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/*
* (C) Copyright 2002 ELTEC Elektronik AG
* Frank Gottschling <fgottschling@eltec.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
/* i8042.h - Intel 8042 keyboard driver header */
#ifndef _I8042_H_
#define _I8042_H_
/* defines */
#define I8042_DATA_REG 0x60 /* keyboard i/o buffer */
#define I8042_STS_REG 0x64 /* keyboard status read */
#define I8042_CMD_REG 0x64 /* keyboard ctrl write */
/* Status register bit defines */
#define STATUS_OBF (1 << 0)
#define STATUS_IBF (1 << 1)
/* Configuration byte bit defines */
#define CONFIG_KIRQ_EN (1 << 0)
#define CONFIG_MIRQ_EN (1 << 1)
#define CONFIG_SET_BIST (1 << 2)
#define CONFIG_KCLK_DIS (1 << 4)
#define CONFIG_MCLK_DIS (1 << 5)
#define CONFIG_AT_TRANS (1 << 6)
/* i8042 commands */
#define CMD_RD_CONFIG 0x20 /* read configuration byte */
#define CMD_WR_CONFIG 0x60 /* write configuration byte */
#define CMD_SELF_TEST 0xaa /* controller self-test */
#define CMD_KBD_DIS 0xad /* keyboard disable */
#define CMD_KBD_EN 0xae /* keyboard enable */
#define CMD_SET_KBD_LED 0xed /* set keyboard led */
#define CMD_DRAIN_OUTPUT 0xf4 /* drain output buffer */
#define CMD_RESET_KBD 0xff /* reset keyboard */
/* i8042 command result */
#define KBC_TEST_OK 0x55
#define KBD_ACK 0xfa
#define KBD_POR 0xaa
/* keyboard scan codes */
#define KBD_US 0 /* default US layout */
#define KBD_GER 1 /* german layout */
#define KBD_TIMEOUT 1000 /* 1 sec */
#define KBD_RESET_TRIES 3
#define AS 0 /* normal character index */
#define SH 1 /* shift index */
#define CN 2 /* control index */
#define NM 3 /* numeric lock index */
#define AK 4 /* right alt key */
#define CP 5 /* capslock index */
#define ST 6 /* stop output index */
#define EX 7 /* extended code index */
#define ES 8 /* escape and extended code index */
#define NORMAL 0x0000 /* normal key */
#define STP 0x0001 /* scroll lock stop output*/
#define NUM 0x0002 /* numeric lock */
#define CAPS 0x0004 /* capslock */
#define SHIFT 0x0008 /* shift */
#define CTRL 0x0010 /* control*/
#define EXT 0x0020 /* extended scan code 0xe0 */
#define ESC 0x0040 /* escape key press */
#define E1 0x0080 /* extended scan code 0xe1 */
#define BRK 0x0100 /* make break flag for keyboard */
#define ALT 0x0200 /* right alt */
/* exports */
/**
* Flush all buffer from keyboard controller to host.
*/
void i8042_flush(void);
/**
* Disables the keyboard so that key strokes no longer generate scancodes to
* the host.
*
* @return 0 if ok, -1 if keyboard input was found while disabling
*/
int i8042_disable(void);
#endif /* _I8042_H_ */
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