PLDM: (MEX LED) Process the Host PDRs for the state sensors & effecters with state set ID IdentifyState

[tomjoseph83]

If there are state sensors with state set ID IdentifyState.

1.Lookup the FRU object associated with the sensor
2.Create the LED D-Bus object /xyz/openbmc_project/led/groups/ object
3.PLDM daemon implements the xyz.openbmc_project.Association.Definitions to create association between FRU and LED D-Bus objects
4.Initialize the Identify D-Bus property by issuing GetSensorReading
5.Add this sensor to the PlatformEventMessage map to update D-bus property value when the PHYP detects a change

If there is a state effecter with the identify state to the corresponding FRU bind the SetProperty of the LED to a StateSetEffecter on the corresponding effecter.

[lxwinspur]

@tomjoseph83 @sampmisr

Could you kindly explain this issue?
I have a couple of questions:

1. PLDM daemon needs to create /xyz/openbmc_project/led/groups/<name>? If so, What is the difference between this and the phosphor-led-manager service ?

2. If there is a state effecter with the identify state to the corresponding FRU bind the SetProperty of the LED to a StateSetEffecter on the corresponding effecter.

sorry, I do not understand?

Thanks a lot

[manojkiraneda]

@tomjoseph83 @sampmisr

Could you kindly explain this issue?
I have a couple of questions:

1. PLDM daemon needs to create ` /xyz/openbmc_project/led/groups/<name>`? If so, What is the difference between this and the `phosphor-led-manager` service ?

Any dbus object can be hosted by any services, its not always the case that led objects should be created by led-manager. In this case the led- objects are created by pldm, based on whether the set set ID identify state is implemented on those state sensors.

2. > If there is a state effecter with the identify state to the corresponding FRU bind the SetProperty of the LED to a StateSetEffecter on the corresponding effecter.

sorry, I do not understand?

once , pldm hosts the led group object, we will have to implement the set and get operations of the Asserted Property.

xyz.openbmc_project.Led.Group       interface -         -            -
.Asserted                           property  b         false        emits-change writable

When some one sets the Asserted dbus property, I think we need to map the effecter that implements the identity led state set ,& call SetEffecterStates command with the right effecter, so that the LED on the MEX will be on.

[lxwinspur]

Review by:
https://gerrit.openbmc-project.xyz/c/openbmc/pldm/+/47137
https://gerrit.openbmc-project.xyz/c/openbmc/pldm/+/47136
https://gerrit.openbmc-project.xyz/c/openbmc/pldm/+/47138