Joystick.m

   1 //
   2 //  Joystick.m
   3 //  Enjoy
   4 //
   5 //  Created by Sam McCall on 4/05/09.
   6 //
   7
   8 @implementation Joystick
   9
  10
  11 @synthesize     vendorId, productId, productName, name, index, device, children;
  12
  13 -(id)initWithDevice: (IOHIDDeviceRef) newDevice {
  14         if(self=[super init]) {
  15                 children = [[NSMutableArray alloc]init];
  16
  17                 device = newDevice;
  18                 productName = (NSString*)IOHIDDeviceGetProperty( device, CFSTR(kIOHIDProductKey) );
  19                 vendorId = [(NSNumber*)IOHIDDeviceGetProperty(device, CFSTR(kIOHIDVendorIDKey)) intValue];
  20                 productId = [(NSNumber*)IOHIDDeviceGetProperty(device, CFSTR(kIOHIDVendorIDKey)) intValue];
  21
  22                 name = productName;
  23         }
  24         return self;
  25 }
  26
  27 -(void) setIndex: (int) newIndex {
  28         index = newIndex;
  29         name = [[NSString alloc] initWithFormat: @"%@ #%d", productName, (index+1)];
  30 }
  31 -(int) index {
  32         return index;
  33 }
  34
  35 -(void) invalidate {
  36         IOHIDDeviceClose(device, kIOHIDOptionsTypeNone);
  37         NSLog(@"Removed a device: %@", [self name]);
  38 }
  39
  40 -(id) base {
  41         return NULL;
  42 }
  43
  44 -(void) populateActions {
  45         NSArray* elements = (NSArray*)IOHIDDeviceCopyMatchingElements(device, NULL, kIOHIDOptionsTypeNone);
  46
  47         int buttons = 0;
  48         int axes = 0;
  49
  50         for(int i=0; i<[elements count]; i++) {
  51                 IOHIDElementRef element = (IOHIDElementRef)[elements objectAtIndex: i];
  52                 int type = IOHIDElementGetType(element);
  53                 int usage = IOHIDElementGetUsage(element);
  54                 int usagePage = IOHIDElementGetUsagePage(element);
  55                 int max = IOHIDElementGetPhysicalMax(element);
  56                 int min = IOHIDElementGetPhysicalMin(element);
  57         CFStringRef elName = IOHIDElementGetName(element);
  58
  59 //              if(usagePage != 1 || usagePage == 9) {
  60 //                      NSLog(@"Skipping usage page %x usage %x", usagePage, usage);
  61 //                      continue;
  62 //              }
  63
  64                 JSAction* action = NULL;
  65
  66                 if(!(type == kIOHIDElementTypeInput_Misc || type == kIOHIDElementTypeInput_Axis ||
  67                          type == kIOHIDElementTypeInput_Button)) {
  68
  69                         continue;
  70                 }
  71
  72                 if((max - min == 1) || usagePage == kHIDPage_Button || type == kIOHIDElementTypeInput_Button) {
  73                         action = [[JSActionButton alloc] initWithIndex: buttons++ andName: (NSString *)elName];
  74                         [(JSActionButton*)action setMax: max];
  75                 } else if(usage == 0x39)
  76                         action = [[JSActionHat alloc] init];
  77                 else {
  78                         if(usage >= 0x30 && usage < 0x36) {
  79                                 action = [[JSActionAnalog alloc] initWithIndex: axes++];
  80                                 [(JSActionAnalog*)action setOffset: (double)-1.0];
  81                                 [(JSActionAnalog*)action setScale: (double)2.0/(max - min)];
  82                         } else
  83                                 continue;
  84                 }
  85
  86                 [action setBase: self];
  87                 [action setUsage: usage];
  88                 [action setCookie: IOHIDElementGetCookie(element)];
  89                 [children addObject:action];
  90         }
  91 }
  92
  93 -(NSString*) stringify {
  94         return [[NSString alloc] initWithFormat: @"%d~%d~%d", vendorId, productId, index];
  95 }
  96
  97 - (JSAction*) findActionByCookie: (void*) cookie {
  98         for(int i=0; i<[children count]; i++)
  99                 if([[children objectAtIndex:i]cookie] == cookie)
 100                         return (JSAction*)[children objectAtIndex:i];
 101         return NULL;
 102 }
 103
 104 -(id) handlerForEvent: (IOHIDValueRef) value {
 105         JSAction* mainAction = [self actionForEvent: value];
 106         if(!mainAction)
 107                 return NULL;
 108         return [mainAction findSubActionForValue: value];
 109 }
 110 -(JSAction*) actionForEvent: (IOHIDValueRef) value {
 111         IOHIDElementRef elt = IOHIDValueGetElement(value);
 112         void* cookie = IOHIDElementGetCookie(elt);
 113         return [self findActionByCookie: cookie];
 114 }
 115
 116 @end