Rotary encoder platform device driver code examples

Hi guys,

I want to interface a magnetic scale position sensor with a BeagleBone Black (an ARM development platform).
While I was reading this following article : http://bwgz57.wordpress.com/2012/04/11/beaglebone-with-a-rotary-encoder/ I discovered that linux has built-in support for rotary encoders connected via GPIO.

The magnetic scale position sensor can be considered like a rotary encoder so I would use the rotary_encoder platform device driver.

I've read the code example at the end of this document : https://www.kernel.org/doc/Documentation/input/rotary-encoder.txt
But I don't know how to access to the "pos" value of the rotary encoder.

Do you have some code example of use of this driver ? Or anything that can be helpful for me.

Thanks,
Regards,

Loïc
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2013/8/21 GRENON Loïc <[email protected]>:

As the rotary encoder is an input device it is accessible via /dev/input/eventX where X is
a number. Have a look at evtest user space application.

greets
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Christian Gmeiner, MSc
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