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Old 07-07-2008, 02:25 AM   #1
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Linux - 2.6 - Device Driver - using multiple C files


I have written a simple char driver(mychar) for linux 2.6.22 kernel.
I have split my driver code into 2 C files.
- mychar.c (main file where __init is present)
- test1.c (some user defined function)

I am using Makefile for compilation.
My makefile looks like this -

obj-m += mychar.o
mychar-objs += TEST/test1.o

KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)

$(MAKE) -C $(KDIR) M=$(PWD) modules

$(MAKE) -C $(KDIR) M=$(PWD) clean

I am interested in building only mychar.ko and no the whole kernel.
I am doing my development on Ubuntu 7.10 with kernel version 2.6.22-14-generic

Although this Makefile works and I could able to generate "mychar.ko". Also when I do "insmod mychar.ko" the module installs successfully, and I could see "mychar" in "lsmod" output.
(But could not find it in - /proc/devices)
I have added some printk in my module_init function but after doing insmod I am not able to see any output in /var/log/messages

If I put everything in single C file(only mychar.c), I could able to see all the output in /var/log/messages.

Please let me know what am I doing wrong while including the 2 C files and how should the makefile be modified.
( I have referred Documentation/kbuild makefiles.txt for creating my makefile)

Thanks, Regards


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