[gmate.amit@gmail.com (Kumar amit mehta)]

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