Sample Code
Windows Driver Samples/ Toaster Sample Driver/ C++/ kmdf/ toastmon/ wmi.c/
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 | /*++ Copyright (c) Microsoft Corporation. All rights reserved. THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE. Module Name: wmi.c Abstract: This module demonstrates how to receive WMI notification fired by another driver. The code here basically registers for toaster device arrival WMI notification fired by the toaster function driver. You can use similar technique to receive media sense notification (GUID_NDIS_STATUS_MEDIA_CONNECT/GUID_NDIS_STATUS_MEDIA_DISCONNECT) fired by NDIS whenever the network cable is plugged or unplugged. Environment: Kernel mode --*/ #include "toastmon.h" #include "public.h" #include <wmistr.h> // // These typedefs required to avoid compilation errors in Win2K build environment. // typedef VOID (*WMI_NOTIFICATION_CALLBACK)( // Copied from WDM.H PVOID Wnode, PVOID Context ); typedef NTSTATUS (*PFN_IO_WMI_OPEN_BLOCK)( IN GUID * DataBlockGuid, IN ULONG DesiredAccess, OUT PVOID * DataBlockObject ); typedef NTSTATUS (*PFN_IO_WMI_SET_NOTIFICATION_CALLBACK)( IN PVOID Object, IN WMI_NOTIFICATION_CALLBACK Callback, IN PVOID Context ); NTSTATUS GetTargetFriendlyName( WDFIOTARGET Target, IN WDFMEMORY* TargetName ); #ifdef ALLOC_PRAGMA #pragma alloc_text(PAGE, RegisterForWMINotification) #pragma alloc_text(PAGE, UnregisterForWMINotification) #pragma alloc_text(PAGE, GetTargetFriendlyName) #pragma alloc_text(PAGE, WmiNotificationCallback) #endif NTSTATUS RegisterForWMINotification( PDEVICE_EXTENSION DeviceExt ) { NTSTATUS status = STATUS_SUCCESS; GUID wmiGuid; UNICODE_STRING funcName; PFN_IO_WMI_OPEN_BLOCK WmiOpenBlock; PFN_IO_WMI_SET_NOTIFICATION_CALLBACK WmiSetNotificationCallback; PAGED_CODE(); // // APIs to open WMI interfaces are available on XP and beyond, so let us // first check to see whether there are exported in the kernel we are // running before using them. // RtlInitUnicodeString(&funcName, L "IoWMIOpenBlock" ); WmiOpenBlock = (PFN_IO_WMI_OPEN_BLOCK) ( ULONG_PTR ) MmGetSystemRoutineAddress(&funcName); RtlInitUnicodeString(&funcName, L "IoWMISetNotificationCallback" ); WmiSetNotificationCallback = (PFN_IO_WMI_SET_NOTIFICATION_CALLBACK) ( ULONG_PTR ) MmGetSystemRoutineAddress(&funcName); if (WmiOpenBlock == NULL || WmiSetNotificationCallback == NULL) { // // Not available. // return STATUS_NOT_SUPPORTED; } // // Check to make sure we are not called multiple times. // ASSERT(DeviceExt->WMIDeviceArrivalNotificationObject == NULL); // // Register WMI callbacks for toaster device arrival events // wmiGuid = TOASTER_NOTIFY_DEVICE_ARRIVAL_EVENT; status = WmiOpenBlock( &wmiGuid, WMIGUID_NOTIFICATION, &DeviceExt->WMIDeviceArrivalNotificationObject ); if (!NT_SUCCESS(status)) { KdPrint(( "Unable to open wmi data block status 0x%x\n" , status)); DeviceExt->WMIDeviceArrivalNotificationObject = NULL; } else { status = WmiSetNotificationCallback( DeviceExt->WMIDeviceArrivalNotificationObject, WmiNotificationCallback, DeviceExt ); if (!NT_SUCCESS(status)) { KdPrint(( "Unable to register for wmi notification 0x%x\n" , status)); ObDereferenceObject(DeviceExt->WMIDeviceArrivalNotificationObject); DeviceExt->WMIDeviceArrivalNotificationObject = NULL; } } return status; } VOID UnregisterForWMINotification( PDEVICE_EXTENSION DeviceExt ) { PAGED_CODE(); if (DeviceExt->WMIDeviceArrivalNotificationObject != NULL) { ObDereferenceObject(DeviceExt->WMIDeviceArrivalNotificationObject); DeviceExt->WMIDeviceArrivalNotificationObject = NULL; } } NTSTATUS GetTargetFriendlyName( WDFIOTARGET Target, IN WDFMEMORY* TargetName ) /*++ Routine Description: Return the friendly name associated with the given device object. Arguments: Return Value: NT status --*/ { NTSTATUS status; PAGED_CODE(); // // First get the length of the string. If the FriendlyName // is not there then get the lenght of device description. // status = WdfIoTargetAllocAndQueryTargetProperty(Target, DevicePropertyFriendlyName, NonPagedPool, WDF_NO_OBJECT_ATTRIBUTES, TargetName); if (!NT_SUCCESS(status) && status != STATUS_INSUFFICIENT_RESOURCES) { status = WdfIoTargetAllocAndQueryTargetProperty(Target, DevicePropertyDeviceDescription, NonPagedPool, WDF_NO_OBJECT_ATTRIBUTES, TargetName); } if (!NT_SUCCESS(status)) { KdPrint(( "WdfDeviceQueryProperty returned %x\n" , status)); } return status; } VOID WmiNotificationCallback( IN PVOID Wnode, IN PVOID Context ) /*++ Routine Description: WMI calls this function to notify the caller that the specified event has occurred. Arguments: Wnode - points to the WNODE_EVENT_ITEM structure returned by the driver triggering the event. Context - points to the value specified in the Context parameter of the IoWMISetNotificationCallback routine. Return Value: NT status --*/ { PWNODE_SINGLE_INSTANCE wnode = (PWNODE_SINGLE_INSTANCE) Wnode; WDFMEMORY memory; UNICODE_STRING deviceName; PDEVICE_OBJECT devobj; NTSTATUS status; PDEVICE_EXTENSION deviceExt = Context; WDFCOLLECTION hCollection = deviceExt->TargetDeviceCollection; WDFIOTARGET ioTarget; ULONG i; PAGED_CODE(); WdfWaitLockAcquire(deviceExt->TargetDeviceCollectionLock, NULL); for (i=0; i< WdfCollectionGetCount(hCollection); i++){ ioTarget = WdfCollectionGetItem(hCollection, i); // // Before calling WdfIoTargetWdmGetTargetDeviceObject, make sure the target is still open. // The WdfIoTargetWdmGetXxxDeviceObject APIs can only be called while the target is opened, otherwise // they can return undefined values. // if (GetTargetDeviceInfo(ioTarget)->Opened == FALSE) { KdPrint(( "WDFIOTARGET %p not in an opened state.\n" , ioTarget)); continue ; } devobj = WdfIoTargetWdmGetTargetDeviceObject(ioTarget); if (devobj && IoWMIDeviceObjectToProviderId(devobj) == wnode->WnodeHeader.ProviderId) { if ( IsEqualGUID( (LPGUID)&(wnode->WnodeHeader.Guid), (LPGUID)&TOASTER_NOTIFY_DEVICE_ARRIVAL_EVENT) ) { // // found the device. Just for demonstration, get the friendlyname of the // target device and print it. // status = GetTargetFriendlyName(ioTarget, &memory); if (!NT_SUCCESS(status)) { KdPrint(( "GetDeviceFriendlyName returned %x\n" , status)); break ; } RtlInitUnicodeString(&deviceName, ( PWSTR ) WdfMemoryGetBuffer(memory, NULL)); KdPrint(( "%wZ fired a device arrival event\n" , &deviceName)); // // Free the memory allocated by GetDeviceFriendlyName. // WdfObjectDelete(memory); break ; } else { KdPrint(( "Unknown event.\n" )); } } } WdfWaitLockRelease(deviceExt->TargetDeviceCollectionLock); } |
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