Constify struct cfattach.

ok miod@

Various fixes to make kiic(4) work on my G5s.

Only read the bus number from the "i2c-bus" child node if present,
this node exists only in some device-trees, otherwise use the bus
number encoded in t

Various fixes to make kiic(4) work on my G5s.

Only read the bus number from the "i2c-bus" child node if present,
this node exists only in some device-trees, otherwise use the bus
number encoded in the address of the device.

Fix an off-by-one when reading the data.

While here remove unused functions.

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if an iic operation fails to move all the data, return error
ok kettenis

lockmgr -> rwlock for piic(4), kiic(4) and smu(4);
smu(4) tested by kettenis@, ok krw@

rename drivers with numbers in them; ok gwk drahn