Driver Hello World example in Ubuntu

[johanngomes]

Hi, i have in the same folder the following archives:

hello.c


#include <linux/init.h>#include <linux/module.h>


MODULE_LICENSE("Dual BSD/GPL");


static int hello_init(void)
{
printk(KERN_ALERT "Hello, world\n");
return 0;
}


static void hello_exit(void)
{
printk(KERN_ALERT "Goodbye, cruel world\n");
}


module_init(hello_init);
module_exit(hello_exit);

Makefile



obj-m += hello.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean


When i run the command
make in the folder where there is this archives, i get:


make -C /lib/modules/3.5.0-34-generic/build M=/home/johann/Desktop/8º Período/Infra-Estrutura de Software/driver-linux modulesmake[1]: Entering directory `/usr/src/linux-headers-3.5.0-34-generic'
make[1]: *** No rule to make target `Período/Infra-Estrutura'. Stop.
make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-34-generic'
make: *** [all] Error 2




What am i missing? Thanks in advance :p

[Bucky Ball]

Thread moved to Programming Talk.

[xb12x]

Hi, i have in the same folder the following archives:

hello.c



#include <linux/init.h>
#include <linux/module.h>


MODULE_LICENSE("Dual BSD/GPL");


static int hello_init(void)
{
printk(KERN_ALERT "Hello, world\n");
return 0;
}


static void hello_exit(void)
{
printk(KERN_ALERT "Goodbye, cruel world\n");
}


module_init(hello_init);
module_exit(hello_exit);

Makefile



obj-m += hello.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean


When i run the command
make in the folder where there is this archives, i get:



make -C /lib/modules/3.5.0-34-generic/build M=/home/johann/Desktop/8º Período/Infra-Estrutura de Software/driver-linux modules
make[1]: Entering directory `/usr/src/linux-headers-3.5.0-34-generic'
make[1]: *** No rule to make target `Período/Infra-Estrutura'. Stop.
make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-34-generic'
make: *** [all] Error 2


What am i missing? Thanks in advance :p


The folder's path contains spaces. Create a folder with no spaces in the path:
/home/johann/drivers/hello

[dwhitney67]

What am i missing? Thanks in advance :p

It's not what your missing, but what you have. You have white-space in your directory names, and that is confusing the 'make' command. Simply surrounding the $(PWD) with double-quotes will not solve the problem. Thus unless someone else chimes in with a brilliant suggestion, my suggestion right now is for you to rename your directories to eliminate the white-space.

For example:


/home/johann/Desktop/8ºPeríodo/Infra-EstruturaDeSoftware/driver-linux

[zobayer1]

Hi, i have in the same folder the following archives:

hello.c


#include <linux/init.h>#include <linux/module.h>


MODULE_LICENSE("Dual BSD/GPL");


static int hello_init(void)
{
printk(KERN_ALERT "Hello, world\n");
return 0;
}


static void hello_exit(void)
{
printk(KERN_ALERT "Goodbye, cruel world\n");
}


module_init(hello_init);
module_exit(hello_exit);

Makefile



obj-m += hello.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean


When i run the command
make in the folder where there is this archives, i get:


make -C /lib/modules/3.5.0-34-generic/build M=/home/johann/Desktop/8º Período/Infra-Estrutura de Software/driver-linux modulesmake[1]: Entering directory `/usr/src/linux-headers-3.5.0-34-generic'
make[1]: *** No rule to make target `Período/Infra-Estrutura'. Stop.
make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-34-generic'
make: *** [all] Error 2




What am i missing? Thanks in advance :p

I have written a similar thing few years back, and faced same sort of problems, I fixed it by not using any space in the directory names and instead of $(PWD) I had to use $(shell pwd), I still have no idea why $(PWD) did not work...

Here is the example http://zobayer.blogspot.com/2011/07/simple-character-device.html (http://zobayer.blogspot.com/2011/07/simple-character-device.html)