tree 58aaf577afde45d43dbc9de8edac9ea230bbd782
parent 90ac5828fcf9278b9bc0c5eb6bddc659118d330e
author David Tang <davtang@google.com> 1752508020 -0700
committer Copybara-Service <copybara-worker@google.com> 1752508075 -0700

Add sensor offset and scale parsing and fix sensor reading formula

Dbus sensors allows for customizable offset and scale which needs to be supported in tlBMC (https://github.com/openbmc/dbus-sensors/blob/af1724b84b7558037c665d2106ec44d7362aca6b/src/psu/PSUSensorMain.cpp#L695). To support this, the formula for calculating sensor reading for PSUSensors is also corrected to support a custom Scale defined in EM config.

This CL accomplishes the following:

1. Add logic to parse Scale and Offset from EM config for PSUSensors
2. Add Scale and Offset (as proto ReadingTransformConfg) to SensorStaticAttributes for debuggability. Adding here allows us to populate these values for sensors in Store query output
3. Correct sensor reading formula from `(value + offset) * scale` to `(value / scale) + offset` for PSUSensor as seen [here](https://github.com/openbmc/dbus-sensors/blob/master/src/psu/PSUSensor.cpp#L238C33-L238C45)
4. Update all unit tests and e2e tests to reflect new changes (note most e2e test reading values change in double precision due to new formula, `hotswap_in` sensor for platform11 had a customized Scale that was previously ignored, this value is now properly calculated)

It is noted that other sensors (I2CFan, HwmonTemp, SharedMem) do not currently support a way to customize scale and factor in EM config based on dbus-sensor implementation, so this is not implemented in this change.

#tlbmc

Tested: see unit tests, on real machine: https://paste.googleplex.com/5482389937324032
PiperOrigin-RevId: 782921389
Change-Id: I166f9c2c1279267e3ab356ebe08ae72a16ac24b8