1 /* 2 * (C) Copyright 2002 ELTEC Elektronik AG 3 * Frank Gottschling <fgottschling@eltec.de> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* i8042.h - Intel 8042 keyboard driver header */ 9 10 #ifndef _I8042_H_ 11 #define _I8042_H_ 12 13 /* defines */ 14 15 #define I8042_DATA_REG 0x60 /* keyboard i/o buffer */ 16 #define I8042_STS_REG 0x64 /* keyboard status read */ 17 #define I8042_CMD_REG 0x64 /* keyboard ctrl write */ 18 19 /* Status register bit defines */ 20 #define STATUS_OBF (1 << 0) 21 #define STATUS_IBF (1 << 1) 22 23 /* Configuration byte bit defines */ 24 #define CONFIG_KIRQ_EN (1 << 0) 25 #define CONFIG_MIRQ_EN (1 << 1) 26 #define CONFIG_SET_BIST (1 << 2) 27 #define CONFIG_KCLK_DIS (1 << 4) 28 #define CONFIG_MCLK_DIS (1 << 5) 29 #define CONFIG_AT_TRANS (1 << 6) 30 31 /* i8042 commands */ 32 #define CMD_RD_CONFIG 0x20 /* read configuration byte */ 33 #define CMD_WR_CONFIG 0x60 /* write configuration byte */ 34 #define CMD_SELF_TEST 0xaa /* controller self-test */ 35 #define CMD_KBD_DIS 0xad /* keyboard disable */ 36 #define CMD_KBD_EN 0xae /* keyboard enable */ 37 #define CMD_SET_KBD_LED 0xed /* set keyboard led */ 38 #define CMD_DRAIN_OUTPUT 0xf4 /* drain output buffer */ 39 #define CMD_RESET_KBD 0xff /* reset keyboard */ 40 41 /* i8042 command result */ 42 #define KBC_TEST_OK 0x55 43 #define KBD_ACK 0xfa 44 #define KBD_POR 0xaa 45 46 /* keyboard scan codes */ 47 48 #define KBD_US 0 /* default US layout */ 49 #define KBD_GER 1 /* german layout */ 50 51 #define KBD_TIMEOUT 1000 /* 1 sec */ 52 #define KBD_RESET_TRIES 3 53 54 #define AS 0 /* normal character index */ 55 #define SH 1 /* shift index */ 56 #define CN 2 /* control index */ 57 #define NM 3 /* numeric lock index */ 58 #define AK 4 /* right alt key */ 59 #define CP 5 /* capslock index */ 60 #define ST 6 /* stop output index */ 61 #define EX 7 /* extended code index */ 62 #define ES 8 /* escape and extended code index */ 63 64 #define NORMAL 0x0000 /* normal key */ 65 #define STP 0x0001 /* scroll lock stop output*/ 66 #define NUM 0x0002 /* numeric lock */ 67 #define CAPS 0x0004 /* capslock */ 68 #define SHIFT 0x0008 /* shift */ 69 #define CTRL 0x0010 /* control*/ 70 #define EXT 0x0020 /* extended scan code 0xe0 */ 71 #define ESC 0x0040 /* escape key press */ 72 #define E1 0x0080 /* extended scan code 0xe1 */ 73 #define BRK 0x0100 /* make break flag for keyboard */ 74 #define ALT 0x0200 /* right alt */ 75 76 /* exports */ 77 78 /** 79 * Flush all buffer from keyboard controller to host. 80 */ 81 void i8042_flush(void); 82 83 /** 84 * Disables the keyboard so that key strokes no longer generate scancodes to 85 * the host. 86 * 87 * @return 0 if ok, -1 if keyboard input was found while disabling 88 */ 89 int i8042_disable(void); 90 91 #endif /* _I8042_H_ */ 92