1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * Chromium OS Matrix Keyboard Message Protocol definitions
4 *
5 * Copyright (c) 2012 The Chromium OS Authors.
6 */
7
8#ifndef _CROS_MESSAGE_H
9#define _CROS_MESSAGE_H
10
11/*
12 * Command interface between EC and AP, for LPC, I2C and SPI interfaces.
13 *
14 * This is copied from the Chromium OS Open Source Embedded Controller code.
15 */
16enum {
17	/* The header byte, which follows the preamble */
18	MSG_HEADER	= 0xec,
19
20	MSG_HEADER_BYTES	= 3,
21	MSG_TRAILER_BYTES	= 2,
22	MSG_PROTO_BYTES		= MSG_HEADER_BYTES + MSG_TRAILER_BYTES,
23
24	/* Max length of messages */
25	MSG_BYTES		= EC_PROTO2_MAX_PARAM_SIZE + MSG_PROTO_BYTES,
26};
27
28#endif
29