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/*
* vimc-core.h Virtual Media Controller Driver
*
* Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
*
* 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 _VIMC_CORE_H_
#define _VIMC_CORE_H_
#include <linux/slab.h>
#include <media/v4l2-device.h>
/**
* struct vimc_pix_map - maps media bus code with v4l2 pixel format
*
* @code: media bus format code defined by MEDIA_BUS_FMT_* macros
* @bbp: number of bytes each pixel occupies
* @pixelformat: pixel format devined by V4L2_PIX_FMT_* macros
*
* Struct which matches the MEDIA_BUS_FMT_* codes with the corresponding
* V4L2_PIX_FMT_* fourcc pixelformat and its bytes per pixel (bpp)
*/
struct vimc_pix_map {
unsigned int code;
unsigned int bpp;
u32 pixelformat;
};
/**
* struct vimc_ent_device - core struct that represents a node in the topology
*
* @ent: the pointer to struct media_entity for the node
* @pads: the list of pads of the node
* @destroy: callback to destroy the node
* @process_frame: callback send a frame to that node
*
* Each node of the topology must create a vimc_ent_device struct. Depending on
* the node it will be of an instance of v4l2_subdev or video_device struct
* where both contains a struct media_entity.
* Those structures should embedded the vimc_ent_device struct through
* v4l2_set_subdevdata() and video_set_drvdata() respectivaly, allowing the
* vimc_ent_device struct to be retrieved from the corresponding struct
* media_entity
*/
struct vimc_ent_device {
struct media_entity *ent;
struct media_pad *pads;
void (*destroy)(struct vimc_ent_device *);
void (*process_frame)(struct vimc_ent_device *ved,
struct media_pad *sink, const void *frame);
};
/**
* vimc_propagate_frame - propagate a frame through the topology
*
* @src: the source pad where the frame is being originated
* @frame: the frame to be propagated
*
* This function will call the process_frame callback from the vimc_ent_device
* struct of the nodes directly connected to the @src pad
*/
int vimc_propagate_frame(struct media_pad *src, const void *frame);
/**
* vimc_pads_init - initialize pads
*
* @num_pads: number of pads to initialize
* @pads_flags: flags to use in each pad
*
* Helper functions to allocate/initialize pads
*/
struct media_pad *vimc_pads_init(u16 num_pads,
const unsigned long *pads_flag);
/**
* vimc_pads_cleanup - free pads
*
* @pads: pointer to the pads
*
* Helper function to free the pads initialized with vimc_pads_init
*/
static inline void vimc_pads_cleanup(struct media_pad *pads)
{
kfree(pads);
}
/**
* vimc_pix_map_by_code - get vimc_pix_map struct by media bus code
*
* @code: media bus format code defined by MEDIA_BUS_FMT_* macros
*/
const struct vimc_pix_map *vimc_pix_map_by_code(u32 code);
/**
* vimc_pix_map_by_pixelformat - get vimc_pix_map struct by v4l2 pixel format
*
* @pixelformat: pixel format devined by V4L2_PIX_FMT_* macros
*/
const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat);
#endif
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