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/* this is both a PS/2 keyboard driver */
#include <stdint.h>
#include <stdio.h>
#include "io.h"
#include "isr.h"
#include "ps2kbd.h"
#include "ps2_keymaps.h"
static void ps2_wait(void)
{
/* wait for the keyboard */
while(1)
if ((inb(0x64) & 2) == 0) break;
}
void ps2kbd_set_leds(uint8_t status)
{
ps2_wait();
outb(0x60, 0xED);
outb(0x60, status);
}
#define IDX_UP 0
#define IDX_LEFT 1
#define IDX_DOWN 2
#define IDX_RIGHT 3
static uint8_t ps2_arrowkeys[4];
uint8_t ps2kbd_button_get(void)
{
uint8_t ret = 0;
if(ps2_arrowkeys[IDX_UP])
ret |= BUTTON_UP;
if(ps2_arrowkeys[IDX_LEFT])
ret |= BUTTON_LEFT;
if(ps2_arrowkeys[IDX_DOWN])
ret |= BUTTON_DOWN;
if(ps2_arrowkeys[IDX_RIGHT])
ret |= BUTTON_RIGHT;
return ret;
}
static void key_handler(struct regs_t *regs)
{
(void) regs;
uint8_t scancode = inb(0x60);
switch(scancode)
{
/* ... the only one we care about! */
case 0xE0:
{
uint8_t spec = inb(0x60);
switch(spec)
{
case 0x48:
ps2_arrowkeys[IDX_UP] = 1;
break;
case 0x4B:
ps2_arrowkeys[IDX_LEFT] = 1;
break;
case 0x50:
ps2_arrowkeys[IDX_DOWN] = 1;
break;
case 0x4D:
ps2_arrowkeys[IDX_RIGHT] = 1;
break;
case 0xC8:
ps2_arrowkeys[IDX_UP] = 0;
break;
case 0xCB:
ps2_arrowkeys[IDX_LEFT] = 0;
break;
case 0xD0:
ps2_arrowkeys[IDX_DOWN] = 0;
break;
case 0xCD:
ps2_arrowkeys[IDX_RIGHT] = 0;
break;
}
break;
}
default:
break;
}
}
static void ps2_set_scancode_set(uint8_t set)
{
ps2_wait();
outb(0x60, 0xF0);
outb(0x60, set);
}
static void keyboard_init(void)
{
set_interrupt_handler(IRQ(1), key_handler);
ps2_set_scancode_set(1);
}
void ps2kbd_init(void)
{
keyboard_init();
}
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