ACPI CMBAT notify's never reach devd?

[Guido van Rooij]

On Thu, Jan 14, 2010 at 09:42:41AM -0800, Nate Lawson wrote:
> Guido van Rooij wrote:
> > On Wed, Jan 13, 2010 at 05:55:42PM -0800, Nate Lawson wrote:
> >> Most battery systems don't generate the notifies on level changes. So
> >> our ACPI battery implementation itself is polled. You should probably
> >> just run a cron job that checks the level.
> > 
> > That can be done of course, but devd seems a better place.
> 
> Yes, I just meant for now.
> 
> >> Perhaps we could add a low and high mark to the kernel code,
> >> configurable by the user. It would be checked by the cmbat polling code
> >> and generate an artificial notify to devd if there was a match.
> >>
> > 
> > Can you tell me which function in acpi_cmbat is used for polling,
> > as it seems to me thee is no regular polling. There is a define
> > CMBAT_POLLRATE but it is never used.
> 
> It's been a long time since I looked at the code. I think it does it
> synchronously, in the context of a user requesting the value. So we
> don't have a periodic polling thread currently.

Indeed. That's how I read the code. Having a polling mechanism would
involve a new thread (I think) just as with acpi_thermal.

I'll just create a crontab for now ;)

-Guido