Re: Consistant naming for LED class USB devices?

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On Fri, Feb 15, 2013 at 01:05:38PM -0500, simon@xxxxxxxxxxxxx wrote:
> No word from 'linux-input' so cross posting to 'linux-usb',
> Simon
> 
> --------------------------------------------------------------------------
> 
> Hi,
> I'm after naming suggestions for USB devices which use the LED class.
> 
> On one gaming wheel (Steelseries SWR-S1) I was able to use the serial
> number, however my other wheel (Logitech G27) does not have a unique
> serial (it reports '0').
> 
> The G27 (hid-lg4ff) driver's naming changes each time the wheel is
> unplugged/plugged.
> 
> It currently uses
> --
> snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
> --
> ie. "0003:046D:C294.0009::RPM1",  the '0009' will change each time.
> 
> 
> In the absence of a serial number, is there another method I could use
> which would allow multiple G27's to be connected to a system and still
> allow unique (but consistant) naming?

Use the USB "path" in the system to create a symlink to the device, much
like the /dev/serial/ symlinks are created in udev.

good luck,

greg k-h
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