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[media] media: entity: Add media_entity_get_fwnode_pad() function

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This is a wrapper around the media entity get_fwnode_pad operation.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Niklas Söderlund 2017-06-15 06:17:26 -03:00 committed by Mauro Carvalho Chehab
parent ae45cd5efc
commit d295c6a460
2 changed files with 59 additions and 0 deletions
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36
drivers/media/media-entity.c
View File

@ -18,6 +18,7 @@
#include <linux/bitmap.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/slab.h>
#include <media/media-entity.h>
#include <media/media-device.h>
@ -386,6 +387,41 @@ struct media_entity *media_graph_walk_next(struct media_graph *graph)
}
EXPORT_SYMBOL_GPL(media_graph_walk_next);
int media_entity_get_fwnode_pad(struct media_entity *entity,
struct fwnode_handle *fwnode,
unsigned long direction_flags)
{
struct fwnode_endpoint endpoint;
unsigned int i;
int ret;
if (!entity->ops || !entity->ops->get_fwnode_pad) {
for (i = 0; i < entity->num_pads; i++) {
if (entity->pads[i].flags & direction_flags)
return i;
}
return -ENXIO;
}
ret = fwnode_graph_parse_endpoint(fwnode, &endpoint);
if (ret)
return ret;
ret = entity->ops->get_fwnode_pad(&endpoint);
if (ret < 0)
return ret;
if (ret >= entity->num_pads)
return -ENXIO;
if (!(entity->pads[ret].flags & direction_flags))
return -ENXIO;
return ret;
}
EXPORT_SYMBOL_GPL(media_entity_get_fwnode_pad);
/* -----------------------------------------------------------------------------
* Pipeline management
*/

23
include/media/media-entity.h
View File

@ -820,6 +820,29 @@ struct media_pad *media_entity_remote_pad(struct media_pad *pad);
*/
struct media_entity *media_entity_get(struct media_entity *entity);
/**
* media_entity_get_fwnode_pad - Get pad number from fwnode
*
* @entity: The entity
* @fwnode: Pointer to the fwnode_handle which should be used to find the pad
* @direction_flags: Expected direction of the pad, as defined in
* :ref:`include/uapi/linux/media.h <media_header>`
* (seek for ``MEDIA_PAD_FL_*``)
*
* This function can be used to resolve the media pad number from
* a fwnode. This is useful for devices which use more complex
* mappings of media pads.
*
* If the entity dose not implement the get_fwnode_pad() operation
* then this function searches the entity for the first pad that
* matches the @direction_flags.
*
* Return: returns the pad number on success or a negative error code.
*/
int media_entity_get_fwnode_pad(struct media_entity *entity,
struct fwnode_handle *fwnode,
unsigned long direction_flags);
/**
* media_graph_walk_init - Allocate resources used by graph walk.
*