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u-boot/drivers/input/i8042.c
Simon Glass c5d257f93f i8042: Adjust keyboard init to assume success 
Modify i8042_kbd_init() so that the normal pass is sucessful init and
failure exits early. This will make the code easier to extend and is easier
to read.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2015-11-19 20:13:40 -07:00

647 lines
20 KiB
C
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/*
* (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;
}
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