1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * Chromium OS Matrix Keyboard Message Protocol definitions 3*4882a593Smuzhiyun * 4*4882a593Smuzhiyun * Copyright (c) 2012 The Chromium OS Authors. 5*4882a593Smuzhiyun * 6*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #ifndef _CROS_MESSAGE_H 10*4882a593Smuzhiyun #define _CROS_MESSAGE_H 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun /* 13*4882a593Smuzhiyun * Command interface between EC and AP, for LPC, I2C and SPI interfaces. 14*4882a593Smuzhiyun * 15*4882a593Smuzhiyun * This is copied from the Chromium OS Open Source Embedded Controller code. 16*4882a593Smuzhiyun */ 17*4882a593Smuzhiyun enum { 18*4882a593Smuzhiyun /* The header byte, which follows the preamble */ 19*4882a593Smuzhiyun MSG_HEADER = 0xec, 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun MSG_HEADER_BYTES = 3, 22*4882a593Smuzhiyun MSG_TRAILER_BYTES = 2, 23*4882a593Smuzhiyun MSG_PROTO_BYTES = MSG_HEADER_BYTES + MSG_TRAILER_BYTES, 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun /* Max length of messages */ 26*4882a593Smuzhiyun MSG_BYTES = EC_PROTO2_MAX_PARAM_SIZE + MSG_PROTO_BYTES, 27*4882a593Smuzhiyun }; 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun #endif 30