xref: /rk3399_rockchip-uboot/drivers/input/i8042.c (revision c5d257f93f1a20a14ee0e9a236e6160b9d2925aa)

/*
 * (C) Copyright 2002 ELTEC Elektronik AG
 * Frank Gottschling <fgottschling@eltec.de>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/* i8042.c - Intel 8042 keyboard driver routines */

/* includes */

#include <common.h>
#include <asm/io.h>
#include <i8042.h>

/* defines */
#define in8(p)		inb(p)
#define out8(p, v)	outb(v, p)

/* locals */

static int kbd_input = -1;		/* no input yet */
static int kbd_mapping = KBD_US;	/* default US keyboard */
static int kbd_flags = NORMAL;		/* after reset */
static int kbd_state;			/* unshift code */

static unsigned char kbd_fct_map[144] = {
	/* kbd_fct_map table for scan code */
	 0,  AS,  AS,  AS,  AS,  AS,  AS,  AS, /* scan 00-07 */
	AS,  AS,  AS,  AS,  AS,  AS,  AS,  AS, /* scan 08-0F */
	AS,  AS,  AS,  AS,  AS,  AS,  AS,  AS, /* scan 10-17 */
	AS,  AS,  AS,  AS,  AS,  CN,  AS,  AS, /* scan 18-1F */
	AS,  AS,  AS,  AS,  AS,  AS,  AS,  AS, /* scan 20-27 */
	AS,  AS,  SH,  AS,  AS,  AS,  AS,  AS, /* scan 28-2F */
	AS,  AS,  AS,  AS,  AS,  AS,  SH,  AS, /* scan 30-37 */
	AS,  AS,  CP,   0,   0,   0,   0,   0, /* scan 38-3F */
	 0,   0,   0,   0,   0,  NM,  ST,  ES, /* scan 40-47 */
	ES,  ES,  ES,  ES,  ES,  ES,  ES,  ES, /* scan 48-4F */
	ES,  ES,  ES,  ES,   0,   0,  AS,   0, /* scan 50-57 */
	 0,   0,   0,   0,   0,   0,   0,   0, /* scan 58-5F */
	 0,   0,   0,   0,   0,   0,   0,   0, /* scan 60-67 */
	 0,   0,   0,   0,   0,   0,   0,   0, /* scan 68-6F */
	AS,   0,   0,  AS,   0,   0,  AS,   0, /* scan 70-77 */
	 0,  AS,   0,   0,   0,  AS,   0,   0, /* scan 78-7F */
	AS,  CN,  AS,  AS,  AK,  ST,  EX,  EX, /* enhanced */
	AS,  EX,  EX,  AS,  EX,  AS,  EX,  EX  /* enhanced */
	};

static unsigned char kbd_key_map[2][5][144] = {
	{ /* US keyboard */
	{ /* unshift code */
	   0, 0x1b,  '1',  '2',  '3',  '4',  '5',  '6', /* scan 00-07 */
	 '7',  '8',  '9',  '0',  '-',  '=', 0x08, '\t', /* scan 08-0F */
	 'q',  'w',  'e',  'r',  't',  'y',  'u',  'i', /* scan 10-17 */
	 'o',  'p',  '[',  ']', '\r',   CN,  'a',  's', /* scan 18-1F */
	 'd',  'f',  'g',  'h',  'j',  'k',  'l',  ';', /* scan 20-27 */
	'\'',  '`',   SH, '\\',  'z',  'x',  'c',  'v', /* scan 28-2F */
	 'b',  'n',  'm',  ',',  '.',  '/',   SH,  '*', /* scan 30-37 */
	 ' ',  ' ',   CP,    0,    0,    0,    0,    0, /* scan 38-3F */
	   0,    0,    0,    0,    0,   NM,   ST,  '7', /* scan 40-47 */
	 '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1', /* scan 48-4F */
	 '2',  '3',  '0',  '.',    0,    0,    0,    0, /* scan 50-57 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 58-5F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 60-67 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 68-6F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 70-77 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 78-7F */
	'\r',   CN,  '/',  '*',  ' ',   ST,  'F',  'A', /* extended */
	   0,  'D',  'C',    0,  'B',    0,  '@',  'P'  /* extended */
	},
	{ /* shift code */
	   0, 0x1b,  '!',  '@',  '#',  '$',  '%',  '^', /* scan 00-07 */
	 '&',  '*',  '(',  ')',  '_',  '+', 0x08, '\t', /* scan 08-0F */
	 'Q',  'W',  'E',  'R',  'T',  'Y',  'U',  'I', /* scan 10-17 */
	 'O',  'P',  '{',  '}', '\r',   CN,  'A',  'S', /* scan 18-1F */
	 'D',  'F',  'G',  'H',  'J',  'K',  'L',  ':', /* scan 20-27 */
	 '"',  '~',   SH,  '|',  'Z',  'X',  'C',  'V', /* scan 28-2F */
	 'B',  'N',  'M',  '<',  '>',  '?',   SH,  '*', /* scan 30-37 */
	 ' ',  ' ',   CP,    0,    0,    0,    0,    0, /* scan 38-3F */
	   0,    0,    0,    0,    0,   NM,   ST,  '7', /* scan 40-47 */
	 '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1', /* scan 48-4F */
	 '2',  '3',  '0',  '.',    0,    0,    0,    0, /* scan 50-57 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 58-5F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 60-67 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 68-6F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 70-77 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 78-7F */
	'\r',   CN,  '/',  '*',  ' ',   ST,  'F',  'A', /* extended */
	   0,  'D',  'C',    0,  'B',    0,  '@',  'P'  /* extended */
	},
	{ /* control code */
	0xff, 0x1b, 0xff, 0x00, 0xff, 0xff, 0xff, 0xff, /* scan 00-07 */
	0x1e, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, '\t', /* scan 08-0F */
	0x11, 0x17, 0x05, 0x12, 0x14, 0x19, 0x15, 0x09, /* scan 10-17 */
	0x0f, 0x10, 0x1b, 0x1d, '\r',   CN, 0x01, 0x13, /* scan 18-1F */
	0x04, 0x06, 0x07, 0x08, 0x0a, 0x0b, 0x0c, 0xff, /* scan 20-27 */
	0xff, 0x1c,   SH, 0xff, 0x1a, 0x18, 0x03, 0x16, /* scan 28-2F */
	0x02, 0x0e, 0x0d, 0xff, 0xff, 0xff,   SH, 0xff, /* scan 30-37 */
	0xff, 0xff,   CP, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
	0xff, 0xff, 0xff, 0xff, 0xff,   NM,   ST, 0xff, /* scan 40-47 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 48-4F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 50-57 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 58-5F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 60-67 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 68-6F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 70-77 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 78-7F */
	'\r',   CN,  '/',  '*',  ' ',   ST, 0xff, 0xff, /* extended */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff  /* extended */
	},
	{ /* non numeric code */
	   0, 0x1b,  '1',  '2',  '3',  '4',  '5',  '6', /* scan 00-07 */
	 '7',  '8',  '9',  '0',  '-',  '=', 0x08, '\t', /* scan 08-0F */
	 'q',  'w',  'e',  'r',  't',  'y',  'u',  'i', /* scan 10-17 */
	 'o',  'p',  '[',  ']', '\r',   CN,  'a',  's', /* scan 18-1F */
	 'd',  'f',  'g',  'h',  'j',  'k',  'l',  ';', /* scan 20-27 */
	'\'',  '`',   SH, '\\',  'z',  'x',  'c',  'v', /* scan 28-2F */
	 'b',  'n',  'm',  ',',  '.',  '/',   SH,  '*', /* scan 30-37 */
	 ' ',  ' ',   CP,    0,    0,    0,    0,    0, /* scan 38-3F */
	   0,    0,    0,    0,    0,   NM,   ST,  'w', /* scan 40-47 */
	 'x',  'y',  'l',  't',  'u',  'v',  'm',  'q', /* scan 48-4F */
	 'r',  's',  'p',  'n',    0,    0,    0,    0, /* scan 50-57 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 58-5F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 60-67 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 68-6F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 70-77 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 78-7F */
	'\r',   CN,  '/',  '*',  ' ',   ST,  'F',  'A', /* extended */
	   0,  'D',  'C',    0,  'B',    0,  '@',  'P'  /* extended */
	},
	{ /* right alt mode - not used in US keyboard */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 00-07 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 08-0F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 10-17 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 18-1F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 20-27 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 28-2F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 30-37 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 40-47 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 48-4F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 50-57 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 58-5F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 60-67 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 68-6F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 70-77 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 78-7F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* extended */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff  /* extended */
	}
	},
	{ /* German keyboard */
	{ /* unshift code */
	   0, 0x1b,  '1',  '2',  '3',  '4',  '5',  '6', /* scan 00-07 */
	 '7',  '8',  '9',  '0', 0xe1, '\'', 0x08, '\t', /* scan 08-0F */
	 'q',  'w',  'e',  'r',  't',  'z',  'u',  'i', /* scan 10-17 */
	 'o',  'p', 0x81,  '+', '\r',   CN,  'a',  's', /* scan 18-1F */
	 'd',  'f',  'g',  'h',  'j',  'k',  'l', 0x94, /* scan 20-27 */
	0x84,  '^',   SH,  '#',  'y',  'x',  'c',  'v', /* scan 28-2F */
	 'b',  'n',  'm',  ',',  '.',  '-',   SH,  '*', /* scan 30-37 */
	 ' ',  ' ',   CP,    0,    0,    0,    0,    0, /* scan 38-3F */
	   0,    0,    0,    0,    0,   NM,   ST,  '7', /* scan 40-47 */
	 '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1', /* scan 48-4F */
	 '2',  '3',  '0',  ',',    0,    0,  '<',    0, /* scan 50-57 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 58-5F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 60-67 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 68-6F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 70-77 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 78-7F */
	'\r',   CN,  '/',  '*',  ' ',   ST,  'F',  'A', /* extended */
	   0,  'D',  'C',    0,  'B',    0,  '@',  'P'  /* extended */
	},
	{ /* shift code */
	   0, 0x1b,  '!',  '"', 0x15,  '$',  '%',  '&', /* scan 00-07 */
	 '/',  '(',  ')',  '=',  '?',  '`', 0x08, '\t', /* scan 08-0F */
	 'Q',  'W',  'E',  'R',  'T',  'Z',  'U',  'I', /* scan 10-17 */
	 'O',  'P', 0x9a,  '*', '\r',   CN,  'A',  'S', /* scan 18-1F */
	 'D',  'F',  'G',  'H',  'J',  'K',  'L', 0x99, /* scan 20-27 */
	0x8e, 0xf8,   SH, '\'',  'Y',  'X',  'C',  'V', /* scan 28-2F */
	 'B',  'N',  'M',  ';',  ':',  '_',   SH,  '*', /* scan 30-37 */
	 ' ',  ' ',   CP,    0,    0,    0,    0,    0, /* scan 38-3F */
	   0,    0,    0,    0,    0,   NM,   ST,  '7', /* scan 40-47 */
	 '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1', /* scan 48-4F */
	 '2',  '3',  '0',  ',',    0,    0,  '>',    0, /* scan 50-57 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 58-5F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 60-67 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 68-6F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 70-77 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 78-7F */
	'\r',   CN,  '/',  '*',  ' ',   ST,  'F',  'A', /* extended */
	   0,  'D',  'C',    0,  'B',    0,  '@',  'P'  /* extended */
	},
	{ /* control code */
	0xff, 0x1b, 0xff, 0x00, 0xff, 0xff, 0xff, 0xff, /* scan 00-07 */
	0x1e, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, '\t', /* scan 08-0F */
	0x11, 0x17, 0x05, 0x12, 0x14, 0x19, 0x15, 0x09, /* scan 10-17 */
	0x0f, 0x10, 0x1b, 0x1d, '\r',   CN, 0x01, 0x13, /* scan 18-1F */
	0x04, 0x06, 0x07, 0x08, 0x0a, 0x0b, 0x0c, 0xff, /* scan 20-27 */
	0xff, 0x1c,   SH, 0xff, 0x1a, 0x18, 0x03, 0x16, /* scan 28-2F */
	0x02, 0x0e, 0x0d, 0xff, 0xff, 0xff,   SH, 0xff, /* scan 30-37 */
	0xff, 0xff,   CP, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
	0xff, 0xff, 0xff, 0xff, 0xff,   NM,   ST, 0xff, /* scan 40-47 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 48-4F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 50-57 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 58-5F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 60-67 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 68-6F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 70-77 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 78-7F */
	'\r',   CN,  '/',  '*',  ' ',   ST, 0xff, 0xff, /* extended */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff  /* extended */
	},
	{ /* non numeric code */
	   0, 0x1b,  '1',  '2',  '3',  '4',  '5',  '6', /* scan 00-07 */
	 '7',  '8',  '9',  '0', 0xe1, '\'', 0x08, '\t', /* scan 08-0F */
	 'q',  'w',  'e',  'r',  't',  'z',  'u',  'i', /* scan 10-17 */
	 'o',  'p', 0x81,  '+', '\r',   CN,  'a',  's', /* scan 18-1F */
	 'd',  'f',  'g',  'h',  'j',  'k',  'l', 0x94, /* scan 20-27 */
	0x84,  '^',   SH,    0,  'y',  'x',  'c',  'v', /* scan 28-2F */
	 'b',  'n',  'm',  ',',  '.',  '-',   SH,  '*', /* scan 30-37 */
	 ' ',  ' ',   CP,    0,    0,    0,    0,    0, /* scan 38-3F */
	   0,    0,    0,    0,    0,   NM,   ST,  'w', /* scan 40-47 */
	 'x',  'y',  'l',  't',  'u',  'v',  'm',  'q', /* scan 48-4F */
	 'r',  's',  'p',  'n',    0,    0,  '<',    0, /* scan 50-57 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 58-5F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 60-67 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 68-6F */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 70-77 */
	   0,    0,    0,    0,    0,    0,    0,    0, /* scan 78-7F */
	'\r',   CN,  '/',  '*',  ' ',   ST,  'F',  'A', /* extended */
	   0,  'D',  'C',    0,  'B',    0,  '@',  'P'  /* extended */
	},
	{ /* right alt mode - is used in German keyboard */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 00-07 */
	 '{',  '[',  ']',  '}', '\\', 0xff, 0xff, 0xff, /* scan 08-0F */
	 '@', 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 10-17 */
	0xff, 0xff, 0xff,  '~', 0xff, 0xff, 0xff, 0xff, /* scan 18-1F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 20-27 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 28-2F */
	0xff, 0xff, 0xe6, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 30-37 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 38-3F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 40-47 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 48-4F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff,  '|', 0xff, /* scan 50-57 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 58-5F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 60-67 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 68-6F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 70-77 */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* scan 78-7F */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* extended */
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff  /* extended */
	}
	}
	};

static unsigned char ext_key_map[] = {
	0x1c, /* keypad enter */
	0x1d, /* right control */
	0x35, /* keypad slash */
	0x37, /* print screen */
	0x38, /* right alt */
	0x46, /* break */
	0x47, /* editpad home */
	0x48, /* editpad up */
	0x49, /* editpad pgup */
	0x4b, /* editpad left */
	0x4d, /* editpad right */
	0x4f, /* editpad end */
	0x50, /* editpad dn */
	0x51, /* editpad pgdn */
	0x52, /* editpad ins */
	0x53, /* editpad del */
	0x00  /* map end */
	};

static int kbd_input_empty(void)
{
	int kbd_timeout = KBD_TIMEOUT * 1000;

	while ((in8(I8042_STS_REG) & STATUS_IBF) && kbd_timeout--)
		udelay(1);

	return kbd_timeout != -1;
}

static int kbd_output_full(void)
{
	int kbd_timeout = KBD_TIMEOUT * 1000;

	while (((in8(I8042_STS_REG) & STATUS_OBF) == 0) && kbd_timeout--)
		udelay(1);

	return kbd_timeout != -1;
}

static void kbd_led_set(void)
{
	kbd_input_empty();
	out8(I8042_DATA_REG, CMD_SET_KBD_LED);
	kbd_input_empty();
	out8(I8042_DATA_REG, (kbd_flags & 0x7));
}

static void kbd_normal(unsigned char scan_code)
{
	unsigned char chr;

	if ((kbd_flags & BRK) == NORMAL) {
		chr = kbd_key_map[kbd_mapping][kbd_state][scan_code];
		if ((chr == 0xff) || (chr == 0x00))
			return;

		/* if caps lock convert upper to lower */
		if (((kbd_flags & CAPS) == CAPS) &&
		    (chr >= 'a' && chr <= 'z')) {
			chr -= 'a' - 'A';
		}
		kbd_input = chr;
	}
}

static void kbd_shift(unsigned char scan_code)
{
	if ((kbd_flags & BRK) == BRK) {
		kbd_state = AS;
		kbd_flags &= (~SHIFT);
	} else {
		kbd_state = SH;
		kbd_flags |= SHIFT;
	}
}

static void kbd_ctrl(unsigned char scan_code)
{
	if ((kbd_flags & BRK) == BRK) {
		kbd_state = AS;
		kbd_flags &= (~CTRL);
	} else {
		kbd_state = CN;
		kbd_flags |= CTRL;
	}
}

static void kbd_num(unsigned char scan_code)
{
	if ((kbd_flags & BRK) == NORMAL) {
		kbd_flags ^= NUM;
		kbd_state = (kbd_flags & NUM) ? AS : NM;
		kbd_led_set();
	}
}

static void kbd_alt(unsigned char scan_code)
{
	if ((kbd_flags & BRK) == BRK) {
		kbd_state = AS;
		kbd_flags &= (~ALT);
	} else {
		kbd_state = AK;
		kbd_flags &= ALT;
	}
}

static void kbd_caps(unsigned char scan_code)
{
	if ((kbd_flags & BRK) == NORMAL) {
		kbd_flags ^= CAPS;
		kbd_led_set();
	}
}

static void kbd_scroll(unsigned char scan_code)
{
	if ((kbd_flags & BRK) == NORMAL) {
		kbd_flags ^= STP;
		kbd_led_set();
		if (kbd_flags & STP)
			kbd_input = 0x13;
		else
			kbd_input = 0x11;
	}
}

static void kbd_conv_char(unsigned char scan_code)
{
	if (scan_code == 0xe0) {
		kbd_flags |= EXT;
		return;
	}

	/* if high bit of scan_code, set break flag */
	if (scan_code & 0x80)
		kbd_flags |=  BRK;
	else
		kbd_flags &= ~BRK;

	if ((scan_code == 0xe1) || (kbd_flags & E1)) {
		if (scan_code == 0xe1) {
			kbd_flags ^= BRK;	/* reset the break flag */
			kbd_flags ^= E1;	/* bitwise EXOR with E1 flag */
		}
		return;
	}

	scan_code &= 0x7f;

	if (kbd_flags & EXT) {
		int i;

		kbd_flags ^= EXT;
		for (i = 0; ext_key_map[i]; i++) {
			if (ext_key_map[i] == scan_code) {
				scan_code = 0x80 + i;
				break;
			}
		}
		/* not found ? */
		if (!ext_key_map[i])
			return;
	}

	switch (kbd_fct_map[scan_code]) {
	case AS:
		kbd_normal(scan_code);
		break;
	case SH:
		kbd_shift(scan_code);
		break;
	case CN:
		kbd_ctrl(scan_code);
		break;
	case NM:
		kbd_num(scan_code);
		break;
	case AK:
		kbd_alt(scan_code);
		break;
	case CP:
		kbd_caps(scan_code);
		break;
	case ST:
		kbd_scroll(scan_code);
		break;
	}

	return;
}

static int kbd_write(int reg, int value)
{
	if (!kbd_input_empty())
		return -1;
	out8(reg, value);

	return 0;
}

static int kbd_read(int reg)
{
	if (!kbd_output_full())
		return -1;

	return in8(reg);
}

static int kbd_cmd_read(int cmd)
{
	if (kbd_write(I8042_CMD_REG, cmd))
		return -1;

	return kbd_read(I8042_DATA_REG);
}

static int kbd_cmd_write(int cmd, int data)
{
	if (kbd_write(I8042_CMD_REG, cmd))
		return -1;

	return kbd_write(I8042_DATA_REG, data);
}

static int kbd_reset(void)
{
	int config;

	/* controller self test */
	if (kbd_cmd_read(CMD_SELF_TEST) != KBC_TEST_OK)
		goto err;

	/* keyboard reset */
	if (kbd_write(I8042_DATA_REG, CMD_RESET_KBD) ||
	    kbd_read(I8042_DATA_REG) != KBD_ACK ||
	    kbd_read(I8042_DATA_REG) != KBD_POR)
		goto err;

	/* set AT translation and disable irq */
	config = kbd_cmd_read(CMD_RD_CONFIG);
	if (config == -1)
		goto err;

	config |= CONFIG_AT_TRANS;
	config &= ~(CONFIG_KIRQ_EN | CONFIG_MIRQ_EN);
	if (kbd_cmd_write(CMD_WR_CONFIG, config))
		goto err;

	/* enable keyboard */
	if (kbd_write(I8042_CMD_REG, CMD_KBD_EN) ||
	    !kbd_input_empty())
		goto err;

	return 0;
err:
	debug("%s: Keyboard failure\n", __func__);
	return -1;
}

static int kbd_controller_present(void)
{
	return in8(I8042_STS_REG) != 0xff;
}

/*
 * Implement a weak default function for boards that optionally
 * need to skip the i8042 initialization.
 */
int __weak board_i8042_skip(void)
{
	/* As default, don't skip */
	return 0;
}

void i8042_flush(void)
{
	int timeout;

	/*
	 * The delay is to give the keyboard controller some time
	 * to fill the next byte.
	 */
	while (1) {
		timeout = 100;	/* wait for no longer than 100us */
		while (timeout > 0 && !(in8(I8042_STS_REG) & STATUS_OBF)) {
			udelay(1);
			timeout--;
		}

		/* Try to pull next byte if not timeout */
		if (in8(I8042_STS_REG) & STATUS_OBF)
			in8(I8042_DATA_REG);
		else
			break;
	}
}

int i8042_disable(void)
{
	if (kbd_input_empty() == 0)
		return -1;

	/* Disable keyboard */
	out8(I8042_CMD_REG, CMD_KBD_DIS);

	if (kbd_input_empty() == 0)
		return -1;

	return 0;
}

/* i8042_kbd_init - reset keyboard and init state flags */
int i8042_kbd_init(void)
{
	int keymap, try;
	char *penv;

	if (!kbd_controller_present() || board_i8042_skip()) {
		debug("i8042 keyboard controller is not present\n");
		return -1;
	}

	/* Init keyboard device (default US layout) */
	keymap = KBD_US;
	penv = getenv("keymap");
	if (penv != NULL) {
		if (strncmp(penv, "de", 3) == 0)
			keymap = KBD_GER;
	}

	for (try = 0; kbd_reset() != 0; try++) {
		if (try >= KBD_RESET_TRIES)
			return -1;
	}

	kbd_mapping = keymap;
	kbd_flags   = NORMAL;
	kbd_state   = 0;
	kbd_led_set();

	return 0;
}

/*
 * i8042_tstc - test if keyboard input is available
 *
 * option: cursor blinking if called in a loop
 */
int i8042_tstc(struct stdio_dev *dev)
{
	unsigned char scan_code = 0;

	if ((in8(I8042_STS_REG) & STATUS_OBF) == 0) {
		return 0;
	} else {
		scan_code = in8(I8042_DATA_REG);
		if (scan_code == 0xfa)
			return 0;

		kbd_conv_char(scan_code);

		if (kbd_input != -1)
			return 1;
	}

	return 0;
}

/*
 * i8042_getc - wait till keyboard input is available
 *
 * option: turn on/off cursor while waiting
 */
int i8042_getc(struct stdio_dev *dev)
{
	int ret_chr;
	unsigned char scan_code;

	while (kbd_input == -1) {
		while ((in8(I8042_STS_REG) & STATUS_OBF) == 0) {
		}
		scan_code = in8(I8042_DATA_REG);
		if (scan_code != 0xfa)
			kbd_conv_char(scan_code);
	}
	ret_chr = kbd_input;
	kbd_input = -1;

	return ret_chr;
}