#include "common.h"
#include "config.h"

static uint32_t curr_brightness;
static FILE*	backlight_fp;

void write_to_backlight(int brightness) {
	if (!backlight_fp) {
		backlight_fp = fopen(BACKLIGHT_FILE, "w");
	}

	fprintf(backlight_fp, "%d", brightness);
	fflush(backlight_fp);

	curr_brightness = brightness;
}

void backlight_on(void) {
	write_to_backlight(MAX_BRIGHTNESS);

	usleep(BACKLIGHT_TIME);
}

void backlight_off(void) {
	if (curr_brightness == 0) return;

	write_to_backlight(0);
}