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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 #include "device/generic_sensor/ambient_light_reader_iio.h" | |
6 | |
7 #include "base/files/file_enumerator.h" | |
8 #include "base/files/file_util.h" | |
9 #include "base/strings/string_number_conversions.h" | |
10 #include "base/strings/string_util.h" | |
11 | |
12 namespace device { | |
13 | |
14 namespace { | |
15 | |
16 // Base path where sensors are located. | |
17 const base::FilePath::CharType kAmbientLightIioBasePath[] = | |
Mikhail
2016/10/11 14:46:46
better make it a constructor argument than hide he
maksims (do not use this acc)
2016/10/14 12:31:44
Done.
| |
18 FILE_PATH_LITERAL("/sys/bus/iio/devices"); | |
19 | |
20 } // namespace | |
21 | |
22 AmbientLightSensorReaderIio::AmbientLightSensorReaderIio() = default; | |
23 AmbientLightSensorReaderIio::~AmbientLightSensorReaderIio() = default; | |
24 | |
25 bool AmbientLightSensorReaderIio::ReadSensorLuxValue(double* lux) { | |
26 *lux = std::numeric_limits<double>::infinity(); | |
Mikhail
2016/10/11 14:46:46
you should not modify the output parameter on call
maksims (do not use this acc)
2016/10/14 12:31:44
Done.
| |
27 std::string value; | |
28 if (!base::ReadFileToString(sensor_path_, &value)) | |
Mikhail
2016/10/11 14:46:46
how do you know if 'sensor_path_' has been initial
maksims (do not use this acc)
2016/10/14 12:31:45
Right now, sensor_paths_ is a vector of path. If i
| |
29 return false; | |
30 | |
31 base::TrimWhitespaceASCII(value, base::TRIM_ALL, &value); | |
32 if (!base::StringToDouble(value, lux)) | |
33 return false; | |
34 return true; | |
35 } | |
36 | |
37 bool AmbientLightSensorReaderIio::DetectLightSensor() { | |
Mikhail
2016/10/11 14:46:46
should be renamed to smth like 'InitLightSensorPat
maksims (do not use this acc)
2016/10/14 12:31:45
Done.
| |
38 // Search the iio/devices directory for a subdirectory (eg "device0" or | |
39 // "iio:device0") that contains the "[in_]illuminance[0]_{input|raw}" file. | |
40 base::FileEnumerator dir_enumerator(base::FilePath(kAmbientLightIioBasePath), | |
41 false, base::FileEnumerator::DIRECTORIES); | |
42 const char* input_names[] = { | |
43 "in_illuminance0_input", "in_illuminance_input", "in_illuminance0_raw", | |
44 "in_illuminance_raw", "illuminance0_input", | |
45 }; | |
46 | |
47 for (base::FilePath check_path = dir_enumerator.Next(); !check_path.empty(); | |
48 check_path = dir_enumerator.Next()) { | |
49 for (unsigned int i = 0; i < arraysize(input_names); i++) { | |
Mikhail
2016/10/11 14:46:46
nit: ++i
Mikhail
2016/10/11 14:46:46
s/unsigned int/uint32_t
| |
50 base::FilePath als_path = check_path.Append(input_names[i]); | |
51 if (base::PathExists(als_path)) { | |
52 sensor_path_ = als_path; | |
53 return true; | |
54 } | |
55 } | |
56 } | |
57 return false; | |
58 } | |
59 | |
60 } // namespace content | |
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