add helper files

.gitignore

@@ -0,0 +1,9 @@
+*.cmd
+*.symvers
+*.ko
+*.mod
+*.mod.c
+*.o
+*.gz
+*.order
+*.txt

Makefile

@@ -0,0 +1,11 @@
+ifneq ($(KERNELRELEASE),)
+# kbuild part of makefile
+obj-m  := adxl345.o
+
+else
+# normal makefile
+KDIR ?= /lib/modules/`uname -r`/build
+
+default:
+	$(MAKE) -C $(KDIR) M=$$PWD
+endif