Re: pxaregs and backlight control

whoa, that was insanely easy. I've posted the driver here:

http://axim.openfbo.com/kernel/backlight/

Control the backlight by writing to:

/sys/class/backlight/corgi-bl/brightness

e.g.

for i in `seq 0 10 1030`; do echo $i >
/sys/class/backlight/corgi-bl/brightness ; usleep 100; done

Cheers,
Matt

On 3/14/07, Matt Barclay <mbarclay_at_gmail.com> wrote:
> There is a backlight controller interface and drivers in:
>
> drivers/video/backlight/
>
> Actually, it looks like h2200_bl.c is very close to what the aximx50
> needs. I'm playing with it right now...
>
> On 3/14/07, Patrick Steiner <patrick.steiner_at_a1.net> wrote:
> > On Wednesday, 14. March 2007 20:32:05 Matt Barclay wrote:
> > > Hello,
> > >
> > > pxaregs is a tool for reading and setting PXA2xx registers. It
> > > originally comes from here:
> > >
> > > http://www.mn-logistik.de/unsupported/pxa250/
> > >
> > > I've modified it slightly to compile with the angstrom gcc 4.1.1
> > > compiler. The source can be found here:
> > >
> > > http://axim.openfbo.com/pxaregs.c
> > >
> > > And a binary here:
> > >
> > > http://axim.openfbo.com/pxaregs-axim
> > >
> > > You can use it to control the LCD backlight:
> > >
> > > Backlight Off:
> > > ./pxaregs-axim PWMDUTY0_DCYCLE 0
> > >
> > > Backlight On full intensity:
> > > ./pxaregs-axim PWMDUTY0_DCYCLE 1023
> >
> > wow nice now someone should write a kernel driver for that.
> >
> > or is there already a std pxa backlight driver?
> >
> >
> > >
> > > Or anything in between. I don't notice much change in intensity
> > > beyond 600 or so.
> > >
> > > The Axim is using a pulse width modulation (PWM) pin to control brightness.
> > >
> > > Cheers,
> > > Matt
> >
> > patrick
> >
> > --
> > Patrick Steiner | patrick.steiner_at_a1.net
> > ICQ: 128261350
> > WWW: http://helmsdeep.homelinux.net/~pat
> >
> > working on (tux4u.skynet):
> > Fedora Core release 6 (Zod)
> > GNU/Linux 2.6.19-1.2911.6.5.fc6
> > --
> > _______________________________________________
> > Aximx50-port mailing list
> > Aximx50-port_at_handhelds.org
> > https://www.handhelds.org/mailman/listinfo/aximx50-port
> >
>
Received on Wed Mar 14 2007 - 15:49:01 EST