diff options
author | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-03-02 18:19:35 -0500 |
---|---|---|
committer | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-03-15 01:39:12 -0400 |
commit | 2d2e148a237f790a19e2faa6d8387cf254010358 (patch) | |
tree | 3733c2dc51d3118f3181ab21acab2fcfcfa69108 /Documentation/hwmon | |
parent | de7790155f745d30d58ed131ed112b8735413ab7 (diff) |
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 c6559f15358..83a698773ad 100644 --- a/Documentation/hwmon/sysfs-interface +++ b/Documentation/hwmon/sysfs-interface | |||
@@ -187,6 +187,17 @@ fan[1-*]_div Fan divisor. | |||
187 | Note that this is actually an internal clock divisor, which | 187 | Note that this is actually an internal clock divisor, which |
188 | affects the measurable speed range, not the read value. | 188 | affects the measurable speed range, not the read value. |
189 | 189 | ||
190 | fan[1-*]_pulses Number of tachometer pulses per fan revolution. | ||
191 | Integer value, typically between 1 and 4. | ||
192 | RW | ||
193 | This value is a characteristic of the fan connected to the | ||
194 | device's input, so it has to be set in accordance with the fan | ||
195 | model. | ||
196 | Should only be created if the chip has a register to configure | ||
197 | the number of pulses. In the absence of such a register (and | ||
198 | thus attribute) the value assumed by all devices is 2 pulses | ||
199 | per fan revolution. | ||
200 | |||
190 | fan[1-*]_target | 201 | fan[1-*]_target |
191 | Desired fan speed | 202 | Desired fan speed |
192 | Unit: revolution/min (RPM) | 203 | Unit: revolution/min (RPM) |