QSLMUMonitor.m

//
//  QSLMUMonitor.m
//  Nocturne
//
//  Created by Nicholas Jitkoff on 5/14/07.
//  Copyright 2007 Blacktree. All rights reserved.
//

#import "QSLMUMonitor.h"


@implementation QSLMUMonitor
+ (void)initialize {
  [self setKeys:[NSArray arrayWithObject:@"monitorSensors"] triggerChangeNotificationsForDependentKey:@"fuzzyAverage"];
}
- (int)average {
  return (left + right) / 2 ;
}
- (int)fuzzyAverage {
  if (left + right < 0) return 0;
  return (left + right) / 2 + ((rand()%3) - 2);
}
- (int)maxValue{
  return 1600;
}
- (float)percent {
  return 100.0 * (float)[self average] / [self maxValue];
}

- (void)checkValues:(NSTimer *)timer {
  IOItemCount   scalarInputCount = 0;
  IOItemCount   scalarOutputCount = 2;
  /*
  SInt32 newLeft;
  SInt32 newRight;
  kern_return_t kr = IOConnectMethodScalarIScalarO(dataPort, kGetSensorReadingID,
                                                   scalarInputCount, scalarOutputCount, &newLeft, &newRight);
  if (kr == KERN_SUCCESS) {
    
    SInt32 oldAvg = (left + right) / 2 ;
    SInt32 newAvg = (newLeft + newRight) / 2;
    if (newAvg > 0) {
      if (newAvg < lowerBound && oldAvg >= lowerBound) {
        [delegate monitor:self passedLowerBound:lowerBound withValue:newAvg];
      }
      if (newAvg > upperBound && oldAvg <= upperBound){
        [delegate monitor:self passedUpperBound:upperBound withValue:newAvg];
      }
    }
    if (sendNotifications) {
    [self willChangeValueForKey:@"fuzzyAverage"];
    [self willChangeValueForKey:@"percent"];
    [self didChangeValueForKey:@"fuzzyAverage"];
    [self didChangeValueForKey:@"percent"];
    }
    left = newLeft;
    right = newRight;
   //NSLog(@"%8ld %8ld %d", lowerBound, upperBound, newAvg);
    
    return;
  }
  
// NSLog(@"kr %x", kr);
 
  if (kr == kIOReturnBusy) return;
    mach_error("I/O Kit error:", kr);
  //  exit(kr);
   */

}

+ (BOOL)hasSensors {
  io_service_t serviceObject = IOServiceGetMatchingService(kIOMasterPortDefault,
                                                           IOServiceMatching("AppleLMUController"));
  if (!serviceObject) {
    serviceObject = IOServiceGetMatchingService(kIOMasterPortDefault,
                                                IOServiceMatching("IOI2CDeviceLMU")); 
  }
  if (!serviceObject) return NO;
  IOObjectRelease(serviceObject);
  return YES;
}

- (id) init {
  self = [super init];
  if (self != nil) {
    left = -1;
    right = -1;
    sendNotifications = [NSApp isActive];
    // Look up a registered IOService object whose class is AppleLMUController
    io_service_t serviceObject = IOServiceGetMatchingService(kIOMasterPortDefault,
                                                             IOServiceMatching("AppleLMUController"));
    if (!serviceObject) {
      serviceObject = IOServiceGetMatchingService(kIOMasterPortDefault,
                                                  IOServiceMatching("IOI2CDeviceLMU")); 
    }
    
    if (!serviceObject) {
      fprintf(stderr, "failed to find ambient light sensor\n");
      [self release];
      return nil;
    }
    
    
    // Create a connection to the IOService object
    kern_return_t kr = IOServiceOpen(serviceObject, mach_task_self(), 0, &dataPort);
    IOObjectRelease(serviceObject);
    if (kr != KERN_SUCCESS) {
      mach_error("IOServiceOpen:", kr);
      exit(kr);
    }
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(appWillActivate:)
                                                 name:NSApplicationWillBecomeActiveNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(appDidResign:)
                                                 name:NSApplicationDidResignActiveNotification
                                               object:nil];
    [self setMonitorSensors:YES];
  }
  return self;
}



- (void) removeTimer {
  [checkTimer invalidate];
  checkTimer = nil;
}

- (void) scheduleTimerWithInterval:(float)interval {
  [self removeTimer];
  checkTimer = [[NSTimer scheduledTimerWithTimeInterval:interval
                                                 target:self
                                               selector:@selector(checkValues:)
                                               userInfo:nil
                                                repeats:YES] retain];
}

- (void)appWillActivate:(id)sender {
  if (checkTimer) 
    [self scheduleTimerWithInterval:0.3333];
  sendNotifications = YES;
  
}
- (void)appDidResign:(id)sender {
  if (checkTimer) 
    [self scheduleTimerWithInterval:1.0];
  sendNotifications = NO;
}

- (void) setMonitorSensors:(BOOL)flag {
  if (flag) {
    if (!checkTimer) {
      [self scheduleTimerWithInterval:[NSApp isActive] ? 0.33333 : 1.0];
      [self checkValues:nil]; 
    }
  } else {
    [self removeTimer];
  }
  left = -1;
  right = -1;
}

- (void) dealloc {
  [checkTimer invalidate];
  checkTimer = nil;
  [self setDelegate:nil];
  [[NSNotificationCenter defaultCenter] removeObserver:self];
  [super dealloc];
}

- (id)delegate {
  return [[delegate retain] autorelease];
}

- (void)setDelegate:(id)value {
  if (delegate != value) {
    [delegate release];
    delegate = [value retain];
  }
}

- (SInt32)lowerBound {
  return lowerBound;
}

- (void)setLowerBound:(SInt32)value {
    lowerBound = value;
}

- (SInt32)upperBound {
  return upperBound;
}

- (void)setUpperBound:(SInt32)value {
    upperBound = value;
}



@end