Internal Design
Key classes
- PowerInterface
- Defines the
org.openbmc.control.Power D-Bus interface. - The
state property is set to power the chassis on or off. This contains the desired power state. - The
pgood property contains the actual power state of the chassis.
- PowerControl
- Created in
main(). Handles the event loop. - Sub-class of PowerInterface that provides a concrete implementation of the
org.openbmc.control.Power D-Bus interface. - Finds and loads the JSON configuration file.
- Finds power sequencer device information.
- Creates a sub-class of PowerSequencerDevice that matches power sequencer device information.
- Powers the chassis on and off using the
power-chassis-control named GPIO. - Monitors the chassis pgood status every 3 seconds using the
power-chassis-good named GPIO. - Enforces a minimum power off time of 15 seconds from cold start and 25 seconds from power off.
- DeviceFinder
- Finds power sequencer device information on D-Bus published by EntityManager.
- Rail
- A voltage rail that is enabled or monitored by the power sequencer device.
- PowerSequencerDevice
- Abstract base class for a power sequencer device.
- Defines virtual methods that must be implemented by all child classes.
- StandardDevice
- Sub-class of PowerSequencerDevice that implements the standard pgood fault detection algorithm.
- PMBusDriverDevice
- Sub-class of StandardDevice for power sequencer devices that are bound to a PMBus device driver.
- UCD90xDevice
- Sub-class of PMBusDriverDevice for the UCD90X family of power sequencer devices.
- UCD90160Device
- Sub-class of UCD90xDevice representing a UCD90160 power sequencer device.
- UCD90320Device
- Sub-class of UCD90xDevice representing a UCD90320 power sequencer device.
- Services
- Abstract base class that provides an interface to system services like error logging and the journal.
- BMCServices
- Sub-class of Services with real implementation of methods.
- MockServices
- Sub-class of Services with mock implementation of methods for automated testing.