Re: Mapping a usbfs device to the corresponding sysfs device.

[Greg KH <greg@xxxxxxxxx>]

On Sun, Jul 29, 2007 at 02:17:31AM -0400, Dave Mielke wrote:
> [quoted lines by Greg KH on 2007/07/28 at 23:04 -0700]
> 
> >It's easier to go from a sysfs device to a usbfs device, but I don't
> >understand the question really.  You want to know how to do it on newer
> >kernels but not older ones?  The mapping is still the same, nothing has
> >changed, you can still just look up the bus and device number from the
> >usbfs name and then walk sysfs to get the device.  That will work with
> >all kernel versions, right?
> 
> Yes, I suppose so, but we used to be able to go directly to it via 
> /sys/class/usb_device/usbdev<bus>.<dev>. Is there a reason that's gone 
> away (without special configuration)? Without it our code needs to become more
> complex, which is always something I'd rather avoid.

There is a kernel configuration option to retain this if you really need
it.  Right now the information is already availble in sysfs in a
different location (/sys/bus/usb/devices) so having this is redundant.

And yes, you can use /sys/bus/usb/devices on older kernels as well.

thanks,

greg k-h

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