Re: [rfc] generic testing ACPI module

[Paul Ionescu <paul-f7LjuT9/YZU@public.gmane.org>]

Hi Pavel,

That should be ok.
For the long term, it sounds reasonable to do it this way if kernel
developers agree this usage of sysfs filesystem.
I just remembered one discution from last weeks, that files in sysfs
have to accept only one value, and output only one value (or something
like this).
I don't know if I got it right, but if this is the case, we should
either move this tree in /proc/acpi/somewhere, or create some other
files under each method like {parm1,parm2,parmN,result1,result2,resultN}
depending of what that particular method takes as arguments and values
it return.
Some locking mecanism should be used to be sure that only one program is
unsing it a a time.
Anyway, this will take time to implement it, but it may have a future.
What I am looking for right now, is to have a VERY SMALL module template
of an acpi driver for accessing a method with some parameters, and for
installing a notify handler on an object in order to receive some events
in acpid when that object receives a notify. And it should operate with
full path ACPI objects.

I don't even want it to be included in main kernel, it can live at acpi
site, like the patch for putting your own DSDT table in kernel.

I am willing to develop one, but I need a small template because I don't
know much about acpi in kernel, and I don't really have a lot of free
time to learn it.
But if a template would exist, it would be much easyer for me to just
modify it to suit my needs.




On Fri, 2004-03-12 at 21:59, Pavel Machek wrote:
> Hi!
> 
> > > But ioctls are even worse. Why not simply
> > > 	open METHOD
> > > 	write PARAMETERS
> > > 	read RESULTS
> > > 	close
> > > 
> > 
> > Because I'm too stupid to thing of your solution, I guess.
> 
> Well, instead of doing ioctls on special file, you can simply do
> write syscall (telling driver parameters for the method) then read
> syscall on same filedescriptor. That is not racy, and it is
> less hacky then ioctl()
> 				Pavel



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