função de retorno de chamada EVT_UFX_DEVICE_USB_STATE_CHANGE (ufxclient.h)
A implementação do driver cliente para atualizar o estado do dispositivo USB.
Sintaxe
EVT_UFX_DEVICE_USB_STATE_CHANGE EvtUfxDeviceUsbStateChange;
void EvtUfxDeviceUsbStateChange(
[in] UFXDEVICE unnamedParam1,
[in] USBFN_DEVICE_STATE unnamedParam2
)
{...}
Parâmetros
[in] unnamedParam1
O identificador para um objeto de dispositivo USB que o driver cliente recebeu em uma chamada anterior para o UfxDeviceCreate.
[in] unnamedParam2
Um sinalizador do tipo USBFN_DEVICE_STATE que indica o estado do dispositivo USB.
Retornar valor
Nenhum
Comentários
O driver do cliente para o controlador de host de função registra sua implementação de EVT_UFX_DEVICE_USB_STATE_CHANGE com a extensão de classe de função USB (UFX) chamando o método UfxDeviceCreate .
A UFX invoca esse retorno de chamada de evento para informar o driver cliente sobre o novo estado do dispositivo.
O driver do cliente indica a conclusão desse evento chamando o método UfxDeviceEventComplete .
Exemplos
EVT_UFX_DEVICE_USB_STATE_CHANGE UfxDevice_EvtDeviceUsbStateChange;
VOID
UfxDevice_EvtDeviceUsbStateChange (
_In_ UFXDEVICE UfxDevice,
_In_ USBFN_DEVICE_STATE NewState
)
/*++
Routine Description:
EvtDeviceUsbStateChange handler for the UFXDEVICE object.
Arguments:
UfxDevice - UFXDEVICE object representing the device.
NewState - The new device state.
--*/
{
NTSTATUS Status;
PUFXDEVICE_CONTEXT Context;
PCONTROLLER_CONTEXT ControllerContext;
ULONG EpIndex;
USBFN_DEVICE_STATE OldState;
PAGED_CODE();
TraceEntry();
Context = UfxDeviceGetContext(UfxDevice);
ControllerContext = DeviceGetControllerContext(Context->FdoWdfDevice);
OldState = Context->UsbState;
TraceInformation("New STATE: %d", NewState);
Status = UfxDeviceStopOrResumeIdle(UfxDevice, NewState, Context->UsbPort);
LOG_NT_MSG(Status, "Failed to stop or resume idle");
WdfWaitLockAcquire(ControllerContext->InitializeDefaultEndpointLock, NULL);
if (ControllerContext->InitializeDefaultEndpoint == TRUE) {
//
// Reset endpoint 0. This is the last part of soft reset, which was postponed
// until now, since we need to make sure EP0 is created by UFX.
//
DeviceInitializeDefaultEndpoint(Context->FdoWdfDevice);
ControllerContext->InitializeDefaultEndpoint = FALSE;
}
WdfWaitLockRelease(ControllerContext->InitializeDefaultEndpointLock);
if (NewState == UsbfnDeviceStateConfigured && OldState != UsbfnDeviceStateSuspended) {
for (EpIndex = 1; EpIndex < WdfCollectionGetCount(Context->Endpoints); EpIndex++) {
UfxEndpointConfigure(WdfCollectionGetItem(Context->Endpoints, EpIndex));
}
//
// #### TODO: Insert code to allow the controller to accept U1/U2, if supported ####
//
}
if (NewState == UsbfnDeviceStateDetached) {
KeSetEvent(&ControllerContext->DetachEvent,
IO_NO_INCREMENT,
FALSE);
}
UfxDeviceEventComplete(UfxDevice, STATUS_SUCCESS);
TraceExit();
}
Requisitos
Requisito | Valor |
---|---|
Plataforma de Destino | Windows |
Versão mínima do KMDF | 1.0 |
Versão mínima do UMDF | 2,0 |
Cabeçalho | ufxclient.h |
IRQL | PASSIVE_LEVEL |