src/joystick/darwin/SDL_sysjoystick.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 16 Oct 2001 15:01:37 +0000
changeset 208 ab4abaf66814
parent 196 c4c4b221a5e5
child 209 c995b877bc5b
permissions -rw-r--r--
*** empty log message ***
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/*
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	SDL - Simple DirectMedia Layer
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	Copyright (C) 1997, 1998, 1999, 2000, 2001  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@devolution.com
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*/
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/* SDL joystick driver for Darwin / MacOS X, based on the IOKit HID API */
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/* Written 2001 by Max Horn */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <sys/errno.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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#include <Kernel/IOKit/hidsystem/IOHIDUsageTables.h>
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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 "SDL_error.h"
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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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/*
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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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*/
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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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	struct recDevice* 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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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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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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/* similiar to HIDGetElementValue, but auto-calibrates the value before returning it */
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SInt32 HIDCalibratedValue (recDevice *pDevice, recElement *pElement)
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{
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	float deviceScale = pElement->max - pElement->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) + pElement->min;
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}
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/* similiar to HIDCalibratedValue but calibrates to an arbitrary scale instead of the elements default scale */
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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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/* 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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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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	}
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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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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->min = number;
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		pElement->maxReport = pElement->min;
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	refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementMaxKey));
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	if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
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		pElement->max = number;
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		pElement->minReport = pElement->max;
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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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   284
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   285
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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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									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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		}
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		else if (kIOHIDElementTypeCollection == elementType)
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			HIDGetCollectionElements ((CFMutableDictionaryRef) refElement, pDevice);
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	}
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   341
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	if (element && headElement) /* add to list */
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	{
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		pDevice->elements++;
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		if (NULL == *headElement)
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			*headElement = element;
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		else
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		{
slouken@172
   349
			recElement *elementPrevious, *elementCurrent;
slouken@172
   350
			elementCurrent = *headElement;
slouken@172
   351
			while (elementCurrent)
slouken@172
   352
			{
slouken@172
   353
				elementPrevious = elementCurrent;
slouken@172
   354
				elementCurrent = elementPrevious->pNext;
slouken@172
   355
			}
slouken@172
   356
			elementPrevious->pNext = element;
slouken@172
   357
		}
slouken@172
   358
		element->pNext = NULL;
slouken@172
   359
		HIDGetElementInfo (refElement, element);
slouken@172
   360
	}
slouken@172
   361
}
slouken@172
   362
slouken@172
   363
/* collects information from each array member in device element list (each array memeber = element) */
slouken@172
   364
slouken@172
   365
static void HIDGetElementsCFArrayHandler (const void * value, void * parameter)
slouken@172
   366
{
slouken@172
   367
	if (CFGetTypeID (value) == CFDictionaryGetTypeID ())
slouken@172
   368
		HIDAddElement ((CFTypeRef) value, (recDevice *) parameter);
slouken@172
   369
}
slouken@172
   370
slouken@172
   371
/* handles retrieval of element information from arrays of elements in device IO registry information */
slouken@172
   372
slouken@172
   373
static void HIDGetElements (CFTypeRef refElementCurrent, recDevice *pDevice)
slouken@172
   374
{
slouken@172
   375
	CFTypeID type = CFGetTypeID (refElementCurrent);
slouken@172
   376
	if (type == CFArrayGetTypeID()) /* if element is an array */
slouken@172
   377
	{
slouken@172
   378
		CFRange range = {0, CFArrayGetCount (refElementCurrent)};
slouken@172
   379
		/* CountElementsCFArrayHandler called for each array member */
slouken@172
   380
		CFArrayApplyFunction (refElementCurrent, range, HIDGetElementsCFArrayHandler, pDevice);
slouken@172
   381
	}
slouken@172
   382
}			
slouken@172
   383
slouken@172
   384
/* handles extracting element information from element collection CF types
slouken@172
   385
 * used from top level element decoding and hierarchy deconstruction to flatten device element list
slouken@172
   386
 */
slouken@172
   387
slouken@172
   388
static void HIDGetCollectionElements (CFMutableDictionaryRef deviceProperties, recDevice *pDevice)
slouken@172
   389
{
slouken@172
   390
	CFTypeRef refElementTop = CFDictionaryGetValue (deviceProperties, CFSTR(kIOHIDElementKey));
slouken@172
   391
	if (refElementTop)
slouken@172
   392
		HIDGetElements (refElementTop, pDevice);
slouken@172
   393
}
slouken@172
   394
slouken@172
   395
/* use top level element usage page and usage to discern device usage page and usage setting appropriate vlaues in device record */
slouken@172
   396
slouken@172
   397
static void HIDTopLevelElementHandler (const void * value, void * parameter)
slouken@172
   398
{
slouken@172
   399
	CFTypeRef refCF = 0;
slouken@172
   400
	if (CFGetTypeID (value) != CFDictionaryGetTypeID ())
slouken@172
   401
		return;
slouken@172
   402
	refCF = CFDictionaryGetValue (value, CFSTR(kIOHIDElementUsagePageKey));
slouken@172
   403
	if (!CFNumberGetValue (refCF, kCFNumberLongType, &((recDevice *) parameter)->usagePage))
slouken@172
   404
		SDL_SetError ("CFNumberGetValue error retrieving pDevice->usagePage.");
slouken@172
   405
	refCF = CFDictionaryGetValue (value, CFSTR(kIOHIDElementUsageKey));
slouken@172
   406
	if (!CFNumberGetValue (refCF, kCFNumberLongType, &((recDevice *) parameter)->usage))
slouken@172
   407
		SDL_SetError ("CFNumberGetValue error retrieving pDevice->usage.");
slouken@172
   408
}
slouken@172
   409
slouken@172
   410
/* extracts device info from CF dictionary records in IO registry */
slouken@172
   411
slouken@172
   412
static void HIDGetDeviceInfo (io_object_t hidDevice, CFMutableDictionaryRef hidProperties, recDevice *pDevice)
slouken@172
   413
{
slouken@172
   414
	CFMutableDictionaryRef usbProperties = 0;
slouken@172
   415
	io_registry_entry_t parent1, parent2;
slouken@172
   416
	
slouken@172
   417
	/* Mac OS X currently is not mirroring all USB properties to HID page so need to look at USB device page also
slouken@172
   418
	 * get dictionary for usb properties: step up two levels and get CF dictionary for USB properties
slouken@172
   419
	 */
slouken@172
   420
	if ((KERN_SUCCESS == IORegistryEntryGetParentEntry (hidDevice, kIOServicePlane, &parent1)) &&
slouken@172
   421
		(KERN_SUCCESS == IORegistryEntryGetParentEntry (parent1, kIOServicePlane, &parent2)) &&
slouken@172
   422
		(KERN_SUCCESS == IORegistryEntryCreateCFProperties (parent2, &usbProperties, kCFAllocatorDefault, kNilOptions)))
slouken@172
   423
	{
slouken@172
   424
		if (usbProperties)
slouken@172
   425
		{
slouken@172
   426
			CFTypeRef refCF = 0;
slouken@172
   427
			/* get device info
slouken@172
   428
			 * try hid dictionary first, if fail then go to usb dictionary
slouken@172
   429
			 */
slouken@172
   430
			
slouken@172
   431
			
slouken@172
   432
			/* get product name */
slouken@172
   433
			refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDProductKey));
slouken@172
   434
			if (!refCF)
slouken@172
   435
				refCF = CFDictionaryGetValue (usbProperties, CFSTR("USB Product Name"));
slouken@172
   436
			if (refCF)
slouken@172
   437
			{
slouken@172
   438
				if (!CFStringGetCString (refCF, pDevice->product, 256, CFStringGetSystemEncoding ()))
slouken@172
   439
					SDL_SetError ("CFStringGetCString error retrieving pDevice->product.");
slouken@172
   440
			}
slouken@172
   441
			
slouken@172
   442
			/* get usage page and usage */
slouken@172
   443
			refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDPrimaryUsagePageKey));
slouken@172
   444
			if (refCF)
slouken@172
   445
			{
slouken@172
   446
				if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->usagePage))
slouken@172
   447
					SDL_SetError ("CFNumberGetValue error retrieving pDevice->usagePage.");
slouken@172
   448
				refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDPrimaryUsageKey));
slouken@172
   449
				if (refCF)
slouken@172
   450
					if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->usage))
slouken@172
   451
						SDL_SetError ("CFNumberGetValue error retrieving pDevice->usage.");
slouken@172
   452
			}
slouken@172
   453
slouken@172
   454
			if (NULL == refCF) /* get top level element HID usage page or usage */
slouken@172
   455
			{
slouken@172
   456
				/* use top level element instead */
slouken@172
   457
				CFTypeRef refCFTopElement = 0;
slouken@172
   458
				refCFTopElement = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDElementKey));
slouken@172
   459
				{
slouken@172
   460
					/* refCFTopElement points to an array of element dictionaries */
slouken@172
   461
					CFRange range = {0, CFArrayGetCount (refCFTopElement)};
slouken@172
   462
					CFArrayApplyFunction (refCFTopElement, range, HIDTopLevelElementHandler, pDevice);
slouken@172
   463
				}
slouken@172
   464
			}
slouken@172
   465
slouken@172
   466
			CFRelease (usbProperties);
slouken@172
   467
		}
slouken@172
   468
		else
slouken@172
   469
			SDL_SetError ("IORegistryEntryCreateCFProperties failed to create usbProperties.");
slouken@172
   470
slouken@172
   471
		if (kIOReturnSuccess != IOObjectRelease (parent2))
slouken@172
   472
			SDL_SetError ("IOObjectRelease error with parent2.");
slouken@172
   473
		if (kIOReturnSuccess != IOObjectRelease (parent1))
slouken@172
   474
			SDL_SetError ("IOObjectRelease error with parent1.");
slouken@172
   475
	}
slouken@172
   476
}
slouken@172
   477
slouken@172
   478
slouken@172
   479
static recDevice *HIDBuildDevice (io_object_t hidDevice)
slouken@172
   480
{
slouken@172
   481
	recDevice *pDevice = (recDevice *) NewPtrClear (sizeof (recDevice));
slouken@172
   482
	if (pDevice)
slouken@172
   483
	{
slouken@172
   484
		/* get dictionary for HID properties */
slouken@172
   485
		CFMutableDictionaryRef hidProperties = 0;
slouken@172
   486
		kern_return_t result = IORegistryEntryCreateCFProperties (hidDevice, &hidProperties, kCFAllocatorDefault, kNilOptions);
slouken@172
   487
		if ((result == KERN_SUCCESS) && hidProperties)
slouken@172
   488
		{
slouken@172
   489
			/* create device interface */
slouken@172
   490
			result = HIDCreateOpenDeviceInterface (hidDevice, pDevice);
slouken@172
   491
			if (kIOReturnSuccess == result)
slouken@172
   492
			{
slouken@172
   493
				HIDGetDeviceInfo (hidDevice, hidProperties, pDevice); /* hidDevice used to find parents in registry tree */
slouken@172
   494
				HIDGetCollectionElements (hidProperties, pDevice);
slouken@172
   495
			}
slouken@172
   496
			else
slouken@172
   497
			{
slouken@172
   498
				DisposePtr(pDevice);
slouken@172
   499
				pDevice = NULL;
slouken@172
   500
			}
slouken@172
   501
			CFRelease (hidProperties);
slouken@172
   502
		}
slouken@172
   503
		else
slouken@172
   504
		{
slouken@172
   505
			DisposePtr(pDevice);
slouken@172
   506
			pDevice = NULL;
slouken@172
   507
		}
slouken@172
   508
	}
slouken@172
   509
	return pDevice;
slouken@172
   510
}
slouken@172
   511
slouken@172
   512
/* disposes of the element list associated with a device and the memory associated with the list
slouken@172
   513
 */
slouken@172
   514
slouken@172
   515
static void HIDDisposeElementList (recElement **elementList)
slouken@172
   516
{
slouken@172
   517
	recElement *pElement = *elementList;
slouken@172
   518
	while (pElement)
slouken@172
   519
	{
slouken@172
   520
		recElement *pElementNext = pElement->pNext;
slouken@172
   521
		DisposePtr ((Ptr) pElement);
slouken@172
   522
		pElement = pElementNext;
slouken@172
   523
	}
slouken@172
   524
	*elementList = NULL;
slouken@172
   525
}
slouken@172
   526
slouken@172
   527
/* disposes of a single device, closing and releaseing interface, freeing memory fro device and elements, setting device pointer to NULL
slouken@172
   528
 * all your device no longer belong to us... (i.e., you do not 'own' the device anymore)
slouken@172
   529
 */
slouken@172
   530
slouken@172
   531
static recDevice *HIDDisposeDevice (recDevice **ppDevice)
slouken@172
   532
{
slouken@172
   533
	kern_return_t result = KERN_SUCCESS;
slouken@172
   534
	recDevice *pDeviceNext = NULL;
slouken@172
   535
	if (*ppDevice)
slouken@172
   536
	{
slouken@172
   537
		// save next device prior to disposing of this device
slouken@172
   538
		pDeviceNext = (*ppDevice)->pNext;
slouken@172
   539
		
slouken@172
   540
		/* free element lists */
slouken@172
   541
		HIDDisposeElementList (&(*ppDevice)->firstAxis);
slouken@172
   542
		HIDDisposeElementList (&(*ppDevice)->firstButton);
slouken@172
   543
		HIDDisposeElementList (&(*ppDevice)->firstHat);
slouken@172
   544
		
slouken@172
   545
		result = HIDCloseReleaseInterface (*ppDevice); /* function sanity checks interface value (now application does not own device) */
slouken@172
   546
		if (kIOReturnSuccess != result)
slouken@172
   547
			HIDReportErrorNum ("HIDCloseReleaseInterface failed when trying to dipose device.", result);
slouken@172
   548
		DisposePtr ((Ptr)*ppDevice);
slouken@172
   549
		*ppDevice = NULL;
slouken@172
   550
	}
slouken@172
   551
	return pDeviceNext;
slouken@172
   552
}
slouken@172
   553
slouken@172
   554
slouken@172
   555
/* Function to scan the system for joysticks.
slouken@172
   556
 * Joystick 0 should be the system default joystick.
slouken@172
   557
 * This function should return the number of available joysticks, or -1
slouken@172
   558
 * on an unrecoverable fatal error.
slouken@172
   559
 */
slouken@172
   560
int SDL_SYS_JoystickInit(void)
slouken@172
   561
{
slouken@172
   562
	IOReturn result = kIOReturnSuccess;
slouken@172
   563
	mach_port_t masterPort = NULL;
slouken@172
   564
	io_iterator_t hidObjectIterator = NULL;
slouken@172
   565
	CFMutableDictionaryRef hidMatchDictionary = NULL;
slouken@172
   566
	recDevice *device, *lastDevice;
slouken@172
   567
	io_object_t ioHIDDeviceObject = NULL;
slouken@172
   568
	UInt32 usagePage = kHIDPage_GenericDesktop;
slouken@172
   569
	UInt32 usage = kHIDUsage_GD_Joystick; /* We probably also should check for gamepads? */
slouken@172
   570
	
slouken@172
   571
	SDL_numjoysticks = 0;
slouken@172
   572
	
slouken@172
   573
	if (NULL != gpDeviceList)
slouken@172
   574
	{
slouken@172
   575
		SDL_SetError("Joystick: Device list already inited.");
slouken@172
   576
		return -1;
slouken@172
   577
	}
slouken@172
   578
	
slouken@172
   579
	result = IOMasterPort (bootstrap_port, &masterPort);
slouken@172
   580
	if (kIOReturnSuccess != result)
slouken@172
   581
	{
slouken@172
   582
		SDL_SetError("Joystick: IOMasterPort error with bootstrap_port.");
slouken@172
   583
		return -1;
slouken@172
   584
	}
slouken@172
   585
slouken@172
   586
	/* Set up a matching dictionary to search I/O Registry by class name for all HID class devices. */
slouken@172
   587
	hidMatchDictionary = IOServiceMatching (kIOHIDDeviceKey);
slouken@172
   588
	if ((hidMatchDictionary != NULL) && (usagePage) && (usage))
slouken@172
   589
	{
slouken@172
   590
		/* Add key for device type (joystick, in this case) to refine the matching dictionary. */
slouken@172
   591
		CFNumberRef refUsage = NULL, refUsagePage = NULL;
slouken@172
   592
slouken@172
   593
		refUsage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usagePage);
slouken@172
   594
		CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsageKey), refUsage);
slouken@172
   595
		refUsagePage = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &usage);
slouken@172
   596
		CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsagePageKey), refUsagePage);
slouken@172
   597
	}
slouken@172
   598
	else
slouken@172
   599
	{
slouken@172
   600
		SDL_SetError("Joystick: Failed to get HID CFMutableDictionaryRef via IOServiceMatching.");
slouken@172
   601
		return -1;
slouken@172
   602
	}
slouken@172
   603
	
slouken@172
   604
	/*/ Now search I/O Registry for matching devices. */
slouken@172
   605
	result = IOServiceGetMatchingServices (masterPort, hidMatchDictionary, &hidObjectIterator);
slouken@172
   606
	/* Check for errors */
slouken@172
   607
	if ((kIOReturnSuccess != result) || (NULL == hidObjectIterator))
slouken@172
   608
	{
slouken@172
   609
		SDL_SetError("Joystick: Couldn't create a HID object iterator.");
slouken@172
   610
		return -1;
slouken@172
   611
	}
slouken@172
   612
	/* IOServiceGetMatchingServices consumes a reference to the dictionary, so we don't need to release the dictionary ref. */
slouken@172
   613
slouken@172
   614
	/* build flat linked list of devices from device iterator */
slouken@172
   615
slouken@172
   616
	gpDeviceList = lastDevice = NULL;
slouken@172
   617
	
slouken@172
   618
	while ((ioHIDDeviceObject = IOIteratorNext (hidObjectIterator)))
slouken@172
   619
	{
slouken@172
   620
		/* build a device record */
slouken@172
   621
		device = HIDBuildDevice (ioHIDDeviceObject);
slouken@172
   622
		if (!device)
slouken@172
   623
			continue;
slouken@172
   624
slouken@172
   625
		/* dump device object, it is no longer needed */
slouken@172
   626
		result = IOObjectRelease (ioHIDDeviceObject);
slouken@172
   627
//		if (KERN_SUCCESS != result)
slouken@172
   628
//			HIDReportErrorNum ("IOObjectRelease error with ioHIDDeviceObject.", result);
slouken@172
   629
		/* Add device to the end of the list */
slouken@172
   630
		if (lastDevice)
slouken@172
   631
			lastDevice->pNext = device;
slouken@172
   632
		else
slouken@172
   633
			gpDeviceList = device;
slouken@172
   634
		lastDevice = device;
slouken@172
   635
	}
slouken@172
   636
	result = IOObjectRelease (hidObjectIterator); /* release the iterator */
slouken@172
   637
slouken@172
   638
	/* Count the total number of devices we found */
slouken@172
   639
	device = gpDeviceList;
slouken@172
   640
	while (device)
slouken@172
   641
	{
slouken@172
   642
		SDL_numjoysticks++;
slouken@172
   643
		device = device->pNext;
slouken@172
   644
	}
slouken@172
   645
	
slouken@172
   646
	return SDL_numjoysticks;
slouken@172
   647
}
slouken@172
   648
slouken@172
   649
/* Function to get the device-dependent name of a joystick */
slouken@172
   650
const char *SDL_SYS_JoystickName(int index)
slouken@172
   651
{
slouken@172
   652
	recDevice *device = gpDeviceList;
slouken@172
   653
	
slouken@172
   654
	for (; index > 0; index--)
slouken@172
   655
		device = device->pNext;
slouken@172
   656
slouken@172
   657
	return device->product;
slouken@172
   658
}
slouken@172
   659
slouken@172
   660
/* Function to open a joystick for use.
slouken@172
   661
 * The joystick to open is specified by the index field of the joystick.
slouken@172
   662
 * This should fill the nbuttons and naxes fields of the joystick structure.
slouken@172
   663
 * It returns 0, or -1 if there is an error.
slouken@172
   664
 */
slouken@172
   665
int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
slouken@172
   666
{
slouken@172
   667
	recDevice *device = gpDeviceList;
slouken@172
   668
	int index;
slouken@172
   669
	
slouken@172
   670
	for (index = joystick->index; index > 0; index--)
slouken@172
   671
		device = device->pNext;
slouken@172
   672
slouken@172
   673
	joystick->hwdata = device;
slouken@172
   674
	joystick->name = device->product;
slouken@172
   675
slouken@172
   676
	joystick->naxes = device->axes;
slouken@172
   677
	joystick->nhats = device->hats;
slouken@172
   678
	joystick->nballs = 0;
slouken@172
   679
	joystick->nbuttons = device->buttons;
slouken@172
   680
slouken@172
   681
	return 0;
slouken@172
   682
}
slouken@172
   683
slouken@172
   684
/* Function to update the state of a joystick - called as a device poll.
slouken@172
   685
 * This function shouldn't update the joystick structure directly,
slouken@172
   686
 * but instead should call SDL_PrivateJoystick*() to deliver events
slouken@172
   687
 * and update joystick device state.
slouken@172
   688
 */
slouken@172
   689
void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
slouken@172
   690
{
slouken@172
   691
	recDevice *device = joystick->hwdata;
slouken@172
   692
	recElement *element;
slouken@172
   693
	SInt32 value;
slouken@172
   694
	int i;
slouken@172
   695
	
slouken@172
   696
	element = device->firstAxis;
slouken@172
   697
	i = 0;
slouken@172
   698
	while (element)
slouken@172
   699
	{
slouken@172
   700
		value = HIDScaledCalibratedValue(device, element, -32768, 32767);
slouken@172
   701
		if ( value != joystick->axes[i] )
slouken@172
   702
			SDL_PrivateJoystickAxis(joystick, i, value);
slouken@172
   703
		element = element->pNext;
slouken@172
   704
		++i;
slouken@172
   705
	}
slouken@172
   706
	
slouken@172
   707
	element = device->firstButton;
slouken@172
   708
	i = 0;
slouken@172
   709
	while (element)
slouken@172
   710
	{
slouken@172
   711
		value = HIDGetElementValue(device, element);
slouken@172
   712
		if ( value != joystick->buttons[i] )
slouken@172
   713
			SDL_PrivateJoystickButton(joystick, i, value);
slouken@172
   714
		element = element->pNext;
slouken@172
   715
		++i;
slouken@172
   716
	}
slouken@172
   717
	
slouken@172
   718
	element = device->firstHat;
slouken@172
   719
	i = 0;
slouken@172
   720
	while (element)
slouken@172
   721
	{
slouken@172
   722
		Uint8 pos;
slouken@172
   723
slouken@172
   724
		value = HIDGetElementValue(device, element);
slouken@172
   725
		switch(value)
slouken@172
   726
		{
slouken@172
   727
			case 0:
slouken@172
   728
				pos = SDL_HAT_CENTERED;
slouken@172
   729
				break;
slouken@172
   730
			case 1:
slouken@172
   731
				pos = SDL_HAT_UP;
slouken@172
   732
				break;
slouken@172
   733
			case 2:
slouken@172
   734
				pos = SDL_HAT_RIGHTUP;
slouken@172
   735
				break;
slouken@172
   736
			case 3:
slouken@172
   737
				pos = SDL_HAT_RIGHT;
slouken@172
   738
				break;
slouken@172
   739
			case 4:
slouken@172
   740
				pos = SDL_HAT_RIGHTDOWN;
slouken@172
   741
				break;
slouken@172
   742
			case 5:
slouken@172
   743
				pos = SDL_HAT_DOWN;
slouken@172
   744
				break;
slouken@172
   745
			case 6:
slouken@172
   746
				pos = SDL_HAT_LEFTDOWN;
slouken@172
   747
				break;
slouken@172
   748
			case 7:
slouken@172
   749
				pos = SDL_HAT_LEFT;
slouken@172
   750
				break;
slouken@172
   751
			case 8:
slouken@172
   752
				pos = SDL_HAT_LEFTUP;
slouken@172
   753
				break;
slouken@172
   754
		}
slouken@172
   755
		if ( pos != joystick->hats[i] )
slouken@172
   756
			SDL_PrivateJoystickHat(joystick, i, pos);
slouken@172
   757
		element = element->pNext;
slouken@172
   758
		++i;
slouken@172
   759
	}
slouken@172
   760
	
slouken@172
   761
	return;
slouken@172
   762
}
slouken@172
   763
slouken@172
   764
/* Function to close a joystick after use */
slouken@172
   765
void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
slouken@172
   766
{
slouken@172
   767
	/* Should we do anything here? */
slouken@172
   768
	return;
slouken@172
   769
}
slouken@172
   770
slouken@172
   771
/* Function to perform any system-specific joystick related cleanup */
slouken@172
   772
void SDL_SYS_JoystickQuit(void)
slouken@172
   773
{
slouken@172
   774
	while (NULL != gpDeviceList)
slouken@172
   775
		gpDeviceList = HIDDisposeDevice (&gpDeviceList);
slouken@172
   776
}