/* SPDX-License-Identifier: GPL-2.0+ */

  /*
   * Chromium OS Matrix Keyboard Message Protocol definitions
   *
   * Copyright (c) 2012 The Chromium OS Authors.

   */
  
  #ifndef _CROS_MESSAGE_H
  #define _CROS_MESSAGE_H
  
  /*
   * Command interface between EC and AP, for LPC, I2C and SPI interfaces.
   *
   * This is copied from the Chromium OS Open Source Embedded Controller code.
   */
  enum {
  	/* The header byte, which follows the preamble */
  	MSG_HEADER	= 0xec,
  
  	MSG_HEADER_BYTES	= 3,
  	MSG_TRAILER_BYTES	= 2,
  	MSG_PROTO_BYTES		= MSG_HEADER_BYTES + MSG_TRAILER_BYTES,
  
  	/* Max length of messages */

  	MSG_BYTES		= EC_PROTO2_MAX_PARAM_SIZE + MSG_PROTO_BYTES,

  };
  
  #endif