On Mon, Feb 27, 2012 at 08:17:50PM +0000, James Courtier-Dutton wrote: > On 25 February 2012 16:41, Greg KH <greg@xxxxxxxxx> wrote: > > On Sat, Feb 25, 2012 at 10:01:17AM +0000, James Courtier-Dutton wrote: > >> Hi, > >> > >> I have done some development work on the iuu_phoenix.c driver in the > >> Linux kernel. > >> The iuu_phoenix is a smart card reader. > >> The smart card reader can be given a unique identification string of > >> 16 characters/hex bytes. This ID can be read when the card reader is > >> inserted into the USB port. > >> I would like to be able to set up device names in /dev so that when > >> inserting a card reader into the USB port, it always will appear withudev > >> the same unique name in /dev. > >> Similar to the by-uuid used for hard disk drives. > > > > Your distro should already have /dev/serial/ which provides this for you > > automatically. Have you used that and found it somehow lacking? > > > > My question is how to I get the card reader ID, that is going to be > read by a special usb request, to influence the name of the > /dev/serial device name. > If the first card reader has ID: 0001, and the second has the ID: > 0002. The IDs are programmed into the EEPROM of the card reader. I > would like the IDs to be passed to udev so that even if only one card > reader with ID:0002 is plugged in, it always gets the same name in > /dev/serial > The reason for this, is so that someone can look at the device name in > /dev/serial and then know exactly which physical device it applies to. If the card reader's "id" shows up in the serial number of the USB device, /dev/serial/ will reflect this in the naming of the symlinks it generates for the device. Try it and see :) greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
