system/banjo/ddk-protocol-platform-proxy/platform-proxy.banjo

// Copyright 2018 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 ddk.protocol.platform.proxy;

using zx;

const uint32 PLATFORM_PROXY_MAX_DATA = 4096;

/// Header for RPC requests.
struct PlatformProxyReq {
    uint32 txid;
    uint32 device_id;
    uint32 proto_id;
    uint32 op;
};

/// Header for RPC responses.
struct PlatformProxyRsp {
    uint32 txid;
    zx.status status;
};

[Layout = "ddk-protocol"]
interface PlatformProxy {
    /// Used by protocol client drivers to register their local protocol implementation
    /// with the platform proxy driver.
    RegisterProtocol(uint32 proto_id, vector<voidptr> protocol) -> (zx.status s);
    /// Used by protocol client drivers to proxy a protocol call to the protocol implementation
    /// driver in the platform bus driver's devhost.
    Proxy(vector<voidptr> req, vector<handle> req_handle) -> (zx.status s, vector<voidptr> resp,
                                                              vector<handle> resp_handle);
};