218 lines
7.2 KiB
C
218 lines
7.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* v4l2-mc.h - Media Controller V4L2 types and prototypes
|
|
*
|
|
* Copyright (C) 2016 Mauro Carvalho Chehab <mchehab@kernel.org>
|
|
* Copyright (C) 2006-2010 Nokia Corporation
|
|
* Copyright (c) 2016 Intel Corporation.
|
|
*/
|
|
|
|
#ifndef _V4L2_MC_H
|
|
#define _V4L2_MC_H
|
|
|
|
#include <media/media-device.h>
|
|
#include <media/v4l2-dev.h>
|
|
#include <media/v4l2-subdev.h>
|
|
#include <linux/types.h>
|
|
|
|
/* We don't need to include pci.h or usb.h here */
|
|
struct pci_dev;
|
|
struct usb_device;
|
|
|
|
#ifdef CONFIG_MEDIA_CONTROLLER
|
|
/**
|
|
* v4l2_mc_create_media_graph() - create Media Controller links at the graph.
|
|
*
|
|
* @mdev: pointer to the &media_device struct.
|
|
*
|
|
* Add links between the entities commonly found on PC customer's hardware at
|
|
* the V4L2 side: camera sensors, audio and video PLL-IF decoders, tuners,
|
|
* analog TV decoder and I/O entities (video, VBI and Software Defined Radio).
|
|
*
|
|
* .. note::
|
|
*
|
|
* Webcams are modelled on a very simple way: the sensor is
|
|
* connected directly to the I/O entity. All dirty details, like
|
|
* scaler and crop HW are hidden. While such mapping is enough for v4l2
|
|
* interface centric PC-consumer's hardware, V4L2 subdev centric camera
|
|
* hardware should not use this routine, as it will not build the right graph.
|
|
*/
|
|
int v4l2_mc_create_media_graph(struct media_device *mdev);
|
|
|
|
/**
|
|
* v4l_enable_media_source() - Hold media source for exclusive use
|
|
* if free
|
|
*
|
|
* @vdev: pointer to struct video_device
|
|
*
|
|
* This interface calls enable_source handler to determine if
|
|
* media source is free for use. The enable_source handler is
|
|
* responsible for checking is the media source is free and
|
|
* start a pipeline between the media source and the media
|
|
* entity associated with the video device. This interface
|
|
* should be called from v4l2-core and dvb-core interfaces
|
|
* that change the source configuration.
|
|
*
|
|
* Return: returns zero on success or a negative error code.
|
|
*/
|
|
int v4l_enable_media_source(struct video_device *vdev);
|
|
|
|
/**
|
|
* v4l_disable_media_source() - Release media source
|
|
*
|
|
* @vdev: pointer to struct video_device
|
|
*
|
|
* This interface calls disable_source handler to release
|
|
* the media source. The disable_source handler stops the
|
|
* active media pipeline between the media source and the
|
|
* media entity associated with the video device.
|
|
*
|
|
* Return: returns zero on success or a negative error code.
|
|
*/
|
|
void v4l_disable_media_source(struct video_device *vdev);
|
|
|
|
/*
|
|
* v4l_vb2q_enable_media_tuner - Hold media source for exclusive use
|
|
* if free.
|
|
* @q - pointer to struct vb2_queue
|
|
*
|
|
* Wrapper for v4l_enable_media_source(). This function should
|
|
* be called from v4l2-core to enable the media source with
|
|
* pointer to struct vb2_queue as the input argument. Some
|
|
* v4l2-core interfaces don't have access to video device and
|
|
* this interface finds the struct video_device for the q and
|
|
* calls v4l_enable_media_source().
|
|
*/
|
|
int v4l_vb2q_enable_media_source(struct vb2_queue *q);
|
|
|
|
/**
|
|
* v4l2_create_fwnode_links_to_pad - Create fwnode-based links from a
|
|
* source subdev to a sink subdev pad.
|
|
*
|
|
* @src_sd - pointer to a source subdev
|
|
* @sink - pointer to a subdev sink pad
|
|
*
|
|
* This function searches for fwnode endpoint connections from a source
|
|
* subdevice to a single sink pad, and if suitable connections are found,
|
|
* translates them into media links to that pad. The function can be
|
|
* called by the sink subdevice, in its v4l2-async notifier subdev bound
|
|
* callback, to create links from a bound source subdevice.
|
|
*
|
|
* .. note::
|
|
*
|
|
* Any sink subdevice that calls this function must implement the
|
|
* .get_fwnode_pad media operation in order to verify endpoints passed
|
|
* to the sink are owned by the sink.
|
|
*
|
|
* Return 0 on success or a negative error code on failure.
|
|
*/
|
|
int v4l2_create_fwnode_links_to_pad(struct v4l2_subdev *src_sd,
|
|
struct media_pad *sink);
|
|
|
|
/**
|
|
* v4l2_create_fwnode_links - Create fwnode-based links from a source
|
|
* subdev to a sink subdev.
|
|
*
|
|
* @src_sd - pointer to a source subdevice
|
|
* @sink_sd - pointer to a sink subdevice
|
|
*
|
|
* This function searches for any and all fwnode endpoint connections
|
|
* between source and sink subdevices, and translates them into media
|
|
* links. The function can be called by the sink subdevice, in its
|
|
* v4l2-async notifier subdev bound callback, to create all links from
|
|
* a bound source subdevice.
|
|
*
|
|
* .. note::
|
|
*
|
|
* Any sink subdevice that calls this function must implement the
|
|
* .get_fwnode_pad media operation in order to verify endpoints passed
|
|
* to the sink are owned by the sink.
|
|
*
|
|
* Return 0 on success or a negative error code on failure.
|
|
*/
|
|
int v4l2_create_fwnode_links(struct v4l2_subdev *src_sd,
|
|
struct v4l2_subdev *sink_sd);
|
|
|
|
/**
|
|
* v4l2_pipeline_pm_get - Increase the use count of a pipeline
|
|
* @entity: The root entity of a pipeline
|
|
*
|
|
* Update the use count of all entities in the pipeline and power entities on.
|
|
*
|
|
* This function is intended to be called in video node open. It uses
|
|
* struct media_entity.use_count to track the power status. The use
|
|
* of this function should be paired with v4l2_pipeline_link_notify().
|
|
*
|
|
* Return 0 on success or a negative error code on failure.
|
|
*/
|
|
int v4l2_pipeline_pm_get(struct media_entity *entity);
|
|
|
|
/**
|
|
* v4l2_pipeline_pm_put - Decrease the use count of a pipeline
|
|
* @entity: The root entity of a pipeline
|
|
*
|
|
* Update the use count of all entities in the pipeline and power entities off.
|
|
*
|
|
* This function is intended to be called in video node release. It uses
|
|
* struct media_entity.use_count to track the power status. The use
|
|
* of this function should be paired with v4l2_pipeline_link_notify().
|
|
*/
|
|
void v4l2_pipeline_pm_put(struct media_entity *entity);
|
|
|
|
|
|
/**
|
|
* v4l2_pipeline_link_notify - Link management notification callback
|
|
* @link: The link
|
|
* @flags: New link flags that will be applied
|
|
* @notification: The link's state change notification type (MEDIA_DEV_NOTIFY_*)
|
|
*
|
|
* React to link management on powered pipelines by updating the use count of
|
|
* all entities in the source and sink sides of the link. Entities are powered
|
|
* on or off accordingly. The use of this function should be paired
|
|
* with v4l2_pipeline_pm_{get,put}().
|
|
*
|
|
* Return 0 on success or a negative error code on failure. Powering entities
|
|
* off is assumed to never fail. This function will not fail for disconnection
|
|
* events.
|
|
*/
|
|
int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
|
|
unsigned int notification);
|
|
|
|
#else /* CONFIG_MEDIA_CONTROLLER */
|
|
|
|
static inline int v4l2_mc_create_media_graph(struct media_device *mdev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int v4l_enable_media_source(struct video_device *vdev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void v4l_disable_media_source(struct video_device *vdev)
|
|
{
|
|
}
|
|
|
|
static inline int v4l_vb2q_enable_media_source(struct vb2_queue *q)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int v4l2_pipeline_pm_get(struct media_entity *entity)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void v4l2_pipeline_pm_put(struct media_entity *entity)
|
|
{}
|
|
|
|
static inline int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
|
|
unsigned int notification)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_MEDIA_CONTROLLER */
|
|
#endif /* _V4L2_MC_H */
|