src/joystick/darwin/SDL_sysjoystick.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 31 Dec 2011 09:16:08 -0500
branchSDL-1.2
changeset 6137 4720145f848b
parent 5618 a427a0e16ca4
child 7625 952791dbe6ba
permissions -rw-r--r--
Happy New Year!
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/*
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	SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2012 Sam Lantinga
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	This library is free software; you can redistribute it and/or
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	modify it under the terms of the GNU Library General Public
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	License as published by the Free Software Foundation; either
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	version 2 of the License, or (at your option) any later version.
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	This library is distributed in the hope that it will be useful,
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	but WITHOUT ANY WARRANTY; without even the implied warranty of
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	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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	Library General Public License for more details.
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	You should have received a copy of the GNU Library General Public
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	License along with this library; if not, write to the Free
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	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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	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 */
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#include <unistd.h>
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#include <ctype.h>
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#include <sysexits.h>
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#include <mach/mach.h>
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#include <mach/mach_error.h>
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#include <IOKit/IOKitLib.h>
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#include <IOKit/IOCFPlugIn.h>
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#ifdef MACOS_10_0_4
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#include <IOKit/hidsystem/IOHIDUsageTables.h>
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#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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#include <IOKit/hid/IOHIDLib.h>
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#include <IOKit/hid/IOHIDKeys.h>
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#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"
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#include "../SDL_joystick_c.h"
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struct recElement
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{
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	IOHIDElementCookie cookie;				/* unique value which identifies element, will NOT change */
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	long min;								/* reported min value possible */
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	long max;								/* reported max value possible */
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#if 0
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	/* TODO: maybe should handle the following stuff somehow? */
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	long scaledMin;							/* reported scaled min value possible */
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	long scaledMax;							/* reported scaled max value possible */
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	long size;								/* size in bits of data return from element */
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	Boolean relative;						/* are reports relative to last report (deltas) */
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	Boolean wrapping;						/* does element wrap around (one value higher than max is min) */
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	Boolean nonLinear;						/* are the values reported non-linear relative to element movement */
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	Boolean preferredState;					/* does element have a preferred state (such as a button) */
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	Boolean nullState;						/* does element have null state */
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#endif /* 0 */
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	/* runtime variables used for auto-calibration */
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	long minReport;							/* min returned value */
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	long maxReport;							/* max returned value */
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	struct recElement * pNext;				/* next element in list */
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};
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typedef struct recElement recElement;
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struct joystick_hwdata
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{
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	IOHIDDeviceInterface ** interface;		/* interface to device, NULL = no interface */
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	char product[256];							/* name of product */
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	long usage;								/* usage page from IOUSBHID Parser.h which defines general usage */
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	long usagePage;							/* usage within above page from IOUSBHID Parser.h which defines specific usage */
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	long axes;								/* number of axis (calculated, not reported by device) */
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	long buttons;							/* number of buttons (calculated, not reported by device) */
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	long hats;								/* number of hat switches (calculated, not reported by device) */
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	long elements;							/* number of total elements (shouldbe total of above) (calculated, not reported by device) */
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	recElement* firstAxis;
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	recElement* firstButton;
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	recElement* firstHat;
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	int removed;
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	int uncentered;
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	struct joystick_hwdata* pNext;			/* next device */
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};
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typedef struct joystick_hwdata recDevice;
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/* Linked list of all available devices */
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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
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 * will return 0 on error conditions which should be accounted for by application
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 */
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static SInt32 HIDGetElementValue (recDevice *pDevice, recElement *pElement)
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{
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	IOReturn result = kIOReturnSuccess;
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	IOHIDEventStruct hidEvent;
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	hidEvent.value = 0;
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	if (NULL != pDevice && NULL != pElement && NULL != pDevice->interface)
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	{
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		result = (*(pDevice->interface))->getElementValue(pDevice->interface, pElement->cookie, &hidEvent);
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		if (kIOReturnSuccess == result)
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		{
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			/* record min and max for auto calibration */
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			if (hidEvent.value < pElement->minReport)
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				pElement->minReport = hidEvent.value;
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			if (hidEvent.value > pElement->maxReport)
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				pElement->maxReport = hidEvent.value;
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		}
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	}
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	/* auto user scale */
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	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;
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	float readScale = pElement->maxReport - pElement->minReport;
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	SInt32 value = HIDGetElementValue(pDevice, pElement);
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	if (readScale == 0)
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		return value; /* no scaling at all */
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	else
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		return ((value - pElement->minReport) * deviceScale / readScale) + min;
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}
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static void HIDRemovalCallback(void * target,
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                               IOReturn result,
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                               void * refcon,
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                               void * sender)
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{
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	recDevice *device = (recDevice *) refcon;
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	device->removed = 1;
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	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.
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 * Note: appliction now owns the device and must close and release it prior to exiting
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 */
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static IOReturn HIDCreateOpenDeviceInterface (io_object_t hidDevice, recDevice *pDevice)
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{
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	IOReturn result = kIOReturnSuccess;
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	HRESULT plugInResult = S_OK;
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	SInt32 score = 0;
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	IOCFPlugInInterface ** ppPlugInInterface = NULL;
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	if (NULL == pDevice->interface)
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	{
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		result = IOCreatePlugInInterfaceForService (hidDevice, kIOHIDDeviceUserClientTypeID,
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													kIOCFPlugInInterfaceID, &ppPlugInInterface, &score);
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		if (kIOReturnSuccess == result)
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		{
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			/* Call a method of the intermediate plug-in to create the device interface */
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			plugInResult = (*ppPlugInInterface)->QueryInterface (ppPlugInInterface,
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								CFUUIDGetUUIDBytes (kIOHIDDeviceInterfaceID), (void *) &(pDevice->interface));
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			if (S_OK != plugInResult)
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				HIDReportErrorNum ("CouldnŐt query HID class device interface from plugInInterface", plugInResult);
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			(*ppPlugInInterface)->Release (ppPlugInInterface);
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		}
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		else
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			HIDReportErrorNum ("Failed to create **plugInInterface via IOCreatePlugInInterfaceForService.", result);
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	}
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	if (NULL != pDevice->interface)
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	{
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		result = (*(pDevice->interface))->open (pDevice->interface, 0);
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		if (kIOReturnSuccess != result)
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			HIDReportErrorNum ("Failed to open pDevice->interface via open.", result);
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		else
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			(*(pDevice->interface))->setRemovalCallback (pDevice->interface, HIDRemovalCallback, pDevice, pDevice);
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	}
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	return result;
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}
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/* Closes and releases interface to device, should be done prior to exting application
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 * Note: will have no affect if device or interface do not exist
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 * application will "own" the device if interface is not closed
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 * (device may have to be plug and re-plugged in different location to get it working again without a restart)
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 */
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static IOReturn HIDCloseReleaseInterface (recDevice *pDevice)
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{
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	IOReturn result = kIOReturnSuccess;
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	if ((NULL != pDevice) && (NULL != pDevice->interface))
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	{
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		/* close the interface */
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		result = (*(pDevice->interface))->close (pDevice->interface);
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		if (kIOReturnNotOpen == result)
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		{
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			/* do nothing as device was not opened, thus can't be closed */
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		}
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		else if (kIOReturnSuccess != result)
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			HIDReportErrorNum ("Failed to close IOHIDDeviceInterface.", result);
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		/* release the interface */
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		result = (*(pDevice->interface))->Release (pDevice->interface);
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		if (kIOReturnSuccess != result)
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			HIDReportErrorNum ("Failed to release IOHIDDeviceInterface.", result);
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		pDevice->interface = NULL;
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	}	
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	return result;
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}
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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;
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	CFTypeRef refType;
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementCookieKey));
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	if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
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		pElement->cookie = (IOHIDElementCookie) number;
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementMinKey));
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	if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
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		pElement->minReport = pElement->min = number;
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementMaxKey));
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	if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
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		pElement->maxReport = pElement->max = number;
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/*
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	TODO: maybe should handle the following stuff somehow?
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementScaledMinKey));
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	if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
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		pElement->scaledMin = number;
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementScaledMaxKey));
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	if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
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		pElement->scaledMax = number;
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementSizeKey));
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	if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
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		pElement->size = number;
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsRelativeKey));
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	if (refType)
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		pElement->relative = CFBooleanGetValue (refType);
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsWrappingKey));
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	if (refType)
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		pElement->wrapping = CFBooleanGetValue (refType);
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsNonLinearKey));
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	if (refType)
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		pElement->nonLinear = CFBooleanGetValue (refType);
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementHasPreferedStateKey));
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	if (refType)
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		pElement->preferredState = CFBooleanGetValue (refType);
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementHasNullStateKey));
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	if (refType)
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		pElement->nullState = CFBooleanGetValue (refType);
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*/
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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
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 * if element of interest allocate storage, add to list and retrieve element specific info
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 * if collection then pass on to deconstruction collection into additional individual elements
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 */
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static void HIDAddElement (CFTypeRef refElement, recDevice* pDevice)
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{
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	recElement* element = NULL;
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	recElement** headElement = NULL;
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	long elementType, usagePage, usage;
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	CFTypeRef refElementType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementTypeKey));
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	CFTypeRef refUsagePage = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementUsagePageKey));
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	CFTypeRef refUsage = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementUsageKey));
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   292
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	if ((refElementType) && (CFNumberGetValue (refElementType, kCFNumberLongType, &elementType)))
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	{
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		/* look at types of interest */
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		if ((elementType == kIOHIDElementTypeInput_Misc) || (elementType == kIOHIDElementTypeInput_Button) ||
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			(elementType == kIOHIDElementTypeInput_Axis))
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		{
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			if (refUsagePage && CFNumberGetValue (refUsagePage, kCFNumberLongType, &usagePage) &&
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				refUsage && CFNumberGetValue (refUsage, kCFNumberLongType, &usage))
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			{
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				switch (usagePage) /* only interested in kHIDPage_GenericDesktop and kHIDPage_Button */
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				{
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					case kHIDPage_GenericDesktop:
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						{
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							switch (usage) /* look at usage to determine function */
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							{
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								case kHIDUsage_GD_X:
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								case kHIDUsage_GD_Y:
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								case kHIDUsage_GD_Z:
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								case kHIDUsage_GD_Rx:
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								case kHIDUsage_GD_Ry:
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								case kHIDUsage_GD_Rz:
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								case kHIDUsage_GD_Slider:
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								case kHIDUsage_GD_Dial:
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								case kHIDUsage_GD_Wheel:
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									element = (recElement *) NewPtrClear (sizeof (recElement));
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									if (element)
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									{
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										pDevice->axes++;
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										headElement = &(pDevice->firstAxis);
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									}
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								break;
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								case kHIDUsage_GD_Hatswitch:
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									element = (recElement *) NewPtrClear (sizeof (recElement));
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									if (element)
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									{
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										pDevice->hats++;
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										headElement = &(pDevice->firstHat);
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									}
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								break;
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							}							
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						}
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						break;
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					case kHIDPage_Button:
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						element = (recElement *) NewPtrClear (sizeof (recElement));
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						if (element)
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						{
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							pDevice->buttons++;
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							headElement = &(pDevice->firstButton);
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						}
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						break;
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					default:
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						break;
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				}
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			}
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		}
slouken@172
   348
		else if (kIOHIDElementTypeCollection == elementType)
slouken@172
   349
			HIDGetCollectionElements ((CFMutableDictionaryRef) refElement, pDevice);
slouken@172
   350
	}
slouken@172
   351
slouken@172
   352
	if (element && headElement) /* add to list */
slouken@172
   353
	{
slouken@172
   354
		pDevice->elements++;
slouken@172
   355
		if (NULL == *headElement)
slouken@172
   356
			*headElement = element;
slouken@172
   357
		else
slouken@172
   358
		{
slouken@172
   359
			recElement *elementPrevious, *elementCurrent;
slouken@172
   360
			elementCurrent = *headElement;
slouken@172
   361
			while (elementCurrent)
slouken@172
   362
			{
slouken@172
   363
				elementPrevious = elementCurrent;
slouken@172
   364
				elementCurrent = elementPrevious->pNext;
slouken@172
   365
			}
slouken@172
   366
			elementPrevious->pNext = element;
slouken@172
   367
		}
slouken@172
   368
		element->pNext = NULL;
slouken@172
   369
		HIDGetElementInfo (refElement, element);
slouken@172
   370
	}
slouken@172
   371
}
slouken@172
   372
slouken@172
   373
/* collects information from each array member in device element list (each array memeber = element) */
slouken@172
   374
slouken@172
   375
static void HIDGetElementsCFArrayHandler (const void * value, void * parameter)
slouken@172
   376
{
slouken@172
   377
	if (CFGetTypeID (value) == CFDictionaryGetTypeID ())
slouken@172
   378
		HIDAddElement ((CFTypeRef) value, (recDevice *) parameter);
slouken@172
   379
}
slouken@172
   380
slouken@172
   381
/* handles retrieval of element information from arrays of elements in device IO registry information */
slouken@172
   382
slouken@172
   383
static void HIDGetElements (CFTypeRef refElementCurrent, recDevice *pDevice)
slouken@172
   384
{
slouken@172
   385
	CFTypeID type = CFGetTypeID (refElementCurrent);
slouken@172
   386
	if (type == CFArrayGetTypeID()) /* if element is an array */
slouken@172
   387
	{
slouken@172
   388
		CFRange range = {0, CFArrayGetCount (refElementCurrent)};
slouken@172
   389
		/* CountElementsCFArrayHandler called for each array member */
slouken@172
   390
		CFArrayApplyFunction (refElementCurrent, range, HIDGetElementsCFArrayHandler, pDevice);
slouken@172
   391
	}
slouken@172
   392
}			
slouken@172
   393
slouken@172
   394
/* handles extracting element information from element collection CF types
slouken@172
   395
 * used from top level element decoding and hierarchy deconstruction to flatten device element list
slouken@172
   396
 */
slouken@172
   397
slouken@172
   398
static void HIDGetCollectionElements (CFMutableDictionaryRef deviceProperties, recDevice *pDevice)
slouken@172
   399
{
slouken@172
   400
	CFTypeRef refElementTop = CFDictionaryGetValue (deviceProperties, CFSTR(kIOHIDElementKey));
slouken@172
   401
	if (refElementTop)
slouken@172
   402
		HIDGetElements (refElementTop, pDevice);
slouken@172
   403
}
slouken@172
   404
slouken@172
   405
/* use top level element usage page and usage to discern device usage page and usage setting appropriate vlaues in device record */
slouken@172
   406
slouken@172
   407
static void HIDTopLevelElementHandler (const void * value, void * parameter)
slouken@172
   408
{
slouken@172
   409
	CFTypeRef refCF = 0;
slouken@172
   410
	if (CFGetTypeID (value) != CFDictionaryGetTypeID ())
slouken@172
   411
		return;
slouken@172
   412
	refCF = CFDictionaryGetValue (value, CFSTR(kIOHIDElementUsagePageKey));
slouken@172
   413
	if (!CFNumberGetValue (refCF, kCFNumberLongType, &((recDevice *) parameter)->usagePage))
slouken@172
   414
		SDL_SetError ("CFNumberGetValue error retrieving pDevice->usagePage.");
slouken@172
   415
	refCF = CFDictionaryGetValue (value, CFSTR(kIOHIDElementUsageKey));
slouken@172
   416
	if (!CFNumberGetValue (refCF, kCFNumberLongType, &((recDevice *) parameter)->usage))
slouken@172
   417
		SDL_SetError ("CFNumberGetValue error retrieving pDevice->usage.");
slouken@172
   418
}
slouken@172
   419
slouken@172
   420
/* extracts device info from CF dictionary records in IO registry */
slouken@172
   421
slouken@172
   422
static void HIDGetDeviceInfo (io_object_t hidDevice, CFMutableDictionaryRef hidProperties, recDevice *pDevice)
slouken@172
   423
{
slouken@172
   424
	CFMutableDictionaryRef usbProperties = 0;
slouken@172
   425
	io_registry_entry_t parent1, parent2;
slouken@172
   426
	
slouken@172
   427
	/* Mac OS X currently is not mirroring all USB properties to HID page so need to look at USB device page also
slouken@172
   428
	 * get dictionary for usb properties: step up two levels and get CF dictionary for USB properties
slouken@172
   429
	 */
slouken@172
   430
	if ((KERN_SUCCESS == IORegistryEntryGetParentEntry (hidDevice, kIOServicePlane, &parent1)) &&
slouken@172
   431
		(KERN_SUCCESS == IORegistryEntryGetParentEntry (parent1, kIOServicePlane, &parent2)) &&
slouken@172
   432
		(KERN_SUCCESS == IORegistryEntryCreateCFProperties (parent2, &usbProperties, kCFAllocatorDefault, kNilOptions)))
slouken@172
   433
	{
slouken@172
   434
		if (usbProperties)
slouken@172
   435
		{
slouken@172
   436
			CFTypeRef refCF = 0;
slouken@172
   437
			/* get device info
slouken@172
   438
			 * try hid dictionary first, if fail then go to usb dictionary
slouken@172
   439
			 */
slouken@172
   440
			
slouken@172
   441
			
slouken@172
   442
			/* get product name */
slouken@172
   443
			refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDProductKey));
slouken@172
   444
			if (!refCF)
slouken@172
   445
				refCF = CFDictionaryGetValue (usbProperties, CFSTR("USB Product Name"));
slouken@172
   446
			if (refCF)
slouken@172
   447
			{
slouken@172
   448
				if (!CFStringGetCString (refCF, pDevice->product, 256, CFStringGetSystemEncoding ()))
slouken@172
   449
					SDL_SetError ("CFStringGetCString error retrieving pDevice->product.");
slouken@172
   450
			}
slouken@172
   451
			
slouken@172
   452
			/* get usage page and usage */
slouken@172
   453
			refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDPrimaryUsagePageKey));
slouken@172
   454
			if (refCF)
slouken@172
   455
			{
slouken@172
   456
				if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->usagePage))
slouken@172
   457
					SDL_SetError ("CFNumberGetValue error retrieving pDevice->usagePage.");
slouken@172
   458
				refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDPrimaryUsageKey));
slouken@172
   459
				if (refCF)
slouken@172
   460
					if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->usage))
slouken@172
   461
						SDL_SetError ("CFNumberGetValue error retrieving pDevice->usage.");
slouken@172
   462
			}
slouken@172
   463
slouken@172
   464
			if (NULL == refCF) /* get top level element HID usage page or usage */
slouken@172
   465
			{
slouken@172
   466
				/* use top level element instead */
slouken@172
   467
				CFTypeRef refCFTopElement = 0;
slouken@172
   468
				refCFTopElement = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDElementKey));
slouken@172
   469
				{
slouken@172
   470
					/* refCFTopElement points to an array of element dictionaries */
slouken@172
   471
					CFRange range = {0, CFArrayGetCount (refCFTopElement)};
slouken@172
   472
					CFArrayApplyFunction (refCFTopElement, range, HIDTopLevelElementHandler, pDevice);
slouken@172
   473
				}
slouken@172
   474
			}
slouken@172
   475
slouken@172
   476
			CFRelease (usbProperties);
slouken@172
   477
		}
slouken@172
   478
		else
slouken@172
   479
			SDL_SetError ("IORegistryEntryCreateCFProperties failed to create usbProperties.");
slouken@172
   480
slouken@172
   481
		if (kIOReturnSuccess != IOObjectRelease (parent2))
slouken@172
   482
			SDL_SetError ("IOObjectRelease error with parent2.");
slouken@172
   483
		if (kIOReturnSuccess != IOObjectRelease (parent1))
slouken@172
   484
			SDL_SetError ("IOObjectRelease error with parent1.");
slouken@172
   485
	}
slouken@172
   486
}
slouken@172
   487
slouken@172
   488
slouken@172
   489
static recDevice *HIDBuildDevice (io_object_t hidDevice)
slouken@172
   490
{
slouken@172
   491
	recDevice *pDevice = (recDevice *) NewPtrClear (sizeof (recDevice));
slouken@172
   492
	if (pDevice)
slouken@172
   493
	{
slouken@172
   494
		/* get dictionary for HID properties */
slouken@172
   495
		CFMutableDictionaryRef hidProperties = 0;
slouken@172
   496
		kern_return_t result = IORegistryEntryCreateCFProperties (hidDevice, &hidProperties, kCFAllocatorDefault, kNilOptions);
slouken@172
   497
		if ((result == KERN_SUCCESS) && hidProperties)
slouken@172
   498
		{
slouken@172
   499
			/* create device interface */
slouken@172
   500
			result = HIDCreateOpenDeviceInterface (hidDevice, pDevice);
slouken@172
   501
			if (kIOReturnSuccess == result)
slouken@172
   502
			{
slouken@172
   503
				HIDGetDeviceInfo (hidDevice, hidProperties, pDevice); /* hidDevice used to find parents in registry tree */
slouken@172
   504
				HIDGetCollectionElements (hidProperties, pDevice);
slouken@172
   505
			}
slouken@172
   506
			else
slouken@172
   507
			{
slouken@210
   508
				DisposePtr((Ptr)pDevice);
slouken@172
   509
				pDevice = NULL;
slouken@172
   510
			}
slouken@172
   511
			CFRelease (hidProperties);
slouken@172
   512
		}
slouken@172
   513
		else
slouken@172
   514
		{
slouken@210
   515
			DisposePtr((Ptr)pDevice);
slouken@172
   516
			pDevice = NULL;
slouken@172
   517
		}
slouken@172
   518
	}
slouken@172
   519
	return pDevice;
slouken@172
   520
}
slouken@172
   521
slouken@172
   522
/* disposes of the element list associated with a device and the memory associated with the list
slouken@172
   523
 */
slouken@172
   524
slouken@172
   525
static void HIDDisposeElementList (recElement **elementList)
slouken@172
   526
{
slouken@172
   527
	recElement *pElement = *elementList;
slouken@172
   528
	while (pElement)
slouken@172
   529
	{
slouken@172
   530
		recElement *pElementNext = pElement->pNext;
slouken@172
   531
		DisposePtr ((Ptr) pElement);
slouken@172
   532
		pElement = pElementNext;
slouken@172
   533
	}
slouken@172
   534
	*elementList = NULL;
slouken@172
   535
}
slouken@172
   536
slouken@172
   537
/* disposes of a single device, closing and releaseing interface, freeing memory fro device and elements, setting device pointer to NULL
slouken@172
   538
 * all your device no longer belong to us... (i.e., you do not 'own' the device anymore)
slouken@172
   539
 */
slouken@172
   540
slouken@172
   541
static recDevice *HIDDisposeDevice (recDevice **ppDevice)
slouken@172
   542
{
slouken@172
   543
	kern_return_t result = KERN_SUCCESS;
slouken@172
   544
	recDevice *pDeviceNext = NULL;
slouken@172
   545
	if (*ppDevice)
slouken@172
   546
	{
slouken@1487
   547
		/* save next device prior to disposing of this device */
slouken@172
   548
		pDeviceNext = (*ppDevice)->pNext;
slouken@172
   549
		
slouken@172
   550
		/* free element lists */
slouken@172
   551
		HIDDisposeElementList (&(*ppDevice)->firstAxis);
slouken@172
   552
		HIDDisposeElementList (&(*ppDevice)->firstButton);
slouken@172
   553
		HIDDisposeElementList (&(*ppDevice)->firstHat);
slouken@172
   554
		
slouken@172
   555
		result = HIDCloseReleaseInterface (*ppDevice); /* function sanity checks interface value (now application does not own device) */
slouken@172
   556
		if (kIOReturnSuccess != result)
slouken@172
   557
			HIDReportErrorNum ("HIDCloseReleaseInterface failed when trying to dipose device.", result);
slouken@172
   558
		DisposePtr ((Ptr)*ppDevice);
slouken@172
   559
		*ppDevice = NULL;
slouken@172
   560
	}
slouken@172
   561
	return pDeviceNext;
slouken@172
   562
}
slouken@172
   563
slouken@172
   564
slouken@172
   565
/* Function to scan the system for joysticks.
slouken@172
   566
 * Joystick 0 should be the system default joystick.
slouken@172
   567
 * This function should return the number of available joysticks, or -1
slouken@172
   568
 * on an unrecoverable fatal error.
slouken@172
   569
 */
slouken@172
   570
int SDL_SYS_JoystickInit(void)
slouken@172
   571
{
slouken@172
   572
	IOReturn result = kIOReturnSuccess;
slouken@1409
   573
	mach_port_t masterPort = 0;
slouken@1409
   574
	io_iterator_t hidObjectIterator = 0;
slouken@172
   575
	CFMutableDictionaryRef hidMatchDictionary = NULL;
slouken@172
   576
	recDevice *device, *lastDevice;
slouken@1409
   577
	io_object_t ioHIDDeviceObject = 0;
slouken@172
   578
	
slouken@172
   579
	SDL_numjoysticks = 0;
slouken@172
   580
	
slouken@1496
   581
	if (gpDeviceList)
slouken@172
   582
	{
slouken@172
   583
		SDL_SetError("Joystick: Device list already inited.");
slouken@172
   584
		return -1;
slouken@172
   585
	}
slouken@172
   586
	
slouken@172
   587
	result = IOMasterPort (bootstrap_port, &masterPort);
slouken@172
   588
	if (kIOReturnSuccess != result)
slouken@172
   589
	{
slouken@172
   590
		SDL_SetError("Joystick: IOMasterPort error with bootstrap_port.");
slouken@172
   591
		return -1;
slouken@172
   592
	}
slouken@172
   593
slouken@172
   594
	/* Set up a matching dictionary to search I/O Registry by class name for all HID class devices. */
slouken@172
   595
	hidMatchDictionary = IOServiceMatching (kIOHIDDeviceKey);
slouken@1409
   596
	if (hidMatchDictionary)
slouken@172
   597
	{
slouken@172
   598
		/* Add key for device type (joystick, in this case) to refine the matching dictionary. */
slouken@495
   599
		
slouken@495
   600
		/* NOTE: we now perform this filtering later
slouken@495
   601
		UInt32 usagePage = kHIDPage_GenericDesktop;
slouken@495
   602
		UInt32 usage = kHIDUsage_GD_Joystick;
slouken@172
   603
		CFNumberRef refUsage = NULL, refUsagePage = NULL;
slouken@172
   604
slouken@475
   605
		refUsage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usage);
slouken@172
   606
		CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsageKey), refUsage);
slouken@475
   607
		refUsagePage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usagePage);
slouken@172
   608
		CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsagePageKey), refUsagePage);
slouken@495
   609
		*/
slouken@172
   610
	}
slouken@172
   611
	else
slouken@172
   612
	{
slouken@172
   613
		SDL_SetError("Joystick: Failed to get HID CFMutableDictionaryRef via IOServiceMatching.");
slouken@172
   614
		return -1;
slouken@172
   615
	}
slouken@172
   616
	
slouken@172
   617
	/*/ Now search I/O Registry for matching devices. */
slouken@172
   618
	result = IOServiceGetMatchingServices (masterPort, hidMatchDictionary, &hidObjectIterator);
slouken@172
   619
	/* Check for errors */
slouken@427
   620
	if (kIOReturnSuccess != result)
slouken@172
   621
	{
slouken@172
   622
		SDL_SetError("Joystick: Couldn't create a HID object iterator.");
slouken@172
   623
		return -1;
slouken@172
   624
	}
slouken@1409
   625
	if (!hidObjectIterator) /* there are no joysticks */
slouken@427
   626
	{
slouken@427
   627
		gpDeviceList = NULL;
slouken@427
   628
		SDL_numjoysticks = 0;
slouken@427
   629
		return 0;
slouken@427
   630
	}
slouken@172
   631
	/* IOServiceGetMatchingServices consumes a reference to the dictionary, so we don't need to release the dictionary ref. */
slouken@172
   632
slouken@172
   633
	/* build flat linked list of devices from device iterator */
slouken@172
   634
slouken@172
   635
	gpDeviceList = lastDevice = NULL;
slouken@172
   636
	
slouken@172
   637
	while ((ioHIDDeviceObject = IOIteratorNext (hidObjectIterator)))
slouken@172
   638
	{
slouken@172
   639
		/* build a device record */
slouken@172
   640
		device = HIDBuildDevice (ioHIDDeviceObject);
slouken@172
   641
		if (!device)
slouken@172
   642
			continue;
slouken@172
   643
slouken@172
   644
		/* dump device object, it is no longer needed */
slouken@172
   645
		result = IOObjectRelease (ioHIDDeviceObject);
slouken@1487
   646
/*		if (KERN_SUCCESS != result)
slouken@1487
   647
			HIDReportErrorNum ("IOObjectRelease error with ioHIDDeviceObject.", result);
slouken@1487
   648
*/
slouken@495
   649
slouken@495
   650
		/* Filter device list to non-keyboard/mouse stuff */ 
icculus@623
   651
		if ( (device->usagePage != kHIDPage_GenericDesktop) ||
icculus@623
   652
		     ((device->usage != kHIDUsage_GD_Joystick &&
icculus@3924
   653
		      device->usage != kHIDUsage_GD_GamePad &&
icculus@3924
   654
		      device->usage != kHIDUsage_GD_MultiAxisController)) ) {
icculus@620
   655
slouken@495
   656
			/* release memory for the device */
slouken@495
   657
			HIDDisposeDevice (&device);
slouken@495
   658
			DisposePtr((Ptr)device);
slouken@495
   659
			continue;
slouken@495
   660
		}
slouken@495
   661
		
slouken@172
   662
		/* Add device to the end of the list */
slouken@172
   663
		if (lastDevice)
slouken@172
   664
			lastDevice->pNext = device;
slouken@172
   665
		else
slouken@172
   666
			gpDeviceList = device;
slouken@172
   667
		lastDevice = device;
slouken@172
   668
	}
slouken@172
   669
	result = IOObjectRelease (hidObjectIterator); /* release the iterator */
slouken@172
   670
slouken@172
   671
	/* Count the total number of devices we found */
slouken@172
   672
	device = gpDeviceList;
slouken@172
   673
	while (device)
slouken@172
   674
	{
slouken@172
   675
		SDL_numjoysticks++;
slouken@172
   676
		device = device->pNext;
slouken@172
   677
	}
slouken@172
   678
	
slouken@172
   679
	return SDL_numjoysticks;
slouken@172
   680
}
slouken@172
   681
slouken@172
   682
/* Function to get the device-dependent name of a joystick */
slouken@172
   683
const char *SDL_SYS_JoystickName(int index)
slouken@172
   684
{
slouken@172
   685
	recDevice *device = gpDeviceList;
slouken@172
   686
	
slouken@172
   687
	for (; index > 0; index--)
slouken@172
   688
		device = device->pNext;
slouken@172
   689
slouken@172
   690
	return device->product;
slouken@172
   691
}
slouken@172
   692
slouken@172
   693
/* Function to open a joystick for use.
slouken@172
   694
 * The joystick to open is specified by the index field of the joystick.
slouken@172
   695
 * This should fill the nbuttons and naxes fields of the joystick structure.
slouken@172
   696
 * It returns 0, or -1 if there is an error.
slouken@172
   697
 */
slouken@172
   698
int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
slouken@172
   699
{
slouken@172
   700
	recDevice *device = gpDeviceList;
slouken@172
   701
	int index;
slouken@172
   702
	
slouken@172
   703
	for (index = joystick->index; index > 0; index--)
slouken@172
   704
		device = device->pNext;
slouken@172
   705
slouken@172
   706
	joystick->hwdata = device;
slouken@172
   707
	joystick->name = device->product;
slouken@172
   708
slouken@172
   709
	joystick->naxes = device->axes;
slouken@172
   710
	joystick->nhats = device->hats;
slouken@172
   711
	joystick->nballs = 0;
slouken@172
   712
	joystick->nbuttons = device->buttons;
slouken@172
   713
slouken@172
   714
	return 0;
slouken@172
   715
}
slouken@172
   716
slouken@172
   717
/* Function to update the state of a joystick - called as a device poll.
slouken@172
   718
 * This function shouldn't update the joystick structure directly,
slouken@172
   719
 * but instead should call SDL_PrivateJoystick*() to deliver events
slouken@172
   720
 * and update joystick device state.
slouken@172
   721
 */
slouken@172
   722
void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
slouken@172
   723
{
slouken@172
   724
	recDevice *device = joystick->hwdata;
slouken@172
   725
	recElement *element;
slouken@4120
   726
	SInt32 value, range;
slouken@172
   727
	int i;
slouken@858
   728
slouken@858
   729
	if (device->removed)  /* device was unplugged; ignore it. */
slouken@858
   730
	{
slouken@858
   731
		if (device->uncentered)
slouken@858
   732
		{
slouken@858
   733
			device->uncentered = 0;
slouken@858
   734
slouken@858
   735
			/* Tell the app that everything is centered/unpressed... */
slouken@858
   736
			for (i = 0; i < device->axes; i++)
slouken@858
   737
				SDL_PrivateJoystickAxis(joystick, i, 0);
slouken@858
   738
slouken@858
   739
			for (i = 0; i < device->buttons; i++)
slouken@858
   740
				SDL_PrivateJoystickButton(joystick, i, 0);
slouken@858
   741
slouken@858
   742
			for (i = 0; i < device->hats; i++)
slouken@858
   743
				SDL_PrivateJoystickHat(joystick, i, SDL_HAT_CENTERED);
slouken@858
   744
		}
slouken@858
   745
slouken@858
   746
		return;
slouken@858
   747
	}
slouken@858
   748
slouken@172
   749
	element = device->firstAxis;
slouken@172
   750
	i = 0;
slouken@172
   751
	while (element)
slouken@172
   752
	{
slouken@172
   753
		value = HIDScaledCalibratedValue(device, element, -32768, 32767);
slouken@172
   754
		if ( value != joystick->axes[i] )
slouken@172
   755
			SDL_PrivateJoystickAxis(joystick, i, value);
slouken@172
   756
		element = element->pNext;
slouken@172
   757
		++i;
slouken@172
   758
	}
slouken@172
   759
	
slouken@172
   760
	element = device->firstButton;
slouken@172
   761
	i = 0;
slouken@172
   762
	while (element)
slouken@172
   763
	{
slouken@172
   764
		value = HIDGetElementValue(device, element);
slouken@629
   765
        if (value > 1)  /* handle pressure-sensitive buttons */
slouken@629
   766
            value = 1;
slouken@172
   767
		if ( value != joystick->buttons[i] )
slouken@172
   768
			SDL_PrivateJoystickButton(joystick, i, value);
slouken@172
   769
		element = element->pNext;
slouken@172
   770
		++i;
slouken@172
   771
	}
slouken@629
   772
	    
slouken@172
   773
	element = device->firstHat;
slouken@172
   774
	i = 0;
slouken@172
   775
	while (element)
slouken@172
   776
	{
slouken@210
   777
		Uint8 pos = 0;
slouken@172
   778
slouken@4120
   779
		range = (element->max - element->min + 1);
slouken@4120
   780
		value = HIDGetElementValue(device, element) - element->min;
slouken@4120
   781
		if (range == 4) /* 4 position hatswitch - scale up value */
slouken@617
   782
			value *= 2;
slouken@4120
   783
		else if (range != 8) /* Neither a 4 nor 8 positions - fall back to default position (centered) */
slouken@617
   784
			value = -1;
slouken@172
   785
		switch(value)
slouken@172
   786
		{
slouken@172
   787
			case 0:
slouken@617
   788
				pos = SDL_HAT_UP;
slouken@172
   789
				break;
slouken@172
   790
			case 1:
slouken@617
   791
				pos = SDL_HAT_RIGHTUP;
slouken@172
   792
				break;
slouken@172
   793
			case 2:
slouken@617
   794
				pos = SDL_HAT_RIGHT;
slouken@172
   795
				break;
slouken@172
   796
			case 3:
slouken@617
   797
				pos = SDL_HAT_RIGHTDOWN;
slouken@172
   798
				break;
slouken@172
   799
			case 4:
slouken@617
   800
				pos = SDL_HAT_DOWN;
slouken@172
   801
				break;
slouken@172
   802
			case 5:
slouken@617
   803
				pos = SDL_HAT_LEFTDOWN;
slouken@172
   804
				break;
slouken@172
   805
			case 6:
slouken@617
   806
				pos = SDL_HAT_LEFT;
slouken@172
   807
				break;
slouken@172
   808
			case 7:
slouken@617
   809
				pos = SDL_HAT_LEFTUP;
slouken@172
   810
				break;
slouken@617
   811
			default:
slouken@617
   812
				/* Every other value is mapped to center. We do that because some
slouken@617
   813
				 * joysticks use 8 and some 15 for this value, and apparently
slouken@617
   814
				 * there are even more variants out there - so we try to be generous.
slouken@617
   815
				 */
slouken@617
   816
				pos = SDL_HAT_CENTERED;
slouken@172
   817
				break;
slouken@172
   818
		}
slouken@172
   819
		if ( pos != joystick->hats[i] )
slouken@172
   820
			SDL_PrivateJoystickHat(joystick, i, pos);
slouken@172
   821
		element = element->pNext;
slouken@172
   822
		++i;
slouken@172
   823
	}
slouken@172
   824
	
slouken@172
   825
	return;
slouken@172
   826
}
slouken@172
   827
slouken@172
   828
/* Function to close a joystick after use */
slouken@172
   829
void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
slouken@172
   830
{
slouken@172
   831
	/* Should we do anything here? */
slouken@172
   832
	return;
slouken@172
   833
}
slouken@172
   834
slouken@172
   835
/* Function to perform any system-specific joystick related cleanup */
slouken@172
   836
void SDL_SYS_JoystickQuit(void)
slouken@172
   837
{
slouken@172
   838
	while (NULL != gpDeviceList)
slouken@172
   839
		gpDeviceList = HIDDisposeDevice (&gpDeviceList);
slouken@172
   840
}
slouken@1635
   841
slouken@1635
   842
#endif /* SDL_JOYSTICK_IOKIT */