fteeprom-{erase,prog}: detach logic: change to detach by default As it turns out, detaching all ttyUSB interfaces of a multichannel device does not require outside knowledge of how many channels there are, as in our previous -d option design that is being removed here - instead we can read the bNumInterfaces constant from the USB device's config descriptor and thus know how many interfaces there are in total. Based on this discovery, change the design of fteeprom-{erase,prog} as follows: * remove -d option; * flip the default to where we detach all interfaces by default; * add -n option to NOT detach any interfaces.

/*
 * This header file contains definitions and declarations related to
 * functions for locating specific FTDI/CP2102/etc USB devices.
 */

struct usbdev_matchspec {
	unsigned	usb_vid;
	unsigned	usb_pid;
	const char	*manuf_string;
	const char	*product_string;
	const char	*serial;
	unsigned	index;
};

extern struct usb_device *
find_usbdev_by_matchspec(const struct usbdev_matchspec *match);

extern struct usb_device *
find_usbdev_by_busdev(const char *bus_dev_spec);

extern struct usb_device *
find_usbdev_by_desc_string(const char *desc_string);