kbdclass.h

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#ifndef _KBDCLASS_PCH_
#define _KBDCLASS_PCH_

#include <ntifs.h>
#include <ntddkbd.h>

#define MAX_PATH 260

#define MIN(a, b) ((a) < (b) ? (a) : (b))

#define CLASS_TAG 'CdbK'
#define DPFLTR_CLASS_NAME_ID DPFLTR_KBDCLASS_ID

typedef enum
{
    dsStopped,
    dsStarted,
    dsPaused,
    dsRemoved,
    dsSurpriseRemoved
} PORT_DEVICE_STATE;

typedef struct _CLASS_DRIVER_EXTENSION
{
    UNICODE_STRING RegistryPath;

    /* Registry settings */
    ULONG ConnectMultiplePorts;
    ULONG DataQueueSize;
    UNICODE_STRING DeviceBaseName;

    PDEVICE_OBJECT MainClassDeviceObject;
} CLASS_DRIVER_EXTENSION, *PCLASS_DRIVER_EXTENSION;

typedef struct _COMMON_DEVICE_EXTENSION
{
    BOOLEAN IsClassDO;
} COMMON_DEVICE_EXTENSION, *PCOMMON_DEVICE_EXTENSION;

typedef struct _PORT_DEVICE_EXTENSION
{
    COMMON_DEVICE_EXTENSION Common;

    LIST_ENTRY ListEntry;
    PDEVICE_OBJECT DeviceObject;
    PORT_DEVICE_STATE PnpState;
    PDEVICE_OBJECT LowerDevice;
    PDEVICE_OBJECT ClassDO;
    HANDLE FileHandle;
    UNICODE_STRING InterfaceName;
} PORT_DEVICE_EXTENSION, *PPORT_DEVICE_EXTENSION;

typedef struct _CLASS_DEVICE_EXTENSION
{
    COMMON_DEVICE_EXTENSION Common;

    PCLASS_DRIVER_EXTENSION DriverExtension;

    LIST_ENTRY ListHead;
    KSPIN_LOCK ListSpinLock;
    KSPIN_LOCK SpinLock;
    PIRP PendingIrp;
    SIZE_T InputCount;
    PKEYBOARD_INPUT_DATA PortData;
    LPCWSTR DeviceName;
} CLASS_DEVICE_EXTENSION, *PCLASS_DEVICE_EXTENSION;

/* misc.c */

NTSTATUS
ForwardIrpAndWait(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp);

DRIVER_DISPATCH ForwardIrpAndForget;

NTSTATUS
DuplicateUnicodeString(
    IN ULONG Flags,
    IN PCUNICODE_STRING SourceString,
    OUT PUNICODE_STRING DestinationString);

#endif /* _KBDCLASS_PCH_ */