1 /* 2 * Chromium OS Matrix Keyboard Message Protocol definitions 3 * 4 * Copyright (c) 2012 The Chromium OS Authors. 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 #ifndef _CROS_MESSAGE_H 25 #define _CROS_MESSAGE_H 26 27 /* 28 * Command interface between EC and AP, for LPC, I2C and SPI interfaces. 29 * 30 * This is copied from the Chromium OS Open Source Embedded Controller code. 31 */ 32 enum { 33 /* The header byte, which follows the preamble */ 34 MSG_HEADER = 0xec, 35 36 MSG_HEADER_BYTES = 3, 37 MSG_TRAILER_BYTES = 2, 38 MSG_PROTO_BYTES = MSG_HEADER_BYTES + MSG_TRAILER_BYTES, 39 40 /* Max length of messages */ 41 MSG_BYTES = EC_HOST_PARAM_SIZE + MSG_PROTO_BYTES, 42 }; 43 44 #endif 45