On Thu, Sep 9, 2010 at 11:21, Ludovic Rousseau
<ludovic.rousseau@xxxxxxxxx> wrote:
> I am trying to write a udev configuration file to change the group
> ownership of the device if the device contains a CCID interface
> (bInterfaceClass = 11 or 0x0B).
>
> I would like to use something like:
> ATTR{bInterfaceClass}=="0b", GROUP="pcscd"
> but that does not work.
That not possible. Udev can only match on properties of the device
ATTR or a parent device ATTRS.
The device node you want to set the group to is the usb_device, but
the match you want to do is on the usb_interface. At the moment the
usb_device event is handled, the usb_interface does not exist, so this
can never match. And from the usb_interface, which is a children and
comes after the usb_device, you can not change the parent device node.
Udev parses the usb descriptors and makes them available in a
property. That's the only way to access usb_interface properties from
the usb_device event.
Something like:
SUBSYSTEM=="usb", ENV{ID_USB_INTERFACES}="*:0b0000:*", GROUP= ...
should do it.
Kay
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