Re: writing device drivers howto

On 8/22/06, andreas.sumper-pukXrzrhGDxjulsHllwzJA@xxxxxxxxxxxxxxxx 
<andreas.sumper-pukXrzrhGDxjulsHllwzJA@xxxxxxxxxxxxxxxx> wrote:
> This is some sort of offtopic, but I guess this is the best point to ask.
> I have an embedded system running linux. I need to access some special
> registers (e.g. containing the clock cycles, ...) So I managed to write a
> very simple module, which is able to access the registers. But what makes me
> worrying now, is the way, I have to get the data into my user-space
> application. Is there some documentation, concerning writing device drivers
> and accessing them from the user space anywhere? I found some documentation,
> but either I did not understand the part about getting data from kernel
> space into user space, or it was just simply missing.

Check the Linux Journal on Miscellaneous Character Devices.  There's
an article there you can use to base your work on.

--
Kelly "STrRedWolf" Price
http://strredwolf.furrynet.com