blob: 36e2d83ce18c7b72f4e1848e9fee44bc85cc28f8
1 | /* |
2 | * Chromium OS Matrix Keyboard Message Protocol definitions |
3 | * |
4 | * Copyright (c) 2012 The Chromium OS Authors. |
5 | * |
6 | * SPDX-License-Identifier: GPL-2.0+ |
7 | */ |
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 | */ |
17 | enum { |
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_PROTO2_MAX_PARAM_SIZE + MSG_PROTO_BYTES, |
27 | }; |
28 | |
29 | #endif |
30 |