Kernel driver ionic-hwmon

Supported chips:

• AMD Pensando Ethernet adapters whose firmware advertises IONIC_DEV_CAP_HWMON

  Prefix: ‘ionic’

Author:

Arun Kumar Prakash <ArunKumar.Prakash@amd.com>

Description

AMD Pensando Ethernet adapters carry on-board sensors that the adapter firmware can report. The ionic Ethernet driver creates an ionic.hwmon auxiliary device for adapters whose firmware advertises sensors, and the ionic-hwmon driver binds to it and exposes the readings to the Linux hwmon subsystem, so userspace utilities such as sensors can read them. The hwmon device is a child of the adapter’s PCI function.

The adapter reports which sensors it has when the hwmon device is created, so the files that appear depend on the adapter and its firmware version. The hwmon device is removed and re-created across a firmware recovery, and the sensors are read again when it is re-created.

The labels are reported once, with the capabilities, and do not change while the device is bound.

sysfs interface

Attribute files exist only for the channels and attributes the firmware reports, within /sys/class/hwmon/hwmon[X]:

Name	Perm	Description
temp[X]_input	RO	Temperature in millidegrees Celsius (m°C). May read below zero.
temp[X]_label	RO	Temperature sensor label.
temp[X]_crit	RO	Critical temperature threshold, in millidegrees Celsius.
temp[X]_crit_alarm	RO	Critical temperature alarm indicator.
in[X]_input	RO	Voltage in millivolts (mV).
in[X]_label	RO	Voltage sensor label.
power[X]_input	RO	Power in microwatts (uW).
power[X]_label	RO	Power sensor label.
power[X]_max	RO	Maximum power threshold, in microwatts.

Labels are strings supplied by the firmware. A channel that reports an empty label has no _label attribute.