Using RTC for wake up

[Holger Freyther]

On Wednesday 30 July 2008 15:44:06 Sven Klomp wrote:
> On Wednesday 30 July 2008 13:57:29 Holger Freyther wrote:
> > On Wednesday 30 July 2008 11:22:44 Sven Klomp wrote:
> > > some time ago I heard that the realtime clock can be used to wake up
> > > the CPU from supend:
> > > http://lists.openmoko.org/pipermail/community/2008-February/013366.html
> > >
> > > However, I couldn't find an further information. How can I set PMU to
> > > wake up the CPU based on the clock? Is there any sysfs file?
> >
> > with ASU atd is running and you can schedule execution of programs by
> > placing files in a certain directory (take a look at the code), otherwise
> > use the plain linux rtc ioctl interface directly.
>
> And atd can also wake up from suspend? I couldn't find where the RTC is
> set...

Yes, it will wakeup. This is how the alarm handling of the Qtopia clock is 
done. The code of atd can be found here [1]. I'm not sure if it is the latest 
available version...

z.


[1] http://handhelds.org/cgi-bin/cvsweb.cgi/apps/atd/