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gpioctl.h

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// gpioctl.h    Include file for Generic Port I/O Example Driver
//
// Define the IOCTL codes we will use.  The IOCTL code contains a command
// identifier, plus other information about the device, the type of access
// with which the file must have been opened, and the type of buffering.
//
// Robert B. Nelson (Microsoft)     March 1, 1993

#ifndef GPIOCTL_H
#define GPIOCTL_H

// Device type           -- in the "User Defined" range."
#define GPD_TYPE 40000

// The IOCTL function codes from 0x800 to 0xFFF are for customer use.

#define IOCTL_GPD_READ_PORT_UCHAR \
    CTL_CODE( GPD_TYPE, 0x900, METHOD_BUFFERED, FILE_READ_ACCESS )

#define IOCTL_GPD_READ_PORT_USHORT \
    CTL_CODE( GPD_TYPE, 0x901, METHOD_BUFFERED, FILE_READ_ACCESS )

#define IOCTL_GPD_READ_PORT_ULONG \
    CTL_CODE( GPD_TYPE, 0x902, METHOD_BUFFERED, FILE_READ_ACCESS )

#define IOCTL_GPD_WRITE_PORT_UCHAR \
    CTL_CODE(GPD_TYPE,  0x910, METHOD_BUFFERED, FILE_WRITE_ACCESS)

#define IOCTL_GPD_WRITE_PORT_USHORT \
    CTL_CODE(GPD_TYPE,  0x911, METHOD_BUFFERED, FILE_WRITE_ACCESS)

#define IOCTL_GPD_WRITE_PORT_ULONG \
    CTL_CODE(GPD_TYPE,  0x912, METHOD_BUFFERED, FILE_WRITE_ACCESS)

typedef struct _GENPORT_WRITE_INPUT
{
  ULONG PortNumber;             // Port # to write to
  union
  {                             // Data to be output to port
    ULONG LongData;
    USHORT ShortData;
    UCHAR CharData;
  };
}
GENPORT_WRITE_INPUT;

#endif

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