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[media] v4l2-event.h: document all functions 

Several functions weren't documented. Document them all.

While here, makes checkpatch.pl happy.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-07-22 07:27:06 -03:00
parent 8f511fc4a3
commit 9d4ee1ad92
1 changed files with 113 additions and 12 deletions
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125
include/media/v4l2-event.h
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@ -73,14 +73,15 @@ struct video_device;
* @list: List node for the v4l2_fh->available list.
* @sev: Pointer to parent v4l2_subscribed_event.
* @event: The event itself.
*/
*/
struct v4l2_kevent {
struct list_head list;
struct v4l2_subscribed_event *sev;
struct v4l2_event event;
};
/** struct v4l2_subscribed_event_ops - Subscribed event operations.
/**
* struct v4l2_subscribed_event_ops - Subscribed event operations.
*
* @add: Optional callback, called when a new listener is added
* @del: Optional callback, called when a listener stops listening
@ -88,20 +89,23 @@ struct v4l2_kevent {
* @merge: Optional callback that can merge event 'old' into event 'new'.
*/
struct v4l2_subscribed_event_ops {
int (*add)(struct v4l2_subscribed_event *sev, unsigned elems);
int (*add)(struct v4l2_subscribed_event *sev, unsigned int elems);
void (*del)(struct v4l2_subscribed_event *sev);
void (*replace)(struct v4l2_event *old, const struct v4l2_event *new);
void (*merge)(const struct v4l2_event *old, struct v4l2_event *new);
};
/**
* struct v4l2_subscribed_event - Internal struct representing a subscribed event.
* struct v4l2_subscribed_event - Internal struct representing a subscribed
* event.
*
* @list: List node for the v4l2_fh->subscribed list.
* @type: Event type.
* @id: Associated object ID (e.g. control ID). 0 if there isn't any.
* @flags: Copy of v4l2_event_subscription->flags.
* @fh: Filehandle that subscribed to this event.
* @node: List node that hooks into the object's event list (if there is one).
* @node: List node that hooks into the object's event list
* (if there is one).
* @ops: v4l2_subscribed_event_ops
* @elems: The number of elements in the events array.
* @first: The index of the events containing the oldest available event.
@ -116,27 +120,124 @@ struct v4l2_subscribed_event {
struct v4l2_fh *fh;
struct list_head node;
const struct v4l2_subscribed_event_ops *ops;
unsigned elems;
unsigned first;
unsigned in_use;
unsigned int elems;
unsigned int first;
unsigned int in_use;
struct v4l2_kevent events[];
};
/**
* v4l2_event_dequeue - Dequeue events from video device.
*
* @fh: pointer to struct v4l2_fh
* @event: pointer to struct v4l2_event
* @nonblocking: if not zero, waits for an event to arrive
*/
int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
int nonblocking);
/**
* v4l2_event_queue - Queue events to video device.
*
* @vdev: pointer to &struct video_device
* @ev: pointer to &struct v4l2_event
*
* The event will be queued for all &struct v4l2_fh file handlers.
*
* .. note::
* The driver's only responsibility is to fill in the type and the data
* fields.The other fields will be filled in by V4L2.
*/
void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
/**
* v4l2_event_queue_fh - Queue events to video device.
*
* @fh: pointer to &struct v4l2_fh
* @ev: pointer to &struct v4l2_event
*
*
* The event will be queued only for the specified &struct v4l2_fh file handler.
*
* .. note::
* The driver's only responsibility is to fill in the type and the data
* fields.The other fields will be filled in by V4L2.
*/
void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev);
/**
* v4l2_event_pending - Check if an event is available
*
* @fh: pointer to &struct v4l2_fh
*
* Returns the number of pending events.
*/
int v4l2_event_pending(struct v4l2_fh *fh);
/**
* v4l2_event_subscribe - Subscribes to an event
*
* @fh: pointer to &struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
* @elems: size of the events queue
* @ops: pointer to &v4l2_subscribed_event_ops
*
* .. note::
*
* if @elems is zero, the framework will fill in a default value,
* with is currently 1 element.
*/
int v4l2_event_subscribe(struct v4l2_fh *fh,
const struct v4l2_event_subscription *sub, unsigned elems,
const struct v4l2_event_subscription *sub,
unsigned int elems,
const struct v4l2_subscribed_event_ops *ops);
/**
* v4l2_event_unsubscribe - Unsubscribes to an event
*
* @fh: pointer to &struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
*/
int v4l2_event_unsubscribe(struct v4l2_fh *fh,
const struct v4l2_event_subscription *sub);
/**
* v4l2_event_unsubscribe_all - Unsubscribes to all events
*
* @fh: pointer to &struct v4l2_fh
*/
void v4l2_event_unsubscribe_all(struct v4l2_fh *fh);
int v4l2_event_subdev_unsubscribe(struct v4l2_subdev *sd, struct v4l2_fh *fh,
/**
* v4l2_event_subdev_unsubscribe - Subdev variant of v4l2_event_unsubscribe()
*
* @sd: pointer to &struct v4l2_subdev
* @fh: pointer to &struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
*
* .. note::
*
* This function should be used for the &struct v4l2_subdev_core_ops
* %unsubscribe_event field.
*/
int v4l2_event_subdev_unsubscribe(struct v4l2_subdev *sd,
struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
/**
* v4l2_src_change_event_subscribe -
*
* @fh: pointer to struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
*/
int v4l2_src_change_event_subscribe(struct v4l2_fh *fh,
const struct v4l2_event_subscription *sub);
const struct v4l2_event_subscription *sub);
/**
* v4l2_src_change_event_subdev_subscribe - Variant of v4l2_event_subscribe(),
* meant to subscribe only events of the type %V4L2_EVENT_SOURCE_CHANGE.
*
* @sd: pointer to &struct v4l2_subdev
* @fh: pointer to &struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
*/
int v4l2_src_change_event_subdev_subscribe(struct v4l2_subdev *sd,
struct v4l2_fh *fh, struct v4l2_event_subscription *sub);
struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
#endif /* V4L2_EVENT_H */