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tenfourfox/dom/gamepad/cocoa/HID_Utilities.c
Cameron Kaiser c9b2922b70 hello FPR
2017-04-19 00:56:45 -07:00

1670 lines
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/*
* Support for Mac OS X via the HID Utilities example code. HID Utilities
* talks to very low-level parts of the HID Manager API, which are deprecated
* in OS X 10.5. Please see macosx_hidmanager.c for the 10.5 implementation.
*
* Please see the file LICENSE in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#include "manymouse.h"
#if ( (defined(__MACH__)) && (defined(__APPLE__)) )
/*
* This source is almost entirely lifted from Apple's HID Utilities
* example source code, written by George Warner:
*
* http://developer.apple.com/samplecode/HID_Utilities_Source/HID_Utilities_Source.html
*
* The source license to HID Utilities allows this sort of blatant stealing.
*
* Patches to HID Utilities have comments like "ryan added this", otherwise,
* I just tried to cut down that package to the smallest set of functions
* I needed.
*
* Scroll down for "-- END HID UTILITIES --" to see the ManyMouse glue code.
*/
#include <Carbon/Carbon.h>
#include <IOKit/IOTypes.h>
// 10.0.x
//#include <IOKit/IOUSBHIDParser.h>
// 10.1.x
#include <IOKit/hid/IOHIDUsageTables.h>
#include <IOKit/hid/IOHIDLib.h>
#include <IOKit/IOCFPlugIn.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOMessage.h>
#define USE_NOTIFICATIONS 1
#define HIDREPORTERRORNUM(s,n) do {} while (false)
#define HIDREPORTERROR(s) do {} while (false)
typedef enum HIDElementTypeMask
{
kHIDElementTypeInput = 1 << 1,
kHIDElementTypeOutput = 1 << 2,
kHIDElementTypeFeature = 1 << 3,
kHIDElementTypeCollection = 1 << 4,
kHIDElementTypeIO = kHIDElementTypeInput | kHIDElementTypeOutput | kHIDElementTypeFeature,
kHIDElementTypeAll = kHIDElementTypeIO | kHIDElementTypeCollection
}HIDElementTypeMask;
enum
{
kDefaultUserMin = 0, // default user min and max used for scaling
kDefaultUserMax = 255
};
enum
{
kDeviceQueueSize = 50 // this is wired kernel memory so should be set to as small as possible
// but should account for the maximum possible events in the queue
// USB updates will likely occur at 100 Hz so one must account for this rate of
// if states change quickly (updates are only posted on state changes)
};
struct recElement
{
unsigned long type; // the type defined by IOHIDElementType in IOHIDKeys.h
long usagePage; // usage page from IOUSBHIDParser.h which defines general usage
long usage; // usage within above page from IOUSBHIDParser.h which defines specific usage
void * cookie; // unique value (within device of specific vendorID and productID) which identifies element, will NOT change
long min; // reported min value possible
long max; // reported max value possible
long scaledMin; // reported scaled min value possible
long scaledMax; // reported scaled max value possible
long size; // size in bits of data return from element
unsigned char relative; // are reports relative to last report (deltas)
unsigned char wrapping; // does element wrap around (one value higher than max is min)
unsigned char nonLinear; // are the values reported non-linear relative to element movement
unsigned char preferredState; // does element have a preferred state (such as a button)
unsigned char nullState; // does element have null state
long units; // units value is reported in (not used very often)
long unitExp; // exponent for units (also not used very often)
char name[256]; // name of element (c string)
// runtime variables
long calMin; // min returned value
long calMax; // max returned value (calibrate call)
long userMin; // user set value to scale to (scale call)
long userMax;
struct recElement * pPrevious; // previous element (NULL at list head)
struct recElement * pChild; // next child (only of collections)
struct recElement * pSibling; // next sibling (for elements and collections)
long depth;
};
typedef struct recElement recElement;
typedef recElement* pRecElement;
// ryan added this.
typedef enum
{
DISCONNECT_CONNECTED,
DISCONNECT_TELLUSER,
DISCONNECT_COMPLETE
} DisconnectState;
struct recDevice
{
void * interface; // interface to device, NULL = no interface
void * queue; // device queue, NULL = no queue
void * queueRunLoopSource; // device queue run loop source, NULL == no source
void * transaction; // output transaction interface, NULL == no interface
void * notification; // notifications
char transport[256]; // device transport (c string)
long vendorID; // id for device vendor, unique across all devices
long productID; // id for particular product, unique across all of a vendors devices
long version; // version of product
char manufacturer[256]; // name of manufacturer
char product[256]; // name of product
char serial[256]; // serial number of specific product, can be assumed unique across specific product or specific vendor (not used often)
long locID; // long representing location in USB (or other I/O) chain which device is pluged into, can identify specific device on machine
long usage; // usage page from IOUSBHID Parser.h which defines general usage
long usagePage; // usage within above page from IOUSBHID Parser.h which defines specific usage
long totalElements; // number of total elements (should be total of all elements on device including collections) (calculated, not reported by device)
long features; // number of elements of type kIOHIDElementTypeFeature
long inputs; // number of elements of type kIOHIDElementTypeInput_Misc or kIOHIDElementTypeInput_Button or kIOHIDElementTypeInput_Axis or kIOHIDElementTypeInput_ScanCodes
long outputs; // number of elements of type kIOHIDElementTypeOutput
long collections; // number of elements of type kIOHIDElementTypeCollection
long axis; // number of axis (calculated, not reported by device)
long buttons; // number of buttons (calculated, not reported by device)
long hats; // number of hat switches (calculated, not reported by device)
long sliders; // number of sliders (calculated, not reported by device)
long dials; // number of dials (calculated, not reported by device)
long wheels; // number of wheels (calculated, not reported by device)
recElement* pListElements; // head of linked list of elements
DisconnectState disconnect; // (ryan added this.)
AbsoluteTime lastScrollTime; // (ryan added this.)
struct recDevice* pNext; // next device
};
typedef struct recDevice recDevice;
typedef recDevice* pRecDevice;
#if USE_NOTIFICATIONS
static IONotificationPortRef gNotifyPort;
static io_iterator_t gAddedIter;
static CFRunLoopRef gRunLoop;
#endif USE_NOTIFICATIONS
// for element retrieval
static pRecDevice gCurrentGetDevice = NULL;
static Boolean gAddAsChild = false;
static int gDepth = false;
static pRecDevice gpDeviceList = NULL;
static UInt32 gNumDevices = 0;
static Boolean HIDIsValidDevice(const pRecDevice pSearchDevice);
static pRecElement HIDGetFirstDeviceElement (pRecDevice pDevice, HIDElementTypeMask typeMask);
static pRecElement HIDGetNextDeviceElement (pRecElement pElement, HIDElementTypeMask typeMask);
static pRecDevice HIDGetFirstDevice (void);
static pRecDevice HIDGetNextDevice (pRecDevice pDevice);
static void HIDReleaseDeviceList (void);
static unsigned long HIDDequeueDevice (pRecDevice pDevice);
static void hid_GetElements (CFTypeRef refElementCurrent, pRecElement *ppCurrentElement);
static void HIDReportError(const char *err) {}
static void HIDReportErrorNum(const char *err, int num) {}
static void hid_GetCollectionElements (CFMutableDictionaryRef deviceProperties, pRecElement *ppCurrentCollection)
{
CFTypeRef refElementTop = CFDictionaryGetValue (deviceProperties, CFSTR(kIOHIDElementKey));
if (refElementTop)
hid_GetElements (refElementTop, ppCurrentCollection);
else
HIDReportError ("hid_GetCollectionElements: CFDictionaryGetValue error when creating CFTypeRef for kIOHIDElementKey.");
}
// extracts actual specific element information from each element CF dictionary entry
static void hid_GetElementInfo (CFTypeRef refElement, pRecElement pElement)
{
long number;
CFTypeRef refType;
// type, usagePage, usage already stored
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementCookieKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->cookie = (IOHIDElementCookie) number;
else
pElement->cookie = (IOHIDElementCookie) 0;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementMinKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->min = number;
else
pElement->min = 0;
pElement->calMax = pElement->min;
pElement->userMin = kDefaultUserMin;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementMaxKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->max = number;
else
pElement->max = 0;
pElement->calMin = pElement->max;
pElement->userMax = kDefaultUserMax;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementScaledMinKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->scaledMin = number;
else
pElement->scaledMin = 0;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementScaledMaxKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->scaledMax = number;
else
pElement->scaledMax = 0;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementSizeKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->size = number;
else
pElement->size = 0;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsRelativeKey));
if (refType)
pElement->relative = CFBooleanGetValue (refType);
else
pElement->relative = 0;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsWrappingKey));
if (refType)
pElement->wrapping = CFBooleanGetValue (refType);
else
pElement->wrapping = false;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementIsNonLinearKey));
if (refType)
pElement->nonLinear = CFBooleanGetValue (refType);
else
pElement->wrapping = false;
#ifdef kIOHIDElementHasPreferredStateKey
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementHasPreferredStateKey));
#else // Mac OS X 10.0 has spelling error
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementHasPreferedStateKey));
#endif
if (refType)
pElement->preferredState = CFBooleanGetValue (refType);
else
pElement->preferredState = false;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementHasNullStateKey));
if (refType)
pElement->nullState = CFBooleanGetValue (refType);
else
pElement->nullState = false;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementUnitKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->units = number;
else
pElement->units = 0;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementUnitExponentKey));
if (refType && CFNumberGetValue (refType, kCFNumberLongType, &number))
pElement->unitExp = number;
else
pElement->unitExp = 0;
refType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementNameKey));
if (refType)
if (!CFStringGetCString (refType, pElement->name, 256, CFStringGetSystemEncoding ()))
HIDReportError ("CFStringGetCString error retrieving pElement->name.");
#if 0
if (!*pElement->name)
{
// set name from vendor id, product id & usage info look up
if (!HIDGetElementNameFromVendorProductUsage (gCurrentGetDevice->vendorID, gCurrentGetDevice->productID, pElement->usagePage, pElement->usage, pElement->name))
{
// set name from vendor id/product id look up
HIDGetElementNameFromVendorProductCookie (gCurrentGetDevice->vendorID, gCurrentGetDevice->productID, (long) pElement->cookie, pElement->name);
if (!*pElement->name) { // if no name
HIDGetUsageName (pElement->usagePage, pElement->usage, pElement->name);
if (!*pElement->name) // if not usage
sprintf (pElement->name, "Element");
}
}
}
#endif
}
static void hid_AddElement (CFTypeRef refElement, pRecElement * ppElementCurrent)
{
pRecDevice pDevice = gCurrentGetDevice;
pRecElement pElement = NULL;
long elementType, usagePage, usage;
CFTypeRef refElementType = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementTypeKey));
CFTypeRef refUsagePage = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementUsagePageKey));
CFTypeRef refUsage = CFDictionaryGetValue (refElement, CFSTR(kIOHIDElementUsageKey));
if (refElementType)
CFNumberGetValue (refElementType, kCFNumberLongType, &elementType);
if (refUsagePage)
CFNumberGetValue (refUsagePage, kCFNumberLongType, &usagePage);
if (refUsage)
CFNumberGetValue (refUsage, kCFNumberLongType, &usage);
if (NULL == pDevice)
return;
if (elementType)
{
// look at types of interest
if (elementType != kIOHIDElementTypeCollection)
{
if (usagePage && usage) // if valid usage and page
{
switch (usagePage) // only interested in kHIDPage_GenericDesktop and kHIDPage_Button
{
case kHIDPage_GenericDesktop:
{
switch (usage) // look at usage to determine function
{
case kHIDUsage_GD_X:
case kHIDUsage_GD_Y:
case kHIDUsage_GD_Z:
case kHIDUsage_GD_Rx:
case kHIDUsage_GD_Ry:
case kHIDUsage_GD_Rz:
pElement = (pRecElement) malloc (sizeof (recElement));
if (pElement) pDevice->axis++;
break;
case kHIDUsage_GD_Slider:
pElement = (pRecElement) malloc (sizeof (recElement));
if (pElement) pDevice->sliders++;
break;
case kHIDUsage_GD_Dial:
pElement = (pRecElement) malloc (sizeof (recElement));
if (pElement) pDevice->dials++;
break;
case kHIDUsage_GD_Wheel:
pElement = (pRecElement) malloc (sizeof (recElement));
if (pElement) pDevice->wheels++;
break;
case kHIDUsage_GD_Hatswitch:
pElement = (pRecElement) malloc (sizeof (recElement));
if (pElement) pDevice->hats++;
break;
default:
pElement = (pRecElement) malloc (sizeof (recElement));
break;
}
}
break;
case kHIDPage_Button:
pElement = (pRecElement) malloc (sizeof (recElement));
if (pElement) pDevice->buttons++;
break;
default:
// just add a generic element
pElement = (pRecElement) malloc (sizeof (recElement));
break;
}
}
#if 0
else
HIDReportError ("CFNumberGetValue error when getting value for refUsage or refUsagePage.");
#endif 0
}
else // collection
pElement = (pRecElement) malloc (sizeof (recElement));
}
else
HIDReportError ("CFNumberGetValue error when getting value for refElementType.");
if (pElement) // add to list
{
// this code builds a binary tree based on the collection hierarchy of inherent in the device element layout
// it preserves the structure of the lements as collections have children and elements are siblings to each other
// clear record
bzero(pElement,sizeof(recElement));
// get element info
pElement->type = elementType;
pElement->usagePage = usagePage;
pElement->usage = usage;
pElement->depth = 0; // assume root object
hid_GetElementInfo (refElement, pElement);
// count elements
pDevice->totalElements++;
switch (pElement->type)
{
case kIOHIDElementTypeInput_Misc:
case kIOHIDElementTypeInput_Button:
case kIOHIDElementTypeInput_Axis:
case kIOHIDElementTypeInput_ScanCodes:
pDevice->inputs++;
break;
case kIOHIDElementTypeOutput:
pDevice->outputs++;
break;
case kIOHIDElementTypeFeature:
pDevice->features++;
break;
case kIOHIDElementTypeCollection:
pDevice->collections++;
break;
default:
HIDReportErrorNum ("Unknown element type : ", pElement->type);
}
if (NULL == *ppElementCurrent) // if at list head
{
pDevice->pListElements = pElement; // add current element
*ppElementCurrent = pElement; // set current element to element we just added
}
else // have exsiting structure
{
if (gAddAsChild) // if the previous element was a collection, let's add this as a child of the previous
{
// this iteration should not be needed but there maybe some untested degenerate case which this code will ensure works
while ((*ppElementCurrent)->pChild) // step down tree until free child node found
*ppElementCurrent = (*ppElementCurrent)->pChild;
(*ppElementCurrent)->pChild = pElement; // insert there
pElement->depth = (*ppElementCurrent)->depth + 1;
}
else // add as sibling
{
// this iteration should not be needed but there maybe some untested degenerate case which this code will ensure works
while ((*ppElementCurrent)->pSibling) // step down tree until free sibling node found
*ppElementCurrent = (*ppElementCurrent)->pSibling;
(*ppElementCurrent)->pSibling = pElement; // insert there
pElement->depth = (*ppElementCurrent)->depth;
}
pElement->pPrevious = *ppElementCurrent; // point to previous
*ppElementCurrent = pElement; // set current to our collection
}
if (elementType == kIOHIDElementTypeCollection) // if this element is a collection of other elements
{
gAddAsChild = true; // add next set as children to this element
gDepth++;
hid_GetCollectionElements ((CFMutableDictionaryRef) refElement, &pElement); // recursively process the collection
gDepth--;
}
gAddAsChild = false; // add next as this elements sibling (when return from a collection or with non-collections)
}
#if 0
else
HIDReportError ("hid_AddElement - no element added.");
#endif
}
static void hid_GetElementsCFArrayHandler (const void * value, void * parameter)
{
if (CFGetTypeID (value) == CFDictionaryGetTypeID ())
hid_AddElement ((CFTypeRef) value, (pRecElement *) parameter);
}
// ---------------------------------
// handles retrieval of element information from arrays of elements in device IO registry information
static void hid_GetElements (CFTypeRef refElementCurrent, pRecElement *ppCurrentElement)
{
CFTypeID type = CFGetTypeID (refElementCurrent);
if (type == CFArrayGetTypeID()) // if element is an array
{
CFRange range = {0, CFArrayGetCount (refElementCurrent)};
// CountElementsCFArrayHandler called for each array member
CFArrayApplyFunction (refElementCurrent, range, hid_GetElementsCFArrayHandler, ppCurrentElement);
}
}
static void hid_TopLevelElementHandler (const void * value, void * parameter)
{
CFTypeRef refCF = 0;
if ((NULL == value) || (NULL == parameter))
return; // (kIOReturnBadArgument)
if (CFGetTypeID (value) != CFDictionaryGetTypeID ())
return; // (kIOReturnBadArgument)
refCF = CFDictionaryGetValue (value, CFSTR(kIOHIDElementUsagePageKey));
if (!CFNumberGetValue (refCF, kCFNumberLongType, &((pRecDevice) parameter)->usagePage))
HIDReportError ("CFNumberGetValue error retrieving pDevice->usagePage.");
refCF = CFDictionaryGetValue (value, CFSTR(kIOHIDElementUsageKey));
if (!CFNumberGetValue (refCF, kCFNumberLongType, &((pRecDevice) parameter)->usage))
HIDReportError ("CFNumberGetValue error retrieving pDevice->usage.");
}
static void hid_GetDeviceInfo (io_object_t hidDevice, CFMutableDictionaryRef hidProperties, pRecDevice pDevice)
{
CFMutableDictionaryRef usbProperties = 0;
io_registry_entry_t parent1, parent2;
// Mac OS X currently is not mirroring all USB properties to HID page so need to look at USB device page also
// get dictionary for usb properties: step up two levels and get CF dictionary for USB properties
if ((KERN_SUCCESS == IORegistryEntryGetParentEntry (hidDevice, kIOServicePlane, &parent1)) &&
(KERN_SUCCESS == IORegistryEntryGetParentEntry (parent1, kIOServicePlane, &parent2)) &&
(KERN_SUCCESS == IORegistryEntryCreateCFProperties (parent2, &usbProperties, kCFAllocatorDefault, kNilOptions)))
{
if (usbProperties)
{
CFTypeRef refCF = 0;
// get device info
// try hid dictionary first, if fail then go to usb dictionary
// get transport
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDTransportKey));
if (refCF)
{
if (!CFStringGetCString (refCF, pDevice->transport, 256, CFStringGetSystemEncoding ()))
HIDReportError ("CFStringGetCString error retrieving pDevice->transport.");
}
// get vendorID
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDVendorIDKey));
if (!refCF)
refCF = CFDictionaryGetValue (usbProperties, CFSTR("idVendor"));
if (refCF)
{
if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->vendorID))
HIDReportError ("CFNumberGetValue error retrieving pDevice->vendorID.");
}
// get product ID
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDProductIDKey));
if (!refCF)
refCF = CFDictionaryGetValue (usbProperties, CFSTR("idProduct"));
if (refCF)
{
if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->productID))
HIDReportError ("CFNumberGetValue error retrieving pDevice->productID.");
}
// get product version
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDVersionNumberKey));
if (refCF)
{
if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->version))
HIDReportError ("CFNumberGetValue error retrieving pDevice->version.");
}
// get manufacturer name
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDManufacturerKey));
if (!refCF)
refCF = CFDictionaryGetValue (usbProperties, CFSTR("USB Vendor Name"));
if (refCF)
{
if (!CFStringGetCString (refCF, pDevice->manufacturer, 256, CFStringGetSystemEncoding ()))
HIDReportError ("CFStringGetCString error retrieving pDevice->manufacturer.");
}
// get product name
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDProductKey));
if (!refCF)
refCF = CFDictionaryGetValue (usbProperties, CFSTR("USB Product Name"));
if (refCF)
{
if (!CFStringGetCString (refCF, pDevice->product, 256, CFStringGetSystemEncoding ()))
HIDReportError ("CFStringGetCString error retrieving pDevice->product.");
}
// get serial
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDSerialNumberKey));
if (refCF)
{
if (!CFStringGetCString (refCF, pDevice->serial, 256, CFStringGetSystemEncoding ()))
HIDReportError ("CFStringGetCString error retrieving pDevice->serial.");
}
// get location ID
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDLocationIDKey));
if (!refCF)
refCF = CFDictionaryGetValue (usbProperties, CFSTR("locationID"));
if (refCF)
{
if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->locID))
HIDReportError ("CFNumberGetValue error retrieving pDevice->locID.");
}
// get usage page and usage
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDPrimaryUsagePageKey));
if (refCF)
{
if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->usagePage))
HIDReportError ("CFNumberGetValue error retrieving pDevice->usagePage.");
refCF = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDPrimaryUsageKey));
if (refCF)
if (!CFNumberGetValue (refCF, kCFNumberLongType, &pDevice->usage))
HIDReportError ("CFNumberGetValue error retrieving pDevice->usage.");
}
if (NULL == refCF) // get top level element HID usage page or usage
{
// use top level element instead
CFTypeRef refCFTopElement = 0;
refCFTopElement = CFDictionaryGetValue (hidProperties, CFSTR(kIOHIDElementKey));
{
// refCFTopElement points to an array of element dictionaries
CFRange range = {0, CFArrayGetCount (refCFTopElement)};
CFArrayApplyFunction (refCFTopElement, range, hid_TopLevelElementHandler, NULL);
}
}
}
else
HIDReportError ("IORegistryEntryCreateCFProperties failed to create usbProperties.");
CFRelease (usbProperties);
if (kIOReturnSuccess != IOObjectRelease (parent2))
HIDReportError ("IOObjectRelease error with parent2.");
if (kIOReturnSuccess != IOObjectRelease (parent1))
HIDReportError ("IOObjectRelease error with parent1.");
}
}
static Boolean hid_MatchElementTypeMask (IOHIDElementType type, HIDElementTypeMask typeMask)
{
if (typeMask & kHIDElementTypeInput)
if ((type == kIOHIDElementTypeInput_Misc) || (type == kIOHIDElementTypeInput_Button) || (type == kIOHIDElementTypeInput_Axis) || (type == kIOHIDElementTypeInput_ScanCodes))
return true;
if (typeMask & kHIDElementTypeOutput)
if (type == kIOHIDElementTypeOutput)
return true;
if (typeMask & kHIDElementTypeFeature)
if (type == kIOHIDElementTypeFeature)
return true;
if (typeMask & kHIDElementTypeCollection)
if (type == kIOHIDElementTypeCollection)
return true;
return false;
}
static pRecElement hid_GetDeviceElement (pRecElement pElement, HIDElementTypeMask typeMask)
{
// we are asking for this element
if (NULL != pElement)
{
if (hid_MatchElementTypeMask (pElement->type, typeMask)) // if the type match what we are looking for
return pElement; // return the element
else
return HIDGetNextDeviceElement (pElement, typeMask); // else get the next one
}
return NULL;
}
static unsigned long HIDCloseReleaseInterface (pRecDevice pDevice)
{
IOReturn result = kIOReturnSuccess;
if (HIDIsValidDevice(pDevice) && (NULL != pDevice->interface))
{
// close the interface
result = (*(IOHIDDeviceInterface**) pDevice->interface)->close (pDevice->interface);
if (kIOReturnNotOpen == result)
{
// do nothing as device was not opened, thus can't be closed
}
else if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("HIDCloseReleaseInterface - Failed to close IOHIDDeviceInterface.", result);
//release the interface
result = (*(IOHIDDeviceInterface**) pDevice->interface)->Release (pDevice->interface);
if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("HIDCloseReleaseInterface - Failed to release interface.", result);
pDevice->interface = NULL;
}
return result;
}
// ---------------------------------
// count number of devices in global device list (gpDeviceList)
static UInt32 hid_CountCurrentDevices (void)
{
pRecDevice pDevice = gpDeviceList;
UInt32 devices = 0;
while (pDevice)
{
devices++;
pDevice = pDevice->pNext;
}
return devices;
}
static UInt32 HIDCountDevices (void)
{
gNumDevices = hid_CountCurrentDevices ();
return gNumDevices;
}
static void hid_DisposeDeviceElements (pRecElement pElement)
{
if (pElement)
{
if (pElement->pChild)
hid_DisposeDeviceElements (pElement->pChild);
if (pElement->pSibling)
hid_DisposeDeviceElements (pElement->pSibling);
free (pElement);
}
}
static pRecDevice hid_DisposeDevice (pRecDevice pDevice)
{
kern_return_t result = KERN_SUCCESS;
pRecDevice pDeviceNext = NULL;
if (HIDIsValidDevice(pDevice))
{
// save next device prior to disposing of this device
pDeviceNext = pDevice->pNext;
result = HIDDequeueDevice (pDevice);
#if 0
if (kIOReturnSuccess != result)
HIDReportErrorNum ("hid_DisposeDevice: HIDDequeueDevice error: 0x%8.8X.", result);
#endif 1
hid_DisposeDeviceElements (pDevice->pListElements);
pDevice->pListElements = NULL;
result = HIDCloseReleaseInterface (pDevice); // function sanity checks interface value (now application does not own device)
if (kIOReturnSuccess != result)
HIDReportErrorNum ("hid_DisposeDevice: HIDCloseReleaseInterface error: 0x%8.8X.", result);
#if USE_NOTIFICATIONS
if (pDevice->interface)
{
// replace (*pDevice->interface)->Release(pDevice->interface);
result = IODestroyPlugInInterface (pDevice->interface);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("hid_DisposeDevice: IODestroyPlugInInterface error: 0x%8.8X.", result);
}
if (pDevice->notification)
{
result = IOObjectRelease((io_object_t) pDevice->notification);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("hid_DisposeDevice: IOObjectRelease error: 0x%8.8X.", result);
}
#endif USE_NOTIFICATIONS
// remove this device from the device list
if (gpDeviceList == pDevice) // head of list?
gpDeviceList = pDeviceNext;
else
{
pRecDevice pDeviceTemp = pDeviceNext = gpDeviceList; // we're going to return this if we don't find ourselfs in the list
while (pDeviceTemp)
{
if (pDeviceTemp->pNext == pDevice) // found us!
{
// take us out of linked list
pDeviceTemp->pNext = pDeviceNext = pDevice->pNext;
break;
}
pDeviceTemp = pDeviceTemp->pNext;
}
}
free (pDevice);
}
// update device count
gNumDevices = hid_CountCurrentDevices ();
return pDeviceNext;
}
// ---------------------------------
// disposes and releases queue, sets queue to NULL,.
// Note: will have no effect if device or queue do not exist
static IOReturn hid_DisposeReleaseQueue (pRecDevice pDevice)
{
IOReturn result = kIOReturnError; // assume failure (pessimist!)
if (HIDIsValidDevice(pDevice)) // need valid device
{
if (pDevice->queue) // and queue
{
// stop queue
result = (*(IOHIDQueueInterface**) pDevice->queue)->stop (pDevice->queue);
if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("hid_DisposeReleaseQueue - Failed to stop queue.", result);
// dispose of queue
result = (*(IOHIDQueueInterface**) pDevice->queue)->dispose (pDevice->queue);
if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("hid_DisposeReleaseQueue - Failed to dipose queue.", result);
// release the queue
result = (*(IOHIDQueueInterface**) pDevice->queue)->Release (pDevice->queue);
if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("hid_DisposeReleaseQueue - Failed to release queue.", result);
pDevice->queue = NULL;
}
else
HIDREPORTERROR ("hid_DisposeReleaseQueue - no queue.");
}
else
HIDREPORTERROR ("hid_DisposeReleaseQueue - Invalid device.");
return result;
}
// ---------------------------------
// completely removes all elements from queue and releases queue and closes device interface
// does not release device interfaces, application must call HIDReleaseDeviceList on exit
static unsigned long HIDDequeueDevice (pRecDevice pDevice)
{
IOReturn result = kIOReturnSuccess;
if (HIDIsValidDevice(pDevice))
{
if ((pDevice->interface) && (pDevice->queue))
{
// iterate through elements and if queued, remove
pRecElement pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeIO);
while (pElement)
{
if ((*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie))
{
result = (*(IOHIDQueueInterface**) pDevice->queue)->removeElement (pDevice->queue, pElement->cookie);
if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("HIDDequeueDevice - Failed to remove element from queue.", result);
}
pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
}
}
// ensure queue is disposed and released
// interface will be closed and released on call to HIDReleaseDeviceList
result = hid_DisposeReleaseQueue (pDevice);
if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("removeElement - Failed to dispose and release queue.", result);
#if USE_ASYNC_EVENTS
else if (NULL != pDevice->queueRunLoopSource)
{
if (CFRunLoopContainsSource(CFRunLoopGetCurrent(), pDevice->queueRunLoopSource, kCFRunLoopDefaultMode))
CFRunLoopRemoveSource(CFRunLoopGetCurrent(), pDevice->queueRunLoopSource, kCFRunLoopDefaultMode);
CFRelease(pDevice->queueRunLoopSource);
pDevice->queueRunLoopSource = NULL;
}
#endif USE_ASYNC_EVENTS
}
else
{
HIDREPORTERROR ("HIDDequeueDevice - Invalid device.");
result = kIOReturnBadArgument;
}
return result;
}
// ---------------------------------
// releases all device queues for quit or rebuild (must be called)
// does not release device interfaces, application must call HIDReleaseDeviceList on exit
static unsigned long HIDReleaseAllDeviceQueues (void)
{
IOReturn result = kIOReturnBadArgument;
pRecDevice pDevice = HIDGetFirstDevice ();
while (pDevice)
{
result = HIDDequeueDevice (pDevice);
if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("HIDReleaseAllDeviceQueues - Could not dequeue device.", result);
pDevice = HIDGetNextDevice (pDevice);
}
return result;
}
// ---------------------------------
// Get the next event in the queue for a device
// elements or entire device should be queued prior to calling this with HIDQueueElement or HIDQueueDevice
// returns true if an event is avialable for the element and fills out *pHIDEvent structure, returns false otherwise
// Note: kIOReturnUnderrun returned from getNextEvent indicates an empty queue not an error condition
// Note: application should pass in a pointer to a IOHIDEventStruct cast to a void (for CFM compatibility)
static unsigned char HIDGetEvent (pRecDevice pDevice, void * pHIDEvent)
{
IOReturn result = kIOReturnBadArgument;
AbsoluteTime zeroTime = {0,0};
if (HIDIsValidDevice(pDevice))
{
if (pDevice->queue)
{
result = (*(IOHIDQueueInterface**) pDevice->queue)->getNextEvent (pDevice->queue, (IOHIDEventStruct *)pHIDEvent, zeroTime, 0);
if (kIOReturnUnderrun == result)
return false; // no events in queue not an error per say
else if (kIOReturnSuccess != result) // actual error versus just an empty queue
HIDREPORTERRORNUM ("HIDGetEvent - Could not get HID event via getNextEvent.", result);
else
return true;
}
else
HIDREPORTERROR ("HIDGetEvent - queue does not exist.");
}
else
HIDREPORTERROR ("HIDGetEvent - invalid device.");
return false; // did not get event
}
static unsigned long HIDCreateOpenDeviceInterface (UInt32 hidDevice, pRecDevice pDevice)
{
IOReturn result = kIOReturnSuccess;
HRESULT plugInResult = S_OK;
SInt32 score = 0;
IOCFPlugInInterface ** ppPlugInInterface = NULL;
if (NULL == pDevice->interface)
{
result = IOCreatePlugInInterfaceForService (hidDevice, kIOHIDDeviceUserClientTypeID,
kIOCFPlugInInterfaceID, &ppPlugInInterface, &score);
if (kIOReturnSuccess == result)
{
// Call a method of the intermediate plug-in to create the device interface
plugInResult = (*ppPlugInInterface)->QueryInterface (ppPlugInInterface,
CFUUIDGetUUIDBytes (kIOHIDDeviceInterfaceID), (void *) &(pDevice->interface));
if (S_OK != plugInResult)
HIDReportErrorNum ("Couldn<EFBFBD>t query HID class device interface from plugInInterface", plugInResult);
IODestroyPlugInInterface (ppPlugInInterface); // replace (*ppPlugInInterface)->Release (ppPlugInInterface)
}
else
HIDReportErrorNum ("Failed to create **plugInInterface via IOCreatePlugInInterfaceForService.", result);
}
if (NULL != pDevice->interface)
{
result = (*(IOHIDDeviceInterface**)pDevice->interface)->open (pDevice->interface, 0);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("Failed to open pDevice->interface via open.", result);
}
return result;
}
// ---------------------------------
// adds device to linked list of devices passed in (handles NULL lists properly)
// (returns where you just stored it)
static pRecDevice* hid_AddDevice (pRecDevice *ppListDeviceHead, pRecDevice pNewDevice)
{
pRecDevice* result = NULL;
if (NULL == *ppListDeviceHead)
result = ppListDeviceHead;
else
{
pRecDevice pDevicePrevious = NULL, pDevice = *ppListDeviceHead;
while (pDevice)
{
pDevicePrevious = pDevice;
pDevice = pDevicePrevious->pNext;
}
result = &pDevicePrevious->pNext;
}
pNewDevice->pNext = NULL;
*result = pNewDevice;
return result;
}
static pRecDevice hid_BuildDevice (io_object_t hidDevice)
{
pRecDevice pDevice = (pRecDevice) malloc (sizeof (recDevice));
if (NULL != pDevice)
{
// get dictionary for HID properties
CFMutableDictionaryRef hidProperties = 0;
kern_return_t result = IORegistryEntryCreateCFProperties (hidDevice, &hidProperties, kCFAllocatorDefault, kNilOptions);
// clear record
bzero(pDevice, sizeof(recDevice));
if ((result == KERN_SUCCESS) && (NULL != hidProperties))
{
pRecElement pCurrentElement = NULL;
// create device interface
result = HIDCreateOpenDeviceInterface (hidDevice, pDevice);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("HIDCreateOpenDeviceInterface failed.", result);
hid_GetDeviceInfo (hidDevice, hidProperties, pDevice); // hidDevice used to find parents in registry tree
// set current device for use in getting elements
gCurrentGetDevice = pDevice;
// Add all elements
hid_GetCollectionElements (hidProperties, &pCurrentElement);
gCurrentGetDevice = NULL;
CFRelease (hidProperties);
}
else
HIDReportErrorNum ("IORegistryEntryCreateCFProperties error when creating deviceProperties.", result);
}
else
HIDReportError ("malloc error when allocating pRecDevice.");
return pDevice;
}
#if USE_NOTIFICATIONS
//================================================================================================
//
// hid_DeviceNotification
//
// This routine will get called whenever any kIOGeneralInterest notification happens. We are
// interested in the kIOMessageServiceIsTerminated message so that's what we look for. Other
// messages are defined in IOMessage.h.
//
//================================================================================================
//
static void hid_DeviceNotification( void *refCon,
io_service_t service,
natural_t messageType,
void *messageArgument )
{
pRecDevice pDevice = (pRecDevice) refCon;
if (messageType == kIOMessageServiceIsTerminated)
{
//printf("Device 0x%08x \"%s\"removed.\n", service, pDevice->product);
// ryan added this.
if (pDevice->disconnect == DISCONNECT_CONNECTED)
pDevice->disconnect = DISCONNECT_TELLUSER;
// Free the data we're no longer using now that the device is going away
// ryan commented this out.
//hid_DisposeDevice (pDevice);
}
}
#else
static void hid_RemovalCallbackFunction(void * target, IOReturn result, void * refcon, void * sender)
{
// ryan commented this out.
//hid_DisposeDevice ((pRecDevice) target);
// ryan added this.
pRecDevice = (pRecDevice) target;
if (pDevice->disconnect == DISCONNECT_CONNECTED)
pDevice->disconnect = DISCONNECT_TELLUSER;
}
#endif USE_NOTIFICATIONS
static void hid_AddDevices (void *refCon, io_iterator_t iterator)
{
// NOTE: refcon passed in is used to point to the device list head
pRecDevice* pListDeviceHead = (pRecDevice*) refCon;
IOReturn result = kIOReturnSuccess;
io_object_t ioHIDDeviceObject = 0;
while ((ioHIDDeviceObject = IOIteratorNext (iterator)) != 0)
{
pRecDevice* pNewDeviceAt = NULL;
pRecDevice pNewDevice = hid_BuildDevice (ioHIDDeviceObject);
if (pNewDevice)
{
#if 0 // set true for verbose output
printf("\nhid_AddDevices: pNewDevice = {t: \"%s\", v: %ld, p: %ld, v: %ld, m: \"%s\", " \
"p: \"%s\", l: %ld, u: %4.4lX:%4.4lX, #e: %ld, #f: %ld, #i: %ld, #o: %ld, " \
"#c: %ld, #a: %ld, #b: %ld, #h: %ld, #s: %ld, #d: %ld, #w: %ld}.",
pNewDevice->transport,
pNewDevice->vendorID,
pNewDevice->productID,
pNewDevice->version,
pNewDevice->manufacturer,
pNewDevice->product,
pNewDevice->locID,
pNewDevice->usagePage,
pNewDevice->usage,
pNewDevice->totalElements,
pNewDevice->features,
pNewDevice->inputs,
pNewDevice->outputs,
pNewDevice->collections,
pNewDevice->axis,
pNewDevice->buttons,
pNewDevice->hats,
pNewDevice->sliders,
pNewDevice->dials,
pNewDevice->wheels
);
fflush(stdout);
#elif 0 // otherwise output brief description
printf("\nhid_AddDevices: pNewDevice = {m: \"%s\" p: \"%s\", vid: %ld, pid: %ld, loc: %8.8lX, usage: %4.4lX:%4.4lX}.",
pNewDevice->manufacturer,
pNewDevice->product,
pNewDevice->vendorID,
pNewDevice->productID,
pNewDevice->locID,
pNewDevice->usagePage,
pNewDevice->usage
);
fflush(stdout);
#endif
pNewDeviceAt = hid_AddDevice (pListDeviceHead, pNewDevice);
}
#if USE_NOTIFICATIONS
// Register for an interest notification of this device being removed. Use a reference to our
// private data as the refCon which will be passed to the notification callback.
result = IOServiceAddInterestNotification( gNotifyPort, // notifyPort
ioHIDDeviceObject, // service
kIOGeneralInterest, // interestType
hid_DeviceNotification, // callback
pNewDevice, // refCon
(io_object_t*) &pNewDevice->notification); // notification
if (KERN_SUCCESS != result)
HIDReportErrorNum ("hid_AddDevices: IOServiceAddInterestNotification error: x0%8.8lX.", result);
#else
result = (*(IOHIDDeviceInterface**)pNewDevice->interface)->setRemovalCallback (pNewDevice->interface, hid_RemovalCallbackFunction,pNewDeviceAt,0);
#endif USE_NOTIFICATIONS
// release the device object, it is no longer needed
result = IOObjectRelease (ioHIDDeviceObject);
if (KERN_SUCCESS != result)
HIDReportErrorNum ("hid_AddDevices: IOObjectRelease error with ioHIDDeviceObject.", result);
}
}
static Boolean HIDBuildDeviceList (UInt32 usagePage, UInt32 usage)
{
IOReturn result = kIOReturnSuccess;
mach_port_t masterPort = 0;
if (NULL != gpDeviceList)
HIDReleaseDeviceList ();
result = IOMasterPort (bootstrap_port, &masterPort);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("IOMasterPort error with bootstrap_port.", result);
else
{
CFMutableDictionaryRef hidMatchDictionary = NULL;
// Set up matching dictionary to search the I/O Registry for HID devices we are interested in. Dictionary reference is NULL if error.
{
CFNumberRef refUsage = NULL, refUsagePage = NULL;
// Set up a matching dictionary to search I/O Registry by class name for all HID class devices.
hidMatchDictionary = IOServiceMatching (kIOHIDDeviceKey);
if (NULL != hidMatchDictionary)
{
if (usagePage)
{
// Add key for device type (joystick, in this case) to refine the matching dictionary.
refUsagePage = CFNumberCreate (kCFAllocatorDefault, kCFNumberLongType, &usagePage);
CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsagePageKey), refUsagePage);
CFRelease (refUsagePage);
if (usage)
{
refUsage = CFNumberCreate (kCFAllocatorDefault, kCFNumberLongType, &usage);
CFDictionarySetValue (hidMatchDictionary, CFSTR (kIOHIDPrimaryUsageKey), refUsage);
CFRelease (refUsage);
}
}
CFRetain(hidMatchDictionary);
}
else
HIDReportError ("Failed to get HID CFMutableDictionaryRef via IOServiceMatching.");
}
#if USE_NOTIFICATIONS
// Create a notification port and add its run loop event source to our run loop
// This is how async notifications get set up.
{
CFRunLoopSourceRef runLoopSource;
gNotifyPort = IONotificationPortCreate(masterPort);
runLoopSource = IONotificationPortGetRunLoopSource(gNotifyPort);
gRunLoop = CFRunLoopGetCurrent();
CFRunLoopAddSource(gRunLoop, runLoopSource, kCFRunLoopDefaultMode);
// Now set up a notification to be called when a device is first matched by I/O Kit.
result = IOServiceAddMatchingNotification(gNotifyPort, // notifyPort
kIOFirstMatchNotification, // notificationType
hidMatchDictionary, // matching
hid_AddDevices, // callback
&gpDeviceList, // refCon
&gAddedIter // notification
);
// call it now to add all existing devices
hid_AddDevices(&gpDeviceList,gAddedIter);
return true;
}
#else
{
io_iterator_t hidObjectIterator = NULL;
// Now search I/O Registry for matching devices.
result = IOServiceGetMatchingServices (masterPort, hidMatchDictionary, &hidObjectIterator);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("Failed to create IO object iterator, error:", result);
else if (NULL == hidObjectIterator) // likely no HID devices which matched selection criteria are connected
HIDReportError ("Warning: Could not find any matching devices, thus iterator creation failed.");
if (NULL != hidObjectIterator)
{
hid_AddDevices(&gpDeviceList,hidObjectIterator);
result = IOObjectRelease (hidObjectIterator); // release the iterator
if (kIOReturnSuccess != result)
HIDReportErrorNum ("IOObjectRelease error with hidObjectIterator.", result);
gNumDevices = hid_CountCurrentDevices ();
return true;
}
}
#endif USE_NOTIFICATIONS
// IOServiceGetMatchingServices consumes a reference to the dictionary, so we don't need to release the dictionary ref.
hidMatchDictionary = NULL;
}
return false;
}
// ---------------------------------
// release list built by above function
// MUST be called prior to application exit to properly release devices
// if not called (or app crashes) devices can be recovered by pluging into different location in USB chain
static void HIDReleaseDeviceList (void)
{
while (NULL != gpDeviceList)
gpDeviceList = hid_DisposeDevice (gpDeviceList); // dispose current device return next device will set gpDeviceList to NULL
gNumDevices = 0;
}
// ---------------------------------
// get the first device in the device list
// returns NULL if no list exists
static pRecDevice HIDGetFirstDevice (void)
{
return gpDeviceList;
}
// ---------------------------------
// get next device in list given current device as parameter
// returns NULL if end of list
static pRecDevice HIDGetNextDevice (pRecDevice pDevice)
{
if (NULL != pDevice)
return pDevice->pNext;
else
return NULL;
}
// ---------------------------------
// get the first element of device passed in as parameter
// returns NULL if no list exists or device does not exists or is NULL
static pRecElement HIDGetFirstDeviceElement (pRecDevice pDevice, HIDElementTypeMask typeMask)
{
if (HIDIsValidDevice(pDevice))
{
if (hid_MatchElementTypeMask (pDevice->pListElements->type, typeMask)) // ensure first type matches
return pDevice->pListElements;
else
return HIDGetNextDeviceElement (pDevice->pListElements, typeMask);
}
else
return NULL;
}
// ---------------------------------
// get next element of given device in list given current element as parameter
// will walk down each collection then to next element or collection (depthwise traverse)
// returns NULL if end of list
// uses mask of HIDElementTypeMask to restrict element found
// use kHIDElementTypeIO to get previous HIDGetNextDeviceElement functionality
static pRecElement HIDGetNextDeviceElement (pRecElement pElement, HIDElementTypeMask typeMask)
{
// should only have elements passed in (though someone could mix calls and pass us a collection)
// collection means return the next child or sibling (in that order)
// element means returnt he next sibling (as elements can't have children
if (NULL != pElement)
{
if (pElement->pChild)
{
if (pElement->type != kIOHIDElementTypeCollection)
HIDReportError ("Malformed element list: found child of element.");
else
return hid_GetDeviceElement (pElement->pChild, typeMask); // return the child of this element
}
else if (pElement->pSibling)
{
return hid_GetDeviceElement (pElement->pSibling, typeMask); //return the sibling of this element
}
else // at end back up correctly
{
pRecElement pPreviousElement = NULL;
// malformed device ending in collection
if (pElement->type == kIOHIDElementTypeCollection)
HIDReportError ("Malformed device: found collection at end of element chain.");
// walk back up tree to element prior to first collection ecountered and take next element
while (NULL != pElement->pPrevious)
{
pPreviousElement = pElement;
pElement = pElement->pPrevious; // look at previous element
// if we have a collection and the previous element is the branch element (should have both a colection and next element attached to it)
// if we found a collection, which we are not at the sibling level that actually does have siblings
if (((pElement->type == kIOHIDElementTypeCollection) && (pPreviousElement != pElement->pSibling) && pElement->pSibling) ||
// or if we are at the top
(NULL == pElement->pPrevious)) // at top of tree
break;
}
if (NULL == pElement->pPrevious)
return NULL; // got to top of list with only a collection as the first element
// now we must have been down the child route so go down the sibling route
pElement = pElement->pSibling; // element of interest
return hid_GetDeviceElement (pElement, typeMask); // otherwise return this element
}
}
return NULL;
}
// return true if this is a valid device pointer
Boolean HIDIsValidDevice(const pRecDevice pSearchDevice)
{
pRecDevice pDevice = gpDeviceList;
while (pDevice)
{
if (pDevice == pSearchDevice)
return true;
pDevice = pDevice->pNext;
}
return false;
}
static IOReturn hid_CreateQueue (pRecDevice pDevice)
{
IOReturn result = kIOReturnError; // assume failure (pessimist!)
if (HIDIsValidDevice(pDevice))
{
if (NULL == pDevice->queue) // do we already have a queue
{
if (NULL != pDevice->interface)
{
pDevice->queue = (void *) (*(IOHIDDeviceInterface**) pDevice->interface)->allocQueue (pDevice->interface); // alloc queue
if (pDevice->queue)
{
result = (*(IOHIDQueueInterface**) pDevice->queue)->create (pDevice->queue, 0, kDeviceQueueSize); // create actual queue
if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("hid_CreateQueue - Failed to create queue via create", result);
}
else
{
HIDREPORTERROR ("hid_CreateQueue - Failed to alloc IOHIDQueueInterface ** via allocQueue");
result = kIOReturnError; // synthesis error
}
}
else
HIDREPORTERRORNUM ("hid_CreateQueue - Device inteface does not exist for queue creation", result);
}
}
else
HIDREPORTERRORNUM ("hid_CreateQueue - Invalid Device", result);
return result;
}
static unsigned long HIDQueueDevice (pRecDevice pDevice)
{
IOReturn result = kIOReturnError; // assume failure (pessimist!)
pRecElement pElement;
if (HIDIsValidDevice(pDevice))
{
// error checking
if (NULL == pDevice)
{
HIDREPORTERROR ("HIDQueueDevice - Device does not exist.");
return kIOReturnBadArgument;
}
if (NULL == pDevice->interface) // must have interface
{
HIDREPORTERROR ("HIDQueueDevice - Device does not have interface.");
return kIOReturnError;
}
if (NULL == pDevice->queue) // if no queue create queue
result = hid_CreateQueue (pDevice);
if ((kIOReturnSuccess != result) || (NULL == pDevice->queue))
{
HIDREPORTERRORNUM ("HIDQueueDevice - problem creating queue.", result);
if (kIOReturnSuccess != result)
return result;
else
return kIOReturnError;
}
// stop queue
result = (*(IOHIDQueueInterface**) pDevice->queue)->stop (pDevice->queue);
if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("HIDQueueDevice - Failed to stop queue.", result);
// queue element
//<2F> pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeIO);
pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeInput | kHIDElementTypeFeature);
while (pElement)
{
if (!(*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie))
{
result = (*(IOHIDQueueInterface**) pDevice->queue)->addElement (pDevice->queue, pElement->cookie, 0);
if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("HIDQueueDevice - Failed to add element to queue.", result);
}
//<2F> pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeInput | kHIDElementTypeFeature);
}
// start queue
result = (*(IOHIDQueueInterface**) pDevice->queue)->start (pDevice->queue);
if (kIOReturnSuccess != result)
HIDREPORTERRORNUM ("HIDQueueDevice - Failed to start queue.", result);
}
else
HIDREPORTERROR ("HIDQueueDevice - Invalid device.");
return result;
}
/* -- END HID UTILITIES -- */
static int available_mice = 0;
static pRecDevice *devices = NULL;
/* returns non-zero if (a <= b). */
typedef unsigned long long ui64;
static inline int oldEvent(const AbsoluteTime *a, const AbsoluteTime *b)
{
#if 0 // !!! FIXME: doesn't work, timestamps aren't reliable.
const ui64 a64 = (((unsigned long long) a->hi) << 32) | a->lo;
const ui64 b64 = (((unsigned long long) b->hi) << 32) | b->lo;
#endif
return 0;
} /* oldEvent */
static int poll_mouse(pRecDevice mouse, ManyMouseEvent *outevent)
{
int unhandled = 1;
while (unhandled) /* read until failure or valid event. */
{
pRecElement recelem;
IOHIDEventStruct event;
if (!HIDGetEvent(mouse, &event))
return(0); /* no new event. */
unhandled = 0; /* will reset if necessary. */
recelem = HIDGetFirstDeviceElement(mouse, kHIDElementTypeInput);
while (recelem != NULL)
{
if (recelem->cookie == event.elementCookie)
break;
recelem = HIDGetNextDeviceElement(recelem, kHIDElementTypeInput);
} /* while */
if (recelem == NULL)
continue; /* unknown device element. Can this actually happen? */
outevent->value = event.value;
if (recelem->usagePage == kHIDPage_GenericDesktop)
{
/*
* some devices (two-finger-scroll trackpads?) seem to give
* a flood of events with values of zero for every legitimate
* event. Throw these zero events out.
*/
if (outevent->value == 0)
unhandled = 1;
else
{
switch (recelem->usage)
{
case kHIDUsage_GD_X:
case kHIDUsage_GD_Y:
if (oldEvent(&event.timestamp, &mouse->lastScrollTime))
unhandled = 1;
else
{
outevent->type = MANYMOUSE_EVENT_RELMOTION;
if (recelem->usage == kHIDUsage_GD_X)
outevent->item = 0;
else
outevent->item = 1;
} /* else */
break;
case kHIDUsage_GD_Wheel:
memcpy(&mouse->lastScrollTime, &event.timestamp,
sizeof (AbsoluteTime));
outevent->type = MANYMOUSE_EVENT_SCROLL;
outevent->item = 0; /* !!! FIXME: horiz scroll? */
break;
default: /* !!! FIXME: absolute motion? */
unhandled = 1;
} /* switch */
} /* else */
} /* if */
else if (recelem->usagePage == kHIDPage_Button)
{
outevent->type = MANYMOUSE_EVENT_BUTTON;
outevent->item = ((int) recelem->usage) - 1;
} /* else if */
else
{
unhandled = 1;
} /* else */
} /* while */
return(1); /* got a valid event */
} /* poll_mouse */
static void macosx_hidutilities_quit(void)
{
HIDReleaseAllDeviceQueues();
HIDReleaseDeviceList();
free(devices);
devices = NULL;
available_mice = 0;
} /* macosx_hidutilities_quit */
static int macosx_hidutilities_init(void)
{
macosx_hidutilities_quit(); /* just in case... */
if (!HIDBuildDeviceList(kHIDPage_GenericDesktop, kHIDUsage_GD_Mouse))
return(-1);
available_mice = HIDCountDevices();
if (available_mice > 0)
{
int i;
pRecDevice dev = NULL;
dev = HIDGetFirstDevice();
devices = (pRecDevice *) malloc(sizeof (pRecDevice) * available_mice);
if ((devices == NULL) || (dev == NULL))
{
macosx_hidutilities_quit();
return(-1);
} /* if */
for (i = 0; i < available_mice; i++)
{
if (dev == NULL) /* what? list ended? Truncate final list... */
available_mice = i;
if (HIDQueueDevice(dev) == kIOReturnSuccess)
devices[i] = dev;
else /* failed? Chop this device from the list... */
{
i--;
available_mice--;
} /* else */
dev = HIDGetNextDevice(dev);
} /* for */
} /* if */
return(available_mice);
} /* macosx_hidutilities_init */
static const char *macosx_hidutilities_name(unsigned int index)
{
if (index >= available_mice)
return(NULL);
return((const char *) devices[index]->product);
} /* macosx_hidutilities_name */
static int macosx_hidutilities_poll(ManyMouseEvent *event)
{
/*
* (i) is static so we iterate through all mice round-robin. This
* prevents a chatty mouse from dominating the queue.
*/
static unsigned int i = 0;
if (i >= available_mice)
i = 0; /* handle reset condition. */
if (event != NULL)
{
while (i < available_mice)
{
pRecDevice dev = devices[i];
if ((dev) && (dev->disconnect != DISCONNECT_COMPLETE))
{
event->device = i;
/* see if mouse was unplugged since last polling... */
if (dev->disconnect == DISCONNECT_TELLUSER)
{
dev->disconnect = DISCONNECT_COMPLETE;
event->type = MANYMOUSE_EVENT_DISCONNECT;
return(1);
} /* if */
if (poll_mouse(dev, event))
return(1);
} /* if */
i++;
} /* while */
} /* if */
return(0); /* no new events */
} /* macosx_hidutilities_poll */
static const ManyMouseDriver ManyMouseDriver_interface =
{
macosx_hidutilities_init,
macosx_hidutilities_quit,
macosx_hidutilities_name,
macosx_hidutilities_poll
};
const ManyMouseDriver *ManyMouseDriver_hidutilities = &ManyMouseDriver_interface;
#else
const ManyMouseDriver *ManyMouseDriver_hidutilities = 0;
#endif /* ifdef Mac OS X blocker */
/* end of macosx_hidutilities.c ... */
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