src/ec/google/chromeec/ec_message.h

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