[Nut-upsuser] Nut-upsuser Digest, Vol 36, Issue 5

[Alex Peyser]

It is possible at least on linux to get the port associated with a device from 
userspace - I'd assume that on each platform it's possible, just that libusb 
is incomplete (on top of being undocumented).

Here's a patch for matching portnum on linux, with a few pieces pulled from 
libusb. It lacks autoconf macros to isolate it -- but it does appear to work.

Regards,
Alex Peyser

On Friday 06 June 2008 05:55:04 am nut-upsuser-request at lists.alioth.debian.org 
>
> Message: 2
> Date: Fri, 6 Jun 2008 08:39:45 +0200 (CEST)
> From: "Arjen de Korte" <nut+users at de-korte.org>
> Subject: Re: [Nut-upsuser] Multiple ups/Belkin 1500VA no serial number
> To: "Alex Peyser" <a.peyser at umiami.edu>
> Cc: nut-upsuser at lists.alioth.debian.org
> Message-ID:
> 	<1056.193.67.155.121.1212734385.squirrel at mail.de-korte.org>
> Content-Type: text/plain;charset=iso-8859-1
>
> > I hadn't previously looked into libusb, but is there a reason why the
> > filename
> > member of usb_device is't matched on?  On linux, they may not be unique
> > or deterministic in theory --- but in practice they are, particularly for
> > servers where you're not constantly plugging in and out devices.
>
> The filename *will* change, even if you don't plug in and out devices.
> This may happen as often as once every half hour. Therefor, the device
> name can't be used in the matching. It may appear to work now, but if for
> some reason the devices are enumerated again, the connection *will* be
> lost.
>
> > Am I missing something in the logic, or do I just have an unusual case?
>
> Neither. These devices are just not suitable for use with NUT as long as
> the libusb library doesn't expose the physical ports the UPS is attached
> to.
>
> > I've written up a patch that works for me -- it pulls out the filename
> > from
> > the usb_device, and matches it with a file= parameter for ups.conf. I'd
> > guess
> > that a better long-term solution would be to have upsdrv listen to hal
> > for ups's that are connecting -- but that would obviously be a lot more
> > work, and
> > it requires mucking up the server with hal stuff.
>
> We already have HAL enabled drivers, but I'm not sure if these use all the
> information from HAL to match a UPS or if they need the devices to be
> 'unique' as well (like the classic ones).
>
> Best regards, Arjen
> --
> Eindhoven - The Netherlands
> Key fingerprint - 66 4E 03 2C 9D B5 CB 9B  7A FE 7E C1 EE 88 BC 57
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