include/cros_ec_message.h

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