include/i8042.h

   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_ */