src/drivers/camera/cros_camera.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <crc_byte.h>
   5 #include <string.h>
   6
   7 #include "cros_camera.h"
   8
   9 int check_cros_camera_info(const struct cros_camera_info *info)
  10 {
  11         if (memcmp(info->magic, CROS_CAMERA_INFO_MAGIC, sizeof(info->magic))) {
  12                 printk(BIOS_ERR, "Invalid magic in camera info\n");
  13                 return -1;
  14         }
  15
  16         const uint8_t *ptr = (void *)(&info->crc16 + 1);
  17         uint16_t crc16 = 0;
  18         while (ptr < (uint8_t *)info + sizeof(struct cros_camera_info))
  19                 crc16 = crc16_byte(crc16, *ptr++);
  20
  21         if (info->crc16 != crc16) {
  22                 printk(BIOS_ERR, "Incorrect CRC16: expected %#06x, got %#06x\n",
  23                        crc16, info->crc16);
  24                 return -1;
  25         }
  26
  27         if (info->version != CROS_CAMERA_INFO_VERSION) {
  28                 printk(BIOS_ERR, "Unknown camera info version: %u\n",
  29                        info->version);
  30                 return -1;
  31         }
  32         if (info->size < CROS_CAMERA_INFO_SIZE_MIN) {
  33                 printk(BIOS_ERR, "Size of camera info is too small: %u\n",
  34                        info->size);
  35                 return -1;
  36         }
  37
  38         return 0;
  39 }