Proposed changes to the dbcool(4) driver

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

I posted this to tech-kern@ last week, with no comments.  Based on the 
lack of responses, I've gone ahead and made the proposed changes.  I'll 
commit these in a few days unless there's some significant objection.

...

When the dbcool(4) driver was commited, sysmon_envsys(9) did not have 
the ability to retrieve and set sensor limit values in the hardware 
device.  As a result, dbcool had a separate user interface, using 
sysctl(8), for this purpose.

Now that sysmon_envsys has grown the required capability (and it is 
actually working!), I'd like to remove the bulk of the sysctl interface 
from the dbcool driver, and provide that functionality using sysmon's 
capabilities.  (I'll leave intact the ability to control the fan-speed 
PWM controllers, since there's still no viable alternative.)

Does anyone see any reason to leave the sysctl interface in place?  If 
we do leave it, can/should it be enabled/disabled using

        #define DBCOOL_SYSCTL
        ...
        #endif

My preference would be to remove the sensor limit sysctl completely.


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