/*++

Copyright (c) Microsoft 1998, All Rights Reserved

Module Name:

    hid.h

Abstract:

    This module contains the declarations and definitions for use with the
    hid user mode client sample driver.

Environment:

    Kernel & user mode

--*/

#ifndef HID_H
#define HID_H

#if _MSC_VER >= 1200
#pragma warning(push)
#endif
#pragma warning(disable:4201) // nameless struct/union

#include "hidsdi.h"
#include "setupapi.h"



typedef struct _SP_FNCLASS_DEVICE_DATA {
   DWORD cbSize;
   GUID  FunctionClassGuid;
   TCHAR DevicePath [ANYSIZE_ARRAY];
} SP_FNCLASS_DEVICE_DATA, *PSP_FNCLASS_DEVICE_DATA;

BOOLEAN
SetupDiGetFunctionClassDeviceInfo (
   IN    HDEVINFO                DeviceInfoSet,
   IN    PSP_DEVINFO_DATA        DeviceInfoData,
   OUT   PSP_FNCLASS_DEVICE_DATA FunctionClassDeviceData,
   IN    DWORD                   FunctionClassDeviceDataSize,
   OUT   PDWORD                  RequiredSize
   );

#define ASSERT(x)

//
// A structure to hold the steady state data received from the hid device.
// Each time a read packet is received we fill in this structure.
// Each time we wish to write to a hid device we fill in this structure.
// This structure is here only for convenience.  Most real applications will
// have a more efficient way of moving the hid data to the read, write, and
// feature routines.
//
typedef struct _HID_DATA {
   BOOLEAN     IsButtonData;
   UCHAR       Reserved;
   USAGE       UsagePage;   // The usage page for which we are looking.
   ULONG       Status;      // The last status returned from the accessor function
                            // when updating this field.
   ULONG       ReportID;    // ReportID for this given data structure
   BOOLEAN     IsDataSet;   // Variable to track whether a given data structure
                            //  has already been added to a report structure

   union {
      struct {
         ULONG       UsageMin;       // Variables to track the usage minimum and max
         ULONG       UsageMax;       // If equal, then only a single usage
         ULONG       MaxUsageLength; // Usages buffer length.
         PUSAGE      Usages;         // list of usages (buttons ``down'' on the device.

      } ButtonData;
      struct {
         USAGE       Usage; // The usage describing this value;
         USHORT      Reserved;

         ULONG       Value;
         LONG        ScaledValue;
      } ValueData;
   };
} HID_DATA, *PHID_DATA;

typedef struct _HID_DEVICE {   
    PCHAR                DevicePath;
    HANDLE               HidDevice; // A file handle to the hid device.
    BOOL                 OpenedForRead;
    BOOL                 OpenedForWrite;
    BOOL                 OpenedOverlapped;
    BOOL                 OpenedExclusive;
    
    PHIDP_PREPARSED_DATA Ppd; // The opaque parser info describing this device
    HIDP_CAPS            Caps; // The Capabilities of this hid device.
    HIDD_ATTRIBUTES      Attributes;

    PCHAR                InputReportBuffer;
    _Field_size_(InputDataLength) 
    PHID_DATA            InputData; // array of hid data structures
    ULONG                InputDataLength; // Num elements in this array.
    PHIDP_BUTTON_CAPS    InputButtonCaps;
    PHIDP_VALUE_CAPS     InputValueCaps;

    PCHAR                OutputReportBuffer;
    _Field_size_(OutputDataLength) 
    PHID_DATA            OutputData;
    ULONG                OutputDataLength;
    PHIDP_BUTTON_CAPS    OutputButtonCaps;
    PHIDP_VALUE_CAPS     OutputValueCaps;

    PCHAR                FeatureReportBuffer;
    _Field_size_(FeatureDataLength) PHID_DATA            FeatureData;
    ULONG                FeatureDataLength;
    PHIDP_BUTTON_CAPS    FeatureButtonCaps;
    PHIDP_VALUE_CAPS     FeatureValueCaps;
} HID_DEVICE, *PHID_DEVICE;


BOOLEAN
OpenHidDevice (
    _In_     LPSTR          DevicePath,
    _In_     BOOL           HasReadAccess,
    _In_     BOOL           HasWriteAccess,
    _In_     BOOL           IsOverlapped,
    _In_     BOOL           IsExclusive,
    _Out_    PHID_DEVICE    HidDevice
);

BOOLEAN
FindKnownHidDevices (
   OUT PHID_DEVICE * HidDevices, // A array of struct _HID_DEVICE
   OUT PULONG        NumberDevices // the length of this array.
   );

BOOLEAN
FillDeviceInfo(
    IN  PHID_DEVICE HidDevice
);

VOID
CloseHidDevices (
   OUT PHID_DEVICE   HidDevices, // A array of struct _HID_DEVICE
   OUT ULONG         NumberDevices // the length of this array.
   );

VOID
CloseHidDevice (
    IN PHID_DEVICE   HidDevice
    );


BOOLEAN
Read (
   PHID_DEVICE    HidDevice
   );

BOOLEAN
ReadOverlapped (
    PHID_DEVICE     HidDevice,
    HANDLE          CompletionEvent
   );
   
BOOLEAN
Write (
   PHID_DEVICE    HidDevice
   );

BOOLEAN
UnpackReport (
   _In_reads_bytes_(ReportBufferLength)PCHAR ReportBuffer,
   IN       USHORT               ReportBufferLength,
   IN       HIDP_REPORT_TYPE     ReportType,
   IN OUT   PHID_DATA            Data,
   IN       ULONG                DataLength,
   IN       PHIDP_PREPARSED_DATA Ppd
   );

BOOLEAN
PackReport (
   _Out_writes_bytes_(ReportBufferLength)PCHAR ReportBuffer,
   IN       USHORT               ReportBufferLength,
   IN       HIDP_REPORT_TYPE     ReportType,
   IN       PHID_DATA            Data,
   IN       ULONG                DataLength,
   IN       PHIDP_PREPARSED_DATA Ppd
   );

BOOLEAN
SetFeature (
   PHID_DEVICE    HidDevice
   );

BOOLEAN
GetFeature (
   PHID_DEVICE    HidDevice
   );

#if _MSC_VER >= 1200
#pragma warning(pop)
#else
#pragma warning(default:4201)
#endif

#endif