From 99132b4bf5c0a19b38695fd8bcaac8d3829b4bd1 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Tue, 11 Jul 2023 08:07:20 +0200
Subject: build: split makefile

---
 Kbuild   | 10 ++++++++++
 Makefile | 32 ++++++++++++--------------------
 2 files changed, 22 insertions(+), 20 deletions(-)
 create mode 100644 Kbuild

diff --git a/Kbuild b/Kbuild
new file mode 100644
index 0000000..250db3e
--- /dev/null
+++ b/Kbuild
@@ -0,0 +1,10 @@
+obj-m := cyber.o
+cyber-objs :=	src/cyber_device.o \
+							src/cyber_device_character_device.o \
+							src/cyber_device_device_class.o \
+							src/cyber_device_kernel_device.o \
+							src/cyber_file.o \
+							src/cyber_lifecycle.o \
+							src/cyber.o
+
+ccflags-y := -I$(src)/include
diff --git a/Makefile b/Makefile
index 37df362..0c25810 100644
--- a/Makefile
+++ b/Makefile
@@ -1,25 +1,17 @@
-EXTRA_CFLAGS := -I$(src)/include
+ifneq ($(KERNELRELEASE),)
+include Kbuild
+else
+KDIR ?= /lib/modules/`uname -r`/build
 
-obj-m := cyber.o
+modules:
+	@$(MAKE) -C $(KDIR) M=$$PWD modules
 
-cyber-objs :=	src/cyber_device.o \
-							src/cyber_device_character_device.o \
-							src/cyber_device_device_class.o \
-							src/cyber_device_kernel_device.o \
-							src/cyber_file.o \
-							src/cyber_lifecycle.o \
-							src/cyber.o
-
-ifeq ($(KERNEL_VERSION),)
-KERNEL_VERSION=$(shell uname -r)
-endif
-
-all:
-	make -C /lib/modules/$(KERNEL_VERSION)/build/ M=$(PWD) modules
+clean:
+	@$(MAKE) -C $(KDIR) M=$$PWD clean
 
 install:
-	make -C /lib/modules/$(KERNEL_VERSION)/build/ M=$(PWD) modules_install
-	depmod -a
+	@$(MAKE) -C $(KDIR) M=$$PWD modules_install
+	@depmod -a
+
+endif
 
-clean:
-	make -C /lib/modules/$(KERNEL_VERSION)/build/ M=$(PWD) clean
-- 
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