9df7305b5a
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>
33 lines
1.2 KiB
Text
33 lines
1.2 KiB
Text
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.
|