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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Video4Linux2 generic ISP parameters and statistics support
*
* Copyright (C) 2025 Ideas On Board Oy
* Author: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
*/
#ifndef _UAPI_V4L2_ISP_H_
#define _UAPI_V4L2_ISP_H_
#include <linux/stddef.h>
#include <linux/types.h>
/**
* enum v4l2_isp_params_version - V4L2 ISP parameters versioning
*
* @V4L2_ISP_PARAMS_VERSION_V0: First version of the V4L2 ISP parameters format
* (for compatibility)
* @V4L2_ISP_PARAMS_VERSION_V1: First version of the V4L2 ISP parameters format
*
* V0 and V1 are identical in order to support drivers compatible with the V4L2
* ISP parameters format already upstreamed which use either 0 or 1 as their
* versioning identifier. Both V0 and V1 refers to the first version of the
* V4L2 ISP parameters format.
*
* Future revisions of the V4L2 ISP parameters format should start from the
* value of 2.
*/
enum v4l2_isp_params_version {
V4L2_ISP_PARAMS_VERSION_V0 = 0,
V4L2_ISP_PARAMS_VERSION_V1
};
#define V4L2_ISP_PARAMS_FL_BLOCK_DISABLE (1U << 0)
#define V4L2_ISP_PARAMS_FL_BLOCK_ENABLE (1U << 1)
/*
* Reserve the first 8 bits for V4L2_ISP_PARAMS_FL_* flag.
*
* Driver-specific flags should be defined as:
* #define DRIVER_SPECIFIC_FLAG0 ((1U << V4L2_ISP_PARAMS_FL_DRIVER_FLAGS(0))
* #define DRIVER_SPECIFIC_FLAG1 ((1U << V4L2_ISP_PARAMS_FL_DRIVER_FLAGS(1))
*/
#define V4L2_ISP_PARAMS_FL_DRIVER_FLAGS(n) ((n) + 8)
/**
* struct v4l2_isp_params_block_header - V4L2 extensible parameters block header
* @type: The parameters block type (driver-specific)
* @flags: A bitmask of block flags (driver-specific)
* @size: Size (in bytes) of the parameters block, including this header
*
* This structure represents the common part of all the ISP configuration
* blocks. Each parameters block shall embed an instance of this structure type
* as its first member, followed by the block-specific configuration data.
*
* The @type field is an ISP driver-specific value that identifies the block
* type. The @size field specifies the size of the parameters block.
*
* The @flags field is a bitmask of per-block flags V4L2_PARAMS_ISP_FL_* and
* driver-specific flags specified by the driver header.
*/
struct v4l2_isp_params_block_header {
__u16 type;
__u16 flags;
__u32 size;
} __attribute__((aligned(8)));
/**
* struct v4l2_isp_params_buffer - V4L2 extensible parameters configuration
* @version: The parameters buffer version (driver-specific)
* @data_size: The configuration data effective size, excluding this header
* @data: The configuration data
*
* This structure contains the configuration parameters of the ISP algorithms,
* serialized by userspace into a data buffer. Each configuration parameter
* block is represented by a block-specific structure which contains a
* :c:type:`v4l2_isp_params_block_header` entry as first member. Userspace
* populates the @data buffer with configuration parameters for the blocks that
* it intends to configure. As a consequence, the data buffer effective size
* changes according to the number of ISP blocks that userspace intends to
* configure and is set by userspace in the @data_size field.
*
* The parameters buffer is versioned by the @version field to allow modifying
* and extending its definition. Userspace shall populate the @version field to
* inform the driver about the version it intends to use. The driver will parse
* and handle the @data buffer according to the data layout specific to the
* indicated version and return an error if the desired version is not
* supported.
*
* For each ISP block that userspace wants to configure, a block-specific
* structure is appended to the @data buffer, one after the other without gaps
* in between. Userspace shall populate the @data_size field with the effective
* size, in bytes, of the @data buffer.
*/
struct v4l2_isp_params_buffer {
__u32 version;
__u32 data_size;
__u8 data[] __counted_by(data_size);
};
#endif /* _UAPI_V4L2_ISP_H_ */
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