Re: pxaregs and backlight control

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 - 15:15:16 EST