sdk/fidl/fuchsia.driver.compat/compat.fidl

// Copyright 2022 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.driver.compat;

using zx;

type Metadata = resource struct {
    type uint32;
    data zx.handle:VMO;
};

/// This API communicates with the DFv1 parent device.
protocol Device {
    /// Get this device's topological path that it is exporting in /dev.
    GetTopologicalPath() -> (struct {
        path string:MAX;
    });

    /// Get all of the metadata associated with this device.
    GetMetadata() -> (resource struct {
        metadata vector<Metadata>:MAX;
    }) error zx.status;
};

/// This represents a service that the compatibility driver will offer to
/// its children, so that DFv1 drivers can communicate with each other.
/// This is a service because a driver will create one instance per device
/// the driver creates. Each child of the driver gets a single instance of
/// this service.
service Service {
    device client_end:Device;
};