From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- Documentation/hwmon/emc2103.rst | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 Documentation/hwmon/emc2103.rst (limited to 'Documentation/hwmon/emc2103.rst') 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 + +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. -- cgit v1.2.3