drivers/camera: Add config CHROMEOS_CAMERA

Add cros_camera_info struct for camera information, and
check_cros_camera_info() for checking the magic, CRC and version.

BUG=b:144820097
TEST=emerge-kukui coreboot
BRANCH=kukui

Change-Id: I1215fec76643b0cf7e09433e1190e8bd387e6953
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46042
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/src/drivers/camera/cros_camera.c b/src/drivers/camera/cros_camera.c
new file mode 100644
index 0000000000..ff39678033
--- /dev/null
+++ b/src/drivers/camera/cros_camera.c
@@ -0,0 +1,39 @@
+/* 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;
+}