Kernel driver sl28cpld

Supported chips:

  • Kontron sl28cpld

    Prefix: ‘sl28cpld’

    Datasheet: not available

Authors: Michael Walle <>


The sl28cpld is a board management controller which also exposes a hardware monitoring controller. At the moment this controller supports a single fan supervisor. In the future there might be other flavours and additional hardware monitoring might be supported.

The fan supervisor has a 7 bit counter register and a counter period of 1 second. If the 7 bit counter overflows, the supervisor will automatically switch to x8 mode to support a wider input range at the loss of granularity.

Sysfs entries

The following attributes are supported.


Fan RPM. Assuming 2 pulses per revolution.