--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cp2102/update_eeprom.c	Thu Sep 28 05:25:39 2023 +0000
@@ -0,0 +1,78 @@
+/*
+ * This program locates a CP2102 device via libusb, reads its internal EEPROM,
+ * applies user-requested patches to the EEPROM image, and then reprograms
+ * the physical EEPROM with the patched version.
+ */
+
+#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 "../libuwrap/open_close.h"
+#include "cp210x_defs.h"
+
+extern struct usb_device *find_cp2102_device();
+
+u_char eeprom[SIZE_EEPROM];
+char *device_selector, *baud_change;
+int no_detach;
+
+process_cmdline(argc, argv)
+	char **argv;
+{
+	int c;
+	extern int optind;
+	extern char *optarg;
+
+	while ((c = getopt(argc, argv, "b:d:n")) != EOF) {
+		switch (c) {
+		case 'b':
+			baud_change = optarg;
+			continue;
+		case 'd':
+			device_selector = optarg;
+			continue;
+		case 'n':
+			no_detach = 1;
+			continue;
+		default:
+		usage:
+			fprintf(stderr,
+				"usage: %s [hw-options] eeprom-changes\n",
+				argv[0]);
+			exit(1);
+		}
+	}
+	if (argc == optind && !baud_change)
+		goto usage;
+}
+
+main(argc, argv)
+	char **argv;
+{
+	struct usb_device *dev;
+	usb_dev_handle *usbh;
+	extern int optind;
+
+	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);
+	if (baud_change)
+		apply_eeprom_patch_baud(baud_change);
+	for (; optind < argc; optind++)
+		apply_eeprom_patch_file(argv[optind]);
+	if (!no_detach)
+		usbwrap_claim_all_ifs(usbh);
+	write_eeprom(usbh);
+	usb_close(usbh);
+	exit(0);
+}