#include <sys/ioctl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#define DCONIOC_SOURCE		_IOW('d', 0, int)
#define DCONIOC_OUTPUT		_IOW('d', 1, int)
#define DCONIOC_SETREG		_IOW('d', 2, int)
#define DCONIOC_DUMPREG		_IOW('d', 3, int)
#define DCONIOC_GETREG		_IOW('d', 4, int)

int main(int argc, char **argv)
{
	int fd;
	int cmd, arg;

	if (argc < 2) {
	usage:
		printf("Usage: %s (source|output) (0|1)\n", argv[0]);
		return 1;
	}
	if (!strcasecmp(argv[1], "source"))
		cmd = DCONIOC_SOURCE;
	else if (!strcasecmp(argv[1], "output")) 
		cmd = DCONIOC_OUTPUT;
	else if (!strcasecmp(argv[1], "setreg")) 
		cmd = DCONIOC_SETREG;
	else if (!strcasecmp(argv[1], "dumpreg")) 
		cmd = DCONIOC_DUMPREG;
	else if (!strcasecmp(argv[1], "getreg")) 
		cmd = DCONIOC_GETREG;
	else goto usage;

	if (cmd != DCONIOC_DUMPREG) {
		if (argc < 3)
			goto usage;
		arg = strtol(argv[2], NULL, 0);
	}
	if (cmd == DCONIOC_SETREG) {
		if (argc != 4) {
			printf("Need arg, val\n");
			return 1;
		}
		arg <<= 16;
		arg += strtol(argv[3], NULL, 0);
	}

	fd = open("/dev/fb", O_RDWR);
	if (fd < 0) {
		perror("open");
		return 1;
	}

	if (ioctl(fd, cmd, &arg) < 0)
		perror("ioctl");
	else if (cmd == DCONIOC_SOURCE || cmd == DCONIOC_OUTPUT ||
		 cmd == DCONIOC_GETREG)
		printf("Result: %d 0x%x\n", arg, arg);

	return arg;
}