linux-kernel - Re: char/tpm: tpm_infineon no longer loaded for HP 2510p laptop

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Message-Id: <200808220606.39722.bjorn.helgaas@hp.com>
Date:	Fri, 22 Aug 2008 06:06:39 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	ambx1@....rr.com, elendil@...net.nl, trenn@...e.de,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	tpm@...horst.net, rjw@...k.pl, greg@...ah.com
Subject: Re: char/tpm: tpm_infineon no longer loaded for HP 2510p laptop

On Friday 22 August 2008 2:40:46 am Kay Sievers wrote:
> On Thu, 2008-08-21 at 15:58 -0600, Bjorn Helgaas wrote:
> > On Thursday 21 August 2008 03:18:33 pm Kay Sievers wrote:
> > > Bjorn Helgaas wrote:
> > > >Is there a "complete idiot's guide to modules
> > > >and udev"?  There's precious little in Documentation/ other than a
> > > > bunch of sample rules for various subsystems.
> > >
> > > I don't know of any specific documentation, but it's pretty easy:
> > > ...
> >
> > Thanks for the tutorial.
> >
> > > >Could I fix this by implementing pnp_device_uevent()?
> > >
> > > Only if we change the format of the current pnp device aliases
> > > to something like:
> > >   pnp*:XYZ2324:*
> > >   pnp*:ABC1234:*
> > >
> > > and create a "modalias" file at every pnp device, and add MODALIAS to
> > > the uevent. The modalias must contains all ID's which belong to that
> > > device in one single string, separated and terminated by a special
> > > character, something like:
> > >   pnp:ABC1234:XYZ2324:RST3445:
> >
> > This all sounds like good stuff that I'd like PNP to have.  Is there
> > any reason I shouldn't implement pnp_device_uevent()?  Any backwards-
> > compatibility issues?
>
> Yeah, people probably use the current aliases in modprobe.conf files,
> I'm not sure, if we can change them.
>
> > I think that sounds like a better solution than doing this PNP ID
> > mangling.
>
> Sure, that will go with the acpi aliases + acpi modalias, or if you
> change pnp to have proper pnp aliases + pnp modalias, then with them,
> yes.

Since PNP currently doesn't generate any uevents or modalias files,
I expect that a non-ACPI system will be unable to autoload modules
for ISAPNP or PNPBIOS devices.  Right?

Bjorn
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