Common interface for sensors/health monitoring

[Marc Balmer]

Am 22.08.2009 um 18:29 schrieb Alexander Leidinger:

> On Sat, 22 Aug 2009 08:50:23 +0200 Marc Balmer <marc at msys.ch> wrote:
>
>> The OpenBSD sensors framework lacks some desireable features, e.g.
>> event capabilities like getting an event if a certain threshold is
>> exceeded.  And it propbably was used for things that it better had
>
> This assumes the kernel is monitoring the device periodically (in the
> general case, as there are a lot of dump sensors which do not send
> events on their own). The framework as in the SoC did not provide this
> feature to keep the kernel part simple. You want to see a value, you
> poll the kernel for it, and the userland would have been responsible  
> to
> fire up an event.
>
> For smart sensors which trigger an event on their own (interrupt), you
> can use the exiting kernel event framework (and the idea in the SoC
> was to use it for such sensors). The devd is the userland side of it.
>
>> not (yes, I am culprit for on of these (ab)uses...).
>>
>> I am sure these features could be added if only the code was in the
>> tree to hack on...
>
> The event stuff is in the kernel, go ahead and write a driver for your
> smart sensor which fires events on its own.

Well, most of the sensors are likely I2C or 1-Wire devices and these  
can only be polled.