LM78 driver

[Paul Goyette <paul%whooppee.com@localhost>]

I've just completed porting OpenBSD's LM78 (and family) driver for 
system environmental monitors, only to discover that there's already a 
driver in NetBSD (in src/sys/dev/ic/ directory).  However, there's a 
couple of issues:

1. The existing driver only has an ISA attachment, in src/sys/dev/isa/

and

2. Even though src/sys/dev/files/isa provides an attachment for the lm
   driver to the isa bus, there's no "device lm" anywhere, nor is there
   any reference to the driver's source file in any .../files*

So, I have to wonder if this driver has ever been built and tested?  Or 
even compiled, since config(1) barfs if you try to include it.

I further wonder what is the correct way to proceed to incorporate some 
support for this family of chips in NetBSD.  Should I continue with 
finding someone to test my port of OpenBSD's driver?  Or is there some 
previous history of testing the existing driver that can be built upon 
after adding an i2c attachment?

Side question:  regardless of which approach is to be taken, I'd like to 
know where the correct place would be to add the main "device lm" stuff? 
There doesn't seem to be a files.* file in src/sys/dev/ic, and the 
driver is common to i2c and isa busses so it really doesn't belong in 
either src/sys/dev/i2c/files.i2c or src/sys/dev/isa/files.isa.  I also 
suspect that this sensor could be used in multiple architectures, so it 
probably doesn't belong in any src/sys/arch/*/files.* either.


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