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media: v4l2-subdev: document remaining undocumented functions

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There are several undocumented v4l2-subdev functions that are
part of kAPI. Document them.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2017-12-19 06:18:23 -05:00
parent ab9bb73a06
commit 02679876b7
1 changed files with 64 additions and 5 deletions
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69
include/media/v4l2-subdev.h
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@ -861,6 +861,13 @@ struct v4l2_subdev {
struct v4l2_subdev_platform_data *pdata;
};
/**
* media_entity_to_v4l2_subdev - Returns a &struct v4l2_subdev from
* the &struct media_entity embedded in it.
*
* @ent: pointer to &struct media_entity.
*/
#define media_entity_to_v4l2_subdev(ent) \
({ \
typeof(ent) __me_sd_ent = (ent); \
@ -870,14 +877,20 @@ struct v4l2_subdev {
NULL; \
})
/**
* vdev_to_v4l2_subdev - Returns a &struct v4l2_subdev from
* the &struct video_device embedded on it.
*
* @vdev: pointer to &struct video_device
*/
#define vdev_to_v4l2_subdev(vdev) \
((struct v4l2_subdev *)video_get_drvdata(vdev))
/**
* struct v4l2_subdev_fh - Used for storing subdev information per file handle
*
* @vfh: pointer to struct v4l2_fh
* @pad: pointer to v4l2_subdev_pad_config
* @vfh: pointer to &struct v4l2_fh
* @pad: pointer to &struct v4l2_subdev_pad_config
*/
struct v4l2_subdev_fh {
struct v4l2_fh vfh;
@ -886,10 +899,25 @@ struct v4l2_subdev_fh {
#endif
};
/**
* to_v4l2_subdev_fh - Returns a &struct v4l2_subdev_fh from
* the &struct v4l2_fh embedded on it.
*
* @fh: pointer to &struct v4l2_fh
*/
#define to_v4l2_subdev_fh(fh) \
container_of(fh, struct v4l2_subdev_fh, vfh)
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
/**
* v4l2_subdev_get_try_format - ancillary routine to call
* &struct v4l2_subdev_pad_config->try_fmt
*
* @sd: pointer to &struct v4l2_subdev
* @cfg: pointer to &struct v4l2_subdev_pad_config array.
* @pad: index of the pad in the @cfg array.
*/
static inline struct v4l2_mbus_framefmt
*v4l2_subdev_get_try_format(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
@ -900,6 +928,14 @@ static inline struct v4l2_mbus_framefmt
return &cfg[pad].try_fmt;
}
/**
* v4l2_subdev_get_try_crop - ancillary routine to call
* &struct v4l2_subdev_pad_config->try_crop
*
* @sd: pointer to &struct v4l2_subdev
* @cfg: pointer to &struct v4l2_subdev_pad_config array.
* @pad: index of the pad in the @cfg array.
*/
static inline struct v4l2_rect
*v4l2_subdev_get_try_crop(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
@ -910,6 +946,14 @@ static inline struct v4l2_rect
return &cfg[pad].try_crop;
}
/**
* v4l2_subdev_get_try_crop - ancillary routine to call
* &struct v4l2_subdev_pad_config->try_compose
*
* @sd: pointer to &struct v4l2_subdev
* @cfg: pointer to &struct v4l2_subdev_pad_config array.
* @pad: index of the pad in the @cfg array.
*/
static inline struct v4l2_rect
*v4l2_subdev_get_try_compose(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
@ -1026,9 +1070,16 @@ void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg);
void v4l2_subdev_init(struct v4l2_subdev *sd,
const struct v4l2_subdev_ops *ops);
/*
* Call an ops of a v4l2_subdev, doing the right checks against
* NULL pointers.
/**
* v4l2_subdev_call - call an operation of a v4l2_subdev.
*
* @sd: pointer to the &struct v4l2_subdev
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of callbacks functions.
* @f: callback function that will be called if @cond matches.
* The callback functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args...: arguments for @f.
*
* Example: err = v4l2_subdev_call(sd, video, s_std, norm);
*/
@ -1044,6 +1095,14 @@ void v4l2_subdev_init(struct v4l2_subdev *sd,
__result; \
})
/**
* v4l2_subdev_has_op - Checks if a subdev defines a certain operation.
*
* @sd: pointer to the &struct v4l2_subdev
* @o: The group of callback functions in &struct v4l2_subdev_ops
* which @f is a part of.
* @f: callback function to be checked for its existence.
*/
#define v4l2_subdev_has_op(sd, o, f) \
((sd)->ops->o && (sd)->ops->o->f)