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 */ 27