system/fidl/ddk/protocols/libs/usb-hub.fidl

// 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 zircon.hw.usb_hub;

[Packed, repr="C"]
struct UsbHighSpeed {
    // variable length depending on number of ports
    array<uint8>:4  DeviceRemovable;
    array<uint8>:4  PortPwrCtrlMask;
};

[Packed, repr="C"]
struct UsbSuperSpeed {
    uint8 bHubHdrDecLat;
    uint16 wHubDelay;
    uint16 DeviceRemovable;
};

[Packed, repr="C"]
union UsbGen {
    /// USB 2.0
    UsbHighSpeed hs;
    /// USB 3.0
    UsbSuperSpeed ss;
};

[Packed, repr="C"]
struct UsbHubDescriptor {
    uint8 bDescLength;
    uint8 bDescriptorType;
    uint8 bNbrPorts;
    uint16 wHubCharacteristics;
    uint8 bPowerOn2PwrGood;
    uint8 bHubContrCurrent;
    UsbGen u;
};