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| author | Steve Glendinning <steve.glendinning@smsc.com> | 2010-08-14 21:08:54 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@linux-fr.org> | 2010-08-14 21:08:54 +0200 |
| commit | 9df7305b5a8651eb940e98496bc1d4742379c578 (patch) | |
| tree | a57f2f4feca16e98da54c9fc39d6f549ce137d1e /Documentation | |
| parent | 5a9c2cd881f48d4bec627cccde386f8e3a28bb4a (diff) | |
| download | lwn-9df7305b5a8651eb940e98496bc1d4742379c578.tar.gz lwn-9df7305b5a8651eb940e98496bc1d4742379c578.zip | |
hwmon: Add driver for SMSC EMC2103 temperature monitor and fan controller
SMSC's EMC2103 family of temperature/fan controllers have 1
onboard and up to 3 external temperature sensors, and allow
closed-loop control of one fan. This patch adds support for
them.
Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/hwmon/emc2103 | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/Documentation/hwmon/emc2103 b/Documentation/hwmon/emc2103 new file mode 100644 index 000000000000..a12b2c127140 --- /dev/null +++ b/Documentation/hwmon/emc2103 @@ -0,0 +1,33 @@ +Kernel driver emc2103 +====================== + +Supported chips: + * SMSC EMC2103 + Addresses scanned: I2C 0x2e + Prefix: 'emc2103' + Datasheet: Not public + +Authors: + Steve Glendinning <steve.glendinning@smsc.com> + +Description +----------- + +The Standard Microsystems Corporation (SMSC) EMC2103 chips +contain up to 4 temperature sensors and a single fan controller. + +Fan rotation speeds are reported in RPM (rotations per minute). An alarm is +triggered if the rotation speed has dropped below a programmable limit. Fan +readings can be divided by a programmable divider (1, 2, 4 or 8) to give +the readings more range or accuracy. Not all RPM values can accurately be +represented, so some rounding is done. With a divider of 1, the lowest +representable value is 480 RPM. + +This driver supports RPM based control, to use this a fan target +should be written to fan1_target and pwm1_enable should be set to 3. + +The 2103-2 and 2103-4 variants have a third temperature sensor, which can +be connected to two anti-parallel diodes. These values can be read +as temp3 and temp4. If only one diode is attached to this channel, temp4 +will show as "fault". The module parameter "apd=0" can be used to suppress +this 4th channel when anti-parallel diodes are not fitted. |