Hey folks - I have a need to have an ambient light sensor in my silly little clock project. I have a driver for the particular sensor I’m using that runs entirely in user space, but I’m wondering if it might be a good idea to glue it into envsys.
There are a couple reasons for putting it into envsys that I can see: 1- Hey, why not. It’s an environmental sensor, after all. We already handle relative humidity, why not sunshine too? 2- Putting a driver for it in the kernel would allow me to eventually support interrupting on high-light / low-light thresholds, so that I don’t have to poll all the time. Granted, with the GPIO interrupt support I just added, I could do this entirely in user space with the kqueue-based “GPIO event” stuff originally written by Brad Spencer that I plan to integrate. But in general, I think that envsys should get proper support for interrupting on interesting events. I think all that’s really needed is a new sensor unit type of “Lux”. It’s been a while since I looked at envsys, do I don’t know if it’s possible to set high/low thresholds yet… eventually, I think that needs be done in a generic way, but I’m going to start with polling for now. Ok… DISCUSS! -- thorpej
