169 lines
5.4 KiB
C
169 lines
5.4 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#ifndef _V4L2_MC_H
|
|
#define _V4L2_MC_H
|
|
|
|
#include <media/media-device.h>
|
|
#include <media/v4l2-dev.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_pipeline_pm_use - Update the use count of an entity
|
|
* @entity: The entity
|
|
* @use: Use (1) or stop using (0) the entity
|
|
*
|
|
* Update the use count of all entities in the pipeline and power entities on or
|
|
* off accordingly.
|
|
*
|
|
* This function is intended to be called in video node open (use ==
|
|
* 1) and release (use == 0). 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. Powering entities
|
|
* off is assumed to never fail. No failure can occur when the use parameter is
|
|
* set to 0.
|
|
*/
|
|
int v4l2_pipeline_pm_use(struct media_entity *entity, int use);
|
|
|
|
|
|
/**
|
|
* 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_use().
|
|
*
|
|
* 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_use(struct media_entity *entity, int use)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
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 */
|