// Copyright 2015 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. // This file is based on http://osxbook.com/book/bonus/chapter10/light/ #include "content/browser/device_sensors/ambient_light_mac.h" #include <utility> #include "base/mac/scoped_cftyperef.h" #include "base/mac/scoped_ioobject.h" namespace content { namespace { enum LmuFunctionIndex { kGetSensorReadingID = 0, // getSensorReading(int *, int *) kGetLEDBrightnessID = 1, // getLEDBrightness(int, int *) kSetLEDBrightnessID = 2, // setLEDBrightness(int, int, int *) kSetLEDFadeID = 3, // setLEDFade(int, int, int, int *) }; } // namespace // static scoped_ptr<AmbientLightSensor> AmbientLightSensor::Create() { scoped_ptr<AmbientLightSensor> light_sensor(new AmbientLightSensor); return light_sensor->Init() ? std::move(light_sensor) : nullptr; } AmbientLightSensor::~AmbientLightSensor() { if (!io_connection_) IOServiceClose(io_connection_); } AmbientLightSensor::AmbientLightSensor() : io_connection_(IO_OBJECT_NULL) { } bool AmbientLightSensor::Init() { // Tested and verified by riju that the following call works on // MacBookPro9,1 : Macbook Pro 15" (Mid 2012 model) // MacBookPro10,1 : Macbook Pro 15" (Retina Display, Early 2013 model). // MacBookPro10,2 : Macbook Pro 13" (Retina Display, Early 2013 model). // MacBookAir5,2 : Macbook Air 13" (Mid 2012 model) (by François Beaufort). // MacBookAir6,2 : Macbook Air 13" (Mid 2013 model). // Testing plans : please download the code and follow the comments :- // https://gist.github.com/riju/74af8c81a665e412d122/ // and add an entry here about the model and the status returned by the code. // Look up a registered IOService object whose class is AppleLMUController. base::mac::ScopedIOObject<io_service_t> service_object( IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("AppleLMUController"))); // Return early if the ambient light sensor is not present. if (!service_object) return false; // Create a connection to the IOService object. kern_return_t kr = IOServiceOpen(service_object, mach_task_self(), 0, &io_connection_); // IOServiceOpen error. if (kr != KERN_SUCCESS || io_connection_ == IO_OBJECT_NULL) return false; uint64_t lux_values[2]; return ReadSensorValue(lux_values); } bool AmbientLightSensor::ReadSensorValue(uint64_t lux_values[2]) { uint32_t scalar_output_count = 2; kern_return_t kr = IOConnectCallMethod( io_connection_, LmuFunctionIndex::kGetSensorReadingID, nullptr, 0, nullptr, 0, lux_values, &scalar_output_count, nullptr, 0); return kr == KERN_SUCCESS; } } // namespace content