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 29
