feat(telemetry): implement power, voltage, and current telemetry provider (fixes #19)

Sources/Bridging/MacMonitor-Bridging-Header.h

@@ -18,5 +18,6 @@
 #import "MMCPUThermalProvider.h"
 #import "MMFanTelemetryProvider.h"
 #import "MMComponentThermalProvider.h"
+#import "MMPowerTelemetryProvider.h"
 
 #endif /* MacMonitor_Bridging_Header_h */

Sources/Hardware/AppleSMC/MMSMCParser.m

@@ -40,6 +40,13 @@
            (uint32_t)bytes[3];
 }
 
+static int hexDigitValue(unichar c) {
+    if (c >= '0' && c <= '9') return c - '0';
+    if (c >= 'a' && c <= 'f') return c - 'a' + 10;
+    if (c >= 'A' && c <= 'F') return c - 'A' + 10;
+    return -1;
+}
+
 + (nullable NSNumber *)decodeValueWithDataType:(NSString *)dataType bytes:(const uint8_t *)bytes size:(NSUInteger)size {
     if (!bytes || size == 0) return nil;
     
@@ -49,7 +56,7 @@
         if (size >= 2) return @([self decodeSP78:bytes]);
     } else if ([trimmedType isEqualToString:@"fpe2"]) {
         if (size >= 2) return @([self decodeFPE2:bytes]);
-    } else if ([trimmedType isEqualToString:@"flt"]) {
+    } else if ([trimmedType isEqualToString:@"flt"] || [trimmedType isEqualToString:@"ioft"]) {
         if (size >= 4) return @([self decodeFLT:bytes]);
     } else if ([trimmedType isEqualToString:@"ui8"]) {
         if (size >= 1) return @([self decodeUI8:bytes]);
@@ -59,6 +66,18 @@
         if (size >= 4) return @([self decodeUI32:bytes]);
     } else if ([trimmedType isEqualToString:@"flag"]) {
         if (size >= 1) return @(bytes[0] != 0);
+    } else if (trimmedType.length == 4 && [trimmedType hasPrefix:@"sp"] && size >= 2) {
+        int fracBits = hexDigitValue([trimmedType characterAtIndex:3]);
+        if (fracBits >= 0 && fracBits <= 15) {
+            int16_t raw = (int16_t)(((uint16_t)bytes[0] << 8) | (uint16_t)bytes[1]);
+            return @((float)raw / (float)(1 << fracBits));
+        }
+    } else if (trimmedType.length == 4 && [trimmedType hasPrefix:@"fp"] && size >= 2) {
+        int fracBits = hexDigitValue([trimmedType characterAtIndex:3]);
+        if (fracBits >= 0 && fracBits <= 15) {
+            uint16_t raw = ((uint16_t)bytes[0] << 8) | (uint16_t)bytes[1];
+            return @((float)raw / (float)(1 << fracBits));
+        }
     }
     
     return nil;

Sources/Telemetry/Power/MMPowerTelemetryProvider.h

@@ -0,0 +1,45 @@
+#ifndef MMPowerTelemetryProvider_h
+#define MMPowerTelemetryProvider_h
+
+#import <Foundation/Foundation.h>
+#import "MMTelemetryProvider.h"
+#import "MMAppleSMCClient.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * MMPowerTelemetryProvider
+ * Samples system power draw, CPU/GPU package wattage, rail voltages, and currents
+ * via AppleSMC and AppleSmartBattery IOKit interfaces.
+ */
+@interface MMPowerTelemetryProvider : NSObject <MMTelemetryProvider>
+
+@property (nonatomic, strong, readonly) MMAppleSMCClient *smcClient;
+@property (nonatomic, readonly) NSArray<NSString *> *discoveredPowerKeys;
+@property (nonatomic, readonly) NSArray<NSString *> *discoveredVoltageKeys;
+@property (nonatomic, readonly) NSArray<NSString *> *discoveredCurrentKeys;
+
+- (instancetype)init;
+- (instancetype)initWithSMCClient:(MMAppleSMCClient *)client;
+
+/**
+ * Friendly name for power, voltage, and current SMC keys.
+ */
++ (NSString *)humanReadableNameForKey:(NSString *)key;
+
+/**
+ * Unit of measurement for SMC key ("W", "V", "A").
+ */
++ (NSString *)unitForKey:(NSString *)key;
+
+/**
+ * Pure calculator method for deterministic unit testing.
+ */
++ (NSDictionary<NSString *, id> *)calculatePowerMetricsWithReadings:(NSDictionary<NSString *, NSNumber *> *)readings
+                                                        batteryInfo:(nullable NSDictionary<NSString *, id> *)batteryInfo;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif /* MMPowerTelemetryProvider_h */

Sources/Telemetry/Power/MMPowerTelemetryProvider.m

@@ -0,0 +1,314 @@
+#import "MMPowerTelemetryProvider.h"
+#import <IOKit/IOKitLib.h>
+#import <IOKit/ps/IOPowerSources.h>
+#import <IOKit/ps/IOPSKeys.h>
+
+@interface MMPowerTelemetryProvider () {
+    MMAppleSMCClient *_smcClient;
+    NSMutableArray<NSString *> *_discoveredPowerKeys;
+    NSMutableArray<NSString *> *_discoveredVoltageKeys;
+    NSMutableArray<NSString *> *_discoveredCurrentKeys;
+    BOOL _probed;
+}
+@end
+
+@implementation MMPowerTelemetryProvider
+
+- (instancetype)init {
+    return [self initWithSMCClient:[MMAppleSMCClient sharedClient]];
+}
+
+- (instancetype)initWithSMCClient:(MMAppleSMCClient *)client {
+    self = [super init];
+    if (self) {
+        _smcClient = client;
+        _discoveredPowerKeys = [NSMutableArray array];
+        _discoveredVoltageKeys = [NSMutableArray array];
+        _discoveredCurrentKeys = [NSMutableArray array];
+        [self probeSensors];
+    }
+    return self;
+}
+
+- (void)probeSensors {
+    if (!_smcClient.isAvailable) return;
+    
+    NSArray<NSString *> *powerCandidates = @[
+        @"PSTR", @"PDTR", @"PCPR", @"PCTR", @"PC0C", @"PCPT",
+        @"PG0R", @"PGTR", @"PMSR", @"PM0R", @"PCPC"
+    ];
+    
+    NSArray<NSString *> *voltageCandidates = @[
+        @"VC0C", @"VD0R", @"VN0C", @"VM0R", @"VP0R"
+    ];
+    
+    NSArray<NSString *> *currentCandidates = @[
+        @"IC0C", @"ID0R", @"IG0C", @"IM0R"
+    ];
+    
+    [_discoveredPowerKeys removeAllObjects];
+    for (NSString *key in powerCandidates) {
+        NSNumber *val = [_smcClient readNumericValueForKey:key error:nil];
+        if (val && [val doubleValue] > 0.0 && [val doubleValue] < 5000.0) {
+            [_discoveredPowerKeys addObject:key];
+        }
+    }
+    
+    [_discoveredVoltageKeys removeAllObjects];
+    for (NSString *key in voltageCandidates) {
+        NSNumber *val = [_smcClient readNumericValueForKey:key error:nil];
+        if (val && [val doubleValue] > 0.0) {
+            [_discoveredVoltageKeys addObject:key];
+        }
+    }
+    
+    [_discoveredCurrentKeys removeAllObjects];
+    for (NSString *key in currentCandidates) {
+        NSNumber *val = [_smcClient readNumericValueForKey:key error:nil];
+        if (val && [val doubleValue] > 0.0) {
+            [_discoveredCurrentKeys addObject:key];
+        }
+    }
+    
+    _probed = YES;
+}
+
+- (MMTelemetryDomain)domain {
+    return MMTelemetryDomainPower;
+}
+
+- (NSString *)providerIdentifier {
+    return @"com.i3omb.macmonitor.telemetry.power";
+}
+
+- (BOOL)isAvailable {
+    return _smcClient.isAvailable;
+}
+
+- (MMAppleSMCClient *)smcClient {
+    return _smcClient;
+}
+
+- (NSArray<NSString *> *)discoveredPowerKeys {
+    return [_discoveredPowerKeys copy];
+}
+
+- (NSArray<NSString *> *)discoveredVoltageKeys {
+    return [_discoveredVoltageKeys copy];
+}
+
+- (NSArray<NSString *> *)discoveredCurrentKeys {
+    return [_discoveredCurrentKeys copy];
+}
+
++ (NSString *)unitForKey:(NSString *)key {
+    if ([key hasPrefix:@"P"]) return @"W";
+    if ([key hasPrefix:@"V"]) return @"V";
+    if ([key hasPrefix:@"I"]) return @"A";
+    return @"";
+}
+
++ (NSString *)humanReadableNameForKey:(NSString *)key {
+    static NSDictionary<NSString *, NSString *> *names = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        names = @{
+            @"PSTR": @"Total System Power",
+            @"PDTR": @"DC-In Total Power",
+            @"PCPR": @"CPU Package Power",
+            @"PCTR": @"CPU Total Power",
+            @"PC0C": @"CPU Core Power",
+            @"PCPT": @"CPU Package Total Power",
+            @"PG0R": @"GPU 0 Power",
+            @"PGTR": @"GPU Total Power",
+            @"PMSR": @"Memory Subsystem Power",
+            @"PM0R": @"Memory Rail Power",
+            @"PCPC": @"Power Supply In / AC",
+            @"VC0C": @"CPU Core Voltage",
+            @"VD0R": @"DC-In Rail Voltage",
+            @"VN0C": @"PCH Rail Voltage",
+            @"VM0R": @"Memory Rail Voltage",
+            @"VP0R": @"Power Supply Voltage",
+            @"IC0C": @"CPU Core Current",
+            @"ID0R": @"DC-In Rail Current",
+            @"IG0C": @"GPU Rail Current",
+            @"IM0R": @"Memory Rail Current"
+        };
+    });
+    
+    NSString *match = names[key];
+    return match ?: key;
+}
+
++ (NSDictionary<NSString *, id> *)calculatePowerMetricsWithReadings:(NSDictionary<NSString *, NSNumber *> *)readings
+                                                        batteryInfo:(nullable NSDictionary<NSString *, id> *)batteryInfo {
+    // Determine system total power
+    double systemTotal = 0.0;
+    if (readings[@"PSTR"]) {
+        systemTotal = [readings[@"PSTR"] doubleValue];
+    } else if (readings[@"PDTR"]) {
+        systemTotal = [readings[@"PDTR"] doubleValue];
+    } else if (batteryInfo[@"batteryWatts"]) {
+        systemTotal = [batteryInfo[@"batteryWatts"] doubleValue];
+    }
+    
+    // CPU wattage
+    double cpuWatts = 0.0;
+    if (readings[@"PCPR"]) {
+        cpuWatts = [readings[@"PCPR"] doubleValue];
+    } else if (readings[@"PCTR"]) {
+        cpuWatts = [readings[@"PCTR"] doubleValue];
+    } else if (readings[@"PC0C"]) {
+        cpuWatts = [readings[@"PC0C"] doubleValue];
+    } else if (readings[@"PCPT"]) {
+        cpuWatts = [readings[@"PCPT"] doubleValue];
+    }
+    
+    // Voltage & Current
+    double cpuVoltage = readings[@"VC0C"] ? [readings[@"VC0C"] doubleValue] : 0.0;
+    double cpuCurrent = readings[@"IC0C"] ? [readings[@"IC0C"] doubleValue] : 0.0;
+    
+    // Fallback: calculate cpuWatts from V * I if SMC didn't provide direct wattage
+    if (cpuWatts == 0.0 && cpuVoltage > 0.0 && cpuCurrent > 0.0) {
+        cpuWatts = cpuVoltage * cpuCurrent;
+    }
+    
+    // GPU wattage
+    double gpuWatts = 0.0;
+    if (readings[@"PG0R"]) {
+        gpuWatts = [readings[@"PG0R"] doubleValue];
+    } else if (readings[@"PGTR"]) {
+        gpuWatts = [readings[@"PGTR"] doubleValue];
+    }
+    
+    // Memory wattage
+    double memoryWatts = 0.0;
+    if (readings[@"PMSR"]) {
+        memoryWatts = [readings[@"PMSR"] doubleValue];
+    } else if (readings[@"PM0R"]) {
+        memoryWatts = [readings[@"PM0R"] doubleValue];
+    }
+    
+    // Collect all individual sensor entries
+    NSMutableArray<NSDictionary<NSString *, id> *> *sensors = [NSMutableArray arrayWithCapacity:readings.count];
+    NSArray<NSString *> *sortedKeys = [readings.allKeys sortedArrayUsingSelector:@selector(compare:)];
+    for (NSString *k in sortedKeys) {
+        double val = [readings[k] doubleValue];
+        [sensors addObject:@{
+            @"key": k,
+            @"name": [self humanReadableNameForKey:k],
+            @"value": @(val),
+            @"unit": [self unitForKey:k]
+        }];
+    }
+    
+    NSString *powerSource = batteryInfo[@"powerSource"] ?: @"AC Power";
+    BOOL isCharging = [batteryInfo[@"isCharging"] boolValue];
+    double batteryLevel = [batteryInfo[@"batteryLevel"] doubleValue];
+    
+    return @{
+        @"systemTotalWatts": @(systemTotal),
+        @"cpuWatts": @(cpuWatts),
+        @"gpuWatts": @(gpuWatts),
+        @"memoryWatts": @(memoryWatts),
+        @"cpuVoltage": @(cpuVoltage),
+        @"cpuCurrent": @(cpuCurrent),
+        @"powerSource": powerSource,
+        @"isCharging": @(isCharging),
+        @"batteryLevel": @(batteryLevel),
+        @"sensors": sensors
+    };
+}
+
+- (nullable NSDictionary<NSString *, id> *)sampleBatteryInfo {
+    CFTypeRef psInfo = IOPSCopyPowerSourcesInfo();
+    if (!psInfo) return nil;
+    
+    CFArrayRef psList = IOPSCopyPowerSourcesList(psInfo);
+    if (!psList) {
+        CFRelease(psInfo);
+        return nil;
+    }
+    
+    NSString *stateStr = @"AC Power";
+    BOOL isCharging = NO;
+    double capacity = 100.0;
+    
+    if (CFArrayGetCount(psList) > 0) {
+        CFTypeRef ps = CFArrayGetValueAtIndex(psList, 0);
+        CFDictionaryRef desc = IOPSGetPowerSourceDescription(psInfo, ps);
+        if (desc) {
+            NSDictionary *dict = (__bridge NSDictionary *)desc;
+            stateStr = dict[@"Power Source State"] ?: @"AC Power";
+            isCharging = [dict[@"Is Charging"] boolValue];
+            if (dict[@"Current Capacity"]) {
+                capacity = [dict[@"Current Capacity"] doubleValue];
+            }
+        }
+    }
+    CFRelease(psList);
+    CFRelease(psInfo);
+    
+    // Sample AppleSmartBattery for instantaneous voltage and current
+    double batteryWatts = 0.0;
+    double batteryVoltage = 0.0;
+    double batteryAmperage = 0.0;
+    
+    io_service_t service = IOServiceGetMatchingService(kIOMainPortDefault, IOServiceMatching("AppleSmartBattery"));
+    if (service != IO_OBJECT_NULL) {
+        CFMutableDictionaryRef props = NULL;
+        if (IORegistryEntryCreateCFProperties(service, &props, kCFAllocatorDefault, 0) == KERN_SUCCESS && props) {
+            NSDictionary *dict = (__bridge NSDictionary *)props;
+            double v_mV = [dict[@"Voltage"] doubleValue];
+            double a_mA = dict[@"InstantAmperage"] ? [dict[@"InstantAmperage"] doubleValue] : [dict[@"Amperage"] doubleValue];
+            
+            batteryVoltage = v_mV / 1000.0;
+            batteryAmperage = fabs(a_mA) / 1000.0;
+            batteryWatts = batteryVoltage * batteryAmperage;
+            
+            CFRelease(props);
+        }
+        IOObjectRelease(service);
+    }
+    
+    return @{
+        @"powerSource": stateStr,
+        @"isCharging": @(isCharging),
+        @"batteryLevel": @(capacity),
+        @"batteryVoltage": @(batteryVoltage),
+        @"batteryAmperage": @(batteryAmperage),
+        @"batteryWatts": @(batteryWatts)
+    };
+}
+
+- (nullable NSDictionary<NSString *, id> *)sampleTelemetryWithError:(NSError **)error {
+    if (!_probed && _smcClient.isAvailable) {
+        [self probeSensors];
+    }
+    
+    NSMutableDictionary<NSString *, NSNumber *> *readings = [NSMutableDictionary dictionary];
+    
+    NSMutableArray<NSString *> *allKeys = [NSMutableArray arrayWithArray:_discoveredPowerKeys];
+    [allKeys addObjectsFromArray:_discoveredVoltageKeys];
+    [allKeys addObjectsFromArray:_discoveredCurrentKeys];
+    
+    for (NSString *key in allKeys) {
+        NSNumber *val = [_smcClient readNumericValueForKey:key error:nil];
+        if (val) {
+            double v = [val doubleValue];
+            // Normalize mV or mA if values appear raw
+            if ([key hasPrefix:@"V"] && v > 100.0) {
+                v /= 1000.0;
+            } else if ([key hasPrefix:@"I"] && v > 500.0) {
+                v /= 1000.0;
+            }
+            readings[key] = @(v);
+        }
+    }
+    
+    NSDictionary<NSString *, id> *batteryInfo = [self sampleBatteryInfo];
+    return [MMPowerTelemetryProvider calculatePowerMetricsWithReadings:readings
+                                                           batteryInfo:batteryInfo];
+}
+
+@end

Tests/MMPowerTests.swift

@@ -0,0 +1,101 @@
+import XCTest
+@testable import MacMonitor
+
+final class MMPowerTests: XCTestCase {
+    
+    func testUnitsAndNames() {
+        XCTAssertEqual(MMPowerTelemetryProvider.unit(forKey: "PSTR"), "W")
+        XCTAssertEqual(MMPowerTelemetryProvider.unit(forKey: "VC0C"), "V")
+        XCTAssertEqual(MMPowerTelemetryProvider.unit(forKey: "IC0C"), "A")
+        XCTAssertEqual(MMPowerTelemetryProvider.unit(forKey: "UNKNOWN"), "")
+        
+        XCTAssertEqual(MMPowerTelemetryProvider.humanReadableName(forKey: "PSTR"), "Total System Power")
+        XCTAssertEqual(MMPowerTelemetryProvider.humanReadableName(forKey: "VC0C"), "CPU Core Voltage")
+        XCTAssertEqual(MMPowerTelemetryProvider.humanReadableName(forKey: "IC0C"), "CPU Core Current")
+    }
+    
+    func testPowerMetricsCalculationFromSMC() {
+        let readings: [String: NSNumber] = [
+            "PSTR": NSNumber(value: 45.2),
+            "PCPR": NSNumber(value: 28.4),
+            "PG0R": NSNumber(value: 8.5),
+            "PMSR": NSNumber(value: 3.1),
+            "VC0C": NSNumber(value: 1.15),
+            "IC0C": NSNumber(value: 24.5)
+        ]
+        
+        let batteryInfo: [String: Any] = [
+            "powerSource": "AC Power",
+            "isCharging": false,
+            "batteryLevel": 100.0,
+            "batteryWatts": 0.0
+        ]
+        
+        let metrics = MMPowerTelemetryProvider.calculatePowerMetrics(
+            withReadings: readings,
+            batteryInfo: batteryInfo
+        )
+        
+        let systemWatts = metrics["systemTotalWatts"] as? Double ?? 0
+        let cpuWatts = metrics["cpuWatts"] as? Double ?? 0
+        let gpuWatts = metrics["gpuWatts"] as? Double ?? 0
+        let memWatts = metrics["memoryWatts"] as? Double ?? 0
+        let cpuV = metrics["cpuVoltage"] as? Double ?? 0
+        let cpuI = metrics["cpuCurrent"] as? Double ?? 0
+        let powerSource = metrics["powerSource"] as? String ?? ""
+        let sensors = metrics["sensors"] as? [[String: Any]] ?? []
+        
+        XCTAssertEqual(systemWatts, 45.2, accuracy: 0.1)
+        XCTAssertEqual(cpuWatts, 28.4, accuracy: 0.1)
+        XCTAssertEqual(gpuWatts, 8.5, accuracy: 0.1)
+        XCTAssertEqual(memWatts, 3.1, accuracy: 0.1)
+        XCTAssertEqual(cpuV, 1.15, accuracy: 0.01)
+        XCTAssertEqual(cpuI, 24.5, accuracy: 0.1)
+        XCTAssertEqual(powerSource, "AC Power")
+        XCTAssertEqual(sensors.count, 6)
+    }
+    
+    func testBatteryFallbackCalculation() {
+        // No PSTR, no PCPR, but VC0C and IC0C are present
+        let readings: [String: NSNumber] = [
+            "VC0C": NSNumber(value: 1.2),
+            "IC0C": NSNumber(value: 10.0)
+        ]
+        
+        let batteryInfo: [String: Any] = [
+            "powerSource": "Battery Power",
+            "isCharging": false,
+            "batteryLevel": 75.0,
+            "batteryWatts": 18.5
+        ]
+        
+        let metrics = MMPowerTelemetryProvider.calculatePowerMetrics(
+            withReadings: readings,
+            batteryInfo: batteryInfo
+        )
+        
+        let systemWatts = metrics["systemTotalWatts"] as? Double ?? 0
+        let cpuWatts = metrics["cpuWatts"] as? Double ?? 0
+        let powerSource = metrics["powerSource"] as? String ?? ""
+        let isCharging = metrics["isCharging"] as? Bool ?? true
+        
+        // System watts falls back to batteryWatts (18.5)
+        XCTAssertEqual(systemWatts, 18.5, accuracy: 0.1)
+        // CPU watts calculated from V * I = 1.2 * 10.0 = 12.0 W
+        XCTAssertEqual(cpuWatts, 12.0, accuracy: 0.1)
+        XCTAssertEqual(powerSource, "Battery Power")
+        XCTAssertFalse(isCharging)
+    }
+    
+    func testLivePowerProvider() throws {
+        let provider = MMPowerTelemetryProvider()
+        XCTAssertEqual(provider.domain, .power)
+        XCTAssertEqual(provider.providerIdentifier, "com.i3omb.macmonitor.telemetry.power")
+        
+        let sample = try provider.sampleTelemetry()
+        XCTAssertNotNil(sample)
+        XCTAssertNotNil(sample["systemTotalWatts"])
+        XCTAssertNotNil(sample["powerSource"])
+        XCTAssertNotNil(sample["sensors"])
+    }
+}