/*
 * This program connects to an FTDI chip via libusb and commands that FTDI
 * chip to erase its EEPROM in one fell swoop.  This operation is known
 * to work on FT2232C/D chips with 5V-powered EEPROMs, but is NOT appropriate
 * for FT232R.  This operation is also not recommended for external EEPROMs
 * powered with 3.3V, as typically used with FT2232H.
 *
 * The present version has been converted to use our local libraries
 * (libftmini and libuwrap) instead of libftdi - thus the external dependency
 * is only libusb.
 */

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <usb.h>
#include "../libuwrap/find_dev.h"
#include "../libuwrap/open_close.h"
#include "../libftmini/eeprom_func.h"

char *device_selector;
int detach_num;

process_cmdline(argc, argv)
	char **argv;
{
	int c;
	extern int optind;
	extern char *optarg;

	while ((c = getopt(argc, argv, "d:")) != EOF) {
		switch (c) {
		case 'd':
			detach_num = atoi(optarg);
			switch (detach_num) {
			case 0:
			case 1:
			case 2:
			case 4:
				break;
			default:
				fprintf(stderr, "error: invalid -d argument\n");
				exit(1);
			}
			continue;
		default:
			/* error msg already printed */
			exit(1);
		}
	}
	if (argc != optind + 1) {
		fprintf(stderr, "usage: %s [options] device-selector\n",
			argv[0]);
		exit(1);
	}
	device_selector = argv[optind];
}

main(argc, argv)
	char **argv;
{
	struct usb_device *dev;
	usb_dev_handle *usbh;

	process_cmdline(argc, argv);
	dev = find_usbdev_by_desc_string(device_selector);
	if (!dev) {
		fprintf(stderr, "error: specified USB device not found\n");
		exit(1);
	}
	usbh = usb_open(dev);
	if (!usbh) {
		fprintf(stderr, "error: usb_open() failed\n");
		exit(1);
	}
	if (detach_num)
		usbwrap_claim_all_ifs(usbh, detach_num);
	ftmini_erase_eeprom(usbh);
	usb_close(usbh);
	exit(0);
}