EVT_UFX_DEVICE_PORT_DETECT callback function (ufxclient.h)

Artikel
02/22/2024

The client driver's implementation to initiate port detection

Syntax

EVT_UFX_DEVICE_PORT_DETECT EvtUfxDevicePortDetect;

void EvtUfxDevicePortDetect(
  [in] UFXDEVICE unnamedParam1
)
{...}

Parameters

[in] unnamedParam1

The handle to a USB device object that the client driver received in a previous call to the UfxDeviceCreate method.

Return value

None

Remarks

The client driver for the function host controller registers its EVT_UFX_DEVICE_PORT_DETECT implementation with the USB function class extension (UFX) by calling the UfxDeviceCreate method.

The client driver must indicate completion of port detection by calling the UfxDevicePortDetectComplete or UfxDevicePortDetectCompleteEx methods.

Examples

EVT_UFX_DEVICE_PORT_DETECT UfxDevice_EvtDevicePortDetect;

VOID
UfxDevice_EvtDevicePortDetect (
    _In_ UFXDEVICE UfxDevice
    )
/*++
Routine Description:

    Starts the port detection state machine

Arguments:

    UfxDevice - UFXDEVICE object representing the device.

--*/
{
    PUFXDEVICE_CONTEXT DeviceContext;
    PCONTROLLER_CONTEXT ControllerContext;

    DeviceContext = UfxDeviceGetContext(UfxDevice);
    ControllerContext = DeviceGetControllerContext(DeviceContext->FdoWdfDevice);

    //
    // #### TODO: Insert code to determine port/charger type ####
    // 
    // In this example we will return an unknown port type.  
    // This will allow UFX to connect to a host if one is present.  
    // UFX will timeout after 5 seconds if no host is present and transition to
    // an invalid charger type, which will allow the controller to exit D0.
    //

    UfxDevicePortDetectComplete(ControllerContext->UfxDevice, UsbfnUnknownPort);
}

Requirements

Requirement	Value
Target Platform	Windows
Minimum KMDF version	1.0
Minimum UMDF version	2.0
Header	ufxclient.h
IRQL	PASSIVE_LEVEL

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