Faking Sensor Readings

[rgrs]

Hi James,

I tried busctl set-property,  but the values didn't change.
Are the steps below correct?
(test with both 'field mode' enabled and disabled)

root at obmc:~# busctl introspect xyz.openbmc_project.Hwmon-2439434288.Hwmon1  /xyz/openbmc_project/sensors/temperature/INLET_TEMP xyz.openbmc_project.Sensor.Value --no-pager
NAME                             TYPE      SIGNATURE RESULT/VALUE                             FLAGS
.MaxValue                        property  x         0                                        emits-change writable
.MinValue                        property  x         0                                        emits-change writable
.Scale                           property  x         -3                                       emits-change writable
.Unit                            property  s         "xyz.openbmc_project.Sensor.Value.Unit.… emits-change writable
.Value                           property  x         18500                                    emits-change writable

root at obmc:~# busctl --no-pager set-property xyz.openbmc_project.Hwmon-2439434288.Hwmon1  /xyz/openbmc_project/sensors/temperature/INLET_TEMP xyz.openbmc_project.Sensor.Value  Value x 50000

root at saber:~# busctl --no-pager get-property xyz.openbmc_project.Hwmon-2439434288.Hwmon1  /xyz/openbmc_project/sensors/temperature/INLET_TEMP xyz.openbmc_project.Sensor.Value  Value
x 18500

root at obmc:~#

Thanks,
Raj

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Wednesday, December 4, 2019 1:34 AM, James Feist <james.feist at linux.intel.com> wrote:

> On 12/3/19 5:49 AM, Alexander Amelkin wrote:
>
> > 03.12.2019 15:06, rgrs wrote:
> >
> > > Hi,
> > > How do I fake sensor readings in OpenBMC?
> > > We're trying to fake temperature sensors and make sure fans ramp up/down
> > > accordingly.
> >
> > We ended up patching the kernel driver to fake the readings by request.
> > I'm not aware of any ready interface in OpenBMC for that.
>
> If you're using d-bus sensors, the sensor property is writable. It is
> also supported by patching the sensor value in redfish.
>
> > With best regards,
> > Alexander Amelkin

</james.feist at linux.intel.com>