Product:
https://www.trust.com/en/product/21259-flex-design-tablet-black
http://trust.com/21259
Support in libinput is already in place since libinput 1.11 release (I tested it)
https://gitlab.freedesktop.org/libinput/libinput/issues/38
So only missing part is definition in hwdb.
EVDEV_ABS_35=1238:5785:53
EVDEV_ABS_36=1045:4826:76
+#########################################
+# UGTablet
+#########################################
+
+# Trust Flex Graphics Tablet
+evdev:input:b0003v2179p0004*
+ EVDEV_ABS_00=::234
+ EVDEV_ABS_01=::328
+
#########################################
# Waltop
#########################################