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| author | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-03-02 15:19:35 -0800 |
|---|---|---|
| committer | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-03-14 22:39:12 -0700 |
| commit | 2d2e148a237f790a19e2faa6d8387cf254010358 (patch) | |
| tree | 3733c2dc51d3118f3181ab21acab2fcfcfa69108 /Documentation/hwmon | |
| parent | de7790155f745d30d58ed131ed112b8735413ab7 (diff) | |
| download | lwn-2d2e148a237f790a19e2faa6d8387cf254010358.tar.gz lwn-2d2e148a237f790a19e2faa6d8387cf254010358.zip | |
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>
Diffstat (limited to 'Documentation/hwmon')
| -rw-r--r-- | Documentation/hwmon/sysfs-interface | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface index c6559f153589..83a698773ade 100644 --- a/Documentation/hwmon/sysfs-interface +++ b/Documentation/hwmon/sysfs-interface @@ -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) |