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| -rw-r--r-- | Documentation/hwmon/emc2103.rst | 37 |
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diff --git a/Documentation/hwmon/emc2103.rst b/Documentation/hwmon/emc2103.rst new file mode 100644 index 000000000..6a6ca6d1b --- /dev/null +++ b/Documentation/hwmon/emc2103.rst @@ -0,0 +1,37 @@ +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. |