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annotate USBLib/Windows/USB/UsbHub.cs @ 63:309c705d7460

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Updates and cleanup in Windows USB enumeration code
author Ivo Smits <Ivo@UCIS.nl>
date Sun, 13 Oct 2013 18:43:45 +0200
parents edc41c861d96
children e811297f5aa4
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1 using System;
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2 using System.Collections.Generic;
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3 using System.ComponentModel;
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4 using System.Runtime.InteropServices;
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5 using Microsoft.Win32.SafeHandles;
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6 using UCIS.HWLib.Windows.Devices;
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7 using UCIS.USBLib.Internal.Windows;
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9 namespace UCIS.HWLib.Windows.USB {
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10 public class UsbHub : UsbDevice {
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11 internal static SafeFileHandle OpenHandle(String path) {
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12 SafeFileHandle handle = Kernel32.CreateFile(path, Kernel32.GENERIC_WRITE, Kernel32.FILE_SHARE_WRITE, IntPtr.Zero, Kernel32.OPEN_EXISTING, 0, IntPtr.Zero);
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13 if (handle.IsInvalid) throw new Win32Exception(Marshal.GetLastWin32Error());
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14 return handle;
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15 }
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17 private Boolean HasNodeInformation = false;
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18 private USB_NODE_INFORMATION NodeInformation;
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20 private void GetNodeInformation() {
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21 if (HasNodeInformation) return;
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22 NodeInformation = new USB_NODE_INFORMATION();
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23 int nBytes = Marshal.SizeOf(typeof(USB_NODE_INFORMATION));
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24 using (SafeFileHandle handle = OpenHandle())
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25 if (!Kernel32.DeviceIoControl(handle, UsbApi.IOCTL_USB_GET_NODE_INFORMATION, ref NodeInformation, nBytes, out NodeInformation, nBytes, out nBytes, IntPtr.Zero))
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26 throw new Win32Exception(Marshal.GetLastWin32Error());
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27 }
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29 public bool IsRootHub { get; private set; }
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30 public int PortCount { get { GetNodeInformation(); return NodeInformation.HubInformation.HubDescriptor.bNumberOfPorts; } }
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31 public bool IsBusPowered { get { GetNodeInformation(); return NodeInformation.HubInformation.HubIsBusPowered; } }
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32 public override string DeviceDescription { get { return IsRootHub ? "Root hub" : base.DeviceDescription; } }
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34 public String DevicePath { get; private set; }
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36 internal UsbHub(UsbHub parent, string devicePath, uint port)
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37 : base(null, parent, port) {
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38 this.DevicePath = devicePath;
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39 this.IsRootHub = (parent == null);
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40 if (IsRootHub) SetNodeConnectionInfo(new USB_NODE_CONNECTION_INFORMATION_EX());
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41 }
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43 private UsbHub(DeviceNode devnode, string devicePath)
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44 : base(devnode, null, 0) {
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45 this.DevicePath = devicePath;
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46 this.IsRootHub = false;
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47 }
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49 internal SafeFileHandle OpenHandle() {
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50 return OpenHandle(DevicePath);
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51 }
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53 public IList<UsbDevice> Devices {
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54 get {
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55 UsbDevice[] devices = new UsbDevice[PortCount];
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56 using (SafeFileHandle handle = OpenHandle()) {
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57 for (uint index = 1; index <= PortCount; index++) {
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58 USB_NODE_CONNECTION_INFORMATION_EX nodeConnection = GetNodeConnectionInformation(handle, index);
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59 UsbDevice device;
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60 if (nodeConnection.ConnectionStatus != USB_CONNECTION_STATUS.DeviceConnected) {
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61 device = new UsbDevice(null, this, index);
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62 } else if (nodeConnection.DeviceDescriptor.DeviceClass == (Byte)UsbDeviceClass.HubDevice) {
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63 int nBytes = Marshal.SizeOf(typeof(USB_NODE_CONNECTION_NAME));
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64 USB_NODE_CONNECTION_NAME nameConnection = new USB_NODE_CONNECTION_NAME();
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65 nameConnection.ConnectionIndex = index;
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66 if (!Kernel32.DeviceIoControl(handle, UsbApi.IOCTL_USB_GET_NODE_CONNECTION_NAME, ref nameConnection, nBytes, out nameConnection, nBytes, out nBytes, IntPtr.Zero))
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67 throw new Win32Exception(Marshal.GetLastWin32Error());
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68 device = new UsbHub(this, @"\\?\" + nameConnection.NodeName, index);
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69 } else {
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70 device = new UsbDevice(null, this, index);
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71 }
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72 device.SetNodeConnectionInfo(nodeConnection);
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73 devices[index - 1] = device;
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74 }
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75 }
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76 return devices;
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77 }
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78 }
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80 static readonly Guid IID_DEVINTERFACE_USB_HUB = new Guid(UsbApi.GUID_DEVINTERFACE_USB_HUB);
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81 public static UsbHub GetHubForDeviceNode(DeviceNode node) {
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82 if (node == null) return null;
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83 String[] interfaces = node.GetInterfaces(IID_DEVINTERFACE_USB_HUB);
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84 if (interfaces == null || interfaces.Length == 0) return null;
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85 return new UsbHub(node, interfaces[0]);
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86 }
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88 public static IList<UsbHub> GetHubs() {
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89 IList<UsbHub> devices = new List<UsbHub>();
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90 foreach (DeviceNode dev in DeviceNode.GetDevices(IID_DEVINTERFACE_USB_HUB)) {
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91 UsbHub hub = GetHubForDeviceNode(dev);
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92 if (hub != null) devices.Add(hub);
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93 }
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94 return devices;
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95 }
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96
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97 public UsbDevice FindChildForDeviceNode(DeviceNode node) {
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98 String driverkey = node.DriverKey;
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99 if (driverkey != null) {
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100 foreach (UsbDevice child in Devices) if (driverkey.Equals(child.DriverKey, StringComparison.InvariantCultureIgnoreCase)) return child;
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101 } else {
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102 int? address = node.Address;
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103 if (address == null || address.Value == 0) return null;
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104 int port = address.Value;
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105 foreach (UsbDevice child in Devices) if (port == child.AdapterNumber) return child;
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106 }
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107 return null;
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108 }
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109 }
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110 }