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hwmon: Add tachometer pulses per fan revolution to sysfs ABI

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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 Note that this is actually an internal clock divisor, which
affects the measurable speed range, not the read value. 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 fan[1-*]_target
Desired fan speed Desired fan speed
Unit: revolution/min (RPM) Unit: revolution/min (RPM)