/*
 * Overlayswap userspace utility
 *
 * Copyright (C) 2010 Texas Instruments
 *
 * Author: David Anders <x0132446@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

FILE *fp_display0_enb;
FILE *fp_display1_enb;
FILE *fp_overlay0_enb;
FILE *fp_overlay0_man;

void switch_to_hdmi(void)
{
	char set_value[5]; 

	rewind(fp_display1_enb);
	strcpy(set_value,"0");
	fwrite(&set_value, sizeof(char), 1, fp_display1_enb);

	rewind(fp_overlay0_enb);
	strcpy(set_value,"0");
	fwrite(&set_value, sizeof(char), 1, fp_overlay0_enb);

	rewind(fp_overlay0_man);
	strcpy(set_value,"tv");
	fwrite(&set_value, sizeof(char), 2, fp_overlay0_man);

	rewind(fp_overlay0_enb);
	strcpy(set_value,"1");
	fwrite(&set_value, sizeof(char), 1, fp_overlay0_enb);

	rewind(fp_display0_enb);
	strcpy(set_value,"1");
	fwrite(&set_value, sizeof(char), 1, fp_display0_enb);
}

void switch_to_2lcd(void)
{
	char set_value[5]; 

	rewind(fp_display0_enb);
	strcpy(set_value,"0");
	fwrite(&set_value, sizeof(char), 1, fp_display0_enb);

	rewind(fp_overlay0_enb);
	strcpy(set_value,"0");
	fwrite(&set_value, sizeof(char), 1, fp_overlay0_enb);

	rewind(fp_overlay0_man);
	strcpy(set_value,"2lcd");
	fwrite(&set_value, sizeof(char), 4, fp_overlay0_man);

	rewind(fp_overlay0_enb);
	strcpy(set_value,"1");
	fwrite(&set_value, sizeof(char), 1, fp_overlay0_enb);

	rewind(fp_display1_enb);
	strcpy(set_value,"1");
	fwrite(&set_value, sizeof(char), 1, fp_display1_enb);
}


int main(int argc, char** argv)
{
	//create a variable to store whether we are sending a '1' or a '0'
	char set_value[6]; 
	//Integer to keep track of whether we want on or off
	int toggle = 0;
	int retval = 0;

	if (argc == 2){
	    strcpy(set_value,argv[1]);
	}
	else {
		if ((fp_display0_enb = fopen("/sys/devices/platform/omapdss/display0/enabled", "rb+")) == NULL)
		{
		    printf("Cannot open display0-enb file.\n");
		    goto fail;
		}
		
		rewind(fp_display0_enb);
		fread(&set_value, sizeof(char), 1, fp_display0_enb);
		if (set_value[0] == '1')
		    retval=1;
		else
		    retval=0;
		
		goto fail1;
	}
	if ((fp_display0_enb = fopen("/sys/devices/platform/omapdss/display0/enabled", "rb+")) == NULL)
	{
		printf("Cannot open display0-enb file.\n");
		goto fail;
	}

	if ((fp_display1_enb = fopen("/sys/devices/platform/omapdss/display1/enabled", "rb+")) == NULL)
	{
		printf("Cannot open display1-enb file.\n");
		goto fail1;
	}

	if ((fp_overlay0_enb = fopen("/sys/devices/platform/omapdss/overlay0/enabled", "rb+")) == NULL)
	{
		printf("Cannot open overlay0-enb file.\n");
		goto fail2;
	}

	if ((fp_overlay0_man = fopen("/sys/devices/platform/omapdss/overlay0/manager", "rb+")) == NULL)
	{
		printf("Cannot open overlay0-man file.\n");
		goto fail3;
	}

	if (!strcmp(set_value,"tv")){
	    switch_to_hdmi();
	    retval=1;
	}
	else if (!strcmp(set_value,"2lcd")){
	    switch_to_2lcd();
	    retval=0;
	}
	else
	    printf("unknown overlay!\n");

	fclose(fp_overlay0_man);
fail3:
	fclose(fp_overlay0_enb);
fail2:
	fclose(fp_display1_enb);
fail1:
	fclose(fp_display0_enb);
fail:
	return retval;


}