 		}
+
+		i++;
 	}
 }