Add uninstallation support

Author: spbnick

Makefile

@@ -3,15 +3,23 @@ obj-m := hid-huion.o
 else
 KDIR := /lib/modules/$(shell uname -r)/build
 PWD := $(shell pwd)
+UDEV_RULES := /lib/udev/rules.d/70-hid-rebind.rules
+DEPMOD_CONF := /etc/depmod.d/digimend.conf
+HID_REBIND := /sbin/hid-rebind
 modules modules_install clean:
 	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) $@
 conf_install:
-	install -D -m 0644 digimend.conf /etc/depmod.d/digimend.conf
+	install -D -m 0644 digimend.conf $(DEPMOD_CONF)
 modules_depmod: modules_install conf_install
 	depmod -a
 udev_install:
-	install hid-rebind /sbin
-	install -m 0644 hid-rebind.rules /lib/udev/rules.d/70-hid-rebind.rules
+	install hid-rebind $(HID_REBIND)
+	install -m 0644 hid-rebind.rules $(UDEV_RULES)
 	udevadm control --reload
 install: modules_depmod udev_install
+uninstall:
+	rm -vf $(UDEV_RULES) $(HID_REBIND) $(DEPMOD_CONF) \
+		/lib/modules/*/extra/hid-huion.ko
+	udevadm control --reload
+	depmod -a
 endif

README.md

@@ -66,3 +66,9 @@ to execute `rmmod hid-huion`, and then disconnect and reconnect the tablet to
 make it work.
 
 Alternatively, you can simply reboot the machine.
+
+Uninstalling
+------------
+
+To uninstall the package execute `make uninstall` in the package source
+directory.