include/cros_ec_message.h

   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