[Voyage-linux] About GPIO support

[Stéphane Acounis]

Le Thu, 10 Feb 2011 10:37:26 +0100
Stéphane Acounis <stephane.acounis at subatech.in2p3.fr> a écrit:

> Le Thu, 10 Feb 2011 09:36:20 +0800
> "Kim-man 'Punky' TSE" <punkytse at punknix.com> a écrit:
> 
> > Why not using the stock one but instead of this patch?
> 
> Hi Kim,
> 
> And so, practically, how do you access the switch (GPIO24) with the
> stock kernel?
> I'd like to be able to sense the switch in order to make a poweroff
> button.
> 
> Thanks.
> 

OK, I know, I should have searched a little bit by myself before asking
the list.

The state of the button can be monitored with this line:
od -x  /dev/cs5535_gpio24 | cut -c 11-12 | head -1

it reads 31 in the idle state and 30 if the button is pressed.

-- 
Stéphane ACOUNIS
SUBATECH Nantes - Service d'Électronique
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