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