Bug 83404 - Rotary encoder does not get used by evdev input
Summary: Rotary encoder does not get used by evdev input
Status: RESOLVED MOVED
Alias: None
Product: xorg
Classification: Unclassified
Component: Input/evdev (show other bugs)
Version: unspecified
Hardware: Other All
: medium minor
Assignee: Peter Hutterer
QA Contact: Xorg Project Team
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-09-02 15:51 UTC by Sean Cross
Modified: 2018-08-10 20:54 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:


Attachments

Description Sean Cross 2014-09-02 15:51:47 UTC
We did a board based on the Novena core.  It had a rotary coder connected via GPIO pins.  The device tree file had the following definition:

	rotary@0 {
		compatible = "rotary-encoder";
		gpios = <&gpio2 21 GPIO_ACTIVE_HIGH>, <&gpio1 02 GPIO_ACTIVE_HIGH>;
		linux,axis = <REL_WHEEL>;
		rotary-encoder,relative-axis;
		rotary-encoder,half-period;
	};

Upon initialization, the kernel would create an evdev device present under /dev/input/.  This device has only a mouse wheel, and no other axes.  In order to get the device to actually send events to applications, the following xorg.conf.d file was created:

60-rotary.conf:

Section "InputClass"
    Identifier "Rotary encoder"
    MatchProduct "rotary.20"
    MatchDevicePath "/dev/input/event*"
    Driver "evdev"
EndSection
Comment 1 Peter Hutterer 2014-09-02 21:49:34 UTC
So it works once you apply that config? In that case we need to fix the udev builtin to label devices for us. Or just bite the bullet and enable evdev for all event* devices, but that's not a good idea.
Comment 2 GitLab Migration User 2018-08-10 20:54:10 UTC
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