On Tue, 30 May 2000, Johannes Erdfelt wrote:
> > So I'm wondering how to get full topology information by reading
> > (or ioctl?) individual device nodes (bus#/dev#), but it looks to me
> > (in 2.4.0-test1) that a read will only get the (binary) device
> > descriptor. I saw a post by Johannes Erdfelt stating that the config
> > descriptors should follow the device descriptor (do they?).
>
> This was part of a recent patch. The patch is not in 2.4.0-test1.
Sweet, I'll get pre-10...
> > After that, do I have to talk to
> > the device to get interface and endpoint descriptors?
>
> Those are interleaved in the config descriptors.
Sweet again.
> > I see in devices.c
> > you are getting the info from struct usb_bus which has usb_devices,
> > etc... if these are cached (by the USB subsystem?) wouldn't it be
> > better to allow access (to the descriptors, not the structs) from
> > devio.c? If not then won't there be problems reading them when an
> > interface is claimed (by another driver)...? I was thinking possibly
> > a read could return all the info that's in the 'devices' file (for the
> > particular device being read)?
>
> I'm not sure what you mean by this.
Never mind you already answered my question.
> My last patch adds most of the rest of the information to usbdevfs. It
> does not add topology information yet, however David Brownell has some
> ideas on how to do that. I'm sure some patches will be developed in the
> next couple of days.
As long as I can get all the descriptor info I can do the topology no
problem (assuming the parent hub is somewhere in the info...?)
> > Oh - as a side note, I saw a lot (a LOT) of discussion on linux-usb
> > about moving usbdevfs completely to devfs...? Is this so, and does
> > that mean it will not work as a mountable fs anymore?
>
> It would implicitility be mounted since it would be part of devfs. The
> patch completely removes the VFS portion of usbdevfs in favor of using
> devfs. If you have devfs mounted, then /dev/usb would just appear.
So, this means I *must* use devfs...
> Unfortunately, not everyone wants this patch.
I think getting all descriptor info is great; moving usbdevfs completely
to devfs tho...
I'm just wondering if it's possible to leave the VFS
temporarily, or possibly have devfs and VFS access...?
No a big deal tho. I can move to devfs without complaint.
--
Dan Streetman
[EMAIL PROTECTED]
---------------------
186,272 miles per second:
It isn't just a good idea, it's the law!
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
