Re: i2c

[Matt Thomas <matt%3am-software.com@localhost>]

Jachym Holecek wrote:
> Hello,
>
> # Christopher Beck 2006-06-05:
> > I've seen NetBSD supports i2c, but i don't know how to use it. Is there 
> > a special Device and/or a lib with that I can acces it? I want to 
> > connect my Atmels and other NetBSD PCs together (just to give commands 
> > to other units). Has anyone an idea or a link to a HowTo for me?
>
> Well, ${sys}/dev/i2c/i2c_io.h sketches an ioctl() interface to I2C bus,
> but it's not actually exported to userland anywhere (ie. I2C controllers
> are not attached to device files), AFAICS. This means that currently,
> the I2C API is kernel-only.
>
> Exposing it to userland shouldn't be hard, please file a PR so that it
> doesn't get forgotten (unless you want to implement it yourself ;-).

Exporting i2c generically to userland is a bad idea. A suitable abstraction
for the device(s) would be designed and implemented instead.
--
Matt Thomas                     email: matt%3am-software.com@localhost
3am Software Foundry              www: http://3am-software.com/bio/matt/
Cupertino, CA              disclaimer: I avow all knowledge of this message.