Use SMC for temp and only use IOHIDSensor based on a whitelist for when SMC is unavailable

Classes/IOHIDSensor.m

@@ -0,0 +1,70 @@
+/*
+ *    FanControl
+ *
+ *    Copyright (c) 2006-2012 Hendrik Holtmann
+ *
+ *    Sensor.m - MacBook(Pro) FanControl application
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#import "IOHIDSensor.h"
+
+@implementation IOHIDSensor
+
+static BOOL isSOCSensor(CFStringRef sensorName) {
+    return CFStringFind(sensorName, CFSTR("SOC"), kCFCompareCaseInsensitive).location != kCFNotFound;
+}
+
+static float toOneDecimalPlace(float value) {
+    return roundf(10.0f * value) / 10.0f;
+}
+
++ (float) getSOCTemperature {
+    IOHIDEventSystemClientRef eventSystemClient = IOHIDEventSystemClientCreate(kCFAllocatorDefault);
+    CFArrayRef services = IOHIDEventSystemClientCopyServices(eventSystemClient);
+    if (services) {
+        
+        float socSensorSum = 0.0f;
+        int socSensorCount = 0;
+        
+        for (int i = 0; i < CFArrayGetCount(services); i++) {
+            IOHIDServiceClientRef serviceClientRef = (IOHIDServiceClientRef)CFArrayGetValueAtIndex(services, i);
+            CFStringRef sensorName = IOHIDServiceClientCopyProperty(serviceClientRef, CFSTR("Product"));
+            if (sensorName) {
+                if (isSOCSensor(sensorName)) {
+                    IOHIDEventRef event = IOHIDServiceClientCopyEvent(serviceClientRef, kIOHIDEventTypeTemperature, 0, 0);
+                    if (event) {
+                        IOHIDFloat sensorTemperature = IOHIDEventGetFloatValue(event, IOHIDEventFieldBase(kIOHIDEventTypeTemperature));
+                        CFRelease(event);
+                        socSensorSum += sensorTemperature;
+                        socSensorCount++;
+                    }
+                }
+                CFRelease(sensorName);
+            }
+        }
+        
+        CFRelease(services);
+        CFRelease(eventSystemClient);
+        
+        float avgSOCTemp = socSensorCount > 0 ? socSensorSum / socSensorCount : 0.0f;
+        return toOneDecimalPlace(avgSOCTemp);
+    }
+    
+    return 0.0f;
+}
+
+@end