[sane-devel] USB probing

[Martin Jelínek]

Hi,

isn't this idea a bit obsolete with devfs, where the only authoritative
identification is a device filename (and major/minor numbers may be (in
future) changed dynamically) ?

Well this was non-constructive, but afaik for now, the historical majors are
used.

mates

--
Martin Jelínek <mates@amu.cz>, http://sirrah.troja.mff.cuni.cz/~mates/
	          Astronomický ústav AV ČR, Ondřejov

Karl Heinz Kremer, Mon Jan 14, 2002 at 01:09:
> You can get the major and minor device numbers from the device file.
> The major device number will tell you if it's a SCSI or an USB
> device.
> 
> Karl Heinz
> 
> Major A <andras@users.sourceforge.net> said:
> 
> > 
> > 
> > Hi,
> > 
> > I need some help from SANE developers:
> > 
> > Given a device file, how can I determine whether that is a generic
> > SCSI or a USB scanner device? It seems that when I try to open a USB
> > device file as a SCSI device and probe with INQUIRY, a USB timeout
> > will occur. I don't think using a generic SCSI device file with some
> > random USB scanner protocol is a good idea either.
> > 
> > So, is it possible to decide what interface the file stands for, or do
> > I have to judge from the filename (example: "usb:/dev/scanner")?
> > 
> > Thanks,
> > 
> >   Andras