start io subsystem

driver/Makefile

@@ -1,31 +1,31 @@
 NAME = counter
+OBJS = init.o leds.o ls7366r.o trigger.o io.o
+KDIR := /lib/modules/$(shell uname -r)/build
+DTC_FLAGS := -@ -I dts -O dtb
+
 obj-m += $(NAME).o
-$(NAME)-objs := init.o leds.o ls7366r.o trigger.o
+$(NAME)-objs := $(OBJS)
 
 all: $(NAME).ko $(NAME).dtbo
 	echo Builded Device Tree Overlay and kernel module
 
-$(NAME).ko: init.c leds.c ls7366r.c trigger.c
-	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+$(NAME).ko:
+	make -C $(KDIR) M=$(PWD) modules
 
 $(NAME).dtbo: $(NAME).dts
-	dtc -@ -I dts -O dtb -o $@ $<
+	dtc $(DTC_FLAGS) -o $@ $<
 
 clean:
-	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
+	make -C $(KDIR) M=$(PWD) clean
 	rm -rf $(NAME).dtbo
 	
 load:
-	sudo dtoverlay -d . $(NAME).dtbo
-	@echo "Overlay loaded"
-	sudo insmod ./$(NAME).ko
-	@echo "LKM loaded"
+	sudo dtoverlay -d . $(NAME).dtbo && echo "Overlay loaded"
+	sudo insmod ./$(NAME).ko && echo "LKM loaded"
 
 unload:
-	sudo rmmod ./$(NAME).ko
-	@echo "LKM unloaded"
-	sudo dtoverlay -R $(NAME)
-	@echo "Overlay unloaded"
+	sudo rmmod ./$(NAME).ko && echo "LKM unloaded"
+	sudo dtoverlay -R $(NAME) && echo "Overlay unloaded"
 
 list: 
 	sudo dtoverlay -l