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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <libpayload.h>
#define I8042_CMD_READ_MODE 0x20
#define I8042_CMD_WRITE_MODE 0x60
#define I8042_MODE_XLATE 0x40
unsigned char map[2][0x57] = {
{
0x00, 0x1B, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x30, 0x2D, 0x3D, 0x08, 0x09,
0x71, 0x77, 0x65, 0x72, 0x74, 0x79, 0x75, 0x69,
0x6F, 0x70, 0x5B, 0x5D, 0x0A, 0x00, 0x61, 0x73,
0x64, 0x66, 0x67, 0x68, 0x6A, 0x6B, 0x6C, 0x3B,
0x27, 0x60, 0x00, 0x5C, 0x7A, 0x78, 0x63, 0x76,
0x62, 0x6E, 0x6D, 0x2C, 0x2E, 0x2F, 0x00, 0x2A,
0x00, 0x20,
},
{
0x00, 0x1B, 0x21, 0x40, 0x23, 0x24, 0x25, 0x5E,
0x26, 0x2A, 0x28, 0x29, 0x5F, 0x2B, 0x08, 0x00,
0x51, 0x57, 0x45, 0x52, 0x54, 0x59, 0x55, 0x49,
0x4F, 0x50, 0x7B, 0x7D, 0x0A, 0x00, 0x41, 0x53,
0x44, 0x46, 0x47, 0x48, 0x4A, 0x4B, 0x4C, 0x3A,
0x22, 0x7E, 0x00, 0x7C, 0x5A, 0x58, 0x43, 0x56,
0x42, 0x4E, 0x4D, 0x3C, 0x3E, 0x3F, 0x00, 0x2A,
0x00, 0x20,
}
};
#define MOD_SHIFT 1
#define MOD_CTRL 2
#define MOD_CAPSLOCK 4
int keyboard_havechar(void)
{
unsigned char c = inb(0x64);
return c & 1;
}
unsigned char keyboard_get_scancode(void)
{
unsigned char ch = 0;
if (keyboard_havechar())
ch = inb(0x60);
return ch;
}
int keyboard_getchar(void)
{
static int modifier;
unsigned char ch;
int shift;
int ret = 0;
while (!keyboard_havechar()) ;
ch = keyboard_get_scancode();
switch (ch) {
case 0x36:
case 0x2a:
modifier &= ~MOD_SHIFT;
break;
case 0x80 | 0x36:
case 0x80 | 0x2a:
modifier |= MOD_SHIFT;
break;
case 0x1d:
modifier &= ~MOD_CTRL;
break;
case 0x80 | 0x1d:
modifier |= MOD_CTRL;
break;
case 0x3a:
if (modifier & MOD_CAPSLOCK)
modifier &= ~MOD_CAPSLOCK;
else
modifier |= MOD_CAPSLOCK;
break;
}
if (!(ch & 0x80) && ch < 0x57) {
shift =
(modifier & MOD_SHIFT) ^ (modifier & MOD_CAPSLOCK) ? 1 : 0;
ret = map[shift][ch];
if (modifier & MOD_CTRL)
ret = (ret >= 0x3F && ret <= 0x5F) ? ret & 0x1f : 0;
return ret;
}
return ret;
}
static int keyboard_wait_read(void)
{
int timeout = 10000;
while(timeout-- && !(inb(0x64) & 0x01))
udelay(50);
return (timeout <= 0) ? -1 : 0;
}
static int keyboard_wait_write(void)
{
int timeout = 10000;
while(timeout-- && (inb(0x64) & 0x02))
udelay(50);
return (timeout <= 0) ? -1 : 0;
}
static unsigned char keyboard_get_mode(void)
{
outb(I8042_CMD_READ_MODE, 0x64);
keyboard_wait_read();
return inb(0x60);
}
static void keyboard_set_mode(unsigned char mode)
{
outb(I8042_CMD_WRITE_MODE, 0x64);
keyboard_wait_write();
outb(mode, 0x60);
}
void keyboard_init(void)
{
u8 mode;
/* Read the current mode */
mode = keyboard_get_mode();
/* Turn on scancode translate mode so that we can
use the scancode set 1 tables */
mode |= I8042_MODE_XLATE;
/* Write the new mode */
keyboard_set_mode(mode);
}
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