On Sun, Jan 23, 2005 at 01:13:01PM +0100, Juergen Kreileder wrote:
> Sven Luther <[EMAIL PROTECTED]> writes:
>
> > On Sun, Jan 23, 2005 at 12:37:50PM +0100, Juergen Kreileder wrote:
> >> It's a via-pmu:
> >
> > Ok, so where is the problem ? The /dev/pmu stuff would be accessible
> > in acme/control-center/whatever-it-is, nd everyone will be happy ?
> > Unless you are telling me that you don't have blacklight control for
> > this one ?
>
> It doesn't have a backlight control.
Ok.
> > Ah. So, you are not using a debian kernel, and there is no reason to
> > support you at all :)
>
> Hehe :-)
> (Using the kernel provided by Debian would mean wasting 2GB of memory
> on my machine.)
So you are using a 64bit kernel, or is there anything else in particular you
have a problem with ?
> > Well, we need to test this from userland, not kernelland.
>
> It shouldn't be too hard to find "backlight" in device-tree.
Indeed.
/me boots my ibook to check ...
Mmm, indeed. The following alogirthm is a rafinement of the current setup in
CVS :
1) if there is no /proc/device-tree/aliases/via-pmu, we quit.
2) if there is no /proc/device-tree/aliases/mac-io (should never be the case
if there is a via-pmu i think), we quit too.
3) if there is no /proc/device-tree/`cat
/proc/device-tree/aliases/mac-io`/backlight
we quit too, since there is no fblevel stuff available in /dev/pmu.
=> obvious problem is if there is a backlight without via-pmu, or if the
backlight is not on node mac-io. I doubt this happens for now, and we
can fix those cases later if they show up.
And then, we continue with the normal stuff :
4) if there is no /dev/pmu, we warn the user silently and quit.
5) if /dev/pmu is not writable, we warn the user silently, and quit.
6) if it passes upto here, we do the fblevel stuff.
7) we add a mention to the above in README.Debian, including an example on
how to make /dev/pmu usable with and without udev. Also a warning on the
security risks involved.
Does this sound acceptable ?
> >> ,----
> >> | bk_node = find_devices("backlight");
> >
> > Ok, so there is maybe a blacklight device somewhere in /proc/devices
> > ?
>
> Yes. (At least I think so, I only have one machine and that doesn't
> have any backlight control.)
Ok.
> > But these don't have a /dev/pmu ? Or do they have it ?
>
> via-pmu.c uses register_backlight_controller from pmac_backlight.c, so
> this should cover machines with via-pmu.
Indeed.
Friendly,
Sven Luther
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