Re: [PATCH] ACPI: add "Fujitsu laptop extras" module

[Len Brown <lenb@kernel.org>]

On Thursday 23 August 2007 23:15, Jonathan Woithe wrote:
> > Oh, i forgot to mention also...
> > There should be no new files created under /proc/acpi
> > for platform specific drivers.
> 
> Sure.  In the case of the backlight control (which is the thing I most care
> about) this will be taken care of by virue of utilising the backlight class
> as per Matthew's email.  If it did prove useful to export the mouse pointer
> control for example (which at this stage is uncertain) what would be the
> most appropriate location for the associated virtual files - something under
> /sys?

yes, certainly something outside of /proc.
ideally something _generic_ under /sys.
If device specific and the device exists in sysfs already, then there.
But there can be platform specific hooks in sysfs too.
thinkpad-acpi stuffs some platform specific junk under /sys/devices/platform/
see Documentation/thinkpad-acpi.txt

your fujitsu driver will probably be a lot like the msi-laptop.c driver
when you're done with it, maybe even simpler.

cheers,
-Len