On Wed, Mar 18, 2009 at 10:48, Marco d'Itri <md@xxxxxxxx> wrote:
> From: Phil Endecott <spam_from_debian_bugs_7@xxxxxxxxxxxx>
> I have a Griffin Powermate, which is a USB "knob" that can be used as
> e.g. a volume control, for scrolling through video/audio, etc. No
> /dev/input/by-* links are created for it. This is because
> persistent-input.rules only sets ENV{ID_CLASS} for keyboards and mice
> when it recognises them from their ATTRS{bInterfaceProtocol}. This
> device has ATTRS{bInterfaceProtocol}==0. I have added this, to give
> it class "misc"; I'm not sure if there is an official USB-spec-defined
> meaning for protocol==0 that I should be using:
>
> SUBSYSTEMS=="usb", \
> ATTRS{bInterfaceClass}=="03", ATTRS{bInterfaceProtocol}=="00", \
> ENV{ID_CLASS}="misc"
> I now get the desired symlinks:
>
> /dev/input/by-id/usb-Griffin_Technology,_Inc._Griffin_PowerMate-event-misc
> /dev/input/by-path/pci-0000:00:10.2-usb-0:1:1.0-event-misc
It's undefined if bInterfaceProtocol is 0.
What is the subclass value of the device? Like "lsusb -v" prints for a mouse:
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 1 Boot Interface Subclass
bInterfaceProtocol 2 Mouse
Thanks,
Kay
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