RFC PATCH 2.6 sysfs names: fscher: change div to ripple
grant_lkml at dodo.com.au
Wed Apr 27 23:04:20 CEST 2005
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 :)
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