mirror of https://github.com/torvalds/linux.git
133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Video4Linux2 generic ISP parameters and statistics support
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*
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* Copyright (C) 2025 Ideas On Board Oy
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* Author: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
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*/
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#include <media/v4l2-isp.h>
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <media/videobuf2-core.h>
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int v4l2_isp_params_validate_buffer_size(struct device *dev,
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struct vb2_buffer *vb,
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size_t max_size)
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{
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size_t header_size = offsetof(struct v4l2_isp_params_buffer, data);
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size_t payload_size = vb2_get_plane_payload(vb, 0);
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/* Payload size can't be greater than the destination buffer size */
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if (payload_size > max_size) {
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dev_dbg(dev, "Payload size is too large: %zu\n", payload_size);
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return -EINVAL;
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}
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/* Payload size can't be smaller than the header size */
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if (payload_size < header_size) {
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dev_dbg(dev, "Payload size is too small: %zu\n", payload_size);
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return -EINVAL;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(v4l2_isp_params_validate_buffer_size);
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int v4l2_isp_params_validate_buffer(struct device *dev, struct vb2_buffer *vb,
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const struct v4l2_isp_params_buffer *buffer,
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const struct v4l2_isp_params_block_type_info *type_info,
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size_t num_block_types)
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{
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size_t header_size = offsetof(struct v4l2_isp_params_buffer, data);
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size_t payload_size = vb2_get_plane_payload(vb, 0);
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size_t block_offset = 0;
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size_t buffer_size;
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/*
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* Currently only the first version of the V4L2 ISP parameters format is
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* supported. We accept both V0 and V1 to support existing drivers
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* compatible with V4L2 ISP that use either 0 or 1 as their "first
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* version" identifiers.
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*/
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if (buffer->version != V4L2_ISP_PARAMS_VERSION_V0 &&
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buffer->version != V4L2_ISP_PARAMS_VERSION_V1) {
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dev_dbg(dev,
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"Unsupported V4L2 ISP parameters format version: %u\n",
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buffer->version);
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return -EINVAL;
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}
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/* Validate the size reported in the header */
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buffer_size = header_size + buffer->data_size;
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if (buffer_size != payload_size) {
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dev_dbg(dev, "Data size %zu and payload size %zu are different\n",
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buffer_size, payload_size);
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return -EINVAL;
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}
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/* Walk the list of ISP configuration blocks and validate them. */
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buffer_size = buffer->data_size;
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while (buffer_size >= sizeof(struct v4l2_isp_params_block_header)) {
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const struct v4l2_isp_params_block_type_info *info;
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const struct v4l2_isp_params_block_header *block;
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block = (const struct v4l2_isp_params_block_header *)
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(buffer->data + block_offset);
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if (block->type >= num_block_types) {
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dev_dbg(dev,
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"Invalid block type %u at offset %zu\n",
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block->type, block_offset);
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return -EINVAL;
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}
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if (block->size > buffer_size) {
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dev_dbg(dev, "Premature end of parameters data\n");
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return -EINVAL;
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}
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/* It's invalid to specify both ENABLE and DISABLE. */
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if ((block->flags & (V4L2_ISP_PARAMS_FL_BLOCK_ENABLE |
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V4L2_ISP_PARAMS_FL_BLOCK_DISABLE)) ==
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(V4L2_ISP_PARAMS_FL_BLOCK_ENABLE |
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V4L2_ISP_PARAMS_FL_BLOCK_DISABLE)) {
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dev_dbg(dev, "Invalid block flags %x at offset %zu\n",
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block->flags, block_offset);
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return -EINVAL;
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}
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/*
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* Match the block reported size against the type info provided
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* one, but allow the block to only contain the header in
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* case it is going to be disabled.
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*/
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info = &type_info[block->type];
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if (block->size != info->size &&
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(!(block->flags & V4L2_ISP_PARAMS_FL_BLOCK_DISABLE) ||
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block->size != sizeof(*block))) {
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dev_dbg(dev,
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"Invalid block size %u (expected %zu) at offset %zu\n",
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block->size, info->size, block_offset);
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return -EINVAL;
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}
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block_offset += block->size;
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buffer_size -= block->size;
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}
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if (buffer_size) {
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dev_dbg(dev, "Unexpected data after the parameters buffer end\n");
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return -EINVAL;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(v4l2_isp_params_validate_buffer);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jacopo Mondi <jacopo.mondi@ideasonboard.com");
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MODULE_DESCRIPTION("V4L2 generic ISP parameters and statistics helpers");
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