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SDL_sysjoystick.c
837 lines (734 loc) · 29.8 KB
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2004 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#ifdef SDL_JOYSTICK_IOKIT
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/* SDL joystick driver for Darwin / Mac OS X, based on the IOKit HID API */
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/* Written 2001 by Max Horn */
#include <unistd.h>
#include <ctype.h>
#include <sysexits.h>
#include <mach/mach.h>
#include <mach/mach_error.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOCFPlugIn.h>
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#ifdef MACOS_10_0_4
#include <IOKit/hidsystem/IOHIDUsageTables.h>
#else
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/* The header was moved here in Mac OS X 10.1 */
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#include <Kernel/IOKit/hidsystem/IOHIDUsageTables.h>
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#endif
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#if MAC_OS_X_VERSION_MIN_REQUIRED == 1030
#include "10.3.9-FIX/IOHIDLib.h"
#else
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#include <IOKit/hid/IOHIDLib.h>
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#endif
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#include <IOKit/hid/IOHIDKeys.h>
#include <CoreFoundation/CoreFoundation.h>
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#include <Carbon/Carbon.h> /* for NewPtrClear, DisposePtr */
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#include "SDL_joystick.h"
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#include "../SDL_sysjoystick.h"
#include "../SDL_joystick_c.h"
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#include "SDL_sysjoystick_c.h"
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/* Linked list of all available devices */
static recDevice *gpDeviceList = NULL;
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static void
HIDReportErrorNum(char *strError, long numError)
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{
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SDL_SetError(strError);
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}
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static void HIDGetCollectionElements(CFMutableDictionaryRef deviceProperties,
recDevice * pDevice);
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/* returns current value for element, polling element
* will return 0 on error conditions which should be accounted for by application
*/
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static SInt32
HIDGetElementValue(recDevice * pDevice, recElement * pElement)
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{
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IOReturn result = kIOReturnSuccess;
IOHIDEventStruct hidEvent;
hidEvent.value = 0;
if (NULL != pDevice && NULL != pElement && NULL != pDevice->interface) {
result =
(*(pDevice->interface))->getElementValue(pDevice->interface,
pElement->cookie,
&hidEvent);
if (kIOReturnSuccess == result) {
/* record min and max for auto calibration */
if (hidEvent.value < pElement->minReport)
pElement->minReport = hidEvent.value;
if (hidEvent.value > pElement->maxReport)
pElement->maxReport = hidEvent.value;
}
}
/* auto user scale */
return hidEvent.value;
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}
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static SInt32
HIDScaledCalibratedValue(recDevice * pDevice, recElement * pElement,
long min, long max)
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{
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float deviceScale = max - min;
float readScale = pElement->maxReport - pElement->minReport;
SInt32 value = HIDGetElementValue(pDevice, pElement);
if (readScale == 0)
return value; /* no scaling at all */
else
return ((value - pElement->minReport) * deviceScale / readScale) +
min;
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}
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static void
HIDRemovalCallback(void *target, IOReturn result, void *refcon, void *sender)
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{
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recDevice *device = (recDevice *) refcon;
device->removed = 1;
device->uncentered = 1;
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}
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/* Create and open an interface to device, required prior to extracting values or building queues.
* Note: appliction now owns the device and must close and release it prior to exiting
*/
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static IOReturn
HIDCreateOpenDeviceInterface(io_object_t hidDevice, recDevice * pDevice)
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{
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IOReturn result = kIOReturnSuccess;
HRESULT plugInResult = S_OK;
SInt32 score = 0;
IOCFPlugInInterface **ppPlugInInterface = NULL;
if (NULL == pDevice->interface) {
result =
IOCreatePlugInInterfaceForService(hidDevice,
kIOHIDDeviceUserClientTypeID,
kIOCFPlugInInterfaceID,
&ppPlugInInterface, &score);
if (kIOReturnSuccess == result) {
/* Call a method of the intermediate plug-in to create the device interface */
plugInResult =
(*ppPlugInInterface)->QueryInterface(ppPlugInInterface,
CFUUIDGetUUIDBytes
(kIOHIDDeviceInterfaceID),
(void *) &(pDevice->
interface));
if (S_OK != plugInResult)
HIDReportErrorNum
("CouldnÕt query HID class device interface from plugInInterface",
plugInResult);
(*ppPlugInInterface)->Release(ppPlugInInterface);
} else
HIDReportErrorNum
("Failed to create **plugInInterface via IOCreatePlugInInterfaceForService.",
result);
}
if (NULL != pDevice->interface) {
result = (*(pDevice->interface))->open(pDevice->interface, 0);
if (kIOReturnSuccess != result)
HIDReportErrorNum
("Failed to open pDevice->interface via open.", result);
else
(*(pDevice->interface))->setRemovalCallback(pDevice->interface,
HIDRemovalCallback,
pDevice, pDevice);
}
return result;
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}
/* 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)
*/
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static IOReturn
HIDCloseReleaseInterface(recDevice * pDevice)
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{
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IOReturn result = kIOReturnSuccess;
if ((NULL != pDevice) && (NULL != pDevice->interface)) {
/* close the interface */
result = (*(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("Failed to close IOHIDDeviceInterface.",
result);
/* release the interface */
result = (*(pDevice->interface))->Release(pDevice->interface);
if (kIOReturnSuccess != result)
HIDReportErrorNum("Failed to release IOHIDDeviceInterface.",
result);
pDevice->interface = NULL;
}
return result;
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}
/* extracts actual specific element information from each element CF dictionary entry */
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static void
HIDGetElementInfo(CFTypeRef refElement, recElement * pElement)
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{
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long number;
CFTypeRef refType;
refType = CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementCookieKey));
if (refType && CFNumberGetValue(refType, kCFNumberLongType, &number))
pElement->cookie = (IOHIDElementCookie) number;
refType = CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementMinKey));
if (refType && CFNumberGetValue(refType, kCFNumberLongType, &number))
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pElement->minReport = pElement->min = number;
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pElement->maxReport = pElement->min;
refType = CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementMaxKey));
if (refType && CFNumberGetValue(refType, kCFNumberLongType, &number))
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pElement->maxReport = pElement->max = number;
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/*
TODO: maybe should handle the following stuff somehow?
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementScaledMinKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->scaledMin = number;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementScaledMaxKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->scaledMax = number;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementSizeKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->size = number;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsRelativeKey));
if (refType)
pElement->relative = CFBooleanGetValue (refType);
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsWrappingKey));
if (refType)
pElement->wrapping = CFBooleanGetValue (refType);
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsNonLinearKey));
if (refType)
pElement->nonLinear = CFBooleanGetValue (refType);
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementHasPreferedStateKey));
if (refType)
pElement->preferredState = CFBooleanGetValue (refType);
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementHasNullStateKey));
if (refType)
pElement->nullState = CFBooleanGetValue (refType);
*/
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}
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/* examines CF dictionary vlaue in device element hierarchy to determine if it is element of interest or a collection of more elements
* if element of interest allocate storage, add to list and retrieve element specific info
* if collection then pass on to deconstruction collection into additional individual elements
*/
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static void
HIDAddElement(CFTypeRef refElement, recDevice * pDevice)
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{
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recElement *element = NULL;
recElement **headElement = NULL;
long elementType, usagePage, usage;
CFTypeRef refElementType =
CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementTypeKey));
CFTypeRef refUsagePage =
CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementUsagePageKey));
CFTypeRef refUsage =
CFDictionaryGetValue(refElement, CFSTR(kIOHIDElementUsageKey));
if ((refElementType)
&&
(CFNumberGetValue(refElementType, kCFNumberLongType, &elementType))) {
/* look at types of interest */
if ((elementType == kIOHIDElementTypeInput_Misc)
|| (elementType == kIOHIDElementTypeInput_Button)
|| (elementType == kIOHIDElementTypeInput_Axis)) {
if (refUsagePage
&& CFNumberGetValue(refUsagePage, kCFNumberLongType,
&usagePage) && refUsage
&& CFNumberGetValue(refUsage, kCFNumberLongType, &usage)) {
switch (usagePage) { /* only interested in kHIDPage_GenericDesktop and kHIDPage_Button */
case kHIDPage_GenericDesktop:
{
switch (usage) { /* look at usage to determine function */
case kHIDUsage_GD_X:
case kHIDUsage_GD_Y:
case kHIDUsage_GD_Z:
case kHIDUsage_GD_Rx:
case kHIDUsage_GD_Ry:
case kHIDUsage_GD_Rz:
case kHIDUsage_GD_Slider:
case kHIDUsage_GD_Dial:
case kHIDUsage_GD_Wheel:
element = (recElement *)
NewPtrClear(sizeof(recElement));
if (element) {
pDevice->axes++;
headElement = &(pDevice->firstAxis);
}
break;
case kHIDUsage_GD_Hatswitch:
element = (recElement *)
NewPtrClear(sizeof(recElement));
if (element) {
pDevice->hats++;
headElement = &(pDevice->firstHat);
}
break;
}
}
break;
case kHIDPage_Button:
element = (recElement *)
NewPtrClear(sizeof(recElement));
if (element) {
pDevice->buttons++;
headElement = &(pDevice->firstButton);
}
break;
default:
break;
}
}
} else if (kIOHIDElementTypeCollection == elementType)
HIDGetCollectionElements((CFMutableDictionaryRef) refElement,
pDevice);
}
if (element && headElement) { /* add to list */
pDevice->elements++;
if (NULL == *headElement)
*headElement = element;
else {
recElement *elementPrevious, *elementCurrent;
elementCurrent = *headElement;
while (elementCurrent) {
elementPrevious = elementCurrent;
elementCurrent = elementPrevious->pNext;
}
elementPrevious->pNext = element;
}
element->pNext = NULL;
HIDGetElementInfo(refElement, element);
}
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}
/* collects information from each array member in device element list (each array memeber = element) */
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static void
HIDGetElementsCFArrayHandler(const void *value, void *parameter)
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{
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if (CFGetTypeID(value) == CFDictionaryGetTypeID())
HIDAddElement((CFTypeRef) value, (recDevice *) parameter);
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}
/* handles retrieval of element information from arrays of elements in device IO registry information */
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static void
HIDGetElements(CFTypeRef refElementCurrent, recDevice * pDevice)
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{
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CFTypeID type = CFGetTypeID(refElementCurrent);
if (type == CFArrayGetTypeID()) { /* if element is an array */
CFRange range = { 0, CFArrayGetCount(refElementCurrent) };
/* CountElementsCFArrayHandler called for each array member */
CFArrayApplyFunction(refElementCurrent, range,
HIDGetElementsCFArrayHandler, pDevice);
}
}
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/* handles extracting element information from element collection CF types
* used from top level element decoding and hierarchy deconstruction to flatten device element list
*/
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static void
HIDGetCollectionElements(CFMutableDictionaryRef deviceProperties,
recDevice * pDevice)
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{
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CFTypeRef refElementTop =
CFDictionaryGetValue(deviceProperties, CFSTR(kIOHIDElementKey));
if (refElementTop)
HIDGetElements(refElementTop, pDevice);
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}
/* use top level element usage page and usage to discern device usage page and usage setting appropriate vlaues in device record */
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static void
HIDTopLevelElementHandler(const void *value, void *parameter)
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{
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CFTypeRef refCF = 0;
if (CFGetTypeID(value) != CFDictionaryGetTypeID())
return;
refCF = CFDictionaryGetValue(value, CFSTR(kIOHIDElementUsagePageKey));
if (!CFNumberGetValue
(refCF, kCFNumberLongType, &((recDevice *) parameter)->usagePage))
SDL_SetError("CFNumberGetValue error retrieving pDevice->usagePage.");
refCF = CFDictionaryGetValue(value, CFSTR(kIOHIDElementUsageKey));
if (!CFNumberGetValue
(refCF, kCFNumberLongType, &((recDevice *) parameter)->usage))
SDL_SetError("CFNumberGetValue error retrieving pDevice->usage.");
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}
/* extracts device info from CF dictionary records in IO registry */
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static void
HIDGetDeviceInfo(io_object_t hidDevice, CFMutableDictionaryRef hidProperties,
recDevice * pDevice)
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{
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CFMutableDictionaryRef usbProperties = 0;
io_registry_entry_t parent1, parent2;
/* Mac OS X currently is not mirroring all USB properties to HID page so need to look at USB device page also
* get dictionary for usb properties: step up two levels and get CF dictionary for USB properties
*/
if ((KERN_SUCCESS ==
IORegistryEntryGetParentEntry(hidDevice, kIOServicePlane, &parent1))
&& (KERN_SUCCESS ==
IORegistryEntryGetParentEntry(parent1, kIOServicePlane, &parent2))
&& (KERN_SUCCESS ==
IORegistryEntryCreateCFProperties(parent2, &usbProperties,
kCFAllocatorDefault,
kNilOptions))) {
if (usbProperties) {
CFTypeRef refCF = 0;
/* get device info
* try hid dictionary first, if fail then go to usb dictionary
*/
/* get product name */
refCF =
CFDictionaryGetValue(hidProperties, CFSTR(kIOHIDProductKey));
if (!refCF)
refCF =
CFDictionaryGetValue(usbProperties,
CFSTR("USB Product Name"));
if (refCF) {
if (!CFStringGetCString
(refCF, pDevice->product, 256,
CFStringGetSystemEncoding()))
SDL_SetError
("CFStringGetCString error retrieving pDevice->product.");
}
/* get usage page and usage */
refCF =
CFDictionaryGetValue(hidProperties,
CFSTR(kIOHIDPrimaryUsagePageKey));
if (refCF) {
if (!CFNumberGetValue
(refCF, kCFNumberLongType, &pDevice->usagePage))
SDL_SetError
("CFNumberGetValue error retrieving pDevice->usagePage.");
refCF =
CFDictionaryGetValue(hidProperties,
CFSTR(kIOHIDPrimaryUsageKey));
if (refCF)
if (!CFNumberGetValue
(refCF, kCFNumberLongType, &pDevice->usage))
SDL_SetError
("CFNumberGetValue error retrieving pDevice->usage.");
}
if (NULL == refCF) { /* get top level element HID usage page or usage */
/* use top level element instead */
CFTypeRef refCFTopElement = 0;
refCFTopElement =
CFDictionaryGetValue(hidProperties,
CFSTR(kIOHIDElementKey));
{
/* refCFTopElement points to an array of element dictionaries */
CFRange range = { 0, CFArrayGetCount(refCFTopElement) };
CFArrayApplyFunction(refCFTopElement, range,
HIDTopLevelElementHandler, pDevice);
}
}
CFRelease(usbProperties);
} else
SDL_SetError
("IORegistryEntryCreateCFProperties failed to create usbProperties.");
if (kIOReturnSuccess != IOObjectRelease(parent2))
SDL_SetError("IOObjectRelease error with parent2.");
if (kIOReturnSuccess != IOObjectRelease(parent1))
SDL_SetError("IOObjectRelease error with parent1.");
}
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}
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static recDevice *
HIDBuildDevice(io_object_t hidDevice)
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{
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recDevice *pDevice = (recDevice *) NewPtrClear(sizeof(recDevice));
if (pDevice) {
/* get dictionary for HID properties */
CFMutableDictionaryRef hidProperties = 0;
kern_return_t result =
IORegistryEntryCreateCFProperties(hidDevice, &hidProperties,
kCFAllocatorDefault,
kNilOptions);
if ((result == KERN_SUCCESS) && hidProperties) {
/* create device interface */
result = HIDCreateOpenDeviceInterface(hidDevice, pDevice);
if (kIOReturnSuccess == result) {
HIDGetDeviceInfo(hidDevice, hidProperties, pDevice); /* hidDevice used to find parents in registry tree */
HIDGetCollectionElements(hidProperties, pDevice);
} else {
DisposePtr((Ptr) pDevice);
pDevice = NULL;
}
CFRelease(hidProperties);
} else {
DisposePtr((Ptr) pDevice);
pDevice = NULL;
}
}
return pDevice;
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}
/* disposes of the element list associated with a device and the memory associated with the list
*/
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static void
HIDDisposeElementList(recElement ** elementList)
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{
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recElement *pElement = *elementList;
while (pElement) {
recElement *pElementNext = pElement->pNext;
DisposePtr((Ptr) pElement);
pElement = pElementNext;
}
*elementList = NULL;
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}
/* disposes of a single device, closing and releaseing interface, freeing memory fro device and elements, setting device pointer to NULL
* all your device no longer belong to us... (i.e., you do not 'own' the device anymore)
*/
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static recDevice *
HIDDisposeDevice(recDevice ** ppDevice)
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{
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kern_return_t result = KERN_SUCCESS;
recDevice *pDeviceNext = NULL;
if (*ppDevice) {
/* save next device prior to disposing of this device */
pDeviceNext = (*ppDevice)->pNext;
/* free element lists */
HIDDisposeElementList(&(*ppDevice)->firstAxis);
HIDDisposeElementList(&(*ppDevice)->firstButton);
HIDDisposeElementList(&(*ppDevice)->firstHat);
result = HIDCloseReleaseInterface(*ppDevice); /* function sanity checks interface value (now application does not own device) */
if (kIOReturnSuccess != result)
HIDReportErrorNum
("HIDCloseReleaseInterface failed when trying to dipose device.",
result);
DisposePtr((Ptr) * ppDevice);
*ppDevice = NULL;
}
return pDeviceNext;
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}
/* Function to scan the system for joysticks.
* Joystick 0 should be the system default joystick.
* This function should return the number of available joysticks, or -1
* on an unrecoverable fatal error.
*/
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int
SDL_SYS_JoystickInit(void)
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{
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IOReturn result = kIOReturnSuccess;
mach_port_t masterPort = 0;
io_iterator_t hidObjectIterator = 0;
CFMutableDictionaryRef hidMatchDictionary = NULL;
recDevice *device, *lastDevice;
io_object_t ioHIDDeviceObject = 0;
SDL_numjoysticks = 0;
if (gpDeviceList) {
SDL_SetError("Joystick: Device list already inited.");
return -1;
}
result = IOMasterPort(bootstrap_port, &masterPort);
if (kIOReturnSuccess != result) {
SDL_SetError("Joystick: IOMasterPort error with bootstrap_port.");
return -1;
}
/* Set up a matching dictionary to search I/O Registry by class name for all HID class devices. */
hidMatchDictionary = IOServiceMatching(kIOHIDDeviceKey);
if (hidMatchDictionary) {
/* Add key for device type (joystick, in this case) to refine the matching dictionary. */
/* NOTE: we now perform this filtering later
UInt32 usagePage = kHIDPage_GenericDesktop;
UInt32 usage = kHIDUsage_GD_Joystick;
CFNumberRef refUsage = NULL, refUsagePage = NULL;
refUsage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usage);
CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsageKey), refUsage);
refUsagePage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usagePage);
CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsagePageKey), refUsagePage);
*/
} else {
SDL_SetError
("Joystick: Failed to get HID CFMutableDictionaryRef via IOServiceMatching.");
return -1;
}
/*/ Now search I/O Registry for matching devices. */
result =
IOServiceGetMatchingServices(masterPort, hidMatchDictionary,
&hidObjectIterator);
/* Check for errors */
if (kIOReturnSuccess != result) {
SDL_SetError("Joystick: Couldn't create a HID object iterator.");
return -1;
}
if (!hidObjectIterator) { /* there are no joysticks */
gpDeviceList = NULL;
SDL_numjoysticks = 0;
return 0;
}
/* IOServiceGetMatchingServices consumes a reference to the dictionary, so we don't need to release the dictionary ref. */
/* build flat linked list of devices from device iterator */
gpDeviceList = lastDevice = NULL;
while ((ioHIDDeviceObject = IOIteratorNext(hidObjectIterator))) {
/* build a device record */
device = HIDBuildDevice(ioHIDDeviceObject);
if (!device)
continue;
/* dump device object, it is no longer needed */
result = IOObjectRelease(ioHIDDeviceObject);
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/* if (KERN_SUCCESS != result)
HIDReportErrorNum ("IOObjectRelease error with ioHIDDeviceObject.", result);
*/
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/* Filter device list to non-keyboard/mouse stuff */
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if ((device->usagePage != kHIDPage_GenericDesktop) ||
((device->usage != kHIDUsage_GD_Joystick &&
device->usage != kHIDUsage_GD_GamePad &&
device->usage != kHIDUsage_GD_MultiAxisController))) {
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/* release memory for the device */
HIDDisposeDevice(&device);
DisposePtr((Ptr) device);
continue;
}
/* Add device to the end of the list */
if (lastDevice)
lastDevice->pNext = device;
else
gpDeviceList = device;
lastDevice = device;
}
result = IOObjectRelease(hidObjectIterator); /* release the iterator */
/* Count the total number of devices we found */
device = gpDeviceList;
while (device) {
SDL_numjoysticks++;
device = device->pNext;
}
return SDL_numjoysticks;
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}
/* Function to get the device-dependent name of a joystick */
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const char *
SDL_SYS_JoystickName(int index)
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{
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recDevice *device = gpDeviceList;
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for (; index > 0; index--)
device = device->pNext;
return device->product;
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}
/* Function to open a joystick for use.
* The joystick to open is specified by the index field of the joystick.
* This should fill the nbuttons and naxes fields of the joystick structure.
* It returns 0, or -1 if there is an error.
*/
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int
SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
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{
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recDevice *device = gpDeviceList;
int index;
for (index = joystick->index; index > 0; index--)
device = device->pNext;
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joystick->hwdata = device;
joystick->name = device->product;
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joystick->naxes = device->axes;
joystick->nhats = device->hats;
joystick->nballs = 0;
joystick->nbuttons = device->buttons;
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return 0;
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}
/* Function to update the state of a joystick - called as a device poll.
* This function shouldn't update the joystick structure directly,
* but instead should call SDL_PrivateJoystick*() to deliver events
* and update joystick device state.
*/
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void
SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
721
{
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recDevice *device = joystick->hwdata;
recElement *element;
724
SInt32 value, range;
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int i;
if (device->removed) { /* device was unplugged; ignore it. */
if (device->uncentered) {
device->uncentered = 0;
/* Tell the app that everything is centered/unpressed... */
for (i = 0; i < device->axes; i++)
SDL_PrivateJoystickAxis(joystick, i, 0);
for (i = 0; i < device->buttons; i++)
SDL_PrivateJoystickButton(joystick, i, 0);
for (i = 0; i < device->hats; i++)
SDL_PrivateJoystickHat(joystick, i, SDL_HAT_CENTERED);
}
return;
}
element = device->firstAxis;
i = 0;
while (element) {
value = HIDScaledCalibratedValue(device, element, -32768, 32767);
if (value != joystick->axes[i])
SDL_PrivateJoystickAxis(joystick, i, value);
element = element->pNext;
++i;
}
element = device->firstButton;
i = 0;
while (element) {
value = HIDGetElementValue(device, element);
if (value > 1) /* handle pressure-sensitive buttons */
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value = 1;
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if (value != joystick->buttons[i])
SDL_PrivateJoystickButton(joystick, i, value);
element = element->pNext;
++i;
}
element = device->firstHat;
i = 0;
while (element) {
Uint8 pos = 0;
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range = (element->max - element->min + 1);
value = HIDGetElementValue(device, element) - element->min;
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if (range == 4) /* 4 position hatswitch - scale up value */
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value *= 2;
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else if (range != 8) /* Neither a 4 nor 8 positions - fall back to default position (centered) */
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value = -1;
switch (value) {
case 0:
pos = SDL_HAT_UP;
break;
case 1:
pos = SDL_HAT_RIGHTUP;
break;
case 2:
pos = SDL_HAT_RIGHT;
break;
case 3:
pos = SDL_HAT_RIGHTDOWN;
break;
case 4:
pos = SDL_HAT_DOWN;
break;
case 5:
pos = SDL_HAT_LEFTDOWN;
break;
case 6:
pos = SDL_HAT_LEFT;
break;
case 7:
pos = SDL_HAT_LEFTUP;
break;
default:
/* Every other value is mapped to center. We do that because some
* joysticks use 8 and some 15 for this value, and apparently
* there are even more variants out there - so we try to be generous.
*/
pos = SDL_HAT_CENTERED;
break;
}
if (pos != joystick->hats[i])
SDL_PrivateJoystickHat(joystick, i, pos);
element = element->pNext;
++i;
}
return;
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}
/* Function to close a joystick after use */
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void
SDL_SYS_JoystickClose(SDL_Joystick * joystick)
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{
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/* Should we do anything here? */
return;
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}
/* Function to perform any system-specific joystick related cleanup */
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void
SDL_SYS_JoystickQuit(void)
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{
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while (NULL != gpDeviceList)
gpDeviceList = HIDDisposeDevice(&gpDeviceList);
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}
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#endif /* SDL_JOYSTICK_IOKIT */
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/* vi: set ts=4 sw=4 expandtab: */