18 files changed, 116 insertions, 98 deletions
diff --git a/Documentation/coding-style.rst b/Documentation/coding-style.rst
index 065fbe0a..8dd1afce 100644
--- a/Documentation/coding-style.rst
+++ b/Documentation/coding-style.rst
@@ -171,6 +171,55 @@ These rules match the `object ownership rules from the Chromium C++ Style Guide`
    documented explicitly in details in the API.
 
 
+Documentation
+-------------
+
+All public and protected classes, structures, enumerations, macros, functions
+and variables shall be documented with a Doxygen comment block, using the
+Javadoc style with C-style comments. When documenting private member functions
+and variables the same Doxygen style shall be used as for public and protected
+members.
+
+Documentation relates to header files, but shall be stored in the .cpp source
+files in order to group the implementation and documentation. Every documented
+header file shall have a \file documentation block in the .cpp source file.
+
+The following comment block shows an example of correct documentation for a
+member function of the PipelineHandler class.
+
+::
+
+  /**
+   * \fn PipelineHandler::start()
+   * \brief Start capturing from a group of streams
+   * \param[in] camera The camera to start
+   *
+   * Start the group of streams that have been configured for capture by
+   * \a configureStreams(). The intended caller of this method is the Camera
+   * class which will in turn be called from the application to indicate that
+   * it has configured the streams and is ready to capture.
+   *
+   * \return 0 on success or a negative error code otherwise
+   */
+
+The comment block shall be placed right before the function it documents. If
+the function is defined inline in the class definition in the header file, the
+comment block shall be placed alone in the .cpp source file in the same order
+as the function definitions in the header file and shall start with an \fn
+line. Otherwise no \fn line shall be present.
+
+The \brief directive shall be present. If the function takes parameters, \param
+directives shall be present, with the appropriate [in], [out] or [inout]
+specifiers. Only when the direction of the parameters isn't known (for instance
+when defining a template function with variadic arguments) the direction
+specifier shall be omitted. The \return directive shall be present when the
+function returns a value, and shall be omitted otherwise.
+
+The long description is optional. When present it shall be surrounded by empty
+lines and may span multiple paragraphs. No blank lines shall otherwise be added
+between the \fn, \brief, \param and \return directives.
+
+
 Tools
 -----
 
diff --git a/src/libcamera/camera.cpp b/src/libcamera/camera.cpp
index bd381fa1..69406b51 100644
--- a/src/libcamera/camera.cpp
+++ b/src/libcamera/camera.cpp
@@ -77,7 +77,6 @@ CameraConfiguration::CameraConfiguration()
 
 /**
  * \brief Retrieve an iterator to the first stream in the sequence
- *
  * \return An iterator to the first stream
  */
 std::vector<Stream *>::iterator CameraConfiguration::begin()
@@ -88,7 +87,6 @@ std::vector<Stream *>::iterator CameraConfiguration::begin()
 /**
  * \brief Retrieve an iterator pointing to the past-the-end stream in the
  * sequence
- *
  * \return An iterator to the element following the last stream
  */
 std::vector<Stream *>::iterator CameraConfiguration::end()
@@ -98,7 +96,6 @@ std::vector<Stream *>::iterator CameraConfiguration::end()
 
 /**
  * \brief Retrieve a const iterator to the first element of the streams
- *
  * \return A const iterator to the first stream
  */
 std::vector<Stream *>::const_iterator CameraConfiguration::begin() const
@@ -109,7 +106,6 @@ std::vector<Stream *>::const_iterator CameraConfiguration::begin() const
 /**
  * \brief Retrieve a const iterator pointing to the past-the-end stream in the
  * sequence
- *
  * \return A const iterator to the element following the last stream
  */
 std::vector<Stream *>::const_iterator CameraConfiguration::end() const
@@ -144,7 +140,6 @@ bool CameraConfiguration::isValid() const
 
 /**
  * \brief Check if the camera configuration is empty
- *
  * \return True if the configuration is empty
  */
 bool CameraConfiguration::isEmpty() const
@@ -154,7 +149,6 @@ bool CameraConfiguration::isEmpty() const
 
 /**
  * \brief Retrieve the number of stream configurations
- *
  * \return Number of stream configurations
  */
 std::size_t CameraConfiguration::size() const
@@ -164,7 +158,6 @@ std::size_t CameraConfiguration::size() const
 
 /**
  * \brief Access the first stream in the configuration
- *
  * \return The first stream in the configuration
  */
 Stream *CameraConfiguration::front()
@@ -174,7 +167,6 @@ Stream *CameraConfiguration::front()
 
 /**
  * \brief Access the first stream in the configuration
- *
  * \return The first const stream pointer in the configuration
  */
 const Stream *CameraConfiguration::front() const
@@ -359,7 +351,6 @@ std::shared_ptr<Camera> Camera::create(PipelineHandler *pipe,
 
 /**
  * \brief Retrieve the name of the camera
- *
  * \return Name of the camera device
  */
 const std::string &Camera::name() const
diff --git a/src/libcamera/camera_manager.cpp b/src/libcamera/camera_manager.cpp
index 66a42b35..e2473816 100644
--- a/src/libcamera/camera_manager.cpp
+++ b/src/libcamera/camera_manager.cpp
@@ -151,7 +151,6 @@ void CameraManager::stop()
 
 /**
  * \brief Get a camera based on name
- *
  * \param[in] name Name of camera to get
  *
  * Before calling this function the caller is responsible for ensuring that
@@ -229,7 +228,7 @@ CameraManager *CameraManager::instance()
 
 /**
  * \brief Set the event dispatcher
- * \param dispatcher Pointer to the event dispatcher
+ * \param[in] dispatcher Pointer to the event dispatcher
  *
  * libcamera requires an event dispatcher to integrate event notification and
  * timers with the application event loop. Applications that want to provide
diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index ca4dd0c9..52bd8f6f 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -242,7 +242,6 @@ V4L2SubdeviceFormat CameraSensor::getFormat(const std::vector<unsigned int> &mbu
 /**
  * \brief Set the sensor output format
  * \param[in] format The desired sensor output format
- *
  * \return 0 on success or a negative error code otherwise
  */
 int CameraSensor::setFormat(V4L2SubdeviceFormat *format)
diff --git a/src/libcamera/device_enumerator.cpp b/src/libcamera/device_enumerator.cpp
index 58b81c35..e7de415b 100644
--- a/src/libcamera/device_enumerator.cpp
+++ b/src/libcamera/device_enumerator.cpp
@@ -317,8 +317,8 @@ std::shared_ptr<MediaDevice> DeviceEnumerator::search(const DeviceMatch &dm)
 /**
  * \fn DeviceEnumerator::lookupDeviceNode(int major, int minor)
  * \brief Lookup device node path from device number
- * \param major The device major number
- * \param minor The device minor number
+ * \param[in] major The device major number
+ * \param[in] minor The device minor number
  *
  * Translate a device number given as \a major and \a minor to a device node
  * path.
diff --git a/src/libcamera/event_dispatcher.cpp b/src/libcamera/event_dispatcher.cpp
index b82c59c3..bb4fddff 100644
--- a/src/libcamera/event_dispatcher.cpp
+++ b/src/libcamera/event_dispatcher.cpp
@@ -42,7 +42,7 @@ EventDispatcher::~EventDispatcher()
 /**
  * \fn EventDispatcher::registerEventNotifier()
  * \brief Register an event notifier
- * \param notifier The event notifier to register
+ * \param[in] notifier The event notifier to register
  *
  * Once the \a notifier is registered with the dispatcher, the dispatcher will
  * emit the notifier \ref EventNotifier::activated signal whenever a
@@ -57,7 +57,7 @@ EventDispatcher::~EventDispatcher()
 /**
  * \fn EventDispatcher::unregisterEventNotifier()
  * \brief Unregister an event notifier
- * \param notifier The event notifier to unregister
+ * \param[in] notifier The event notifier to unregister
  *
  * After this function returns the \a notifier is guaranteed not to emit the
  * \ref EventNotifier::activated signal.
@@ -68,7 +68,7 @@ EventDispatcher::~EventDispatcher()
 /**
  * \fn EventDispatcher::registerTimer()
  * \brief Register a timer
- * \param timer The timer to register
+ * \param[in] timer The timer to register
  *
  * Once the \a timer is registered with the dispatcher, the dispatcher will emit
  * the timer \ref Timer::timeout signal when the timer times out. The timer can
@@ -86,7 +86,7 @@ EventDispatcher::~EventDispatcher()
 /**
  * \fn EventDispatcher::unregisterTimer()
  * \brief Unregister a timer
- * \param timer The timer to unregister
+ * \param[in] timer The timer to unregister
  *
  * After this function returns the \a timer is guaranteed not to emit the
  * \ref Timer::timeout signal.
diff --git a/src/libcamera/event_notifier.cpp b/src/libcamera/event_notifier.cpp
index 71775a9c..0f84e412 100644
--- a/src/libcamera/event_notifier.cpp
+++ b/src/libcamera/event_notifier.cpp
@@ -55,8 +55,8 @@ namespace libcamera {
 
 /**
  * \brief Construct an event notifier with a file descriptor and event type
- * \param fd The file descriptor to monitor
- * \param type The event type to monitor
+ * \param[in] fd The file descriptor to monitor
+ * \param[in] type The event type to monitor
  */
 EventNotifier::EventNotifier(int fd, Type type)
 	: fd_(fd), type_(type), enabled_(false)
@@ -90,7 +90,7 @@ EventNotifier::~EventNotifier()
 
 /**
  * \brief Enable or disable the notifier
- * \param enable True to enable the notifier, false to disable it
+ * \param[in] enable True to enable the notifier, false to disable it
  *
  * This function enables or disables the notifier. A disabled notifier ignores
  * events and does not emit the \ref activated signal.
diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
index d14c925a..a39b85e4 100644
--- a/src/libcamera/geometry.cpp
+++ b/src/libcamera/geometry.cpp
@@ -51,7 +51,6 @@ namespace libcamera {
 
 /**
  * \brief Assemble and return a string describing the rectangle
- *
  * \return A string describing the Rectangle
  */
 const std::string Rectangle::toString() const
@@ -94,8 +93,8 @@ bool operator==(const Rectangle &lhs, const Rectangle &rhs)
 /**
  * \fn Size::Size(unsigned int width, unsigned int height)
  * \brief Construct a Size with given \a width and \a height
- * \param width The Size width
- * \param height The Size height
+ * \param[in] width The Size width
+ * \param[in] height The Size height
  */
 
 /**
@@ -191,10 +190,10 @@ bool operator<(const Size &lhs, const Size &rhs)
 /**
  * \fn SizeRange::SizeRange(unsigned int minW, unsigned int minH, unsigned int maxW, unsigned int maxH)
  * \brief Construct an initialized size range
- * \param minW The minimum width
- * \param minH The minimum height
- * \param maxW The maximum width
- * \param maxH The maximum height
+ * \param[in] minW The minimum width
+ * \param[in] minH The minimum height
+ * \param[in] maxW The maximum width
+ * \param[in] maxH The maximum height
  */
 
 /**
diff --git a/src/libcamera/media_device.cpp b/src/libcamera/media_device.cpp
index 1e9024bf..9c438ce8 100644
--- a/src/libcamera/media_device.cpp
+++ b/src/libcamera/media_device.cpp
@@ -63,7 +63,7 @@ LOG_DEFINE_CATEGORY(MediaDevice)
 
 /**
  * \brief Construct a MediaDevice
- * \param deviceNode The media device node path
+ * \param[in] deviceNode The media device node path
  *
  * Once constructed the media device is invalid, and must be opened and
  * populated with open() and populate() before the media graph can be queried.
@@ -306,9 +306,8 @@ int MediaDevice::populate()
 
 /**
  * \brief Return the MediaEntity with name \a name
- * \param name The entity name
- * \return The entity with \a name
- * \return nullptr if no entity with \a name is found
+ * \param[in] name The entity name
+ * \return The entity with \a name, or nullptr if no such entity is found
  */
 MediaEntity *MediaDevice::getEntityByName(const std::string &name) const
 {
@@ -322,10 +321,10 @@ MediaEntity *MediaDevice::getEntityByName(const std::string &name) const
 /**
  * \brief Retrieve the MediaLink connecting two pads, identified by entity
  * names and pad indexes
- * \param sourceName The source entity name
- * \param sourceIdx The index of the source pad
- * \param sinkName The sink entity name
- * \param sinkIdx The index of the sink pad
+ * \param[in] sourceName The source entity name
+ * \param[in] sourceIdx The index of the source pad
+ * \param[in] sinkName The sink entity name
+ * \param[in] sinkIdx The index of the sink pad
  *
  * Find the link that connects the pads at index \a sourceIdx of the source
  * entity with name \a sourceName, to the pad at index \a sinkIdx of the
@@ -351,10 +350,10 @@ MediaLink *MediaDevice::link(const std::string &sourceName, unsigned int sourceI
 /**
  * \brief Retrieve the MediaLink connecting two pads, identified by the
  * entities they belong to and pad indexes
- * \param source The source entity
- * \param sourceIdx The index of the source pad
- * \param sink The sink entity
- * \param sinkIdx The index of the sink pad
+ * \param[in] source The source entity
+ * \param[in] sourceIdx The index of the source pad
+ * \param[in] sink The sink entity
+ * \param[in] sinkIdx The index of the sink pad
  *
  * Find the link that connects the pads at index \a sourceIdx of the source
  * entity \a source, to the pad at index \a sinkIdx of the sink entity \a
@@ -380,8 +379,8 @@ MediaLink *MediaDevice::link(const MediaEntity *source, unsigned int sourceIdx,
 
 /**
  * \brief Retrieve the MediaLink that connects two pads
- * \param source The source pad
- * \param sink The sink pad
+ * \param[in] source The source pad
+ * \param[in] sink The sink pad
  *
  * \sa MediaDevice::link(const std::string &sourceName, unsigned int sourceIdx, const std::string &sinkName, unsigned int sinkIdx) const
  * \sa MediaDevice::link(const MediaEntity *source, unsigned int sourceIdx, const MediaEntity *sink, unsigned int sinkIdx) const
@@ -507,8 +506,8 @@ void MediaDevice::clear()
 
 /**
  * \brief Find the interface associated with an entity
- * \param topology The media topology as returned by MEDIA_IOC_G_TOPOLOGY
- * \param entityId The entity id
+ * \param[in] topology The media topology as returned by MEDIA_IOC_G_TOPOLOGY
+ * \param[in] entityId The entity id
  * \return A pointer to the interface if found, or nullptr otherwise
  */
 struct media_v2_interface *MediaDevice::findInterface(const struct media_v2_topology &topology,
@@ -694,8 +693,8 @@ void MediaDevice::fixupEntityFlags(struct media_v2_entity *entity)
 
 /**
  * \brief Apply \a flags to a link between two pads
- * \param link The link to apply flags to
- * \param flags The flags to apply to the link
+ * \param[in] link The link to apply flags to
+ * \param[in] flags The flags to apply to the link
  *
  * This function applies the link \a flags (as defined by the MEDIA_LNK_FL_*
  * macros from the Media Controller API) to the given \a link. It implements
diff --git a/src/libcamera/media_object.cpp b/src/libcamera/media_object.cpp
index f95d7d8e..bbb8fb64 100644
--- a/src/libcamera/media_object.cpp
+++ b/src/libcamera/media_object.cpp
@@ -58,8 +58,8 @@ LOG_DECLARE_CATEGORY(MediaDevice)
  * \fn MediaObject::MediaObject()
  * \brief Construct a MediaObject part of the MediaDevice \a dev,
  * identified by the \a id unique within the device
- * \param dev The media device this object belongs to
- * \param id The media object id
+ * \param[in] dev The media device this object belongs to
+ * \param[in] id The media object id
  *
  * The caller shall ensure unicity of the object id in the media device context.
  * This constraint is neither enforced nor checked by the MediaObject.
@@ -100,7 +100,7 @@ LOG_DECLARE_CATEGORY(MediaDevice)
 
 /**
  * \brief Enable or disable a link
- * \param enable True to enable the link, false to disable it
+ * \param[in] enable True to enable the link, false to disable it
  *
  * Set the status of a link according to the value of \a enable.
  * Links between two pads can be set to the enabled or disabled state freely,
@@ -128,9 +128,9 @@ int MediaLink::setEnabled(bool enable)
 
 /**
  * \brief Construct a MediaLink
- * \param link The media link kernel data
- * \param source The source pad at the origin of the link
- * \param sink The sink pad at the destination of the link
+ * \param[in] link The media link kernel data
+ * \param[in] source The source pad at the origin of the link
+ * \param[in] sink The sink pad at the destination of the link
  */
 MediaLink::MediaLink(const struct media_v2_link *link, MediaPad *source,
 		     MediaPad *sink)
@@ -181,8 +181,8 @@ MediaLink::MediaLink(const struct media_v2_link *link, MediaPad *source,
 
 /**
  * \brief Construct a MediaPad
- * \param pad The media pad kernel data
- * \param entity The entity the pad belongs to
+ * \param[in] pad The media pad kernel data
+ * \param[in] entity The entity the pad belongs to
  */
 MediaPad::MediaPad(const struct media_v2_pad *pad, MediaEntity *entity)
 	: MediaObject(entity->device(), pad->id), index_(pad->index), entity_(entity),
@@ -230,7 +230,7 @@ MediaPad::~MediaPad()
 
 /**
  * \brief Add a new link to this pad
- * \param link The MediaLink to add
+ * \param[in] link The MediaLink to add
  */
 void MediaPad::addLink(MediaLink *link)
 {
@@ -278,10 +278,8 @@ void MediaPad::addLink(MediaLink *link)
 /**
  * \fn MediaEntity::deviceNode()
  * \brief Retrieve the entity's device node path, if any
- *
- * \sa int setDeviceNode()
- *
  * \return The entity's device node path, or an empty string if it is not set
+ * \sa int setDeviceNode()
  */
 
 /**
@@ -306,7 +304,7 @@ void MediaPad::addLink(MediaLink *link)
 
 /**
  * \brief Get a pad in this entity by its index
- * \param index The 0-based pad index
+ * \param[in] index The 0-based pad index
  * \return The pad identified by \a index, or nullptr if no such pad exist
  */
 const MediaPad *MediaEntity::getPadByIndex(unsigned int index) const
@@ -321,7 +319,7 @@ const MediaPad *MediaEntity::getPadByIndex(unsigned int index) const
 
 /**
  * \brief Get a pad in this entity by its object id
- * \param id The pad id
+ * \param[in] id The pad id
  * \return The pad identified by \a id, or nullptr if no such pad exist
  */
 const MediaPad *MediaEntity::getPadById(unsigned int id) const
@@ -336,7 +334,7 @@ const MediaPad *MediaEntity::getPadById(unsigned int id) const
 
 /**
  * \brief Set the path to the device node for the associated interface
- * \param deviceNode The interface device node path associated with this entity
+ * \param[in] deviceNode The interface device node path associated with this entity
  * \return 0 on success or a negative error code otherwise
  */
 int MediaEntity::setDeviceNode(const std::string &deviceNode)
@@ -358,10 +356,10 @@ int MediaEntity::setDeviceNode(const std::string &deviceNode)
 
 /**
  * \brief Construct a MediaEntity
- * \param dev The media device this entity belongs to
- * \param entity The media entity kernel data
- * \param major The major number of the entity associated interface
- * \param minor The minor number of the entity associated interface
+ * \param[in] dev The media device this entity belongs to
+ * \param[in] entity The media entity kernel data
+ * \param[in] major The major number of the entity associated interface
+ * \param[in] minor The minor number of the entity associated interface
  */
 MediaEntity::MediaEntity(MediaDevice *dev,
 			 const struct media_v2_entity *entity,
@@ -383,7 +381,7 @@ MediaEntity::~MediaEntity()
 
 /**
  * \brief Add \a pad to the entity's list of pads
- * \param pad The pad to add to the list
+ * \param[in] pad The pad to add to the list
  *
  * This function is meant to add pads to the entity during parsing of the media
  * graph, after the MediaPad objects are constructed and before the MediaDevice
diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp
index 64b4210b..405d6548 100644
--- a/src/libcamera/pipeline/ipu3/ipu3.cpp
+++ b/src/libcamera/pipeline/ipu3/ipu3.cpp
@@ -613,7 +613,7 @@ int PipelineHandlerIPU3::registerCameras()
 
 /**
  * \brief Handle buffers completion at the ImgU input
- * \param buffer The completed buffer
+ * \param[in] buffer The completed buffer
  *
  * Buffers completed from the ImgU input are immediately queued back to the
  * CIO2 unit to continue frame capture.
@@ -625,7 +625,7 @@ void PipelineHandlerIPU3::IPU3CameraData::imguInputBufferReady(Buffer *buffer)
 
 /**
  * \brief Handle buffers completion at the ImgU output
- * \param buffer The completed buffer
+ * \param[in] buffer The completed buffer
  *
  * Buffers completed from the ImgU output are directed to the application.
  */
@@ -639,7 +639,7 @@ void PipelineHandlerIPU3::IPU3CameraData::imguOutputBufferReady(Buffer *buffer)
 
 /**
  * \brief Handle buffers completion at the CIO2 output
- * \param buffer The completed buffer
+ * \param[in] buffer The completed buffer
  *
  * Buffers completed from the CIO2 are immediately queued to the ImgU unit
  * for further processing.
@@ -723,7 +723,6 @@ int ImgUDevice::init(MediaDevice *media, unsigned int index)
  * \brief Configure the ImgU unit input
  * \param[in] config The requested stream configuration
  * \param[in] inputFormat The format to be applied to ImgU input
- *
  * \return 0 on success or a negative error code otherwise
  */
 int ImgUDevice::configureInput(const StreamConfiguration &config,
@@ -781,7 +780,6 @@ int ImgUDevice::configureInput(const StreamConfiguration &config,
  * \brief Configure the ImgU unit \a id video output
  * \param[in] output The ImgU output device to configure
  * \param[in] config The requested configuration
- *
  * \return 0 on success or a negative error code otherwise
  */
 int ImgUDevice::configureOutput(ImgUOutput *output,
@@ -822,7 +820,6 @@ int ImgUDevice::configureOutput(ImgUOutput *output,
 /**
  * \brief Import buffers from \a pool into the ImgU input
  * \param[in] pool The buffer pool to import
- *
  * \return 0 on success or a negative error code otherwise
  */
 int ImgUDevice::importBuffers(BufferPool *pool)
@@ -1082,7 +1079,6 @@ int CIO2Device::init(const MediaDevice *media, unsigned int index)
  * \brief Configure the CIO2 unit
  * \param[in] config The requested configuration
  * \param[out] outputFormat The CIO2 unit output image format
- *
  * \return 0 on success or a negative error code otherwise
  */
 int CIO2Device::configure(const StreamConfiguration &config,
diff --git a/src/libcamera/pipeline_handler.cpp b/src/libcamera/pipeline_handler.cpp
index 911d0844..f7a8a1ac 100644
--- a/src/libcamera/pipeline_handler.cpp
+++ b/src/libcamera/pipeline_handler.cpp
@@ -120,7 +120,7 @@ PipelineHandler::~PipelineHandler()
 /**
  * \fn PipelineHandler::match(DeviceEnumerator *enumerator)
  * \brief Match media devices and create camera instances
- * \param enumerator The enumerator providing all media devices found in the
+ * \param[in] enumerator The enumerator providing all media devices found in the
  * system
  *
  * This function is the main entry point of the pipeline handler. It is called
@@ -413,8 +413,7 @@ void PipelineHandler::disconnect()
 
 /**
  * \brief Retrieve the pipeline-specific data associated with a Camera
- * \param camera The camera whose data to retrieve
- *
+ * \param[in] camera The camera whose data to retrieve
  * \return A pointer to the pipeline-specific data passed to registerCamera().
  * The returned pointer is a borrowed reference and is guaranteed to remain
  * valid until the pipeline handler is destroyed. It shall not be deleted
diff --git a/src/libcamera/request.cpp b/src/libcamera/request.cpp
index 433c6f83..ef65c42f 100644
--- a/src/libcamera/request.cpp
+++ b/src/libcamera/request.cpp
@@ -90,7 +90,6 @@ int Request::setBuffers(const std::map<Stream *, Buffer *> &streamMap)
 /**
  * \brief Return the buffer associated with a stream
  * \param[in] stream The stream the buffer is associated to
- *
  * \return The buffer associated with the stream, or nullptr if the stream is
  * not part of this request
  */
diff --git a/src/libcamera/signal.cpp b/src/libcamera/signal.cpp
index cb7daa11..f97d68b3 100644
--- a/src/libcamera/signal.cpp
+++ b/src/libcamera/signal.cpp
@@ -45,8 +45,8 @@ namespace libcamera {
 /**
  * \fn Signal::connect(T *object, void(T::*func)(Args...))
  * \brief Connect the signal to a member function slot
- * \param object The slot object pointer
- * \param func The slot member function
+ * \param[in] object The slot object pointer
+ * \param[in] func The slot member function
  *
  * If the typename T inherits from Object, the signal will be automatically
  * disconnected from the \a func slot of \a object when \a object is destroyed.
@@ -57,7 +57,7 @@ namespace libcamera {
 /**
  * \fn Signal::connect(void(*func)(Args...))
  * \brief Connect the signal to a static function slot
- * \param func The slot static function
+ * \param[in] func The slot static function
  */
 
 /**
@@ -68,20 +68,20 @@ namespace libcamera {
 /**
  * \fn Signal::disconnect(T *object)
  * \brief Disconnect the signal from all slots of the \a object
- * \param object The object pointer whose slots to disconnect
+ * \param[in] object The object pointer whose slots to disconnect
  */
 
 /**
  * \fn Signal::disconnect(T *object, void(T::*func)(Args...))
  * \brief Disconnect the signal from the \a object slot member function \a func
- * \param object The object pointer whose slots to disconnect
- * \param func The slot member function to disconnect
+ * \param[in] object The object pointer whose slots to disconnect
+ * \param[in] func The slot member function to disconnect
  */
 
 /**
  * \fn Signal::disconnect(void(*func)(Args...))
  * \brief Disconnect the signal from the slot static function \a func
- * \param func The slot static function to disconnect
+ * \param[in] func The slot static function to disconnect
  */
 
 /**
diff --git a/src/libcamera/stream.cpp b/src/libcamera/stream.cpp
index 85cd5256..d4ef506c 100644
--- a/src/libcamera/stream.cpp
+++ b/src/libcamera/stream.cpp
@@ -88,14 +88,12 @@ namespace libcamera {
 /**
  * \fn StreamUsage::role()
  * \brief Retrieve the stream role
- *
  * \return The stream role
  */
 
 /**
  * \fn StreamUsage::size()
  * \brief Retrieve desired size
- *
  * \return The desired size
  */
 
diff --git a/src/libcamera/timer.cpp b/src/libcamera/timer.cpp
index e964a94b..f42e479b 100644
--- a/src/libcamera/timer.cpp
+++ b/src/libcamera/timer.cpp
@@ -44,7 +44,7 @@ Timer::Timer()
 
 /**
  * \brief Start or restart the timer with a timeout of \a msec
- * \param msec The timer duration in milliseconds
+ * \param[in] msec The timer duration in milliseconds
  *
  * If the timer is already running it will be stopped and restarted.
  */
diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp
index d394632d..ccc5fbfc 100644
--- a/src/libcamera/v4l2_device.cpp
+++ b/src/libcamera/v4l2_device.cpp
@@ -228,7 +228,6 @@ LOG_DEFINE_CATEGORY(V4L2)
 
 /**
  * \brief Assemble and return a string describing the format
- *
  * \return A string describing the V4L2DeviceFormat
  */
 const std::string V4L2DeviceFormat::toString() const
@@ -267,7 +266,7 @@ const std::string V4L2DeviceFormat::toString() const
 
 /**
  * \brief Construct a V4L2Device
- * \param deviceNode The file-system path to the video device node
+ * \param[in] deviceNode The file-system path to the video device node
  */
 V4L2Device::V4L2Device(const std::string &deviceNode)
 	: deviceNode_(deviceNode), fd_(-1), bufferPool_(nullptr),
@@ -283,7 +282,7 @@ V4L2Device::V4L2Device(const std::string &deviceNode)
 
 /**
  * \brief Construct a V4L2Device from a MediaEntity
- * \param entity The MediaEntity to build the device from
+ * \param[in] entity The MediaEntity to build the device from
  *
  * Construct a V4L2Device from a MediaEntity's device node path.
  */
@@ -421,7 +420,6 @@ std::string V4L2Device::logPrefix() const
 /**
  * \brief Retrieve the image format set on the V4L2 device
  * \param[out] format The image format applied on the device
- *
  * \return 0 on success or a negative error code otherwise
  */
 int V4L2Device::getFormat(V4L2DeviceFormat *format)
@@ -432,7 +430,7 @@ int V4L2Device::getFormat(V4L2DeviceFormat *format)
 
 /**
  * \brief Configure an image format on the V4L2 device
- * \param[in] format The image format to apply to the device
+ * \param[inout] format The image format to apply to the device
  *
  * Apply the supplied \a format to the device, and return the actually
  * applied format parameters, as \ref V4L2Device::getFormat would do.
@@ -885,7 +883,6 @@ void V4L2Device::bufferAvailable(EventNotifier *notifier)
 
 /**
  * \brief Start the video stream
- *
  * \return 0 on success or a negative error code otherwise
  */
 int V4L2Device::streamOn()
diff --git a/src/libcamera/v4l2_subdevice.cpp b/src/libcamera/v4l2_subdevice.cpp
index 5d5b168f..eaa673e9 100644
--- a/src/libcamera/v4l2_subdevice.cpp
+++ b/src/libcamera/v4l2_subdevice.cpp
@@ -75,7 +75,6 @@ LOG_DEFINE_CATEGORY(V4L2Subdev)
 
 /**
  * \brief Assemble and return a string describing the format
- *
  * \return A string describing the V4L2SubdeviceFormat
  */
 const std::string V4L2SubdeviceFormat::toString() const
@@ -119,7 +118,6 @@ V4L2Subdevice::~V4L2Subdevice()
 
 /**
  * \brief Open a V4L2 subdevice
- *
  * \return 0 on success or a negative error code otherwise
  */
 int V4L2Subdevice::open()
@@ -175,7 +173,6 @@ void V4L2Subdevice::close()
  * \brief Set a crop rectangle on one of the V4L2 subdevice pads
  * \param[in] pad The 0-indexed pad number the rectangle is to be applied to
  * \param[inout] rect The rectangle describing crop target area
- *
  * \return 0 on success or a negative error code otherwise
  */
 int V4L2Subdevice::setCrop(unsigned int pad, Rectangle *rect)
@@ -187,7 +184,6 @@ int V4L2Subdevice::setCrop(unsigned int pad, Rectangle *rect)
  * \brief Set a compose rectangle on one of the V4L2 subdevice pads
  * \param[in] pad The 0-indexed pad number the rectangle is to be applied to
  * \param[inout] rect The rectangle describing the compose target area
- *
  * \return 0 on success or a negative error code otherwise
  */
 int V4L2Subdevice::setCompose(unsigned int pad, Rectangle *rect)
@@ -251,7 +247,6 @@ FormatEnum V4L2Subdevice::formats(unsigned int pad)
  * \brief Retrieve the image format set on one of the V4L2 subdevice pads
  * \param[in] pad The 0-indexed pad number the format is to be retrieved from
  * \param[out] format The image bus format
- *
  * \return 0 on success or a negative error code otherwise
  */
 int V4L2Subdevice::getFormat(unsigned int pad, V4L2SubdeviceFormat *format)