#include <sys/param.h>
#include <fcntl.h>
#include <stdio.h>
#include <err.h>

#include "/sys/dev/iicbus/iic.h"
#define EEPROM_WR_ADDR	0xA0
#define EEPROM_RD_ADDR	0xA1
#define COUNT		256

int
main(int argc, char **argv)
{
	int fd, ifd;
	struct iiccmd cmd;
	char data[256];
	char buf[16];
	int i;

	if (argc != 3)
		errx(1, "Usage: %s <iic device> <datafile>", argv[0]);
	if ( (fd = open(argv[1], O_RDWR)) < 0)
		err(1, "Opening device: %s", argv[1]);
	if ( (ifd = open(argv[2], O_RDONLY)) < 0)
		err(1, "Opening file: %d", argv[2]);
	if (read(ifd, data, 256) != 256)
		err(1, "Error reading input data");
	if (ioctl(fd, I2CRSTCARD, &cmd) != 0)
		err(1, "Ioctl I2CRSTCARD error");

	for (i = 0; i < 256; ++i) {
		/* WRITE 0*/
		cmd.slave = EEPROM_WR_ADDR;
		cmd.count = 1;
		cmd.buf = buf; 
		cmd.last = 0;
		buf[0] = buf[1] = buf[2] = buf[3] = 0;
		if (ioctl(fd, I2CSTART, &cmd) != 0)
			err(1, "Ioctl I2CSTART error");

		cmd.slave = EEPROM_WR_ADDR;
		cmd.count = 2;
		buf[0] = i; 
		buf[1] = data[i];
		cmd.buf = buf; 
		cmd.last = 0;
		if (ioctl(fd, I2CWRITE, &cmd) != 0)
			err(1, "Write Error");
		if (ioctl(fd, I2CSTOP) != 0)
			err(1, "Ioctl I2CSTOP error");
		usleep(100000);
		printf("Writing byte: %d\n", i);
	}
	return 0;
}