From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: postmaster@icnet.pl
Cc: linux-input@vger.kernel.org
Subject: Re: How to choeck for a gpio-keys based switch state?
Date: Fri, 15 May 2009 11:58:06 -0700 [thread overview]
Message-ID: <20090515185806.GA22662@dtor-d630.eng.vmware.com> (raw)
In-Reply-To: <4A0D8EAB.6070900@tis.icnet.pl>
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
next prev parent reply other threads:[~2009-05-15 18:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-15 15:47 How to choeck for a gpio-keys based switch state? Janusz Krzysztofik
2009-05-15 18:58 ` Dmitry Torokhov [this message]
2009-05-16 8:30 ` Janusz Krzysztofik
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