/*
 * This program locates a CP2102 device via libusb, reads its internal
 * 1024-byte EEPROM and writes (into a file) an image of this EEPROM
 * in the same Intel HEX format as used by cp210x-program-1.0,
 * the Python-language tool from 2014.
 */

#include <sys/types.h>
#include <string.h>
#include <strings.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <usb.h>
#include "../libuwrap/find_dev.h"
#include "cp210x_defs.h"

extern struct usb_device *find_cp2102_device();

u_char eeprom[SIZE_EEPROM];
char *device_selector, *outfilename;

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':
			device_selector = optarg;
			continue;
		default:
		usage:
			fprintf(stderr,
			"usage: %s [-d device-selector] output-hex-file\n",
				argv[0]);
			exit(1);
		}
	}
	if (argc != optind + 1)
		goto usage;
	outfilename = argv[optind];
}

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

	process_cmdline(argc, argv);
	dev = find_cp2102_device(device_selector);
	usbh = usb_open(dev);
	if (!usbh) {
		fprintf(stderr, "error: usb_open() failed\n");
		exit(1);
	}
	read_eeprom(usbh);
	usb_close(usbh);
	outf = fopen(outfilename, "w");
	if (!outf) {
		perror(outfilename);
		exit(1);
	}
	intel_hex_out(eeprom, outf);
	fclose(outf);
	exit(0);
}