HID Utilities/IOHIDManager/IOHIDElement_.c
// File: IOHIDElement_.c |
// Abstract: convieance functions for IOHIDElementGetProperty |
// Version: 5.3 |
// |
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// Copyright (C) 2014 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 |
// ----------------------------------------------------- |
// ***************************************************** |
#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(inIOHIDElementRef, 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: inIOHIDElementRef - the element |
// inIOHIDValueScaleType - scale type (calibrated or physical) |
// |
// Returns: double - current value for element |
// |
double IOHIDElement_GetValue(IOHIDElementRef inIOHIDElementRef, |
IOHIDValueScaleType inIOHIDValueScaleType) { |
double result = NAN; |
IOHIDValueRef tIOHIDValueRef; |
if (kIOReturnSuccess == IOHIDDeviceGetValue(IOHIDElementGetDevice(inIOHIDElementRef), inIOHIDElementRef, &tIOHIDValueRef)) { |
result = IOHIDValueGetScaledValue(tIOHIDValueRef, inIOHIDValueScaleType); |
} |
return (result); |
} // IOHIDElement_GetValue |
// ************************************************************************* |
// |
// IOHIDElement_GetCalibrationMin(inIOHIDElementRef) |
// |
// Purpose: get the minimum bounds for a calibrated value for this element |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// |
// Returns: double - the minimum Calibration value for this element |
// |
double IOHIDElement_GetCalibrationMin(IOHIDElementRef inIOHIDElementRef) { |
double result = NAN; |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationMinKey), &result)) { |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementMaxKey), &result)) { |
result = NAN; |
} else { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationMinKey), result); |
} |
} |
return (result); |
} // IOHIDElement_GetCalibrationMin |
// ************************************************************************* |
// |
// IOHIDElement_SetCalibrationMin(inIOHIDElementRef, inValue) |
// |
// Purpose: set the minimum bounds for a calibrated value for this element |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// inValue - the minimum bounds for a calibrated value for this element |
// |
// Returns: nothing |
// |
void IOHIDElement_SetCalibrationMin(IOHIDElementRef inIOHIDElementRef, double inValue) { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationMinKey), inValue); |
} // IOHIDElement_SetCalibrationMin |
// ************************************************************************* |
// |
// IOHIDElement_GetCalibrationMax(inIOHIDElementRef) |
// |
// Purpose: get the maximum bounds for a calibrated value for this element |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// |
// Returns: double - the maximum Calibration value for this element |
// |
double IOHIDElement_GetCalibrationMax(IOHIDElementRef inIOHIDElementRef) { |
double result = NAN; |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationMaxKey), &result)) { |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementMinKey), &result)) { |
result = NAN; |
} else { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationMaxKey), result); |
} |
} |
return (result); |
} // IOHIDElement_GetCalibrationMax |
// ************************************************************************* |
// |
// IOHIDElement_SetCalibrationMax(inIOHIDElementRef, inValue) |
// |
// Purpose: set the maximum bounds for a calibrated value for this element |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// inValue - the maximum Calibration value for this element |
// |
// Returns: nothing |
// |
void IOHIDElement_SetCalibrationMax(IOHIDElementRef inIOHIDElementRef, double inValue) { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationMaxKey), inValue); |
} // IOHIDElement_SetCalibrationMax |
// ************************************************************************* |
// |
// IOHIDElement_GetCalibrationSaturationMin(inIOHIDElementRef) |
// |
// Purpose: get the mininum tolerance to be used when calibrating a logical element value |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// |
// Returns: double - the maximum Calibration value for this element |
// |
double IOHIDElement_GetCalibrationSaturationMin(IOHIDElementRef inIOHIDElementRef) { |
double result = NAN; |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationSaturationMinKey), &result)) { |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementMinKey), &result)) { |
result = NAN; |
} else { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationSaturationMinKey), result); |
} |
} |
return (result); |
} // IOHIDElement_GetCalibrationSaturationMin |
// ************************************************************************* |
// |
// IOHIDElement_SetCalibrationSaturationMin(inIOHIDElementRef, inValue) |
// |
// Purpose: set the mininum tolerance to be used when calibrating a logical element value |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// inValue - the maximum Calibration value for this element |
// |
// Returns: nothing |
// |
void IOHIDElement_SetCalibrationSaturationMin(IOHIDElementRef inIOHIDElementRef, double inValue) { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationSaturationMinKey), inValue); |
} // IOHIDElement_SetCalibrationSaturationMin |
// ************************************************************************* |
// |
// IOHIDElement_GetCalibrationSaturationMax(inIOHIDElementRef) |
// |
// Purpose: get the maximum tolerance to be used when calibrating a logical element value |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// |
// Returns: double - the maximum Calibration value for this element |
// |
double IOHIDElement_GetCalibrationSaturationMax(IOHIDElementRef inIOHIDElementRef) { |
double result = NAN; |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationSaturationMaxKey), &result)) { |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementMinKey), &result)) { |
result = NAN; |
} else { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationSaturationMaxKey), result); |
} |
} |
return (result); |
} // IOHIDElement_GetCalibrationSaturationMax |
// ************************************************************************* |
// |
// IOHIDElement_SetCalibrationSaturationMax(inIOHIDElementRef, inValue) |
// |
// Purpose: set the maximum tolerance to be used when calibrating a logical element value |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// inValue - the maximum Calibration value for this element |
// |
// Returns: nothing |
// |
void IOHIDElement_SetCalibrationSaturationMax(IOHIDElementRef inIOHIDElementRef, double inValue) { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationSaturationMaxKey), inValue); |
} // IOHIDElement_SetCalibrationSaturationMax |
// ************************************************************************* |
// |
// IOHIDElement_GetCalibrationDeadZoneMin(inIOHIDElementRef) |
// |
// Purpose: get the minimum bounds near the midpoint of a logical value in which the value is ignored |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// |
// Returns: double - the maximum Calibration value for this element |
// |
double IOHIDElement_GetCalibrationDeadZoneMin(IOHIDElementRef inIOHIDElementRef) { |
double result = NAN; |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMinKey), &result)) { |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementMinKey), &result)) { |
result = NAN; |
} else { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMinKey), result); |
} |
} |
return (result); |
} // IOHIDElement_GetCalibrationDeadZoneMin |
// ************************************************************************* |
// |
// IOHIDElement_SetCalibrationDeadZoneMin(inIOHIDElementRef, inValue) |
// |
// Purpose: set the minimum bounds near the midpoint of a logical value in which the value is ignored |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// inValue - the maximum Calibration value for this element |
// |
// Returns: nothing |
// |
void IOHIDElement_SetCalibrationDeadZoneMin(IOHIDElementRef inIOHIDElementRef, double inValue) { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMinKey), inValue); |
} // IOHIDElement_SetCalibrationDeadZoneMin |
// ************************************************************************* |
// |
// IOHIDElement_GetCalibrationDeadZoneMax(inIOHIDElementRef) |
// |
// Purpose: get the maximum bounds near the midpoint of a logical value in which the value is ignored |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// |
// Returns: double - the maximum Calibration value for this element |
// |
double IOHIDElement_GetCalibrationDeadZoneMax(IOHIDElementRef inIOHIDElementRef) { |
double result = NAN; |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMaxKey), &result)) { |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementMinKey), &result)) { |
result = NAN; |
} else { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMaxKey), result); |
} |
} |
return (result); |
} // IOHIDElement_GetCalibrationDeadZoneMax |
// ************************************************************************* |
// |
// IOHIDElement_SetCalibrationDeadZoneMax(inIOHIDElementRef, inValue) |
// |
// Purpose: set the maximum bounds near the midpoint of a logical value in which the value is ignored |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// inValue - the maximum Calibration value for this element |
// |
// Returns: nothing |
// |
void IOHIDElement_SetCalibrationDeadZoneMax(IOHIDElementRef inIOHIDElementRef, double inValue) { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationDeadZoneMaxKey), inValue); |
} // IOHIDElement_SetCalibrationDeadZoneMax |
// ************************************************************************* |
// |
// IOHIDElement_GetCalibrationGranularity(inIOHIDElementRef) |
// |
// Purpose: get the level of detail returned for a calibrated element value |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// |
// Returns: double_t - the maximum Calibration value for this element |
// |
double_t IOHIDElement_GetCalibrationGranularity(IOHIDElementRef inIOHIDElementRef) { |
double result = NAN; |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationGranularityKey), &result)) { |
if (!IOHIDElement_GetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementMinKey), &result)) { |
result = NAN; |
} else { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationGranularityKey), result); |
} |
} |
return (result); |
} // IOHIDElement_GetCalibrationGranularity |
// ************************************************************************* |
// |
// IOHIDElement_SetCalibrationGranularity(inIOHIDElementRef, inValue) |
// |
// Purpose: set the level of detail returned for a calibrated element value |
// |
// Inputs: inIOHIDElementRef - the IOHIDElementRef for this element |
// inValue - the the level of detail for this element |
// |
// Returns: nothing |
// |
void IOHIDElement_SetCalibrationGranularity(IOHIDElementRef inIOHIDElementRef, double_t inValue) { |
IOHIDElement_SetDoubleProperty(inIOHIDElementRef, CFSTR(kIOHIDElementCalibrationGranularityKey), inValue); |
} // IOHIDElement_SetCalibrationGranularity |
// ************************************************************************* |
// |
// IOHIDElement_SetupCalibration(inIOHIDElementRef) |
// |
// Purpose: set default values for the element calibration parameters |
// |
// Inputs: inIOHIDElementRef - 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)); |
CFIndex phyMin = IOHIDElementGetPhysicalMin(inIOHIDElementRef); |
CFIndex phyMax = IOHIDElementGetPhysicalMax(inIOHIDElementRef); |
CFIndex phyRange = phyMax - phyMin; |
// calculate the middle physical value we would expect from this element |
double phyMid = (phyMin + phyMax) / 2.f; |
// 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.); |
Boolean isRelative = IOHIDElementIsRelative(inIOHIDElementRef); |
Boolean hasPreferredState = IOHIDElementHasPreferredState(inIOHIDElementRef); |
// define the dead zone (like in the middle of joystick axis) |
if (!isRelative && hasPreferredState && (phyRange > 3)) { |
IOHIDElement_SetCalibrationDeadZoneMin(inIOHIDElementRef, phyMid - 1.0); |
IOHIDElement_SetCalibrationDeadZoneMax(inIOHIDElementRef, phyMid + 1.0); |
} else { |
IOHIDElement_SetCalibrationDeadZoneMin(inIOHIDElementRef, 0.); |
IOHIDElement_SetCalibrationDeadZoneMax(inIOHIDElementRef, 0.); |
} |
// get the current value of this element |
double phyValue = IOHIDElement_GetValue(inIOHIDElementRef, kIOHIDValueScaleTypePhysical); |
#if true |
// use that that value to determine the min/max saturation values used for calibration |
IOHIDElement_SetCalibrationSaturationMin(inIOHIDElementRef, phyValue); |
IOHIDElement_SetCalibrationSaturationMax(inIOHIDElementRef, phyValue); |
#else // if 1 |
#if true |
// this value determines the min/max values that have been recieved from the device element |
IOHIDElement_SetCalibrationSaturationMin(inIOHIDElementRef, (phyMin + phyMid) / 2.f); |
IOHIDElement_SetCalibrationSaturationMax(inIOHIDElementRef, (phyMid + phyMax) / 2.f); |
#else // if 1 |
// use it as our min/max saturation |
// this value determines the min/max values that have been recieved from the device element |
IOHIDElement_SetCalibrationSaturationMin(inIOHIDElementRef, phyMid); |
IOHIDElement_SetCalibrationSaturationMax(inIOHIDElementRef, phyMid); |
#endif // if 1 |
// and the current value to adjust the current saturation values if it's outside their range |
if (phyValue < IOHIDElement_GetCalibrationSaturationMin(inIOHIDElementRef)) { |
IOHIDElement_SetCalibrationSaturationMin(inIOHIDElementRef, phyValue); |
} |
if (phyValue > IOHIDElement_GetCalibrationSaturationMax(inIOHIDElementRef)) { |
IOHIDElement_SetCalibrationSaturationMax(inIOHIDElementRef, phyValue); |
} |
#endif // if 1 |
} // IOHIDElement_SetupCalibration |
// ***************************************************** |
#pragma mark - local (static) function implementations |
// ----------------------------------------------------- |
// ************************************************************************* |
// |
// IOHIDElement_GetUInt32Property(inIOHIDElementRef, inKey, outValue) |
// |
// Purpose: convieance function to return a long property of an element |
// |
// Inputs: inIOHIDElementRef - 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_GetUInt32Property(IOHIDElementRef inIOHIDElementRef, CFStringRef inKey, uint32_t *outValue) { |
Boolean result = false; |
CFTypeRef tCFTypeRef = IOHIDElementGetProperty(inIOHIDElementRef, 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_GetUInt32Property */ |
// ************************************************************************* |
// |
// IOHIDElement_SetUInt32Property(inIOHIDElementRef, inKey, inValue) |
// |
// Purpose: convieance function to set a long property of an element |
// |
// Inputs: inIOHIDElementRef - the element |
// inKey - CFString for the key |
// inValue - the value to set it to |
// |
// Returns: nothing |
// |
void IOHIDElement_SetUInt32Property(IOHIDElementRef inIOHIDElementRef, CFStringRef inKey, uint32_t inValue) { |
CFNumberRef tCFNumberRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &inValue); |
if (tCFNumberRef) { |
IOHIDElementSetProperty(inIOHIDElementRef, inKey, tCFNumberRef); |
CFRelease(tCFNumberRef); |
} |
} // IOHIDElement_SetUInt32Property |
// ************************************************************************* |
// |
// IOHIDElement_GetDoubleProperty(inIOHIDElementRef, inKey, outValue) |
// |
// Purpose: convieance function to return a double property of an element |
// |
// Inputs: inIOHIDElementRef - the element |
// inKey - CFString for the key |
// outValue - address where to store the value |
// Returns: Boolean - true if successful |
// outValue - the double property's value |
// |
Boolean IOHIDElement_GetDoubleProperty(IOHIDElementRef inIOHIDElementRef, CFStringRef inKey, double *outValue) { |
Boolean result = false; |
CFTypeRef tCFTypeRef = IOHIDElementGetProperty(inIOHIDElementRef, inKey); |
if (tCFTypeRef) { |
// if this is a number |
if (CFNumberGetTypeID() == CFGetTypeID(tCFTypeRef)) { |
// get it's value |
result = CFNumberGetValue((CFNumberRef) tCFTypeRef, kCFNumberDoubleType, outValue); |
} |
} |
return (result); |
} /* IOHIDElement_GetDoubleProperty */ |
// ************************************************************************* |
// |
// IOHIDElement_SetDoubleProperty(inIOHIDElementRef, inKey, inValue) |
// |
// Purpose: convieance function to set a double property of an element |
// |
// Inputs: inIOHIDElementRef - the element |
// inKey - CFString for the key |
// inValue - the value to set it to |
// |
// Returns: nothing |
// |
void IOHIDElement_SetDoubleProperty(IOHIDElementRef inIOHIDElementRef, CFStringRef inKey, double inValue) { |
CFNumberRef tCFNumberRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberDoubleType, &inValue); |
if (tCFNumberRef) { |
IOHIDElementSetProperty(inIOHIDElementRef, inKey, tCFNumberRef); |
CFRelease(tCFNumberRef); |
} |
} // IOHIDElement_SetDoubleProperty |
// ***************************************************** |
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