/*
	File:		HID_Queue_Utilities.c

	Contains:	Implementation 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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*/

//#include <IOKit/hid/IOHIDDevice.h>

#include "HID_Utilities_Internal.h"
#include "HID_Utilities_External.h"

// ==================================
// compiler directives
// ==================================
#define USE_ASYNC_EVENTS TRUE
#define REPORT_ERRORS FALSE
// ==================================
#if REPORT_ERRORS
#define HIDREPORTERRORNUM(s,n) HIDReportErrorNum(s,n)
#define HIDREPORTERROR(s)		HIDReportError(s)
#else
#define HIDREPORTERRORNUM(s,n)	do {} while (false)
#define HIDREPORTERROR(s)		do {} while (false)
#endif
// ==================================
// private functions
// ==================================

// creates a queue for a device

static IOReturn hid_CreateQueue (pRecDevice pDevice)
{
    IOReturn result = kIOReturnError;	// assume failure (pessimist!)

	if (HIDIsValidDevice(pDevice))
	{
		if (NULL == pDevice->queue) // do we already have a queue
		{
			if (NULL != pDevice->interface)
			{
				pDevice->queue = (void *) (*(IOHIDDeviceInterface**) pDevice->interface)->allocQueue (pDevice->interface); // alloc queue
				if (pDevice->queue)
				{
					result = (*(IOHIDQueueInterface**) pDevice->queue)->create (pDevice->queue, 0, kDeviceQueueSize); // create actual queue
					if (kIOReturnSuccess != result)
						HIDREPORTERRORNUM ("hid_CreateQueue - Failed to create queue via create", result);
				}
				else
				{
					HIDREPORTERROR ("hid_CreateQueue - Failed to alloc IOHIDQueueInterface ** via allocQueue");
					result = kIOReturnError; // synthesis error
				}
			}
			else
				HIDREPORTERRORNUM ("hid_CreateQueue - Device inteface does not exist for queue creation", result);
		}
	}
	else
		HIDREPORTERRORNUM ("hid_CreateQueue - Invalid Device", result);
    return result;
}

// ---------------------------------
// returns true if queue is empty false otherwise
// error if no device, empty if no queue

static unsigned char hid_IsDeviceQueueEmpty (pRecDevice pDevice)
{
	if (HIDIsValidDevice(pDevice))	// need valid device
	{
		if (pDevice->queue) // and queue
		{
			pRecElement pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeIO);
			while (pElement)
			{
				if ((*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie))
					return false;
				pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
			} 
		}
		else
			HIDREPORTERROR ("hid_IsDeviceQueueEmpty - no queue.");
	}
	else
		HIDREPORTERROR ("hid_IsDeviceQueueEmpty - Invalid device.");
	return true;   
}

// ---------------------------------
// disposes and releases queue, sets queue to NULL,.
// Note: will have no effect if device or queue do not exist

static IOReturn hid_DisposeReleaseQueue (pRecDevice pDevice)
{
    IOReturn result = kIOReturnError;	// assume failure (pessimist!)

	if (HIDIsValidDevice(pDevice))	// need valid device
	{
		if (pDevice->queue) // and queue
		{
			// stop queue
			result = (*(IOHIDQueueInterface**) pDevice->queue)->stop (pDevice->queue);
			if (kIOReturnSuccess != result)
				HIDREPORTERRORNUM ("hid_DisposeReleaseQueue - Failed to stop queue.", result);
			// dispose of queue
			result = (*(IOHIDQueueInterface**) pDevice->queue)->dispose (pDevice->queue);
			if (kIOReturnSuccess != result)
				HIDREPORTERRORNUM ("hid_DisposeReleaseQueue - Failed to dipose queue.", result);
			// release the queue
			result = (*(IOHIDQueueInterface**) pDevice->queue)->Release (pDevice->queue);
			if (kIOReturnSuccess != result)
				HIDREPORTERRORNUM ("hid_DisposeReleaseQueue - Failed to release queue.", result);

			pDevice->queue = NULL;
		}
		else
			HIDREPORTERROR ("hid_DisposeReleaseQueue - no queue.");
	}
	else
		HIDREPORTERROR ("hid_DisposeReleaseQueue - Invalid device.");
    return result;
}

// ==================================
// public functions

// ---------------------------------
// queues specific element, performing any device queue set up required
// queue is started and ready to return events on exit from this function

unsigned long  HIDQueueElement (pRecDevice pDevice, pRecElement pElement)
{
    IOReturn result = kIOReturnError;	// assume failure (pessimist!)

	if (HIDIsValidElement(pDevice,pElement))
	{
		if (NULL == pDevice->interface) // must have interface
		{
			HIDREPORTERROR ("HIDQueueElement - Device does not have interface.");
			return kIOReturnError;
		}
		if (NULL == pDevice->queue) // if no queue create queue
			result = hid_CreateQueue (pDevice);
		if ((kIOReturnSuccess != result) || (NULL == pDevice->queue))
		{
			HIDREPORTERRORNUM ("HIDQueueElement - problem creating queue.", result);
			if (kIOReturnSuccess != result)
				return result;
			else
				return kIOReturnError;
		}

		// stop queue
		result = (*(IOHIDQueueInterface**) pDevice->queue)->stop (pDevice->queue);
		if (kIOReturnSuccess != result)
			HIDREPORTERROR ("HIDQueueElement - Failed to stop queue.");

		// queue element
		if (!(*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie))
		{
			result = (*(IOHIDQueueInterface**) pDevice->queue)->addElement (pDevice->queue, pElement->cookie, 0);
			if (kIOReturnSuccess != result)
				HIDREPORTERROR ("HIDQueueElement - Failed to add Element to queue.");
		}

		// restart queue
		result = (*(IOHIDQueueInterface**) pDevice->queue)->start (pDevice->queue);
		if (kIOReturnSuccess != result)
			HIDREPORTERROR ("HIDQueueElement - Failed to start queue.");
	}
	else
	{
		HIDREPORTERROR ("HIDQueueElement - Invalid Device and/or element.");
        return kIOReturnBadArgument;
	}

   return result;
}

// ---------------------------------
// adds all elements to queue, performing any device queue set up required
// queue is started and ready to return events on exit from this function

unsigned long  HIDQueueDevice (pRecDevice pDevice)
{
    IOReturn result = kIOReturnError;	// assume failure (pessimist!)
    pRecElement pElement;

	if (HIDIsValidDevice(pDevice))
	{
		// error checking
		if (NULL == pDevice)
		{
			HIDREPORTERROR ("HIDQueueDevice - Device does not exist.");
			return kIOReturnBadArgument;
		}
		if (NULL == pDevice->interface) // must have interface
		{
			HIDREPORTERROR ("HIDQueueDevice - Device does not have interface.");
			return kIOReturnError;
		}
		if (NULL == pDevice->queue) // if no queue create queue
			result = hid_CreateQueue (pDevice);
		if ((kIOReturnSuccess != result) || (NULL == pDevice->queue))
		{
			HIDREPORTERRORNUM ("HIDQueueDevice - problem creating queue.", result);
			if (kIOReturnSuccess != result)
				return result;
			else
				return kIOReturnError;
		}

		// stop queue
		result = (*(IOHIDQueueInterface**) pDevice->queue)->stop (pDevice->queue);
		if (kIOReturnSuccess != result)
			HIDREPORTERRORNUM ("HIDQueueDevice - Failed to stop queue.", result);

		// queue element
  //¥ pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeIO);
		pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeInput | kHIDElementTypeFeature);

		while (pElement)
		{
			if (!(*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie))
			{
				result = (*(IOHIDQueueInterface**) pDevice->queue)->addElement (pDevice->queue, pElement->cookie, 0);
				if (kIOReturnSuccess != result)
					HIDREPORTERRORNUM ("HIDQueueDevice - Failed to add element to queue.", result);
			}
			//¥ pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
			pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeInput | kHIDElementTypeFeature);
		}

		// start queue
		result = (*(IOHIDQueueInterface**) pDevice->queue)->start (pDevice->queue);
		if (kIOReturnSuccess != result)
			HIDREPORTERRORNUM ("HIDQueueDevice - Failed to start queue.", result);
		
	}
	else
		HIDREPORTERROR ("HIDQueueDevice - Invalid device.");

    return result;
}

// ---------------------------------
// removes element for queue, if last element in queue will release queue and closes device interface

unsigned long  HIDDequeueElement (pRecDevice pDevice, pRecElement pElement)
{
    IOReturn result = kIOReturnError;	// assume failure (pessimist!)

	if (HIDIsValidElement(pDevice,pElement))
	{
		if (!pDevice || !pElement)
			result = kIOReturnBadArgument;
		else
		{
			if ((pDevice->interface) && (pDevice->queue))
			{
				// stop queue
				result = (*(IOHIDQueueInterface**) pDevice->queue)->stop (pDevice->queue);
				if (kIOReturnSuccess != result)
					HIDREPORTERRORNUM ("HIDDequeueElement - Failed to stop queue.", result);

				if ((*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie)) // if has element then remove
				{
					result = (*(IOHIDQueueInterface**) pDevice->queue)->removeElement (pDevice->queue, pElement->cookie);
					if (kIOReturnSuccess != result)
						HIDREPORTERRORNUM ("HIDDequeueElement - Failed to add element to queue", result);
				}

				if (hid_IsDeviceQueueEmpty (pDevice)) // release device queue and close interface if queue empty
				{
					result = hid_DisposeReleaseQueue (pDevice);
					if (kIOReturnSuccess != result)
						HIDREPORTERRORNUM ("HIDDequeueElement - Failed to dispose and release queue.", result);
				}
				else // not empty so restart queue
				{
					result = (*(IOHIDQueueInterface**) pDevice->queue)->start (pDevice->queue);
					if (kIOReturnSuccess != result)
						HIDREPORTERRORNUM ("HIDDequeueElement - Failed to start queue.", result);
				}
			}
			else
			{
				HIDREPORTERROR ("HIDDequeueElement - No device inteface or queue.");
				return kIOReturnError;
			}
		}
	}
	else
		HIDREPORTERROR ("HIDDequeueElement - Invalid device.");

    return result;
}

// ---------------------------------
// completely removes all elements from queue and releases queue and closes device interface
// does not release device interfaces, application must call HIDReleaseDeviceList on exit

unsigned long  HIDDequeueDevice (pRecDevice pDevice)
{
    IOReturn result = kIOReturnSuccess;

    if (HIDIsValidDevice(pDevice))
	{
		if ((pDevice->interface) && (pDevice->queue))
		{
			// iterate through elements and if queued, remove
			pRecElement pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeIO);
			while (pElement)
			{
				if ((*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie))
				{
					result = (*(IOHIDQueueInterface**) pDevice->queue)->removeElement (pDevice->queue, pElement->cookie);
					if (kIOReturnSuccess != result)
						HIDREPORTERRORNUM ("HIDDequeueDevice - Failed to remove element from queue.", result);
				}
				pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
			}
		}
		// ensure queue is disposed and released
		// interface will be closed and released on call to HIDReleaseDeviceList
		result = hid_DisposeReleaseQueue (pDevice);
		if (kIOReturnSuccess != result)
			HIDREPORTERRORNUM ("removeElement - Failed to dispose and release queue.", result);
#if USE_ASYNC_EVENTS
		else if (NULL != pDevice->queueRunLoopSource)
		{
			if (CFRunLoopContainsSource(CFRunLoopGetCurrent(), pDevice->queueRunLoopSource, kCFRunLoopDefaultMode))
				CFRunLoopRemoveSource(CFRunLoopGetCurrent(), pDevice->queueRunLoopSource, kCFRunLoopDefaultMode);
			CFRelease(pDevice->queueRunLoopSource);
			pDevice->queueRunLoopSource = NULL;
		}
#endif USE_ASYNC_EVENTS
	}
	else
	{
		HIDREPORTERROR ("HIDDequeueDevice - Invalid device.");
		result = kIOReturnBadArgument;
	}
    return result;
}

// ---------------------------------
// releases all device queues for quit or rebuild (must be called)
// does not release device interfaces, application must call HIDReleaseDeviceList on exit

unsigned long HIDReleaseAllDeviceQueues (void)
{
    IOReturn result = kIOReturnBadArgument;
    pRecDevice pDevice = HIDGetFirstDevice ();

    while (pDevice)
    {
        result = HIDDequeueDevice (pDevice);
        if (kIOReturnSuccess != result)
            HIDREPORTERRORNUM ("HIDReleaseAllDeviceQueues - Could not dequeue device.", result);
        pDevice = HIDGetNextDevice (pDevice);
    }
    return result;
}

// ---------------------------------
// Closes and releases interface to device, should be done prior to exting application
// Note: will have no affect if device or interface do not exist
// application will "own" the device if interface is not closed
// (device may have to be plug and re-plugged in different location to get it working again without a restart)

unsigned long HIDCloseReleaseInterface (pRecDevice pDevice)
{
	IOReturn result = kIOReturnSuccess;
	
	if (HIDIsValidDevice(pDevice) && (NULL != pDevice->interface))
	{
		// close the interface
		result = (*(IOHIDDeviceInterface**) pDevice->interface)->close (pDevice->interface);
		if (kIOReturnNotOpen == result)
		{
			//  do nothing as device was not opened, thus can't be closed
		}
		else if (kIOReturnSuccess != result)
			HIDREPORTERRORNUM ("HIDCloseReleaseInterface - Failed to close IOHIDDeviceInterface.", result);
		//release the interface
		result = (*(IOHIDDeviceInterface**) pDevice->interface)->Release (pDevice->interface);
		if (kIOReturnSuccess != result)
			HIDREPORTERRORNUM ("HIDCloseReleaseInterface - Failed to release interface.", result);
		pDevice->interface = NULL;
	}	
	return result;
}      

// ---------------------------------
// Get the next event in the queue for a device
// elements or entire device should be queued prior to calling this with HIDQueueElement or HIDQueueDevice
// returns true if an event is avialable for the element and fills out *pHIDEvent structure, returns false otherwise
// Note: kIOReturnUnderrun returned from getNextEvent indicates an empty queue not an error condition
// Note: application should pass in a pointer to a IOHIDEventStruct cast to a void (for CFM compatibility)

unsigned char HIDGetEvent (pRecDevice pDevice, void * pHIDEvent)
{
    IOReturn result = kIOReturnBadArgument;
    AbsoluteTime zeroTime = {0,0};

    if (HIDIsValidDevice(pDevice))
	{
		if (pDevice->queue)
		{
			result = (*(IOHIDQueueInterface**) pDevice->queue)->getNextEvent (pDevice->queue, (IOHIDEventStruct *)pHIDEvent, zeroTime, 0);
			if (kIOReturnUnderrun == result)
				return false;  // no events in queue not an error per say
			else if (kIOReturnSuccess != result) // actual error versus just an empty queue
				HIDREPORTERRORNUM ("HIDGetEvent - Could not get HID event via getNextEvent.", result);
			else
				return true;
		}
		else
			HIDREPORTERROR ("HIDGetEvent - queue does not exist.");
	}
	else
		HIDREPORTERROR ("HIDGetEvent - invalid device.");

    return false; // did not get event
}

// ---------------------------------
// returns current value for element, polling element
// will return 0 on error conditions which should be accounted for by application

long HIDGetElementValue (pRecDevice pDevice, pRecElement pElement)
{
    IOReturn result = kIOReturnBadArgument;
    IOHIDEventStruct hidEvent;

	hidEvent.value = 0;
    hidEvent.longValueSize = 0;
	hidEvent.longValue = nil;

	if (HIDIsValidElement(pDevice, pElement))
	{
		if (NULL != pDevice->interface)
		{
			// ++ NOTE: If the element type is feature then use queryElementValue instead of getElementValue
			if (kIOHIDElementTypeFeature == pElement->type)
			{
				result = (*(IOHIDDeviceInterface**) pDevice->interface)->queryElementValue (pDevice->interface, pElement->cookie, &hidEvent,0,NULL,NULL,NULL);
				if (kIOReturnUnsupported == result)	// unless it's unsuported.
					goto try_getElementValue;
				else if (kIOReturnSuccess != result)
					HIDREPORTERRORNUM ("HIDGetElementValue - Could not get HID element value via queryElementValue.", result);
			}
			else if (pElement->type <= kIOHIDElementTypeInput_ScanCodes)
			{
try_getElementValue:
				result = (*(IOHIDDeviceInterface**) pDevice->interface)->getElementValue (pDevice->interface, pElement->cookie, &hidEvent);
				if (kIOReturnSuccess != result)
					HIDREPORTERRORNUM ("HIDGetElementValue - Could not get HID element value via getElementValue.", result);
			}
			// on 10.0.x this returns the incorrect result for negative ranges, so fix it!!!
   // this is not required on Mac OS X 10.1+
			if ((pElement->min < 0) && (hidEvent.value > pElement->max)) // assume range problem
				hidEvent.value = hidEvent.value + pElement->min - pElement->max - 1;
		}
		else
			HIDREPORTERROR ("HIDGetElementValue - no interface for device.");
	}
	else
		HIDREPORTERROR ("HIDGetElementValue - invalid device and/or element.");

    // record min and max for auto scale and auto ...
    if (hidEvent.value < pElement->calMin)
        pElement->calMin = hidEvent.value; 
    if (hidEvent.value > pElement->calMax)
        pElement->calMax = hidEvent.value; 

    // auto user scale
    return hidEvent.value;
}

// ---------------------------------
// Set an elements value
// NOTE: This should only be used when a single element of a report needs to be sent.
// If multiple elements are to be send then transactions should be used.

long HIDSetElementValue (pRecDevice pDevice, pRecElement pElement,void* pIOHIDEvent)
{
	IOHIDEventStruct* pMyIOHIDEvent = (IOHIDEventStruct*) pIOHIDEvent;
    IOReturn result = kIOReturnError;	// assume failure (pessimist!)

	if (HIDIsValidElement(pDevice, pElement))
	{
		if (NULL != pDevice->interface)
		{
			result = (*(IOHIDDeviceInterface**) pDevice->interface)->setElementValue (pDevice->interface, pElement->cookie, pMyIOHIDEvent, -1, nil, nil, nil);
			if (kIOReturnSuccess != result)
				HIDREPORTERRORNUM ("HIDSetElementValue - Could not set HID element value via setElementValue.", result);
		}
		else
			HIDREPORTERROR ("HIDSetElementValue - no interface for device.");
	}
	else
		HIDREPORTERROR ("HIDSetElementValue - invalid device and/or element.");
	
    return result;
}

// ---------------------------------
// Set a callback to be called when a queue goes from empty to non-empty
long HIDSetQueueCallback (pRecDevice pDevice, IOHIDCallbackFunction callback)
{
    IOReturn result = kIOReturnError;	// assume failure (pessimist!)

	if (HIDIsValidDevice(pDevice))
	{
#if USE_ASYNC_EVENTS
		// if we don't have a queue runloop sourceÉ
		if (NULL == pDevice->queueRunLoopSource)
		{
			// then create one
			result = (*(IOHIDQueueInterface**) pDevice->queue)->createAsyncEventSource((void *) pDevice->queue,
				(CFRunLoopSourceRef*) &pDevice->queueRunLoopSource);
			if (kIOReturnSuccess != result)
				HIDREPORTERRORNUM ("HIDSetQueueCallback - Failed to createAsyncEventSource error: ", result);
		}
		// if we have one nowÉ
		if (NULL != pDevice->queueRunLoopSource)
		{
			// and it's not already attached to our runloopÉ
			if (!CFRunLoopContainsSource(CFRunLoopGetCurrent(), pDevice->queueRunLoopSource, kCFRunLoopDefaultMode))
				// then attach it now.
				CFRunLoopAddSource(CFRunLoopGetCurrent(), pDevice->queueRunLoopSource, kCFRunLoopDefaultMode);
		}

		// now install our callback
		result = (*(IOHIDQueueInterface**) pDevice->queue)->setEventCallout(pDevice->queue, callback, pDevice, pDevice);
		if (kIOReturnSuccess != result)
			HIDREPORTERRORNUM ("HIDSetQueueCallback - Could not set HID queue callback via setEventCallout.", result);
#endif USE_ASYNC_EVENTS
	}
	else
		HIDREPORTERROR ("HIDSetQueueCallback - invalid device and/or element.");
    return result;
}

#if 1
// ---------------------------------
// Get a report from a device
long HIDGetReport (pRecDevice pDevice,const IOHIDReportType reportType, const UInt32 reportID, void* reportBuffer, UInt32* reportBufferSize)
{
    IOReturn result = kIOReturnError;	// assume failure (pessimist!)

    if (HIDIsValidDevice(pDevice))
    {
		if (NULL != pDevice->interface)
		{
			result = (*(IOHIDDeviceInterface**) pDevice->interface)->getReport (pDevice->interface, reportType, reportID, reportBuffer, reportBufferSize, -1, nil, nil, nil);
			if (kIOReturnSuccess != result)
				HIDREPORTERRORNUM ("HIDGetReport - Could not getReport, error: ", result);
		}
		else
			HIDREPORTERROR ("HIDGetReport - no interface for device.");
    }
    else
        HIDREPORTERROR ("HIDGetReport - invalid device.");

    return result;
}

// ---------------------------------
// Send a report to a device
long HIDSetReport (pRecDevice pDevice,const IOHIDReportType reportType, const UInt32 reportID, void* reportBuffer, const UInt32 reportBufferSize)
{
    IOReturn result = kIOReturnError;	// assume failure (pessimist!)

    if (HIDIsValidDevice(pDevice))
    {
		if (NULL != pDevice->interface)
		{
			result = (*(IOHIDDeviceInterface**) pDevice->interface)->setReport (pDevice->interface, reportType, reportID, reportBuffer, reportBufferSize, -1, nil, nil, nil);
			if (kIOReturnSuccess != result)
				HIDREPORTERRORNUM ("HIDGetReport - Could not setReport; error: ", result);
		}
		else
			HIDREPORTERROR ("HIDGetReport - no interface for device.");
    }
    else
        HIDREPORTERROR ("HIDGetReport - invalid device.");

    return result;
}
#endif