Re: Writing I2C Sensor Kernel Modules

[Sylwester Nawrocki <s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>]

Hi,

On 06/27/2013 04:33 PM, Robin Müller-Bady wrote:
> I have a (architectural design) question about I2C drivers in kernel space.
> Currently, I'm writing userspace software for using external sensors
> on an raspberry pi via bcm2835's I2C bus with the help of
> wiringPi/ioctl, e.g. the barometric pressure with the MPL115A2 sensor.

AFAIK the IIO framework should be use nowadays sensors like this one.
Unfortunately I'm not aware of any detailed documentation of this
subsystem. This presentation [1] might be helpful.

I think you could get some help asking on linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
mailing list.

> I now had the idea to write the software directly in kernel space,
> providing a device, e.g. /dev/mpl115a2, for polling the sensor data.
> Does this idea fit into the architectural design of the I2C subsystem
> / the sensors ? Or should code for handling I2C clients stay in
> userspace?
> Is there any good documentation for writing such drivers except the
> kernel Documentation? I found some information in the kernel wiki
> which is unfortunately not that detailed.

[1] http://tinyurl.com/o6yxwrm

Regards,
Sylwester