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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Video4Linux2 generic ISP parameters and statistics support
*
* Copyright (C) 2025 Ideas On Board Oy
* Author: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
*/
#ifndef _V4L2_ISP_H_
#define _V4L2_ISP_H_
#include <linux/media/v4l2-isp.h>
struct device;
struct vb2_buffer;
/**
* v4l2_isp_buffer_size - Calculate size of v4l2_isp_buffer
* @max_size: The total size of the ISP configuration or statistics blocks
*
* Users of v4l2-isp will have differing sized data arrays for parameters and
* statistics, depending on their specific blocks. Drivers need to be able to
* calculate the appropriate size of the buffer to accommodate all ISP blocks
* supported by the platform. This macro provides a convenient tool for the
* calculation.
*
* The intended users of this function are drivers initializing the size
* of their metadata (parameters and statistics) buffers.
*
*/
#define v4l2_isp_buffer_size(max_size) \
(offsetof(struct v4l2_isp_buffer, data) + (max_size))
/**
* v4l2_isp_params_validate_buffer_size - Validate a V4L2 ISP buffer sizes
* @dev: the driver's device pointer
* @vb: the videobuf2 buffer
* @max_size: the maximum allowed buffer size
*
* This function performs validation of the size of a V4L2 ISP parameters buffer
* before the driver can access the actual data buffer content.
*
* After the sizes validation, drivers should copy the buffer content to a
* kernel-only memory area to prevent userspace from modifying it,
* before completing validation using v4l2_isp_params_validate_buffer().
*
* The @vb buffer as received from the vb2 .buf_prepare() operation is checked
* against @max_size and it's validated to be large enough to accommodate at
* least one ISP configuration block.
*/
int v4l2_isp_params_validate_buffer_size(struct device *dev,
struct vb2_buffer *vb,
size_t max_size);
/**
* struct v4l2_isp_params_block_type_info - V4L2 ISP params per-block-type info
* @size: the block type expected size
* @block_validate: driver's callback to implement per-block validation
*
* The v4l2_isp_params_block_type_info collects information of the ISP
* configuration block types for validation purposes. It contains the expected
* block type size and a function pointer where drivers can register a callback
* for additional per-block validation purposes. The validation function is
* expected to return 0 on success or a negative error number for errors.
*
* Drivers shall prepare a list of block type info, indexed by block type, one
* for each supported ISP block type and correctly populate them with the
* expected block type size and the optional callback.
*/
struct v4l2_isp_params_block_type_info {
size_t size;
int (*block_validate)(struct device *dev,
const struct v4l2_isp_block_header *block);
};
/**
* v4l2_isp_params_validate_buffer - Validate a V4L2 ISP parameters buffer
* @dev: the driver's device pointer
* @vb: the videobuf2 buffer
* @buffer: the V4L2 ISP parameters buffer
* @type_info: the array of per-block-type validation info
* @num_block_types: the number of block types in the type_info array
*
* This function completes the validation of a V4L2 ISP parameters buffer,
* verifying each configuration block correctness before the driver can use
* them to program the hardware.
*
* Drivers should use this function after having validated the correctness of
* the vb2 buffer sizes by using the v4l2_isp_params_validate_buffer_size()
* helper first. Once the buffer size has been validated, drivers should
* perform a copy of the user provided buffer into a kernel-only memory buffer
* to prevent userspace from modifying its content after it has been submitted
* to the driver, and then call this function to complete validation.
*/
int v4l2_isp_params_validate_buffer(struct device *dev, struct vb2_buffer *vb,
const struct v4l2_isp_params_buffer *buffer,
const struct v4l2_isp_params_block_type_info *type_info,
size_t num_block_types);
/**
* struct v4l2_isp_stats_block_type_info - V4L2 ISP stats per-block-type info
* @size: the block type expected size
*
* The v4l2_isp_stats_block_type_info collects information of the ISP
* statistics block types for validation purposes. It currently only contains
* the expected block size.
*
* Drivers shall prepare a list of statistics block type info, indexed by block
* type, one for each supported ISP statistics block type and correctly populate
* them with the expected block size.
*/
struct v4l2_isp_stats_block_type_info {
size_t size;
};
/**
* v4l2_isp_stats_init_buffer - Initialize a statistics buffer
*
* Initialize a buffer of statistics. Only set the 'version' field and reset
* 'data_size' to 0.
*
* @buf: the v4l2_isp_buffer to initialize
* @version: the v4l2-isp serialization format version used by the driver
*/
void v4l2_isp_stats_init_buffer(struct v4l2_isp_buffer *buf,
enum v4l2_isp_version version);
/**
* v4l2_isp_stats_init_block - Create and initialize a new block in a statistics
* buffer
* @dev: the driver's device pointer
* @buf: the v4l2_isp_buffer where statistics are serialized
* @type_info: the array of per-block-type validation info
* @num_block_types: the number of block types in the type_info array
* @block_type: the type of the statistics block to initialize
* @max_size: the maximum size of the data[] member of @buf
*
* This function locates and initialize a new statistics block in @buf for the
* driver to populate its content. The function checks that enough space for the
* requested @block_type is available in @buf and increments the 'data_size'
* member of @buf. The newly created statistics block's header is initialized
* with the size and type information provided by the caller in @type_info.
*
* Drivers should call this function before populating a new statistics block
* content.
*
* Returns a pointer to the next available location in @buf, or an error pointer
* if the requested @block_size is not available in @buf or @block_type is not
* valid.
*/
struct v4l2_isp_block_header *
v4l2_isp_stats_init_block(struct device *dev, struct v4l2_isp_buffer *buf,
const struct v4l2_isp_stats_block_type_info *type_info,
size_t num_block_types, unsigned int block_type,
size_t max_size);
#endif /* _V4L2_ISP_H_ */
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