cros_camera.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <crc_byte.h>
#include <string.h>
 
#include "cros_camera.h"
 
int check_cros_camera_info(const struct cros_camera_info *info)
{
        if (memcmp(info->magic, CROS_CAMERA_INFO_MAGIC, sizeof(info->magic))) {
                printk(BIOS_ERR, "Invalid magic in camera info\n");
                return -1;
        }
 
        const uint8_t *ptr = (void *)(&info->crc16 + 1);
        uint16_t crc16 = 0;
        while (ptr < (uint8_t *)info + sizeof(struct cros_camera_info))
                crc16 = crc16_byte(crc16, *ptr++);
 
        if (info->crc16 != crc16) {
                printk(BIOS_ERR, "Incorrect CRC16: expected %#06x, got %#06x\n",
                       crc16, info->crc16);
                return -1;
        }
 
        if (info->version != CROS_CAMERA_INFO_VERSION) {
                printk(BIOS_ERR, "Unknown camera info version: %u\n",
                       info->version);
                return -1;
        }
        if (info->size < CROS_CAMERA_INFO_SIZE_MIN) {
                printk(BIOS_ERR, "Size of camera info is too small: %u\n",
                       info->size);
                return -1;
        }
 
        return 0;
}