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// 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 "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() ? light_sensor.Pass() : 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 Fran├žois 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