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/*
* vimc-common.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_COMMON_H_
#define _VIMC_COMMON_H_
#include <linux/slab.h>
#include <media/media-device.h>
#include <media/v4l2-device.h>
#define VIMC_FRAME_MAX_WIDTH 4096
#define VIMC_FRAME_MAX_HEIGHT 2160
#define VIMC_FRAME_MIN_WIDTH 16
#define VIMC_FRAME_MIN_HEIGHT 16
/**
* struct vimc_colorimetry_clamp - Adjust colorimetry parameters
*
* @fmt: the pointer to struct v4l2_pix_format or
* struct v4l2_mbus_framefmt
*
* Entities must check if colorimetry given by the userspace is valid, if not
* then set them as DEFAULT
*/
#define vimc_colorimetry_clamp(fmt) \
do { \
if ((fmt)->colorspace == V4L2_COLORSPACE_DEFAULT \
|| (fmt)->colorspace > V4L2_COLORSPACE_DCI_P3) { \
(fmt)->colorspace = V4L2_COLORSPACE_DEFAULT; \
(fmt)->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; \
(fmt)->quantization = V4L2_QUANTIZATION_DEFAULT; \
(fmt)->xfer_func = V4L2_XFER_FUNC_DEFAULT; \
} \
if ((fmt)->ycbcr_enc > V4L2_YCBCR_ENC_SMPTE240M) \
(fmt)->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; \
if ((fmt)->quantization > V4L2_QUANTIZATION_LIM_RANGE) \
(fmt)->quantization = V4L2_QUANTIZATION_DEFAULT; \
if ((fmt)->xfer_func > V4L2_XFER_FUNC_SMPTE2084) \
(fmt)->xfer_func = V4L2_XFER_FUNC_DEFAULT; \
} while (0)
/**
* struct vimc_platform_data - platform data to components
*
* @entity_name: The name of the entity to be created
*
* Board setup code will often provide additional information using the device's
* platform_data field to hold additional information.
* When injecting a new platform_device in the component system the core needs
* to provide to the corresponding submodules the name of the entity that should
* be used when registering the subdevice in the Media Controller system.
*/
struct vimc_platform_data {
char entity_name[32];
};
/**
* 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
* @process_frame: callback send a frame to that node
* @vdev_get_format: callback that returns the current format a pad, used
* only when is_media_entity_v4l2_video_device(ent) returns
* true
*
* 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 (*process_frame)(struct vimc_ent_device *ved,
struct media_pad *sink, const void *frame);
void (*vdev_get_format)(struct vimc_ent_device *ved,
struct v4l2_pix_format *fmt);
};
/**
* 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_pipeline_s_stream - start stream through the pipeline
*
* @ent: the pointer to struct media_entity for the node
* @enable: 1 to start the stream and 0 to stop
*
* Helper function to call the s_stream of the subdevices connected
* in all the sink pads of the entity
*/
int vimc_pipeline_s_stream(struct media_entity *ent, int enable);
/**
* vimc_pix_map_by_index - get vimc_pix_map struct by its index
*
* @i: index of the vimc_pix_map struct in vimc_pix_map_list
*/
const struct vimc_pix_map *vimc_pix_map_by_index(unsigned int i);
/**
* 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);
/**
* vimc_ent_sd_register - initialize and register a subdev node
*
* @ved: the vimc_ent_device struct to be initialize
* @sd: the v4l2_subdev struct to be initialize and registered
* @v4l2_dev: the v4l2 device to register the v4l2_subdev
* @name: name of the sub-device. Please notice that the name must be
* unique.
* @function: media entity function defined by MEDIA_ENT_F_* macros
* @num_pads: number of pads to initialize
* @pads_flag: flags to use in each pad
* @sd_ops: pointer to &struct v4l2_subdev_ops.
*
* Helper function initialize and register the struct vimc_ent_device and struct
* v4l2_subdev which represents a subdev node in the topology
*/
int vimc_ent_sd_register(struct vimc_ent_device *ved,
struct v4l2_subdev *sd,
struct v4l2_device *v4l2_dev,
const char *const name,
u32 function,
u16 num_pads,
const unsigned long *pads_flag,
const struct v4l2_subdev_ops *sd_ops);
/**
* vimc_ent_sd_unregister - cleanup and unregister a subdev node
*
* @ved: the vimc_ent_device struct to be cleaned up
* @sd: the v4l2_subdev struct to be unregistered
*
* Helper function cleanup and unregister the struct vimc_ent_device and struct
* v4l2_subdev which represents a subdev node in the topology
*/
void vimc_ent_sd_unregister(struct vimc_ent_device *ved,
struct v4l2_subdev *sd);
/**
* vimc_link_validate - validates a media link
*
* @link: pointer to &struct media_link
*
* This function calls validates if a media link is valid for streaming.
*/
int vimc_link_validate(struct media_link *link);
#endif
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