The Tor Browser: hal/cocoa/smslib.mm@7e26c7da4463 (annotated)

hal/cocoa/smslib.mm@7e26c7da4463 (annotated)

hal/cocoa/smslib.mm

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /*
  * smslib.m
  *
  * SMSLib Sudden Motion Sensor Access Library
  * Copyright (c) 2010 Suitable Systems
  * All rights reserved.
  *
  * Developed by: Daniel Griscom
  *               Suitable Systems
  *               http://www.suitable.com
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the
  * "Software"), to deal with the Software without restriction, including
  * without limitation the rights to use, copy, modify, merge, publish,
  * distribute, sublicense, and/or sell copies of the Software, and to
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
  * - Redistributions of source code must retain the above copyright notice,
  * this list of conditions and the following disclaimers.
  *
  * - Redistributions in binary form must reproduce the above copyright
  * notice, this list of conditions and the following disclaimers in the
  * documentation and/or other materials provided with the distribution.
  *
  * - Neither the names of Suitable Systems nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this Software without specific prior written permission.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  * IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR
  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  * SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE SOFTWARE.
  *
  * For more information about SMSLib, see
  *		<http://www.suitable.com/tools/smslib.html>
  * or contact
  *		Daniel Griscom
  *		Suitable Systems
  *		1 Centre Street, Suite 204
  *		Wakefield, MA 01880
  *		(781) 665-0053
  *
  */
 #import <IOKit/IOKitLib.h>
 #import <sys/sysctl.h>
 #import <math.h>
 #import "smslib.h"
 #pragma mark Internal structures
 // Represents a single axis of a type of sensor.
 typedef struct axisStruct {
 	int enabled;				// Non-zero if axis is valid in this sensor
 	int index;					// Location in struct of first byte
 	int size;					// Number of bytes
 	float zerog;				// Value meaning "zero g"
 	float oneg;					// Change in value meaning "increase of one g"
 								// (can be negative if axis sensor reversed)
 } axisStruct;
 // Represents the configuration of a type of sensor.
 typedef struct sensorSpec {
 	const char *model;			// Prefix of model to be tested
 	const char *name;			// Name of device to be read
 	unsigned int function;		// Kernel function index
 	int recordSize;				// Size of record to be sent/received
 	axisStruct axes[3];			// Description of three axes (X, Y, Z)
 } sensorSpec;
 // Configuration of all known types of sensors. The configurations are
 // tried in order until one succeeds in returning data.
 // All default values are set here, but each axis' zerog and oneg values
 // may be changed to saved (calibrated) values.
 //
 // These values came from SeisMaCalibrate calibration reports. In general I've
 // found the following:
 //	- All Intel-based SMSs have 250 counts per g, centered on 0, but the signs
 //		are different (and in one case two axes are swapped)
 //	- PowerBooks and iBooks all have sensors centered on 0, and reading
 //		50-53 steps per gravity (but with differing polarities!)
 //	- PowerBooks and iBooks of the same model all have the same axis polarities
 //	- PowerBook and iBook access methods are model- and OS version-specific
 //
 // So, the sequence of tests is:
 //	- Try model-specific access methods. Note that the test is for a match to the
 //		beginning of the model name, e.g. the record with model name "MacBook"
 //		matches computer models "MacBookPro1,2" and "MacBook1,1" (and ""
 //		matches any model).
 //	- If no model-specific record's access fails, then try each model-independent
 //		access method in order, stopping when one works.
 static const sensorSpec sensors[] = {
 	// ****** Model-dependent methods ******
 	// The PowerBook5,6 is one of the G4 models that seems to lose
 	// SMS access until the next reboot.
 	{"PowerBook5,6", "IOI2CMotionSensor", 21, 60, {
 			{1, 0, 1, 0,  51.5},
 			{1, 1, 1, 0, -51.5},
 			{1, 2, 1, 0, -51.5}
 		}
 	},
 	// The PowerBook5,7 is one of the G4 models that seems to lose
 	// SMS access until the next reboot.
 	{"PowerBook5,7", "IOI2CMotionSensor", 21, 60, {
 			{1, 0, 1, 0,  51.5},
 			{1, 1, 1, 0,  51.5},
 			{1, 2, 1, 0,  51.5}
 		}
 	},
 	// Access seems to be reliable on the PowerBook5,8
 	{"PowerBook5,8", "PMUMotionSensor", 21, 60, {
 			{1, 0, 1, 0, -51.5},
 			{1, 1, 1, 0,  51.5},
 			{1, 2, 1, 0, -51.5}
 		}
 	},
 	// Access seems to be reliable on the PowerBook5,9
 	{"PowerBook5,9", "PMUMotionSensor", 21, 60, {
 			{1, 0, 1, 0,  51.5},
 			{1, 1, 1, 0, -51.5},
 			{1, 2, 1, 0, -51.5}
 		}
 	},
 	// The PowerBook6,7 is one of the G4 models that seems to lose
 	// SMS access until the next reboot.
 	{"PowerBook6,7", "IOI2CMotionSensor", 21, 60, {
 			{1, 0, 1, 0,  51.5},
 			{1, 1, 1, 0,  51.5},
 			{1, 2, 1, 0,  51.5}
 		}
 	},
 	// The PowerBook6,8 is one of the G4 models that seems to lose
 	// SMS access until the next reboot.
 	{"PowerBook6,8", "IOI2CMotionSensor", 21, 60, {
 			{1, 0, 1, 0,  51.5},
 			{1, 1, 1, 0,  51.5},
 			{1, 2, 1, 0,  51.5}
 		}
 	},
 	// MacBook Pro Core 2 Duo 17". Note the reversed Y and Z axes.
 	{"MacBookPro2,1", "SMCMotionSensor", 5, 40, {
 			{1, 0, 2, 0,  251},
 			{1, 2, 2, 0, -251},
 			{1, 4, 2, 0, -251}
 		}
 	},
 	// MacBook Pro Core 2 Duo 15" AND 17" with LED backlight, introduced June '07.
 	// NOTE! The 17" machines have the signs of their X and Y axes reversed
 	// from this calibration, but there's no clear way to discriminate between
 	// the two machines.
 	{"MacBookPro3,1", "SMCMotionSensor", 5, 40, {
 			{1, 0, 2, 0, -251},
 			{1, 2, 2, 0,  251},
 			{1, 4, 2, 0, -251}
 		}
 	},
 	// ... specs?
 	{"MacBook5,2", "SMCMotionSensor", 5, 40, {
 			{1, 0, 2, 0, -251},
 			{1, 2, 2, 0,  251},
 			{1, 4, 2, 0, -251}
 		}
 	},
 	// ... specs?
 	{"MacBookPro5,1", "SMCMotionSensor", 5, 40, {
 			{1, 0, 2, 0, -251},
 			{1, 2, 2, 0, -251},
 			{1, 4, 2, 0,  251}
 		}
 	},
 	// ... specs?
 	{"MacBookPro5,2", "SMCMotionSensor", 5, 40, {
 			{1, 0, 2, 0, -251},
 			{1, 2, 2, 0, -251},
 			{1, 4, 2, 0,  251}
 		}
 	},
 	// This is speculative, based on a single user's report. Looks like the X and Y axes
 	// are swapped. This is true for no other known Appple laptop.
 	{"MacBookPro5,3", "SMCMotionSensor", 5, 40, {
 			{1, 2, 2, 0, -251},
 			{1, 0, 2, 0, -251},
 			{1, 4, 2, 0, -251}
 		}
 	},
 	// ... specs?
 	{"MacBookPro5,4", "SMCMotionSensor", 5, 40, {
 			{1, 0, 2, 0, -251},
 			{1, 2, 2, 0, -251},
 			{1, 4, 2, 0,  251}
 		}
 	},
 	// ****** Model-independent methods ******
 	// Seen once with PowerBook6,8 under system 10.3.9; I suspect
 	// other G4-based 10.3.* systems might use this
 	{"", "IOI2CMotionSensor", 24, 60, {
 			{1, 0, 1, 0, 51.5},
 			{1, 1, 1, 0, 51.5},
 			{1, 2, 1, 0, 51.5}
 		}
 	},
 	// PowerBook5,6 , PowerBook5,7 , PowerBook6,7 , PowerBook6,8
 	// under OS X 10.4.*
 	{"", "IOI2CMotionSensor", 21, 60, {
 			{1, 0, 1, 0, 51.5},
 			{1, 1, 1, 0, 51.5},
 			{1, 2, 1, 0, 51.5}
 		}
 	},
 	// PowerBook5,8 , PowerBook5,9 under OS X 10.4.*
 	{"", "PMUMotionSensor", 21, 60, {
 			// Each has two out of three gains negative, but it's different
 			// for the different models. So, this will be right in two out
 			// of three axis for either model.
 			{1, 0, 1,  0, -51.5},
 			{1, 1, 1, -6, -51.5},
 			{1, 2, 1,  0, -51.5}
 		}
 	},
 	// All MacBook, MacBookPro models. Hardware (at least on early MacBookPro 15")
 	// is Kionix KXM52-1050 three-axis accelerometer chip. Data is at
 	// http://kionix.com/Product-Index/product-index.htm. Specific MB and MBP models
 	// that use this are:
 	//		MacBook1,1
 	//		MacBook2,1
 	//		MacBook3,1
 	//		MacBook4,1
 	//		MacBook5,1
 	//		MacBook6,1
 	//		MacBookAir1,1
 	//		MacBookPro1,1
 	//		MacBookPro1,2
 	//		MacBookPro4,1
 	//		MacBookPro5,5
 	{"", "SMCMotionSensor", 5, 40, {
 			{1, 0, 2, 0, 251},
 			{1, 2, 2, 0, 251},
 			{1, 4, 2, 0, 251}
 		}
 	}
 };
 #define SENSOR_COUNT (sizeof(sensors)/sizeof(sensorSpec))
 #pragma mark Internal prototypes
 static int getData(sms_acceleration *accel, int calibrated, id logObject, SEL logSelector);
 static float getAxis(int which, int calibrated);
 static int signExtend(int value, int size);
 static NSString *getModelName(void);
 static NSString *getOSVersion(void);
 static BOOL loadCalibration(void);
 static void storeCalibration(void);
 static void defaultCalibration(void);
 static void deleteCalibration(void);
 static int prefIntRead(NSString *prefName, BOOL *success);
 static void prefIntWrite(NSString *prefName, int prefValue);
 static float prefFloatRead(NSString *prefName, BOOL *success);
 static void prefFloatWrite(NSString *prefName, float prefValue);
 static void prefDelete(NSString *prefName);
 static void prefSynchronize(void);
 // static long getMicroseconds(void);
 float fakeData(NSTimeInterval time);
 #pragma mark Static variables
 static int debugging = NO;		// True if debugging (synthetic data)
 static io_connect_t connection;	// Connection for reading accel values
 static int running = NO;		// True if we successfully started
 static unsigned int sensorNum = 0;		// The current index into sensors[]
 static const char *serviceName;	// The name of the current service
 static char *iRecord, *oRecord;	// Pointers to read/write records for sensor
 static int recordSize;			// Size of read/write records
 static unsigned int function;	// Which kernel function should be used
 static float zeros[3];			// X, Y and Z zero calibration values
 static float onegs[3];			// X, Y and Z one-g calibration values
 #pragma mark Defines
 // Pattern for building axis letter from axis number
 #define INT_TO_AXIS(a) (a == 0 ? @"X" : a == 1 ? @"Y" : @"Z")
 // Name of configuration for given axis' zero (axis specified by integer)
 #define ZERO_NAME(a) [NSString stringWithFormat:@"%@-Axis-Zero", INT_TO_AXIS(a)]
 // Name of configuration for given axis' oneg (axis specified by integer)
 #define ONEG_NAME(a) [NSString stringWithFormat:@"%@-Axis-One-g", INT_TO_AXIS(a)]
 // Name of "Is calibrated" preference
 #define CALIBRATED_NAME (@"Calibrated")
 // Application domain for SeisMac library
 #define APP_ID ((CFStringRef)@"com.suitable.SeisMacLib")
 // These #defines make the accelStartup code a LOT easier to read.
 #undef LOG
 #define LOG(message) \
 	if (logObject) { \
 		[logObject performSelector:logSelector withObject:message]; \
 	}
 #define LOG_ARG(format, var1) \
 	if (logObject) { \
 		[logObject performSelector:logSelector \
 			withObject:[NSString stringWithFormat:format, var1]]; \
 	}
 #define LOG_2ARG(format, var1, var2) \
 	if (logObject) { \
 		[logObject performSelector:logSelector \
 			withObject:[NSString stringWithFormat:format, var1, var2]]; \
 	}
 #define LOG_3ARG(format, var1, var2, var3) \
 	if (logObject) { \
 		[logObject performSelector:logSelector \
 			withObject:[NSString stringWithFormat:format, var1, var2, var3]]; \
 	}
 #pragma mark Function definitions
 // This starts up the accelerometer code, trying each possible sensor
 // specification. Note that for logging purposes it
 // takes an object and a selector; the object's selector is then invoked
 // with a single NSString as argument giving progress messages. Example
 // logging method:
 //		- (void)logMessage: (NSString *)theString
 // which would be used in accelStartup's invocation thusly:
 //		result = accelStartup(self, @selector(logMessage:));
 // If the object is nil, then no logging is done. Sets calibation from built-in
 // value table. Returns ACCEL_SUCCESS for success, and other (negative)
 // values for various failures (returns value indicating result of
 // most successful trial).
 int smsStartup(id logObject, SEL logSelector) {
 	io_iterator_t iterator;
 	io_object_t device;
 	kern_return_t result;
 	sms_acceleration accel;
 	int failure_result = SMS_FAIL_MODEL;
 	running = NO;
 	debugging = NO;
 	NSString *modelName = getModelName();
 	LOG_ARG(@"Machine model: %@\n", modelName);
 	LOG_ARG(@"OS X version: %@\n", getOSVersion());
 	LOG_ARG(@"Accelerometer library version: %s\n", SMSLIB_VERSION);
 	for (sensorNum = 0; sensorNum < SENSOR_COUNT; sensorNum++) {
 		// Set up all specs for this type of sensor
 		serviceName = sensors[sensorNum].name;
 		recordSize = sensors[sensorNum].recordSize;
 		function = sensors[sensorNum].function;
 		LOG_3ARG(@"Trying service \"%s\" with selector %d and %d byte record:\n",
 				serviceName, function, recordSize);
 		NSString *targetName = [NSString stringWithCString:sensors[sensorNum].model
 												  encoding:NSMacOSRomanStringEncoding];
 		LOG_ARG(@"    Comparing model name to target \"%@\": ", targetName);
 		if ([targetName length] == 0 || [modelName hasPrefix:targetName]) {
 			LOG(@"success.\n");
 		} else {
 			LOG(@"failure.\n");
 			// Don't need to increment failure_result.
 			continue;
 		}
 		LOG(@"    Fetching dictionary for service: ");
 		CFMutableDictionaryRef dict = IOServiceMatching(serviceName);
 		if (dict) {
 			LOG(@"success.\n");
 		} else {
 			LOG(@"failure.\n");
 			if (failure_result < SMS_FAIL_DICTIONARY) {
 				failure_result = SMS_FAIL_DICTIONARY;
 			}
 			continue;
 		}
 		LOG(@"    Getting list of matching services: ");
 		result = IOServiceGetMatchingServices(kIOMasterPortDefault,
 										 dict,
 										 &iterator);
 		if (result == KERN_SUCCESS) {
 			LOG(@"success.\n");
 		} else {
 			LOG_ARG(@"failure, with return value 0x%x.\n", result);
 			if (failure_result < SMS_FAIL_LIST_SERVICES) {
 				failure_result = SMS_FAIL_LIST_SERVICES;
 			}
 			continue;
 		}
 		LOG(@"    Getting first device in list: ");
 		device = IOIteratorNext(iterator);
 		if (device == 0) {
 			LOG(@"failure.\n");
 			if (failure_result < SMS_FAIL_NO_SERVICES) {
 				failure_result = SMS_FAIL_NO_SERVICES;
 			}
 			continue;
 		} else {
 			LOG(@"success.\n");
 			LOG(@"    Opening device: ");
 		}
 		result = IOServiceOpen(device, mach_task_self(), 0, &connection);
 		if (result != KERN_SUCCESS) {
 			LOG_ARG(@"failure, with return value 0x%x.\n", result);
 			IOObjectRelease(device);
 			if (failure_result < SMS_FAIL_OPENING) {
 				failure_result = SMS_FAIL_OPENING;
 			}
 			continue;
 		} else if (connection == 0) {
 			LOG_ARG(@"'success', but didn't get a connection (return value was: 0x%x).\n", result);
 			IOObjectRelease(device);
 			if (failure_result < SMS_FAIL_CONNECTION) {
 				failure_result = SMS_FAIL_CONNECTION;
 			}
 			continue;
 		} else {
 			IOObjectRelease(device);
 			LOG(@"success.\n");
 		}
 		LOG(@"    Testing device.\n");
 		defaultCalibration();
 		iRecord = (char*) malloc(recordSize);
 		oRecord = (char*) malloc(recordSize);
 		running = YES;
 		result = getData(&accel, true, logObject, logSelector);
 		running = NO;
 		if (result) {
 			LOG_ARG(@"    Failure testing device, with result 0x%x.\n", result);
 			free(iRecord);
 			iRecord = 0;
 			free(oRecord);
 			oRecord = 0;
 			if (failure_result < SMS_FAIL_ACCESS) {
 				failure_result = SMS_FAIL_ACCESS;
 			}
 			continue;
 		} else {
 			LOG(@"    Success testing device!\n");
 			running = YES;
 			return SMS_SUCCESS;
 		}
 	}
 	return failure_result;
 }
 // This starts up the library in debug mode, ignoring the actual hardware.
 // Returned data is in the form of 1Hz sine waves, with the X, Y and Z
 // axes 120 degrees out of phase; "calibrated" data has range +/- (1.0/5);
 // "uncalibrated" data has range +/- (256/5). X and Y axes centered on 0.0,
 // Z axes centered on 1 (calibrated) or 256 (uncalibrated).
 // Don't use smsGetBufferLength or smsGetBufferData. Always returns SMS_SUCCESS.
 int smsDebugStartup(id logObject, SEL logSelector) {
 	LOG(@"Starting up in debug mode\n");
 	debugging = YES;
 	return SMS_SUCCESS;
 }
 // Returns the current calibration values.
 void smsGetCalibration(sms_calibration *calibrationRecord) {
 	int x;
 	for (x = 0; x < 3; x++) {
 		calibrationRecord->zeros[x] = (debugging ? 0 : zeros[x]);
 		calibrationRecord->onegs[x] = (debugging ? 256 : onegs[x]);
 	}
 }
 // Sets the calibration, but does NOT store it as a preference. If the argument
 // is nil then the current calibration is set from the built-in value table.
 void smsSetCalibration(sms_calibration *calibrationRecord) {
 	int x;
 	if (!debugging) {
 		if (calibrationRecord) {
 			for (x = 0; x < 3; x++) {
 				zeros[x] = calibrationRecord->zeros[x];
 				onegs[x] = calibrationRecord->onegs[x];
 			}
 		} else {
 			defaultCalibration();
 		}
 	}
 }
 // Stores the current calibration values as a stored preference.
 void smsStoreCalibration(void) {
 	if (!debugging)
 		storeCalibration();
 }
 // Loads the stored preference values into the current calibration.
 // Returns YES if successful.
 BOOL smsLoadCalibration(void) {
 	if (debugging) {
 		return YES;
 	} else if (loadCalibration()) {
 		return YES;
 	} else {
 		defaultCalibration();
 		return NO;
 	}
 }
 // Deletes any stored calibration, and then takes the current calibration values
 // from the built-in value table.
 void smsDeleteCalibration(void) {
 	if (!debugging) {
 		deleteCalibration();
 		defaultCalibration();
 	}
 }
 // Fills in the accel record with calibrated acceleration data. Takes
 // 1-2ms to return a value. Returns 0 if success, error number if failure.
 int smsGetData(sms_acceleration *accel) {
 	NSTimeInterval time;
 	if (debugging) {
 		usleep(1500);						// Usually takes 1-2 milliseconds
 		time = [NSDate timeIntervalSinceReferenceDate];
 		accel->x = fakeData(time)/5;
 		accel->y = fakeData(time - 1)/5;
 		accel->z = fakeData(time - 2)/5 + 1.0;
 		return true;
 	} else {
 		return getData(accel, true, nil, nil);
 	}
 }
 // Fills in the accel record with uncalibrated acceleration data.
 // Returns 0 if success, error number if failure.
 int smsGetUncalibratedData(sms_acceleration *accel) {
 	NSTimeInterval time;
 	if (debugging) {
 		usleep(1500);						// Usually takes 1-2 milliseconds
 		time = [NSDate timeIntervalSinceReferenceDate];
 		accel->x = fakeData(time) * 256 / 5;
 		accel->y = fakeData(time - 1) * 256 / 5;
 		accel->z = fakeData(time - 2) * 256 / 5 + 256;
 		return true;
 	} else {
 		return getData(accel, false, nil, nil);
 	}
 }
 // Returns the length of a raw block of data for the current type of sensor.
 int smsGetBufferLength(void) {
 	if (debugging) {
 		return 0;
 	} else if (running) {
 		return sensors[sensorNum].recordSize;
 	} else {
 		return 0;
 	}
 }
 // Takes a pointer to accelGetRawLength() bytes; sets those bytes
 // to return value from sensor. Make darn sure the buffer length is right!
 void smsGetBufferData(char *buffer) {
 	IOItemCount iSize = recordSize;
 	IOByteCount oSize = recordSize;
 	kern_return_t result;
 	if (debugging || running == NO) {
 		return;
 	}
 	memset(iRecord, 1, iSize);
 	memset(buffer, 0, oSize);
 #if __MAC_OS_X_VERSION_MIN_REQUIRED  >= 1050
 	const size_t InStructSize = recordSize;
 	size_t OutStructSize = recordSize;
 	result = IOConnectCallStructMethod(connection,
 						function,				// magic kernel function number
 						(const void *)iRecord,
 						InStructSize,
 						(void *)buffer,
 						&OutStructSize
 					);
 #else // __MAC_OS_X_VERSION_MIN_REQUIRED 1050
 	result = IOConnectMethodStructureIStructureO(connection,
 						function,				// magic kernel function number
 						iSize,
 						&oSize,
 						iRecord,
 						buffer
 					);
 #endif // __MAC_OS_X_VERSION_MIN_REQUIRED 1050
 	if (result != KERN_SUCCESS) {
 		running = NO;
 	}
 }
 // This returns an NSString describing the current calibration in
 // human-readable form. Also include a description of the machine.
 NSString *smsGetCalibrationDescription(void) {
 	BOOL success;
 	NSMutableString *s = [[NSMutableString alloc] init];
 	if (debugging) {
 		[s release];
 		return @"Debugging!";
 	}
 	[s appendString:@"---- SeisMac Calibration Record ----\n \n"];
 	[s appendFormat:@"Machine model: %@\n",
 		getModelName()];
 	[s appendFormat:@"OS X build: %@\n",
 		getOSVersion()];
 	[s appendFormat:@"SeisMacLib version %s, record %d\n \n",
 		SMSLIB_VERSION, sensorNum];
 	[s appendFormat:@"Using service \"%s\", function index %d, size %d\n \n",
 		serviceName, function, recordSize];
 	if (prefIntRead(CALIBRATED_NAME, &success) && success) {
 		[s appendString:@"Calibration values (from calibration):\n"];
 	} else {
 		[s appendString:@"Calibration values (from defaults):\n"];
 	}
 	[s appendFormat:@"    X-Axis-Zero  = %.2f\n", zeros[0]];
 	[s appendFormat:@"    X-Axis-One-g = %.2f\n", onegs[0]];
 	[s appendFormat:@"    Y-Axis-Zero  = %.2f\n", zeros[1]];
 	[s appendFormat:@"    Y-Axis-One-g = %.2f\n", onegs[1]];
 	[s appendFormat:@"    Z-Axis-Zero  = %.2f\n", zeros[2]];
 	[s appendFormat:@"    Z-Axis-One-g = %.2f\n \n", onegs[2]];
 	[s appendString:@"---- End Record ----\n"];
 	return s;
 }
 // Shuts down the accelerometer.
 void smsShutdown(void) {
 	if (!debugging) {
 		running = NO;
 		if (iRecord) free(iRecord);
 		if (oRecord) free(oRecord);
 		IOServiceClose(connection);
 	}
 }
 #pragma mark Internal functions
 // Loads the current calibration from the stored preferences.
 // Returns true iff successful.
 BOOL loadCalibration(void) {
 	BOOL thisSuccess, allSuccess;
 	int x;
 	prefSynchronize();
 	if (prefIntRead(CALIBRATED_NAME, &thisSuccess) && thisSuccess) {
 		// Calibrated. Set all values from saved values.
 		allSuccess = YES;
 		for (x = 0; x < 3; x++) {
 			zeros[x] = prefFloatRead(ZERO_NAME(x), &thisSuccess);
 			allSuccess &= thisSuccess;
 			onegs[x] = prefFloatRead(ONEG_NAME(x), &thisSuccess);
 			allSuccess &= thisSuccess;
 		}
 		return allSuccess;
 	}
 	return NO;
 }
 // Stores the current calibration into the stored preferences.
 static void storeCalibration(void) {
 	int x;
 	prefIntWrite(CALIBRATED_NAME, 1);
 	for (x = 0; x < 3; x++) {
 		prefFloatWrite(ZERO_NAME(x), zeros[x]);
 		prefFloatWrite(ONEG_NAME(x), onegs[x]);
 	}
 	prefSynchronize();
 }
 // Sets the calibration to its default values.
 void defaultCalibration(void) {
 	int x;
 	for (x = 0; x < 3; x++) {
 		zeros[x] = sensors[sensorNum].axes[x].zerog;
 		onegs[x] = sensors[sensorNum].axes[x].oneg;
 	}
 }
 // Deletes the stored preferences.
 static void deleteCalibration(void) {
 	int x;
 	prefDelete(CALIBRATED_NAME);
 	for (x = 0; x < 3; x++) {
 		prefDelete(ZERO_NAME(x));
 		prefDelete(ONEG_NAME(x));
 	}
 	prefSynchronize();
 }
 // Read a named floating point value from the stored preferences. Sets
 // the success boolean based on, you guessed it, whether it succeeds.
 static float prefFloatRead(NSString *prefName, BOOL *success) {
 	float result = 0.0f;
 	CFPropertyListRef ref = CFPreferencesCopyAppValue((CFStringRef)prefName,
 													   APP_ID);
 	// If there isn't such a preference, fail
 	if (ref == NULL) {
 		*success = NO;
 		return result;
 	}
 	CFTypeID typeID = CFGetTypeID(ref);
 	// Is it a number?
 	if (typeID == CFNumberGetTypeID()) {
 		// Is it a floating point number?
 		if (CFNumberIsFloatType((CFNumberRef)ref)) {
 			// Yup: grab it.
 			*success = CFNumberGetValue((__CFNumber*)ref, kCFNumberFloat32Type, &result);
 		} else {
 			// Nope: grab as an integer, and convert to a float.
 			long num;
 			if (CFNumberGetValue((CFNumberRef)ref, kCFNumberLongType, &num)) {
 				result = num;
 				*success = YES;
 			} else {
 				*success = NO;
 			}
 		}
 	// Or is it a string (e.g. set by the command line "defaults" command)?
 	} else if (typeID == CFStringGetTypeID()) {
 		result = (float)CFStringGetDoubleValue((CFStringRef)ref);
 		*success = YES;
 	} else {
 		// Can't convert to a number: fail.
 		*success = NO;
 	}
 	CFRelease(ref);
 	return result;
 }
 // Writes a named floating point value to the stored preferences.
 static void prefFloatWrite(NSString *prefName, float prefValue) {
 	CFNumberRef cfFloat = CFNumberCreate(kCFAllocatorDefault,
 										 kCFNumberFloatType,
 										 &prefValue);
 	CFPreferencesSetAppValue((CFStringRef)prefName,
 							 cfFloat,
 							 APP_ID);
 	CFRelease(cfFloat);
 }
 // Reads a named integer value from the stored preferences.
 static int prefIntRead(NSString *prefName, BOOL *success) {
 	Boolean internalSuccess;
 	CFIndex result = CFPreferencesGetAppIntegerValue((CFStringRef)prefName,
 													 APP_ID,
 													 &internalSuccess);
 	*success = internalSuccess;
 	return result;
 }
 // Writes a named integer value to the stored preferences.
 static void prefIntWrite(NSString *prefName, int prefValue) {
 	CFPreferencesSetAppValue((CFStringRef)prefName,
 							 (CFNumberRef)[NSNumber numberWithInt:prefValue],
 							 APP_ID);
 }
 // Deletes the named preference values.
 static void prefDelete(NSString *prefName) {
 		CFPreferencesSetAppValue((CFStringRef)prefName,
 								 NULL,
 								 APP_ID);
 }
 // Synchronizes the local preferences with the stored preferences.
 static void prefSynchronize(void) {
 	CFPreferencesAppSynchronize(APP_ID);
 }
 // Internal version of accelGetData, with logging
 int getData(sms_acceleration *accel, int calibrated, id logObject, SEL logSelector) {
 	IOItemCount iSize = recordSize;
 	IOByteCount oSize = recordSize;
 	kern_return_t result;
 	if (running == NO) {
 		return -1;
 	}
 	memset(iRecord, 1, iSize);
 	memset(oRecord, 0, oSize);
 	LOG_2ARG(@"    Querying device (%u, %d): ",
 			 sensors[sensorNum].function, sensors[sensorNum].recordSize);
 #if __MAC_OS_X_VERSION_MIN_REQUIRED  >= 1050
 	const size_t InStructSize = recordSize;
 	size_t OutStructSize = recordSize;
 	result = IOConnectCallStructMethod(connection,
 						function,				// magic kernel function number
 						(const void *)iRecord,
 						InStructSize,
 						(void *)oRecord,
 						&OutStructSize
 					);
 #else // __MAC_OS_X_VERSION_MIN_REQUIRED 1050
 	result = IOConnectMethodStructureIStructureO(connection,
 						function,				// magic kernel function number
 						iSize,
 						&oSize,
 						iRecord,
 						oRecord
 					);
 #endif // __MAC_OS_X_VERSION_MIN_REQUIRED 1050
 	if (result != KERN_SUCCESS) {
 		LOG(@"failed.\n");
 		running = NO;
 		return result;
 	} else {
 		LOG(@"succeeded.\n");
 		accel->x = getAxis(0, calibrated);
 		accel->y = getAxis(1, calibrated);
 		accel->z = getAxis(2, calibrated);
 		return 0;
 	}
 }
 // Given the returned record, extracts the value of the given axis. If
 // calibrated, then zero G is 0.0, and one G is 1.0.
 float getAxis(int which, int calibrated) {
 	// Get various values (to make code cleaner)
 	int indx = sensors[sensorNum].axes[which].index;
 	int size = sensors[sensorNum].axes[which].size;
 	float zerog = zeros[which];
 	float oneg = onegs[which];
 	// Storage for value to be returned
 	int value = 0;
 	// Although the values in the returned record should have the proper
 	// endianness, we still have to get it into the proper end of value.
 #if (BYTE_ORDER == BIG_ENDIAN)
 	// On PowerPC processors
 	memcpy(((char *)&value) + (sizeof(int) - size), &oRecord[indx], size);
 #endif
 #if (BYTE_ORDER == LITTLE_ENDIAN)
 	// On Intel processors
 	memcpy(&value, &oRecord[indx], size);
 #endif
 	value = signExtend(value, size);
 	if (calibrated) {
 		// Scale and shift for zero.
 		return ((float)(value - zerog)) / oneg;
 	} else {
 		return value;
 	}
 }
 // Extends the sign, given the length of the value.
 int signExtend(int value, int size) {
 	// Extend sign
 	switch (size) {
 		case 1:
 			if (value & 0x00000080)
 				value |= 0xffffff00;
 			break;
 		case 2:
 			if (value & 0x00008000)
 				value |= 0xffff0000;
 			break;
 		case 3:
 			if (value & 0x00800000)
 				value |= 0xff000000;
 			break;
 	}
 	return value;
 }
 // Returns the model name of the computer (e.g. "MacBookPro1,1")
 NSString *getModelName(void) {
 	char model[32];
 	size_t len = sizeof(model);
 	int name[2] = {CTL_HW, HW_MODEL};
 	NSString *result;
 	if (sysctl(name, 2, &model, &len, NULL, 0) == 0) {
 		result = [NSString stringWithFormat:@"%s", model];
 	} else {
 		result = @"";
 	}
 	return result;
 }
 // Returns the current OS X version and build (e.g. "10.4.7 (build 8J2135a)")
 NSString *getOSVersion(void) {
 	NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:
 		@"/System/Library/CoreServices/SystemVersion.plist"];
 	NSString *versionString = [dict objectForKey:@"ProductVersion"];
 	NSString *buildString = [dict objectForKey:@"ProductBuildVersion"];
 	NSString *wholeString = [NSString stringWithFormat:@"%@ (build %@)",
 		versionString, buildString];
 	return wholeString;
 }
 // Returns time within the current second in microseconds.
 // long getMicroseconds() {
 //	struct timeval t;
 //	gettimeofday(&t, 0);
 //	return t.tv_usec;
 //}
 // Returns fake data given the time. Range is +/-1.
 float fakeData(NSTimeInterval time) {
 	long secs = lround(floor(time));
 	int secsMod3 = secs % 3;
 	double angle = time * 10 * M_PI * 2;
 	double mag = exp(-(time - (secs - secsMod3)) * 2);
 	return sin(angle) * mag;
 }

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hal/cocoa/smslib.mm@7e26c7da4463 (annotated)

hal/cocoa/smslib.mm