ec_message.h

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/*
 * Chromium OS Matrix Keyboard Message Protocol definitions
 */
/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#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_HOST_PARAM_SIZE + MSG_PROTO_BYTES,
};
 
#endif /* _CROS_MESSAGE_H */