Acces Mac OS Ambient Light Sensor

ambientLightSensor.swift

func getLux() {
    guard let serviceType = IOServiceMatching("AppleLMUController") else {
        debugPrint("No ambient light sensor")
        return
    }
    
    // get and release service
    let service = IOServiceGetMatchingService(kIOMasterPortDefault, serviceType)
    defer {
        IOObjectRelease(service)
    }
    
    // open io connection
    var dataPort: io_connect_t = 0
    guard IOServiceOpen(service, mach_task_self_, 0, &dataPort) == KERN_SUCCESS else {
        debugPrint("Coult not read ambient light sensor (1)")
        return
    }
    
    setbuf(stdout, nil)
    
    var outputs: UInt32 = 2
    let values = UnsafeMutablePointer<UInt64>.allocate(capacity: Int(outputs))
    let zero: UnsafeMutablePointer<Int> = UnsafeMutablePointer<Int>.allocate(capacity: 8)

    guard IOConnectCallMethod(dataPort, 0, nil, 0, nil, 0, values, &outputs, nil, zero) == KERN_SUCCESS else {
        debugPrint("Could not read ambient light sensor (2)")
        return
    }
    
    let value = Int(values[0])
    debugPrint("result: \(value)")
}

Recently, I wrote a software to manage the mac's appearance based on ambient light & time. This gist was the most helpful to let me access ambient light sensor. I wanted to say how much I appreciate it. Thanks a lot 👍

Did you manage to make this work on MacbookPro TouchBar?
I always have Coult not read ambient light sensor (1).
It works in other machines.