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Subject: Re: Faking Sensor Readings
To: rgrs <rgrs@protonmail.com>
Cc: "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>,
 Alexander Amelkin <a.amelkin@yadro.com>,
 "Thomaiyar, Richard Marian" <richard.marian.thomaiyar@linux.intel.com>
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From: James Feist <james.feist@linux.intel.com>
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Date: Wed, 4 Dec 2019 09:10:52 -0800
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On 12/4/19 1:39 AM, rgrs wrote:
> 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@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

This looks like phosphor-hwmon, not dbus-sensors 
https://github.com/openbmc/dbus-sensors.


> .Value                           property  x         18500                                    emits-change writable
> 
> root@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@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@obmc:~#
> 
> Thanks,
> Raj
> 
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Wednesday, December 4, 2019 1:34 AM, James Feist <james.feist@linux.intel.com> wrote:
> 
> &gt; On 12/3/19 5:49 AM, Alexander Amelkin wrote:
> &gt;
> &gt; &gt; 03.12.2019 15:06, rgrs wrote:
> &gt; &gt;
> &gt; &gt; &gt; Hi,
> &gt; &gt; &gt; How do I fake sensor readings in OpenBMC?
> &gt; &gt; &gt; We're trying to fake temperature sensors and make sure fans ramp up/down
> &gt; &gt; &gt; accordingly.
> &gt; &gt;
> &gt; &gt; We ended up patching the kernel driver to fake the readings by request.
> &gt; &gt; I'm not aware of any ready interface in OpenBMC for that.
> &gt;
> &gt; If you're using d-bus sensors, the sensor property is writable. It is
> &gt; also supported by patching the sensor value in redfish.
> &gt;
> &gt; &gt; With best regards,
> &gt; &gt; Alexander Amelkin
> 
> </james.feist@linux.intel.com>
>