Re: best way to handle LEDs

Geert Uytterhoeven
2005-11-03T08:38:33Z

On Wed, 2 Nov 2005, Pavel Machek wrote:
> > > yellow off: not charging
> > > yellow on: charging
> > > yellow fast blink: charge error
> > >
> > > I think even slow blinking was used somewhere. I have some code from
> > > John Lenz (attached); it uses sysfs interface, exports led collor, and
> > > allows setting different frequencies.
> > >
> > > Is that acceptable, or should some other interface be used?
> >
> > IMHO reducing digital outputs to LEDs goes not far enough. All System-
> > on-Chip CPUs have General Purpose I/O pins today, which can act as
> > inputs or outputs and may be used for LEDs, matrix keyboard lines,
>
> We have some leds that are *not* on GPIO pins (like driven by
> ACPI). We'd like to support those, too.

I though ACPI was software? These LEDs have to be driven by some hardware,
right?

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds