/*
	File:		HID_Queue_Utilities.h

	Contains:	Definition of the HID queue functions for the HID utilites.
    
	DRI: George Warner

	Copyright:	Copyright © 2002 Apple Computer, Inc., All Rights Reserved

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*/

#ifndef _HID_Queue_Utilities_h_
#define _HID_Queue_Utilities_h_

#include "HID_Utilities.h"

// ==================================

#ifdef __cplusplus
extern "C" {
#endif

// ==================================

enum
{
    kDeviceQueueSize = 50	// this is wired kernel memory so should be set to as small as possible
							// but should account for the maximum possible events in the queue
							// USB updates will likely occur at 100 Hz so one must account for this rate of
							// if states change quickly (updates are only posted on state changes)
};

// ==================================
// queues specific element, performing any device queue set up required
extern unsigned long  HIDQueueElement (pRecDevice pDevice, pRecElement pElement);

// adds all elements to queue, performing any device queue set up required
extern unsigned long  HIDQueueDevice (pRecDevice pDevice);

// removes element for queue, if last element in queue will release queue and device
extern unsigned long  HIDDequeueElement (pRecDevice pDevice, pRecElement pElement);

// completely removes all elements from queue and releases queue and device
extern unsigned long  HIDDequeueDevice (pRecDevice pDevice);

// releases all device queues for quit or rebuild (must be called)
extern unsigned long  HIDReleaseAllDeviceQueues (void);

// releases interface to device, should be done prior to exiting application (called from HIDReleaseDeviceList)
extern unsigned long  HIDCloseReleaseInterface (pRecDevice pDevice);

// returns true if an event is avialable for the element and fills out *pHIDEvent structure, returns false otherwise
// pHIDEvent is a poiner to a IOHIDEventStruct, using void here for compatibility, users can cast a required
extern unsigned char HIDGetEvent (pRecDevice pDevice, void * pHIDEvent);

// returns current value for element, creating device interface as required, polling element
extern long HIDGetElementValue (pRecDevice pDevice, pRecElement pElement);

// Set an elements value
// NOTE: This should only be used when a single element report needs to be sent.
// If multiple elements reports are to be send then transactions should be used.
extern long HIDSetElementValue (pRecDevice pDevice, pRecElement pElement,IOHIDEventStruct* pIOHIDEvent);

// Set a callback to be called when a queue goes from empty to non-empty
extern long HIDSetQueueCallback (pRecDevice pDevice, IOHIDCallbackFunction callback);

#if 0
// Get a report from a device
extern long HIDGetReport (pRecDevice pDevice,const IOHIDReportType reportType, const UInt32 reportID, void* reportBuffer, UInt32* reportBufferSize);

// Send a report to a device
extern long HIDSetReport (pRecDevice pDevice,const IOHIDReportType reportType, const UInt32 reportID, void* reportBuffer, const UInt32 reportBufferSize);
#endif

#ifdef __cplusplus
}
#endif

#endif // _HID_Queue_Utilities_h_