Hi Philip, On Wed, 27 Apr 2005 09:18:09 -0700, Philip Pokorny <ppokorny at penguincomputing.com> wrote: > >This ripple counter sounds like the same thing, but working on the fan >pulses directly rather than on the 22.5kHz clock. So the fan tach >signal is slower with a higher divisor. The main difference is that changing ripple will change fan speed reading, that aspect is different from other chips, thus the variable needs a different name. The fan speed reading in fscher is defined as 0..255 U/sec. What is a 'U'? Code comments suggest revs / sec? >So the fan_ripple is the *inverse* of the fan_div value, but they have >the same net effect, and you can account for the reciprical in the >driver. ie fan_div = 8/fan_ripple (if the max "ripple" value is 8) Yes, you may do that, but without the chip to test I'd rather just put fsc* fan_div/fan_ripple into a different common name so user land sees it has a different meaning. Sysfs names project is cleaning up and documenting sysfs naming. I'm working up to fan speed control :) Cheers, --Grant.
