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hwmon: Add tachometer pulses per fan revolution to sysfs ABI 

Some fan control chips support a configuration register to set the number of
tachometer pulses per fan revolution. Add an ABI attribute to support this
configuration register.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Guenter Roeck 2011-03-02 15:19:35 -08:00
parent de7790155f
commit 2d2e148a23
1 changed files with 11 additions and 0 deletions
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Documentation/hwmon/sysfs-interface
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@ -187,6 +187,17 @@ fan[1-*]_div Fan divisor.
Note that this is actually an internal clock divisor, which
affects the measurable speed range, not the read value.
fan[1-*]_pulses Number of tachometer pulses per fan revolution.
Integer value, typically between 1 and 4.
RW
This value is a characteristic of the fan connected to the
device's input, so it has to be set in accordance with the fan
model.
Should only be created if the chip has a register to configure
the number of pulses. In the absence of such a register (and
thus attribute) the value assumed by all devices is 2 pulses
per fan revolution.
fan[1-*]_target
Desired fan speed
Unit: revolution/min (RPM)