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media: v4l2-ctrls: add v4l2_ctrl_request_hdl_find/put/ctrl_find functions

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If a driver needs to find/inspect the controls set in a request then
it can use these functions.

E.g. to check if a required control is set in a request use this in the
req_validate() implementation:

	int res = -EINVAL;

	hdl = v4l2_ctrl_request_hdl_find(req, parent_hdl);
	if (hdl) {
		if (v4l2_ctrl_request_hdl_ctrl_find(hdl, ctrl_id))
			res = 0;
		v4l2_ctrl_request_hdl_put(hdl);
	}
	return res;

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-07-10 04:00:53 -04:00 committed by Mauro Carvalho Chehab
parent c41e9cff70
commit 5f611d74c2
2 changed files with 73 additions and 1 deletions
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25
drivers/media/v4l2-core/v4l2-ctrls.c
View File

@ -2976,6 +2976,31 @@ static const struct media_request_object_ops req_ops = {
.release = v4l2_ctrl_request_release,
};
struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
struct v4l2_ctrl_handler *parent)
{
struct media_request_object *obj;
if (WARN_ON(req->state != MEDIA_REQUEST_STATE_VALIDATING &&
req->state != MEDIA_REQUEST_STATE_QUEUED))
return NULL;
obj = media_request_object_find(req, &req_ops, parent);
if (obj)
return container_of(obj, struct v4l2_ctrl_handler, req_obj);
return NULL;
}
EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_find);
struct v4l2_ctrl *
v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
{
struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
return (ref && ref->req == ref) ? ref->ctrl : NULL;
}
EXPORT_SYMBOL_GPL(v4l2_ctrl_request_hdl_ctrl_find);
static int v4l2_ctrl_request_bind(struct media_request *req,
struct v4l2_ctrl_handler *hdl,
struct v4l2_ctrl_handler *from)

49
include/media/v4l2-ctrls.h
View File

@ -1111,7 +1111,54 @@ void v4l2_ctrl_request_setup(struct media_request *req,
* request object.
*/
void v4l2_ctrl_request_complete(struct media_request *req,
struct v4l2_ctrl_handler *hdl);
struct v4l2_ctrl_handler *parent);
/**
* v4l2_ctrl_request_hdl_find - Find the control handler in the request
*
* @req: The request
* @parent: The parent control handler ('priv' in media_request_object_find())
*
* This function finds the control handler in the request. It may return
* NULL if not found. When done, you must call v4l2_ctrl_request_put_hdl()
* with the returned handler pointer.
*
* If the request is not in state VALIDATING or QUEUED, then this function
* will always return NULL.
*
* Note that in state VALIDATING the req_queue_mutex is held, so
* no objects can be added or deleted from the request.
*
* In state QUEUED it is the driver that will have to ensure this.
*/
struct v4l2_ctrl_handler *v4l2_ctrl_request_hdl_find(struct media_request *req,
struct v4l2_ctrl_handler *parent);
/**
* v4l2_ctrl_request_hdl_put - Put the control handler
*
* @hdl: Put this control handler
*
* This function released the control handler previously obtained from'
* v4l2_ctrl_request_hdl_find().
*/
static inline void v4l2_ctrl_request_hdl_put(struct v4l2_ctrl_handler *hdl)
{
if (hdl)
media_request_object_put(&hdl->req_obj);
}
/**
* v4l2_ctrl_request_ctrl_find() - Find a control with the given ID.
*
* @hdl: The control handler from the request.
* @id: The ID of the control to find.
*
* This function returns a pointer to the control if this control is
* part of the request or NULL otherwise.
*/
struct v4l2_ctrl *
v4l2_ctrl_request_hdl_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id);
/* Helpers for ioctl_ops */