tree 921e2a020a8d252266f3781f37b7c6426c2d1e51
parent 0fd07d7dc7eef4dbd1db07f3594bfe555a4be459
author Brandon Wyman <bjwyman@gmail.com> 1574727052 -0600
committer Brandon Wyman <bjwyman@gmail.com> 1583864803 -0500

psu: Updates for power supply presence

Update the JSON file to indicate the minimum and maximum number of power
supplies this system can have.

Update the JSON file to have an array of power supply objects, each with
their various own properties. Each power supply will have:
1) An associated D-Bus path for the inventory. This will have the
   Present property.
2) An associated I2C bus number.
3) An associated I2C bus adddress.

Update PowerSupply class to have a present member variable, an
isPresent() accessor function, and two functions for updating the
presence. One function will be the call back function for either
inventory change events or interface added events, which will use
associated match member variables. The second function being one that
attempts to read the inventory Present property on startup. If reading
the Present property on startup fails, the property changed or interface
added events should work to get the value when that property is
available.

Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
Change-Id: Ib34510a6da66ba1b8f1e927093b3d10b09beb410