Re: How to choeck for a gpio-keys based switch state?

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Hi Janusz,

On Fri, May 15, 2009 at 05:47:55PM +0200, Janusz Krzysztofik wrote:
> Hi,
>
> Greetings from new list member.
>
> I am trying to create a gpio-keys based platform device driver for a  
> hook switch. I am wondering if there is a possibility to check for the  
> switch state before the first event comes up. I think this feature could  
> be essential for correct user experience - an application should know  
> the switch state from the start.
> As I am not able to find such functionality in the current gpio-keys  
> driver, I wonder if this could be done over gpiolib sysfs interface by  
> adding optional gpio_export() call to the driver init function. I can  
> try to provide a patch if this sounds reasonable to you.
>

Your application should use EVIOCGSW ioctl to query the initial state of
the switches.

-- 
Dmitry
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