Triggerhappy added support for pure REL/ABS devices.

Please add a patch for TriggerHappy.

Tried pull-request but don't know how to use github.

Developer: https://github.com/trurle

https://github.com/wertarbyte/triggerhappy/pull/31
Wertarbyte does not answer. Last commit by wertarbyte committed on 6 Sep 2016

/packages/utils/triggerhappy/patches/001-add_REL-ABS-devices.patch

Date: 28 Feb 2021 18:29:50 +0100
Subject: [PATCH] added support for pure REL/ABS devices (such as rotary encoders)

Some input devices such as rotary encoders don't have keys or switches, 
but can generate EV_REL/EV_ABS events.
This simple change allows these devices to be used with triggerhappy.

Developer: https://github.com/trurle

Signed-off-by: Semen Kreyda <aswerklon@gmail.com>
---
 devices.c | 1 +
 1 file changed, 1 insertions(+)

--- a/devices.c
+++ b/devices.c
@@ -45,6 +45,7 @@
 	int rc = ioctl(fd, EVIOCGBIT(0,sizeof(bits)), bits);
 	return rc > 0 && (
 		/* we only consider devices with keys or switches suitable */
+		test_bit(EV_REL, bits) || test_bit(EV_ABS, bits) ||
 		test_bit(EV_KEY, bits) || test_bit(EV_SW, bits)
 	);
 }

Start with packages/utils/triggerhappy/patches/001-add_REL-ABS-devices.patch and compare it with the upstream devices.c context, then inspect how patches are applied when building the OpenWrt package. Done means the package builds with the patch applied and TriggerHappy recognizes pure REL/ABS devices such as rotary encoders.