Conformance

The normative text is in spec/v0.1/drivers.md, and this page summarizes that text.

OpenHAL has three Conformance Levels, and each level includes the level below it.

Level	A Hub implements	A Driver supports
core	Initialize, list, describe, read, read many and hal/value	Identify, connect, describe, read and close
control	Core plus channel changes, dry run, plan check, stop, unlock, hal/blocked and hal/stopped, all through a Safety Kernel that meets the safety section	Core plus channel changes through Grants and a safe state
full	Control plus actions, confirmations, routines, the audit query and hal/confirmationRequested	Control plus actions through Grants

• A Hub declares its level in the hal/initialize result and returns METHOD_NOT_FOUND for methods above that level, and the reference Hub is full.
• A Driver declares its level in DriverInfo.conformance, and a read-only camera Driver, for example, is core.
• The conformance suite in openhal/conformance/suite.py tests the declared level and nothing above it. Run the suite with uv run pytest tests/conformance.

The drivers section lists every check and its level.