On Mon, Oct 15, 2012 at 04:23:59PM +0530, Niroj Pokhrel wrote:

Thank Matthias!!!
I have tried using printk . What I really want to do now is to implement
the methods I have written by calling from the user space. Like I want to
read or write to the character devices via  user space.

Did you register your callbacks for read and write in your char driver ? 
If yes, then you can write and read(given you have methods for write and read
for your char driver), through 'echo', 'cat' etc of your char device through
fs nodes(under /dev). I'm guessing that you've exported your device under /dev
file system.


-Amit

On Mon, Oct 15, 2012 at 3:49 PM, Matthias Brugger <
matthias.bgg at googlemail.com> wrote:

quoted

Hi,


On 10/15/2012 11:24 AM, Niroj Pokhrel wrote:

quoted

Hi,
I'm new to linux and kernel . I'm ongoing with the linux device drivers.
I've followed the the book LDD but i'm lost about how to call my
driver's specific method from the user space.
Eg: if have developed a character device and inserted the module then
how can i make sure that when I read or write that it implement the
functions via the methods i have implemented in my module.

the most easy way would be to put some printk output in your read/write
functions of your driver. So with cat/echo from userspace you should be
able to verify your implementation.

Regards,
Matthias