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Drivers rubric

Overview

This document describes the rules for writing new drivers.

Location

Many drivers are located under /src/devices in folders named according to the driver type. For instance /src/devices/clock/drivers, /src/devices/usb/drivers, etc. Some functional areas include their drivers within their own directories, for instance /src/media/audio/drivers, /src/graphics/drivers, etc. New drivers must be located alongside other drivers of the same type. If there is no existing folder were a new driver should be logically placed under, then a new folder needs to be added to /src/devices, named appropriately and include a drivers folder under it.

OWNERS

As with any other code in Fuchsia an OWNER must approve the addition of a new driver. The OWNERS file to check for approval depends on the location where the driver is added.

Driver Info

When adding a driver to the Fuchsia tree, a driver info file must be created, and the fuchsia_driver_component target must include an info = <some-driver-info.json> entry. The JSON file listed in info must include at least a short_description text and an areas list with entries from areas. For example, aml-g12-tdm-dai-info.json includes:

{
    "short_description": "AMLogic g12 audio subsystem DAI TDM driver",
    "manufacturer": "AMLogic",
    "families": [
        "g12"
    ],
    "models": [
        "S905D2",
        "T931",
        "S905D3"
    ],
    "areas": [
        "Media",
        "Audio"
    ]
}

Note that this file automatically created by fx create driver, see Creating a new driver.