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