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The LED interface is a simple bit-banging affair. I've uploaded two code fragments that will allow you to control the LEDs on the front from linux. When I have time I'll comment it. :)
#define LED_NONE 0
#define LED_BLUE 0x01
#define LED_RED_1 0x02
#define LED_RED_2 0x04
#define LED_RED_3 0x08
#define LED_GREEN 0x10
#define LED_ALL LED_BLUE|LED_RED_1|LED_RED_2|LED_RED_3|LED_GREEN
//######################################
//Common Code
//#####################################
static void write_address(char addr,char val){
outb_p(addr,0x2e);
outb_p(val,0x2f);
}
static int read_address(char addr){
char res;
outb_p(addr,0x2e);
res = inb_p(0x2f);
return res;
}
static void enter_handler(void){
outb_p(0x87,0x2e);
outb_p(0x01,0x2e);
outb_p(0x55,0x2e);
outb_p(0x55,0x2e);
}
static void exit_handler(void){
outb_p(0x02,0x02);
}
//###############################
//Common Code Ends...
//###############################
//#############################################
// LED Code
//#############################################
static void init_leds(void){
enter_handler();
write_address(7,7);
write_address(0x26,0x1f);
write_address(0xb1,LED_NONE);
exit_handler();
}
static void set_led(char ledmask){
enter_handler();
write_address(7,7);
write_address(0xb1,ledmask);
exit_handler();
}
//#######################################
// LED Code Ends
//#######################################
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