Re: Evdev uniq id

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Hi Russell,

On Fri, Nov 05, 2010 at 03:42:19PM +1100, Russell Shaw wrote:
> Hi,
> In X, i want an application program to apply settings to a specific
> mouse/puck device, regardless of how many other devices have been
> plugged in since the last session.
> 
> Prefereably, a manufacturer-model-serial_number call would be available
> from evdev.
> 
> Minimally, a uniq non-changing ID could be useful. I found this in
> linux-2.6.31.1/drivers/input/evdev.c:
> 
>   if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
>     return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
> 
> How is "dev->uniq" constructed?

USB HID devices populate this field with data from descriptor.iSerialNumber.
I suppose we should do that in other USB drivers as well, patches are
welcome.

Thanks.

-- 
Dmitry
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