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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 // This file is based on http://osxbook.com/book/bonus/chapter10/light/ | |
6 | |
7 #include "content/browser/device_sensors/ambient_light_mac.h" | |
8 | |
9 #include <utility> | |
10 | |
11 #include "base/mac/scoped_cftyperef.h" | |
12 #include "base/mac/scoped_ioobject.h" | |
13 | |
14 namespace content { | |
15 | |
16 namespace { | |
17 enum LmuFunctionIndex { | |
18 kGetSensorReadingID = 0, // getSensorReading(int *, int *) | |
19 kGetLEDBrightnessID = 1, // getLEDBrightness(int, int *) | |
20 kSetLEDBrightnessID = 2, // setLEDBrightness(int, int, int *) | |
21 kSetLEDFadeID = 3, // setLEDFade(int, int, int, int *) | |
22 }; | |
23 } // namespace | |
24 | |
25 // static | |
26 std::unique_ptr<AmbientLightSensor> AmbientLightSensor::Create() { | |
27 std::unique_ptr<AmbientLightSensor> light_sensor(new AmbientLightSensor); | |
28 return light_sensor->Init() ? std::move(light_sensor) : nullptr; | |
29 } | |
30 | |
31 AmbientLightSensor::~AmbientLightSensor() { | |
32 if (!io_connection_) | |
33 IOServiceClose(io_connection_); | |
34 } | |
35 | |
36 AmbientLightSensor::AmbientLightSensor() : io_connection_(IO_OBJECT_NULL) { | |
37 } | |
38 | |
39 bool AmbientLightSensor::Init() { | |
40 // Tested and verified by riju that the following call works on | |
41 // MacBookPro9,1 : Macbook Pro 15" (Mid 2012 model) | |
42 // MacBookPro10,1 : Macbook Pro 15" (Retina Display, Early 2013 model). | |
43 // MacBookPro10,2 : Macbook Pro 13" (Retina Display, Early 2013 model). | |
44 // MacBookAir5,2 : Macbook Air 13" (Mid 2012 model) (by François Beaufort). | |
45 // MacBookAir6,2 : Macbook Air 13" (Mid 2013 model). | |
46 // Testing plans : please download the code and follow the comments :- | |
47 // https://gist.github.com/riju/74af8c81a665e412d122/ | |
48 // and add an entry here about the model and the status returned by the code. | |
49 | |
50 // Look up a registered IOService object whose class is AppleLMUController. | |
51 base::mac::ScopedIOObject<io_service_t> service_object( | |
52 IOServiceGetMatchingService(kIOMasterPortDefault, | |
53 IOServiceMatching("AppleLMUController"))); | |
54 | |
55 // Return early if the ambient light sensor is not present. | |
56 if (!service_object) | |
57 return false; | |
58 | |
59 // Create a connection to the IOService object. | |
60 kern_return_t kr = | |
61 IOServiceOpen(service_object, mach_task_self(), 0, &io_connection_); | |
62 | |
63 // IOServiceOpen error. | |
64 if (kr != KERN_SUCCESS || io_connection_ == IO_OBJECT_NULL) | |
65 return false; | |
66 | |
67 uint64_t lux_values[2]; | |
68 return ReadSensorValue(lux_values); | |
69 } | |
70 | |
71 bool AmbientLightSensor::ReadSensorValue(uint64_t lux_values[2]) { | |
72 uint32_t scalar_output_count = 2; | |
73 kern_return_t kr = IOConnectCallMethod( | |
74 io_connection_, LmuFunctionIndex::kGetSensorReadingID, nullptr, 0, | |
75 nullptr, 0, lux_values, &scalar_output_count, nullptr, 0); | |
76 | |
77 return kr == KERN_SUCCESS; | |
78 } | |
79 | |
80 } // namespace content | |
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