linux-kernel - Re: rotary encoder linux driver

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Message-ID: <20141014084815.GC7958@localhost>
Date:	Tue, 14 Oct 2014 10:48:15 +0200
From:	Johan Hovold <johan@...nel.org>
To:	tecfacet <tecfacet@...oo.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: rotary encoder linux driver

On Sun, Oct 12, 2014 at 06:29:03PM -0700, tecfacet wrote:
> Hello.
> 
> I am interested in the rotary encoder kernel driver.  I am very new to
> this linux kernel driver thing.  
> 
> How do I pass the gpio and interrupt stuff to the kernel module.. I
> think it is thru the rotary_encoder.h file.. am I correct?

That should be done through the device tree these days. The binding is
documented in

	Documentation/devicetree/bindings/input/rotary-encoder.txt

in the kernel source tree.

> How does the information about encoder position etc get back to my
> user space program?  How is debounce handled?
> I am a little confused.  Is there an example of a complete working
> implementation?  I need to figure this out for school.

Have a look at the evtest program for an example:

	http://cgit.freedesktop.org/~whot/evtest

Good luck,
Johan
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