include/cros_ec_message.h

   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