Nothing extra in sysfs (yet) but I have left the way open in the driver
to do this.
Provides vid, vrm, fan_input(1-4), fan_min(1-4), pwm(1-3),
pwm_enable(1-3), in_input(0-4), in_min(0-4), in_max(0-4),
temp_input(1-3), temp_min(1-3), temp_max(1-3), alarms.