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

[juuso.alasuutari@tamperelainen.org]

> > How can I tell udev to modprobe <module> only if <module> exists and hasn't
> been
> > compiled in the kernel? In my experience modules are visible to udev only
> when
> > and after they are loaded, which makes finding a solution to my problem a
> bit
> > of a paradox.
>
> Look in /sys/module/  That will have the module name if the module is
> loaded _or_ if the module is built into the kernel.
>
> If it's not there, then it should be safe to load it.

Thanks, that helped a lot. I wrote the following rules for snd_pcm_oss and rtc
based on your hint:

# Load ALSA OSS emulation sound module if not already loaded.
KERNEL!="snd_pcm_oss", SUBSYSTEM!="module", ACTION="add", RUN+="/sbin/modprobe
snd_pcm_oss"

# Load real time clock module if not already loaded.
KERNEL!="rtc", SUBSYSTEM!="module", RUN+="/sbin/modprobe rtc"

They work at least when running udevstart in console, haven't yet rebooted.
One thing bugs me, though. I tried to be smart and make it so that snd_pcm_oss
wouldn't try to load unless snd_pcm was loaded, but snd_pcm_oss refused to load
altogether. Here's what I wrote:

KERNEL!="snd_pcm", SUBSYSTEM!="module", GOTO="bypass_oss"
KERNEL!="snd_pcm_oss", SUBSYSTEM!="module", ACTION="add", RUN+="/sbin/modprobe
snd_pcm_oss"
LABEL="bypass_oss"

What might be wrong with it?

Juuso

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