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Hung-ying Tyan88364382013-05-15 18:27:28 +08001/*
2 * Chromium OS Matrix Keyboard Message Protocol definitions
3 *
4 * Copyright (c) 2012 The Chromium OS Authors.
Hung-ying Tyan88364382013-05-15 18:27:28 +08005 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02006 * SPDX-License-Identifier: GPL-2.0+
Hung-ying Tyan88364382013-05-15 18:27:28 +08007 */
8
9#ifndef _CROS_MESSAGE_H
10#define _CROS_MESSAGE_H
11
12/*
13 * Command interface between EC and AP, for LPC, I2C and SPI interfaces.
14 *
15 * This is copied from the Chromium OS Open Source Embedded Controller code.
16 */
17enum {
18 /* The header byte, which follows the preamble */
19 MSG_HEADER = 0xec,
20
21 MSG_HEADER_BYTES = 3,
22 MSG_TRAILER_BYTES = 2,
23 MSG_PROTO_BYTES = MSG_HEADER_BYTES + MSG_TRAILER_BYTES,
24
25 /* Max length of messages */
26 MSG_BYTES = EC_HOST_PARAM_SIZE + MSG_PROTO_BYTES,
27};
28
29#endif