Add doxygen comments

Add doxygen format comments to header files.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Todor Tomov <ttomov@mm-sol.com>

1 files changed, 100 insertions, 0 deletions

diff --git a/subdev.h b/subdev.h
index 976d066..9451b12 100644
--- a/subdev.h
+++ b/subdev.h
@@ -24,20 +24,120 @@
 
 struct media_entity;
 
+/**
+ * @brief Open a sub-device.
+ * @param entity - sub-device media entity.
+ *
+ * Open the V4L2 subdev device node associated with @a entity. The file
+ * descriptor is stored in the media_entity structure.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
 int v4l2_subdev_open(struct media_entity *entity);
 
+/**
+ * @brief Close a sub-device.
+ * @param entity - sub-device media entity.
+ *
+ * Close the V4L2 subdev device node associated with the @a entity and opened by
+ * a previous call to v4l2_subdev_open() (either explicit or implicit).
+ */
 void v4l2_subdev_close(struct media_entity *entity);
 
+/**
+ * @brief Retrieve the format on a pad.
+ * @param entity - subdev-device media entity.
+ * @param format - format to be filled.
+ * @param pad - pad number.
+ * @param which - identifier of the format to get.
+ *
+ * Retrieve the current format on the @a entity @a pad and store it in the
+ * @a format structure.
+ *
+ * @a which is set to V4L2_SUBDEV_FORMAT_TRY to retrieve the try format stored
+ * in the file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to retrieve the current
+ * active format.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
 int v4l2_subdev_get_format(struct media_entity *entity,
 	struct v4l2_mbus_framefmt *format, unsigned int pad,
 	enum v4l2_subdev_format_whence which);
+
+/**
+ * @brief Set the format on a pad.
+ * @param entity - subdev-device media entity.
+ * @param format - format.
+ * @param pad - pad number.
+ * @param which - identifier of the format to set.
+ *
+ * Set the format on the @a entity @a pad to @a format. The driver is allowed to
+ * modify the requested format, in which case @a format is updated with the
+ * modifications.
+ *
+ * @a which is set to V4L2_SUBDEV_FORMAT_TRY to set the try format stored in the
+ * file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to configure the device with an
+ * active format.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
 int v4l2_subdev_set_format(struct media_entity *entity,
 	struct v4l2_mbus_framefmt *format, unsigned int pad,
 	enum v4l2_subdev_format_whence which);
+
+/**
+ * @brief Retrieve the crop rectangle on a pad.
+ * @param entity - subdev-device media entity.
+ * @param rect - crop rectangle to be filled.
+ * @param pad - pad number.
+ * @param which - identifier of the format to get.
+ *
+ * Retrieve the current crop rectangleon the @a entity @a pad and store it in
+ * the @a rect structure.
+ *
+ * @a which is set to V4L2_SUBDEV_FORMAT_TRY to retrieve the try crop rectangle
+ * stored in the file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to retrieve the
+ * current active crop rectangle.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
 int v4l2_subdev_get_crop(struct media_entity *entity, struct v4l2_rect *rect,
 	unsigned int pad, enum v4l2_subdev_format_whence which);
+
+/**
+ * @brief Set the crop rectangle on a pad.
+ * @param entity - subdev-device media entity.
+ * @param rect - crop rectangle.
+ * @param pad - pad number.
+ * @param which - identifier of the format to set.
+ *
+ * Set the crop rectangle on the @a entity @a pad to @a rect. The driver is
+ * allowed to modify the requested rectangle, in which case @a rect is updated
+ * with the modifications.
+ *
+ * @a which is set to V4L2_SUBDEV_FORMAT_TRY to set the try crop rectangle
+ * stored in the file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to configure the
+ * device with an active crop rectangle.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
 int v4l2_subdev_set_crop(struct media_entity *entity, struct v4l2_rect *rect,
 	unsigned int pad, enum v4l2_subdev_format_whence which);
+
+/**
+ * @brief Set the frame interval on a sub-device.
+ * @param entity - subdev-device media entity.
+ * @param interval - frame interval.
+ *
+ * Set the frame interval on subdev @a entity to @a interval. The driver is
+ * allowed to modify the requested frame interval, in which case @a interval is
+ * updated with the modifications.
+ *
+ * Frame interval setting is usually supported only on devices at the beginning
+ * of video pipelines, such as sensors.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
 int v4l2_subdev_set_frame_interval(struct media_entity *entity,
 	struct v4l2_fract *interval);