Re: How to check if driver is in-built or module?

[Andrey Borzenkov <arvidjaar@mail.ru>]

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On Tuesday 07 March 2006 02:45, juuso.alasuutari@tamperelainen.org wrote:
> Quoting Marco d'Itri <md@Linux.IT>:
> > These modules are not being loaded automatically because they lack the
> > needed aliases. I added these to the debian package:
> >
> > alias pnp:dPNP0510 irtty-sir
> > alias pnp:dPNP0511 irtty-sir
> > alias pnp:dPNP0700 floppy
> > alias pnp:dPNP0800 pcspkr
> > alias pnp:dPNP0b00 rtc
> > alias pnp:dPNP0303 atkbd
> > alias pnp:dPNP0f13 psmouse
> > alias pnp:dPNPb02f analog
> >
> > And then I use this rule:
> >
> > SUBSYSTEM="pnp",       ENV{MODALIAS}!="?*",    RUN+="/bin/sh -c 'while
> > read id; do /sbin/modprobe pnp:d$$id; done < /sys$devpath/id'"
> >
> > It's still not perfect, drivers which have card PNP aliases do not
> > export them to sysfs.
>
> Where do those "alias ..." lines go exactly?
>

/etc/modprobe.conf I assume

> How did hotplug manage to load these modules without them having aliases,
> by the way? 

It could have some built-in list of modules. 

> And are there any tools for finding out what modules lack this 
> necessary info, except hands-on experimentation?
>

I doubt it. If you know that device has PNP id and know its driver, check for 
existence of MODULE_DEVICE_TABLE(pnp,...). If it is missing, driver does not 
export PNP IDs it supports and no module aliases are created.

> What would it take to make these kind of special arrangements unnecessary?
> On what level would the changes have to happen? In udev, or in the kernel
> perhaps? In whose court is the ball on this matter?
>

This is kernel issue. And adding ID table is not enough because PNP subsystem 
does not support modalias (at least here, 2.6.15.6, it is missing). So you 
still need the above hack even if module properly defines aliases.

- -andrey
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