Re: USB Smart Card reader

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Feb 27, 2012 at 08:17:50PM +0000, James Courtier-Dutton wrote:
> On 25 February 2012 16:41, Greg KH <greg@kroah.com> 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
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