Sample Code

OSX Driver and Kext Samples/ HID_Utilities/ HID_Utilities/ IOHIDManager/ IOHIDElement_.c/ 

//	    File: IOHIDElement_.c
//	Abstract: convieance functions for IOHIDElementGetProperty
//	 Version: 2.0
//	
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//	works in which the Apple 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) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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//	STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
//	POSSIBILITY OF SUCH DAMAGE.
//	
//	Copyright (C) 2009 Apple Inc. All Rights Reserved.
//	
//*****************************************************
#pragma mark - includes & imports
//-----------------------------------------------------

#include "IOHIDElement_.h"

//*****************************************************
#pragma mark - typedef's, struct's, enums, defines, etc.
//-----------------------------------------------------

//*****************************************************
#pragma mark - local (static) function prototypes
//-----------------------------------------------------

// static Boolean IOHIDElement_GetLongProperty( IOHIDElementRef inElementRef, CFStringRef inKey, long * outValue );
// static void IOHIDElement_SetLongProperty( IOHIDElementRef inElementRef, CFStringRef inKey, long inValue );

//*****************************************************
#pragma mark - exported globals
//-----------------------------------------------------

//*****************************************************
#pragma mark - local (static) globals
//-----------------------------------------------------

//*****************************************************
#pragma mark - exported function implementations
//-----------------------------------------------------

//*************************************************************************
//
// HIDIsValidElement( inIOHIDElementRef )
//
// Purpose:	validate this element
//
// Inputs:	inIOHIDElementRef	- the element
//
// Returns:	Boolean			- TRUE if this is a valid element ref
//
Boolean HIDIsValidElement(IOHIDElementRef inIOHIDElementRef) {
	Boolean result = FALSE; // assume failure (pessimist!)
	if ( inIOHIDElementRef ) {
		if (                                   CFGetTypeID(inIOHIDElementRef) ==IOHIDElementGetTypeID() ) {
			result = TRUE;
		}
	}
	
	return (result);
} // HIDIsValidElement

//*************************************************************************
//
// IOHIDElement_GetValue( inElementRef, inIOHIDValueScaleType )
//
// Purpose:	returns the current value for an element( polling )
//
// Notes:	will return 0 on error conditions which should be accounted for by application
//
// Inputs:	inElementRef	- the element
//			inIOHIDValueScaleType	- scale type ( calibrated or physical )
//
// Returns:	double		- current value for element
//
double IOHIDElement_GetValue(IOHIDElementRef inElementRef, IOHIDValueScaleType inIOHIDValueScaleType) {
	long result = 0;
	IOHIDValueRef tIOHIDValueRef;
	if ( kIOReturnSuccess == IOHIDDeviceGetValue(IOHIDElementGetDevice(inElementRef), inElementRef, &tIOHIDValueRef) ) {
		result = IOHIDValueGetScaledValue(tIOHIDValueRef, inIOHIDValueScaleType);
	}
	
	return (result);
}   // IOHIDElement_GetValue

//*************************************************************************
//
// IOHIDElement_GetCalibrationMin( inElementRef )
//
// Purpose:	get the minimum bounds for a calibrated value for this element
//
// Inputs:  inElementRef - the IOHIDElementRef for this element
//
// Returns:	CFIndex - the minimum Calibration value for this element
//

CFIndex IOHIDElement_GetCalibrationMin(IOHIDElementRef inElementRef) {
	CFIndex result;
	if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationMinKey), &result) ) {
		if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementMaxKey), &result) ) {
			result = 0x7FFFFFFF;
		}
		
		IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationMinKey), result);
	}
	
	return (result);
}   // IOHIDElement_GetCalibrationMin

//*************************************************************************
//
// IOHIDElement_SetCalibrationMin( inElementRef, inValue )
//
// Purpose:	set the minimum bounds for a calibrated value for this element
//
// Inputs:  inElementRef	- the IOHIDElementRef for this element
//			inValue			- the minimum bounds for a calibrated value for this element
//
// Returns:	nothing
//

void IOHIDElement_SetCalibrationMin(IOHIDElementRef inElementRef, CFIndex inValue) {
	IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationMinKey), inValue);
}   // IOHIDElement_SetCalibrationMin

//*************************************************************************
//
// IOHIDElement_GetCalibrationMax( inElementRef )
//
// Purpose:	get the maximum bounds for a calibrated value for this element
//
// Inputs:  inElementRef - the IOHIDElementRef for this element
//
// Returns:	CFIndex - the maximum Calibration value for this element
//

CFIndex IOHIDElement_GetCalibrationMax(IOHIDElementRef inElementRef) {
	CFIndex result;
	if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationMaxKey), &result) ) {
		if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementMinKey), &result) ) {
			result = -0x7FFFFFFF;
		}
		
		IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationMaxKey), result);
	}
	
	return (result);
}   // IOHIDElement_GetCalibrationMax

//*************************************************************************
//
// IOHIDElement_SetCalibrationMax( inElementRef, inValue )
//
// Purpose:	set the maximum bounds for a calibrated value for this element
//
// Inputs:  inElementRef	- the IOHIDElementRef for this element
//			inValue			- the maximum Calibration value for this element
//
// Returns:	nothing
//

void IOHIDElement_SetCalibrationMax(IOHIDElementRef inElementRef, CFIndex inValue) {
	IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationMaxKey), inValue);
}   // IOHIDElement_SetCalibrationMax

//*************************************************************************
//
// IOHIDElement_GetCalibrationSaturationMin( inElementRef )
//
// Purpose:	get the mininum tolerance to be used when calibrating a logical element value
//
// Inputs:  inElementRef - the IOHIDElementRef for this element
//
// Returns:	CFIndex - the maximum Calibration value for this element
//

CFIndex IOHIDElement_GetCalibrationSaturationMin(IOHIDElementRef inElementRef) {
	CFIndex result;
	if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationSaturationMinKey), &result) ) {
		if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementMinKey), &result) ) {
			result = -0x7FFFFFFF;
		}
		
		IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationSaturationMinKey), result);
	}
	
	return (result);
}   // IOHIDElement_GetCalibrationSaturationMin

//*************************************************************************
//
// IOHIDElement_SetCalibrationSaturationMin( inElementRef, inValue )
//
// Purpose:	set the mininum tolerance to be used when calibrating a logical element value
//
// Inputs:  inElementRef	- the IOHIDElementRef for this element
//			inValue			- the maximum Calibration value for this element
//
// Returns:	nothing
//

void IOHIDElement_SetCalibrationSaturationMin(IOHIDElementRef inElementRef, CFIndex inValue) {
	IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationSaturationMinKey), inValue);
}   // IOHIDElement_SetCalibrationSaturationMin

//*************************************************************************
//
// IOHIDElement_GetCalibrationSaturationMax( inElementRef )
//
// Purpose:	get the maximum tolerance to be used when calibrating a logical element value
//
// Inputs:  inElementRef - the IOHIDElementRef for this element
//
// Returns:	CFIndex - the maximum Calibration value for this element
//

CFIndex IOHIDElement_GetCalibrationSaturationMax(IOHIDElementRef inElementRef) {
	CFIndex result;
	if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationSaturationMaxKey), &result) ) {
		if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementMinKey), &result) ) {
			result = -0x7FFFFFFF;
		}
		
		IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationSaturationMaxKey), result);
	}
	
	return (result);
}   // IOHIDElement_GetCalibrationSaturationMax

//*************************************************************************
//
// IOHIDElement_SetCalibrationSaturationMax( inElementRef, inValue )
//
// Purpose:	set the maximum tolerance to be used when calibrating a logical element value
//
// Inputs:  inElementRef	- the IOHIDElementRef for this element
//			inValue			- the maximum Calibration value for this element
//
// Returns:	nothing
//

void IOHIDElement_SetCalibrationSaturationMax(IOHIDElementRef inElementRef, CFIndex inValue) {
	IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationSaturationMaxKey), inValue);
}   // IOHIDElement_SetCalibrationSaturationMax

//*************************************************************************
//
// IOHIDElement_GetCalibrationDeadZoneMin( inElementRef )
//
// Purpose:	get the minimum bounds near the midpoint of a logical value in which the value is ignored
//
// Inputs:  inElementRef - the IOHIDElementRef for this element
//
// Returns:	CFIndex - the maximum Calibration value for this element
//

CFIndex IOHIDElement_GetCalibrationDeadZoneMin(IOHIDElementRef inElementRef) {
	CFIndex result;
	if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMinKey), &result) ) {
		if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementMinKey), &result) ) {
			result = -0x7FFFFFFF;
		}
		
		IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMinKey), result);
	}
	
	return (result);
}   // IOHIDElement_GetCalibrationDeadZoneMin

//*************************************************************************
//
// IOHIDElement_SetCalibrationDeadZoneMin( inElementRef, inValue )
//
// Purpose:	set the minimum bounds near the midpoint of a logical value in which the value is ignored
//
// Inputs:  inElementRef	- the IOHIDElementRef for this element
//			inValue			- the maximum Calibration value for this element
//
// Returns:	nothing
//

void IOHIDElement_SetCalibrationDeadZoneMin(IOHIDElementRef inElementRef, CFIndex inValue) {
	IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMinKey), inValue);
}   // IOHIDElement_SetCalibrationDeadZoneMin

//*************************************************************************
//
// IOHIDElement_GetCalibrationDeadZoneMax( inElementRef )
//
// Purpose:	get the maximum bounds near the midpoint of a logical value in which the value is ignored
//
// Inputs:  inElementRef - the IOHIDElementRef for this element
//
// Returns:	CFIndex - the maximum Calibration value for this element
//

CFIndex IOHIDElement_GetCalibrationDeadZoneMax(IOHIDElementRef inElementRef) {
	CFIndex result;
	if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMaxKey), &result) ) {
		if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementMinKey), &result) ) {
			result = -0x7FFFFFFF;
		}
		
		IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMaxKey), result);
	}
	
	return (result);
}   // IOHIDElement_GetCalibrationDeadZoneMax

//*************************************************************************
//
// IOHIDElement_SetCalibrationDeadZoneMax( inElementRef, inValue )
//
// Purpose:	set the maximum bounds near the midpoint of a logical value in which the value is ignored
//
// Inputs:  inElementRef	- the IOHIDElementRef for this element
//			inValue			- the maximum Calibration value for this element
//
// Returns:	nothing
//

void IOHIDElement_SetCalibrationDeadZoneMax(IOHIDElementRef inElementRef, CFIndex inValue) {
	IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMaxKey), inValue);
}   // IOHIDElement_SetCalibrationDeadZoneMax

//*************************************************************************
//
// IOHIDElement_GetCalibrationGranularity( inElementRef )
//
// Purpose:	get the level of detail returned for a calibrated element value
//
// Inputs:  inElementRef - the IOHIDElementRef for this element
//
// Returns:	double_t - the maximum Calibration value for this element
//

double_t IOHIDElement_GetCalibrationGranularity(IOHIDElementRef inElementRef) {
	CFIndex result;
	if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationGranularityKey), &result) ) {
		if ( !IOHIDElement_GetLongProperty(inElementRef, CFSTR(kIOHIDElementMinKey), &result) ) {
			result = -0x7FFFFFFF;
		}
		
		IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationGranularityKey), result);
	}
	
	return (result);
}   // IOHIDElement_GetCalibrationGranularity

//*************************************************************************
//
// IOHIDElement_SetCalibrationGranularity( inElementRef, inValue )
//
// Purpose:	set the level of detail returned for a calibrated element value
//
// Inputs:  inElementRef	- the IOHIDElementRef for this element
//			inValue			- the the level of detail for this element
//
// Returns:	nothing
//

void IOHIDElement_SetCalibrationGranularity(IOHIDElementRef inElementRef, double_t inValue) {
	IOHIDElement_SetLongProperty(inElementRef, CFSTR(kIOHIDElementCalibrationGranularityKey), inValue);
}   // IOHIDElement_SetCalibrationGranularity

//*************************************************************************
//
// IOHIDElement_SetupCalibration( inElementRef )
//
// Purpose:	set default values for the element calibration parameters
//
// Inputs:  inElementRef	- the IOHIDElementRef for this element
//
// Returns:	nothing
//
void IOHIDElement_SetupCalibration(IOHIDElementRef inIOHIDElementRef) {
	// these are the min/max values returned by IOHIDValueGetScaledValue( v, kIOHIDValueScaleTypeCalibrated );
	IOHIDElement_SetCalibrationMin( inIOHIDElementRef, IOHIDElementGetLogicalMin(inIOHIDElementRef) );
	IOHIDElement_SetCalibrationMax( inIOHIDElementRef, IOHIDElementGetLogicalMax(inIOHIDElementRef) );
	
	// this is the granularity of the values returned by IOHIDValueGetScaledValue( v, kIOHIDValueScaleTypeCalibrated );
	// for example if set to 0.1 the values returned will be multiples of 0.1 ( 0.1, 0.2, 0.3, etc. )
	IOHIDElement_SetCalibrationGranularity(inIOHIDElementRef, 0.);
	
	// these define the dead zone (like in the middel of joystick axis)
	IOHIDElement_SetCalibrationDeadZoneMin(inIOHIDElementRef, 0);
	IOHIDElement_SetCalibrationDeadZoneMax(inIOHIDElementRef, 0);
#if 1
	// get the current value of this element
	double value = IOHIDElement_GetValue(inIOHIDElementRef, kIOHIDValueScaleTypePhysical);
	// use it as our min/mas saturation
	IOHIDElement_SetCalibrationSaturationMin(inIOHIDElementRef, value);
	IOHIDElement_SetCalibrationSaturationMax(inIOHIDElementRef, value);
#else
	// calculate the middle physical value we would expect from this element
	CFIndex valueMin = IOHIDElementGetPhysicalMin(inIOHIDElementRef);
	CFIndex valueMax = IOHIDElementGetPhysicalMax(inIOHIDElementRef);
	CFIndex valueMid = (valueMin + valueMax) / 2;
	
	// use it as our min/mas saturation
	// this value determines the min/max values that have been recieved from the device element
	IOHIDElement_SetCalibrationSaturationMin(inIOHIDElementRef, valueMid);
	IOHIDElement_SetCalibrationSaturationMax(inIOHIDElementRef, valueMid);
	
	// get the current value of this element
	double value = IOHIDElement_GetValue(inIOHIDElementRef, kIOHIDValueScaleTypePhysical);
	// and use it to adjust the current saturation values if it's outside their range
	if ( value < IOHIDElement_GetCalibrationSaturationMin(inIOHIDElementRef) ) {
		IOHIDElement_SetCalibrationSaturationMin(inIOHIDElementRef, value);
	}
	if ( value > IOHIDElement_GetCalibrationSaturationMax(inIOHIDElementRef) ) {
		IOHIDElement_SetCalibrationSaturationMax(inIOHIDElementRef, value);
	}
	
#endif
}   // IOHIDElement_SetupCalibration
//*****************************************************
#pragma mark - local (static) function implementations
//-----------------------------------------------------

//*************************************************************************
//
// IOHIDElement_GetLongProperty( inElementRef, inKey, outValue )
//
// Purpose:	convieance function to return a long property of an element
//
// Inputs:	inElementRef	- the element
//			inKey			- CFString for the key
//			outValue		- address where to store the value
// Returns:	Boolean			- TRUE if successful
//			outValue		- the long property's value
//

Boolean IOHIDElement_GetLongProperty(IOHIDElementRef inElementRef, CFStringRef inKey, long *outValue) {
	Boolean result = FALSE;
	
	CFTypeRef tCFTypeRef = IOHIDElementGetProperty(inElementRef, inKey);
	if ( tCFTypeRef ) {
		// if this is a number
		if ( CFNumberGetTypeID() == CFGetTypeID(tCFTypeRef) ) {
			// get it's value
			result = CFNumberGetValue( (CFNumberRef) tCFTypeRef, kCFNumberSInt32Type, outValue );
		}
	}
	
	return (result);
} /* IOHIDElement_GetLongProperty */

//*************************************************************************
//
// IOHIDElement_SetLongProperty( inElementRef, inKey, inValue )
//
// Purpose:	convieance function to set a long property of an element
//
// Inputs:	inElementRef	- the element
//			inKey			- CFString for the key
//			inValue			- the value to set it to
//
// Returns:	nothing
//

void IOHIDElement_SetLongProperty(IOHIDElementRef inElementRef, CFStringRef inKey, long inValue) {
	CFNumberRef tCFNumberRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &inValue);
	if ( tCFNumberRef ) {
		IOHIDElementSetProperty(inElementRef, inKey, tCFNumberRef);
		CFRelease(tCFNumberRef);
	}
} // IOHIDElement_SetLongProperty

//*****************************************************

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