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/*
	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

	Disclaimer:	IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
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				constitutes acceptance of these terms.  If you do not agree with these terms,
				please do not use, install, modify or redistribute this Apple software.

				In consideration of your agreement to abide by the following terms, and subject
				to these terms, Apple grants you a personal, non-exclusive license, under Apple’s
				copyrights in this original Apple software (the "Apple Software"), to use,
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				are granted by Apple herein, including but not limited to any patent rights that
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				Software may be incorporated.

				The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
				WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
				WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
				PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
				COMBINATION WITH YOUR PRODUCTS.

				IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
				CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
				GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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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_