| // 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 "device/sensors/ambient_light_mac.h" |
| |
| #include <utility> |
| |
| #include "base/mac/scoped_cftyperef.h" |
| #include "base/mac/scoped_ioobject.h" |
| |
| namespace device { |
| |
| 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 |
| std::unique_ptr<AmbientLightSensor> AmbientLightSensor::Create() { |
| std::unique_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 device |