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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "chromeos/accelerometer/accelerometer_reader.h" | 5 #include "chromeos/accelerometer/accelerometer_reader.h" |
6 | 6 |
7 #include <string> | 7 #include <string> |
8 #include <vector> | |
8 | 9 |
9 #include "base/bind.h" | 10 #include "base/bind.h" |
11 #include "base/files/file_enumerator.h" | |
10 #include "base/files/file_util.h" | 12 #include "base/files/file_util.h" |
11 #include "base/location.h" | 13 #include "base/location.h" |
12 #include "base/memory/singleton.h" | 14 #include "base/memory/singleton.h" |
13 #include "base/single_thread_task_runner.h" | 15 #include "base/single_thread_task_runner.h" |
14 #include "base/strings/string_number_conversions.h" | 16 #include "base/strings/string_number_conversions.h" |
15 #include "base/strings/string_util.h" | 17 #include "base/strings/string_util.h" |
16 #include "base/strings/stringprintf.h" | 18 #include "base/strings/stringprintf.h" |
17 #include "base/task_runner.h" | 19 #include "base/task_runner.h" |
18 #include "base/task_runner_util.h" | 20 #include "base/task_runner_util.h" |
19 #include "base/thread_task_runner_handle.h" | 21 #include "base/thread_task_runner_handle.h" |
20 #include "base/threading/platform_thread.h" | 22 #include "base/threading/platform_thread.h" |
21 #include "base/threading/sequenced_worker_pool.h" | 23 #include "base/threading/sequenced_worker_pool.h" |
22 | 24 |
23 namespace chromeos { | 25 namespace chromeos { |
24 | 26 |
25 namespace { | 27 namespace { |
26 | 28 |
27 // Paths to access necessary data from the accelerometer device. | 29 // Paths to access necessary data from the accelerometer device. |
28 const base::FilePath::CharType kAccelerometerTriggerPath[] = | 30 const base::FilePath::CharType kAccelerometerTriggerPath[] = |
29 FILE_PATH_LITERAL("/sys/bus/iio/devices/trigger0/trigger_now"); | 31 FILE_PATH_LITERAL("/sys/bus/iio/devices/trigger0/trigger_now"); |
30 const base::FilePath::CharType kAccelerometerDevicePath[] = | 32 const base::FilePath::CharType kAccelerometerDevicePath[] = |
31 FILE_PATH_LITERAL("/dev/cros-ec-accel"); | 33 FILE_PATH_LITERAL("/dev/cros-ec-accel"); |
32 const base::FilePath::CharType kAccelerometerIioBasePath[] = | 34 const base::FilePath::CharType kAccelerometerIioBasePath[] = |
33 FILE_PATH_LITERAL("/sys/bus/iio/devices/"); | 35 FILE_PATH_LITERAL("/sys/bus/iio/devices/"); |
34 | 36 |
35 // File within the device in kAccelerometerIioBasePath containing the scale of | |
36 // the accelerometers. | |
37 const base::FilePath::CharType kScaleFileName[] = "in_accel_scale"; | |
38 | |
39 // This is the per source scale file in use on kernels older than 3.18. We | 37 // This is the per source scale file in use on kernels older than 3.18. We |
40 // should remove this when all devices having accelerometers are on kernel 3.18 | 38 // should remove this when all devices having accelerometers are on kernel 3.18 |
41 // or later or have been patched to use new format: http://crbug.com/510831 | 39 // or later or have been patched to use new format: http://crbug.com/510831 |
42 const base::FilePath::CharType kSourceScaleNameFormatString[] = | 40 const base::FilePath::CharType kLegacyScaleNameFormatString[] = |
43 "in_accel_%s_scale"; | 41 "in_accel_%s_scale"; |
44 | 42 |
43 // File within kAccelerometerDevicePath/device* which denotes a single scale to | |
44 // be used across all axes. | |
45 const base::FilePath::CharType kAccelerometerScaleFileName[] = "scale"; | |
46 | |
47 // File within kAccelerometerDevicePath/device* which denotes the | |
48 // AccelerometerSource for the accelerometer. | |
49 const base::FilePath::CharType kAccelerometerLocationFileName[] = "location"; | |
50 | |
45 // The filename giving the path to read the scan index of each accelerometer | 51 // The filename giving the path to read the scan index of each accelerometer |
46 // axis. | 52 // axis. |
47 const char kAccelerometerScanIndexPath[] = | 53 const char kLegacyAccelerometerScanIndexPathFormatString[] = |
48 "scan_elements/in_accel_%s_%s_index"; | 54 "scan_elements/in_accel_%s_%s_index"; |
49 | 55 |
56 // The filename giving the path to read the scan index of each accelerometer | |
57 // when they are separate device paths. | |
58 const char kAccelerometerScanIndexPathFormatString[] = | |
59 "scan_elements/in_accel_%s_index"; | |
60 | |
50 // The names of the accelerometers. Matches up with the enum AccelerometerSource | 61 // The names of the accelerometers. Matches up with the enum AccelerometerSource |
51 // in chromeos/accelerometer/accelerometer_types.h. | 62 // in chromeos/accelerometer/accelerometer_types.h. |
52 const char kAccelerometerNames[ACCELEROMETER_SOURCE_COUNT][5] = {"lid", "base"}; | 63 const char kAccelerometerNames[ACCELEROMETER_SOURCE_COUNT][5] = {"lid", "base"}; |
53 | 64 |
54 // The axes on each accelerometer. | 65 // The axes on each accelerometer. |
flackr
2015/08/27 22:32:11
nit: Add to comment that the order of axes was fli
jonross
2015/08/27 22:59:06
Done.
| |
55 const char kAccelerometerAxes[][2] = {"y", "x", "z"}; | 66 const char kAccelerometerAxes[][2] = {"x", "y", "z"}; |
67 const char kLegacyAccelerometerAxes[][2] = {"y", "x", "z"}; | |
56 | 68 |
57 // The length required to read uint values from configuration files. | 69 // The length required to read uint values from configuration files. |
58 const size_t kMaxAsciiUintLength = 21; | 70 const size_t kMaxAsciiUintLength = 21; |
59 | 71 |
60 // The size of individual values. | 72 // The size of individual values. |
61 const size_t kDataSize = 2; | 73 const size_t kDataSize = 2; |
62 | 74 |
63 // The mean acceleration due to gravity on Earth in m/s^2. | 75 // The mean acceleration due to gravity on Earth in m/s^2. |
64 const float kMeanGravity = 9.80665f; | 76 const float kMeanGravity = 9.80665f; |
65 | 77 |
66 // The number of accelerometers. | |
67 const int kNumberOfAccelerometers = 2; | |
68 | |
69 // The number of axes for which there are acceleration readings. | 78 // The number of axes for which there are acceleration readings. |
70 const int kNumberOfAxes = 3; | 79 const int kNumberOfAxes = 3; |
71 | 80 |
72 // The size of data in one reading of the accelerometers. | 81 // The size of data in one reading of the accelerometers. |
73 const int kSizeOfReading = kDataSize * kNumberOfAccelerometers * kNumberOfAxes; | 82 const int kSizeOfReading = kDataSize * kNumberOfAxes; |
74 | 83 |
75 // Reads |path| to the unsigned int pointed to by |value|. Returns true on | 84 // Reads |path| to the unsigned int pointed to by |value|. Returns true on |
76 // success or false on failure. | 85 // success or false on failure. |
77 bool ReadFileToInt(const base::FilePath& path, int* value) { | 86 bool ReadFileToInt(const base::FilePath& path, int* value) { |
78 std::string s; | 87 std::string s; |
79 DCHECK(value); | 88 DCHECK(value); |
80 if (!base::ReadFileToString(path, &s, kMaxAsciiUintLength)) { | 89 if (!base::ReadFileToString(path, &s, kMaxAsciiUintLength)) { |
81 return false; | 90 return false; |
82 } | 91 } |
83 base::TrimWhitespaceASCII(s, base::TRIM_ALL, &s); | 92 base::TrimWhitespaceASCII(s, base::TRIM_ALL, &s); |
84 if (!base::StringToInt(s, value)) { | 93 if (!base::StringToInt(s, value)) { |
85 LOG(ERROR) << "Failed to parse \"" << s << "\" from " << path.value(); | 94 LOG(ERROR) << "Failed to parse int \"" << s << "\" from " << path.value(); |
86 return false; | 95 return false; |
87 } | 96 } |
88 return true; | 97 return true; |
98 } | |
99 | |
100 // Reads |path| to the double pointed to by |value|. Returns true on success or | |
101 // false on failure. | |
102 bool ReadFileToDouble(const base::FilePath& path, double* value) { | |
103 std::string s; | |
104 DCHECK(value); | |
105 if (!base::ReadFileToString(path, &s)) { | |
106 return false; | |
107 } | |
108 base::TrimWhitespaceASCII(s, base::TRIM_ALL, &s); | |
109 if (!base::StringToDouble(s, value)) { | |
110 LOG(ERROR) << "Failed to parse double \"" << s << "\" from " | |
111 << path.value(); | |
112 return false; | |
113 } | |
114 return true; | |
89 } | 115 } |
90 | 116 |
91 } // namespace | 117 } // namespace |
92 | 118 |
93 const int AccelerometerReader::kDelayBetweenReadsMs = 100; | 119 const int AccelerometerReader::kDelayBetweenReadsMs = 100; |
94 | 120 |
95 // Work that runs on a base::TaskRunner. It determines the accelerometer | 121 // Work that runs on a base::TaskRunner. It determines the accelerometer |
96 // configuartion, and reads the data. Upon a successful read it will notify | 122 // configuartion, and reads the data. Upon a successful read it will notify |
97 // all observers. | 123 // all observers. |
98 class AccelerometerFileReader | 124 class AccelerometerFileReader |
(...skipping 11 matching lines...) Expand all Loading... | |
110 // read at the current sampling rate. | 136 // read at the current sampling rate. |
111 void Read(); | 137 void Read(); |
112 | 138 |
113 // Add/Remove observers. | 139 // Add/Remove observers. |
114 void AddObserver(AccelerometerReader::Observer* observer); | 140 void AddObserver(AccelerometerReader::Observer* observer); |
115 void RemoveObserver(AccelerometerReader::Observer* observer); | 141 void RemoveObserver(AccelerometerReader::Observer* observer); |
116 | 142 |
117 private: | 143 private: |
118 friend class base::RefCountedThreadSafe<AccelerometerFileReader>; | 144 friend class base::RefCountedThreadSafe<AccelerometerFileReader>; |
119 | 145 |
146 // Represents necessary information in order to read an accelerometer device. | |
147 struct ReadingData { | |
148 // The full path to the accelerometer device to read. | |
149 base::FilePath path; | |
150 | |
151 // The accelerometer sources which can be read from |path|. | |
152 std::vector<AccelerometerSource> sources; | |
153 }; | |
154 | |
120 // Configuration structure for accelerometer device. | 155 // Configuration structure for accelerometer device. |
121 struct ConfigurationData { | 156 struct ConfigurationData { |
122 ConfigurationData(); | 157 ConfigurationData(); |
123 ~ConfigurationData(); | 158 ~ConfigurationData(); |
124 | 159 |
125 // Number of accelerometers on device. | 160 // Number of accelerometers on device. |
126 size_t count; | 161 size_t count; |
127 | 162 |
128 // Length of accelerometer updates. | |
129 size_t length; | |
130 | |
131 // Which accelerometers are present on device. | 163 // Which accelerometers are present on device. |
132 bool has[ACCELEROMETER_SOURCE_COUNT]; | 164 bool has[ACCELEROMETER_SOURCE_COUNT]; |
133 | 165 |
134 // Scale of accelerometers (i.e. raw value * scale = m/s^2). | 166 // Scale of accelerometers (i.e. raw value * scale = m/s^2). |
135 float scale[ACCELEROMETER_SOURCE_COUNT][3]; | 167 float scale[ACCELEROMETER_SOURCE_COUNT][3]; |
136 | 168 |
137 // Index of each accelerometer axis in data stream. | 169 // Index of each accelerometer axis in data stream. |
138 int index[ACCELEROMETER_SOURCE_COUNT][3]; | 170 int index[ACCELEROMETER_SOURCE_COUNT][3]; |
171 | |
172 // The information for each accelerometer device to be read. In kernel 3.18 | |
173 // there is one per ACCELEROMETER_SOURCE_COUNT, on 3.14 there is only one. | |
174 std::vector<ReadingData> reading_data; | |
139 }; | 175 }; |
140 | 176 |
141 ~AccelerometerFileReader() {} | 177 ~AccelerometerFileReader() {} |
142 | 178 |
179 // When accelerometers are presented as separate iio_devices this will perform | |
180 // the initialize for one of the devices, at the given |iio_path| and the | |
181 // symbolic link |name|. |location| is defined by AccelerometerSoure. | |
182 bool InitializeAccelerometer(const base::FilePath& iio_path, | |
183 const base::FilePath& name, | |
184 const std::string& location); | |
185 | |
186 // TODO(jonross): Separate the initialization into separate files. Add a gyp | |
187 // rule to have them built for the appropriate kernels. (crbug.com/525658) | |
188 // When accelerometers are presented as a single iio_device this will perform | |
189 // the initialization for both of them. | |
190 bool InitializeLegacyAccelerometers(const base::FilePath& iio_path, | |
191 const base::FilePath& name); | |
192 | |
143 // Attempts to read the accelerometer data. Upon a success, converts the raw | 193 // Attempts to read the accelerometer data. Upon a success, converts the raw |
144 // reading to an AccelerometerUpdate and notifies observers. | 194 // reading to an AccelerometerUpdate and notifies observers. |
145 void ReadFileAndNotify(); | 195 void ReadFileAndNotify(); |
146 | 196 |
147 // True if Initialize completed successfully, and there is an accelerometer | 197 // True if Initialize completed successfully, and there is an accelerometer |
148 // file to read. | 198 // file to read. |
149 bool initialization_successful_; | 199 bool initialization_successful_; |
150 | 200 |
151 // The accelerometer configuration. | 201 // The accelerometer configuration. |
152 ConfigurationData configuration_; | 202 ConfigurationData configuration_; |
(...skipping 19 matching lines...) Expand all Loading... | |
172 | 222 |
173 void AccelerometerFileReader::Initialize( | 223 void AccelerometerFileReader::Initialize( |
174 scoped_refptr<base::SequencedTaskRunner> sequenced_task_runner) { | 224 scoped_refptr<base::SequencedTaskRunner> sequenced_task_runner) { |
175 DCHECK( | 225 DCHECK( |
176 base::SequencedWorkerPool::GetSequenceTokenForCurrentThread().IsValid()); | 226 base::SequencedWorkerPool::GetSequenceTokenForCurrentThread().IsValid()); |
177 task_runner_ = sequenced_task_runner; | 227 task_runner_ = sequenced_task_runner; |
178 | 228 |
179 // Check for accelerometer symlink which will be created by the udev rules | 229 // Check for accelerometer symlink which will be created by the udev rules |
180 // file on detecting the device. | 230 // file on detecting the device. |
181 base::FilePath device; | 231 base::FilePath device; |
182 if (!base::ReadSymbolicLink(base::FilePath(kAccelerometerDevicePath), | 232 |
183 &device)) { | 233 if (base::IsDirectoryEmpty(base::FilePath(kAccelerometerDevicePath))) { |
234 LOG(ERROR) << "Accelerometer device directory is empty at " | |
235 << kAccelerometerDevicePath; | |
184 return; | 236 return; |
185 } | 237 } |
186 | 238 |
187 if (!base::PathExists(base::FilePath(kAccelerometerTriggerPath))) { | 239 if (!base::PathExists(base::FilePath(kAccelerometerTriggerPath))) { |
188 LOG(ERROR) << "Accelerometer trigger does not exist at" | 240 LOG(ERROR) << "Accelerometer trigger does not exist at" |
189 << kAccelerometerTriggerPath; | 241 << kAccelerometerTriggerPath; |
190 return; | 242 return; |
191 } | 243 } |
192 | 244 |
193 base::FilePath iio_path(base::FilePath(kAccelerometerIioBasePath).Append( | 245 base::FileEnumerator symlink_dir(base::FilePath(kAccelerometerDevicePath), |
194 device)); | 246 false, base::FileEnumerator::FILES); |
195 | 247 bool separate_devices = false; |
flackr
2015/08/27 22:32:11
nit: s/separate_devices/legacy_cros_accel
jonross
2015/08/27 22:59:06
Done.
| |
196 // Read the scale for all axes. | 248 for (base::FilePath name = symlink_dir.Next(); !name.empty(); |
197 int scale_divisor = 0; | 249 name = symlink_dir.Next()) { |
198 bool per_source_scale = | 250 base::FilePath iio_device; |
199 !ReadFileToInt(iio_path.Append(kScaleFileName), &scale_divisor); | 251 if (!base::ReadSymbolicLink(name, &iio_device)) { |
200 if (!per_source_scale && scale_divisor == 0) { | 252 LOG(ERROR) << "Failed to read symbolic link " << kAccelerometerDevicePath |
201 LOG(ERROR) << "Accelerometer " << kScaleFileName | 253 << "/" << name.MaybeAsASCII() << "\n"; |
202 << "has scale of 0 and will not be used."; | 254 return; |
203 return; | |
204 } | |
205 | |
206 // Read configuration of each accelerometer axis from each accelerometer from | |
207 // /sys/bus/iio/devices/iio:deviceX/. | |
208 for (size_t i = 0; i < arraysize(kAccelerometerNames); ++i) { | |
209 if (per_source_scale) { | |
210 configuration_.has[i] = false; | |
211 // Read scale of accelerometer. | |
212 std::string accelerometer_scale_path = base::StringPrintf( | |
213 kSourceScaleNameFormatString, kAccelerometerNames[i]); | |
214 if (!ReadFileToInt(iio_path.Append(accelerometer_scale_path.c_str()), | |
215 &scale_divisor)) { | |
216 continue; | |
217 } | |
218 if (scale_divisor == 0) { | |
219 LOG(ERROR) << "Accelerometer " << accelerometer_scale_path | |
220 << "has scale of 0 and will not be used."; | |
221 continue; | |
222 } | |
223 } | 255 } |
224 | 256 |
225 configuration_.has[i] = true; | 257 base::FilePath iio_path(base::FilePath(kAccelerometerIioBasePath) |
226 for (size_t j = 0; j < arraysize(kAccelerometerAxes); ++j) { | 258 .Append(iio_device.BaseName())); |
227 configuration_.scale[i][j] = kMeanGravity / scale_divisor; | 259 std::string location; |
228 std::string accelerometer_index_path = base::StringPrintf( | 260 separate_devices = base::ReadFileToString( |
229 kAccelerometerScanIndexPath, kAccelerometerAxes[j], | 261 base::FilePath(iio_path).Append(kAccelerometerLocationFileName), |
230 kAccelerometerNames[i]); | 262 &location); |
231 if (!ReadFileToInt(iio_path.Append(accelerometer_index_path.c_str()), | 263 if (separate_devices) { |
232 &(configuration_.index[i][j]))) { | 264 base::TrimWhitespaceASCII(location, base::TRIM_ALL, &location); |
233 configuration_.has[i] = false; | 265 if (!InitializeAccelerometer(iio_path, name, location)) |
234 break; | 266 return; |
235 } | 267 } else { |
268 if (!InitializeLegacyAccelerometers(iio_path, name)) | |
269 return; | |
236 } | 270 } |
237 if (configuration_.has[i]) | |
238 configuration_.count++; | |
239 } | |
240 | |
241 // Adjust the directions of accelerometers to match the AccelerometerUpdate | |
242 // type specified in chromeos/accelerometer/accelerometer_types.h. | |
243 configuration_.scale[ACCELEROMETER_SOURCE_SCREEN][0] *= -1.0f; | |
244 for (int i = 0; i < 3; ++i) { | |
245 configuration_.scale[ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD][i] *= -1.0f; | |
246 } | 271 } |
247 | 272 |
248 // Verify indices are within bounds. | 273 // Verify indices are within bounds. |
249 for (int i = 0; i < ACCELEROMETER_SOURCE_COUNT; ++i) { | 274 for (int i = 0; i < ACCELEROMETER_SOURCE_COUNT; ++i) { |
250 if (!configuration_.has[i]) | 275 if (!configuration_.has[i]) |
251 continue; | 276 continue; |
252 for (int j = 0; j < 3; ++j) { | 277 for (int j = 0; j < 3; ++j) { |
253 if (configuration_.index[i][j] < 0 || | 278 if (configuration_.index[i][j] < 0 || |
254 configuration_.index[i][j] >= | 279 configuration_.index[i][j] >= |
255 3 * static_cast<int>(configuration_.count)) { | 280 3 * static_cast<int>(configuration_.count)) { |
281 const char* axis = separate_devices ? kAccelerometerAxes[j] | |
282 : kLegacyAccelerometerAxes[j]; | |
256 LOG(ERROR) << "Field index for " << kAccelerometerNames[i] << " " | 283 LOG(ERROR) << "Field index for " << kAccelerometerNames[i] << " " |
257 << kAccelerometerAxes[j] << " axis out of bounds."; | 284 << axis << " axis out of bounds."; |
258 return; | 285 return; |
259 } | 286 } |
260 } | 287 } |
261 } | 288 } |
262 configuration_.length = kDataSize * 3 * configuration_.count; | 289 |
263 initialization_successful_ = true; | 290 initialization_successful_ = true; |
264 Read(); | 291 Read(); |
265 } | 292 } |
266 | 293 |
267 void AccelerometerFileReader::Read() { | 294 void AccelerometerFileReader::Read() { |
268 DCHECK( | 295 DCHECK( |
269 base::SequencedWorkerPool::GetSequenceTokenForCurrentThread().IsValid()); | 296 base::SequencedWorkerPool::GetSequenceTokenForCurrentThread().IsValid()); |
270 ReadFileAndNotify(); | 297 ReadFileAndNotify(); |
271 task_runner_->PostNonNestableDelayedTask( | 298 task_runner_->PostNonNestableDelayedTask( |
272 FROM_HERE, base::Bind(&AccelerometerFileReader::Read, this), | 299 FROM_HERE, base::Bind(&AccelerometerFileReader::Read, this), |
273 base::TimeDelta::FromMilliseconds( | 300 base::TimeDelta::FromMilliseconds( |
274 AccelerometerReader::kDelayBetweenReadsMs)); | 301 AccelerometerReader::kDelayBetweenReadsMs)); |
275 } | 302 } |
276 | 303 |
277 void AccelerometerFileReader::AddObserver( | 304 void AccelerometerFileReader::AddObserver( |
278 AccelerometerReader::Observer* observer) { | 305 AccelerometerReader::Observer* observer) { |
279 observers_->AddObserver(observer); | 306 observers_->AddObserver(observer); |
280 if (initialization_successful_) { | 307 if (initialization_successful_) { |
281 task_runner_->PostNonNestableTask( | 308 task_runner_->PostNonNestableTask( |
282 FROM_HERE, | 309 FROM_HERE, |
283 base::Bind(&AccelerometerFileReader::ReadFileAndNotify, this)); | 310 base::Bind(&AccelerometerFileReader::ReadFileAndNotify, this)); |
284 } | 311 } |
285 } | 312 } |
286 | 313 |
287 void AccelerometerFileReader::RemoveObserver( | 314 void AccelerometerFileReader::RemoveObserver( |
288 AccelerometerReader::Observer* observer) { | 315 AccelerometerReader::Observer* observer) { |
289 observers_->RemoveObserver(observer); | 316 observers_->RemoveObserver(observer); |
290 } | 317 } |
291 | 318 |
319 bool AccelerometerFileReader::InitializeAccelerometer( | |
320 const base::FilePath& iio_path, | |
321 const base::FilePath& name, | |
322 const std::string& location) { | |
323 size_t config_index = 0; | |
324 for (; config_index < arraysize(kAccelerometerNames); ++config_index) { | |
325 if (location == kAccelerometerNames[config_index]) | |
326 break; | |
327 } | |
328 | |
329 if (config_index >= arraysize(kAccelerometerNames)) { | |
330 LOG(ERROR) << "Unrecognized location: " << location << " for device " | |
331 << name.MaybeAsASCII() << "\n"; | |
332 return false; | |
333 } | |
334 | |
335 double scale; | |
336 if (!ReadFileToDouble(iio_path.Append(kAccelerometerScaleFileName), &scale)) | |
337 return false; | |
338 | |
339 const int kNumberAxes = arraysize(kAccelerometerAxes); | |
340 for (size_t i = 0; i < kNumberAxes; ++i) { | |
341 std::string accelerometer_index_path = base::StringPrintf( | |
342 kAccelerometerScanIndexPathFormatString, kAccelerometerAxes[i]); | |
343 if (!ReadFileToInt(iio_path.Append(accelerometer_index_path.c_str()), | |
344 &(configuration_.index[config_index][i]))) { | |
345 LOG(ERROR) << "Index file " << accelerometer_index_path | |
346 << " could not be parsed\n"; | |
347 return false; | |
348 } | |
349 configuration_.scale[config_index][i] = scale; | |
350 } | |
351 configuration_.has[config_index] = true; | |
352 configuration_.count++; | |
353 | |
354 ReadingData reading_data; | |
355 reading_data.path = | |
356 base::FilePath(kAccelerometerDevicePath).Append(name.BaseName()); | |
357 reading_data.sources.push_back( | |
358 static_cast<AccelerometerSource>(config_index)); | |
359 | |
360 configuration_.reading_data.push_back(reading_data); | |
361 | |
362 return true; | |
363 } | |
364 | |
365 bool AccelerometerFileReader::InitializeLegacyAccelerometers( | |
366 const base::FilePath& iio_path, | |
367 const base::FilePath& name) { | |
368 ReadingData reading_data; | |
369 reading_data.path = | |
370 base::FilePath(kAccelerometerDevicePath).Append(name.BaseName()); | |
371 // Read the scale for all axes. | |
372 int scale_divisor = 0; | |
flackr
2015/08/27 22:32:11
nit: Move declaration to for loop scope right befo
jonross
2015/08/27 22:59:06
Done.
| |
373 // Read configuration of each accelerometer axis from each accelerometer from | |
374 // /sys/bus/iio/devices/iio:deviceX/. | |
375 for (size_t i = 0; i < arraysize(kAccelerometerNames); ++i) { | |
376 configuration_.has[i] = false; | |
377 // Read scale of accelerometer. | |
378 std::string accelerometer_scale_path = base::StringPrintf( | |
379 kLegacyScaleNameFormatString, kAccelerometerNames[i]); | |
380 if (!ReadFileToInt(iio_path.Append(accelerometer_scale_path.c_str()), | |
381 &scale_divisor)) { | |
382 continue; | |
383 } | |
384 if (scale_divisor == 0) { | |
385 LOG(ERROR) << "Accelerometer " << accelerometer_scale_path | |
386 << "has scale of 0 and will not be used."; | |
387 continue; | |
388 } | |
389 | |
390 configuration_.has[i] = true; | |
391 for (size_t j = 0; j < arraysize(kLegacyAccelerometerAxes); ++j) { | |
392 configuration_.scale[i][j] = kMeanGravity / scale_divisor; | |
393 std::string accelerometer_index_path = base::StringPrintf( | |
394 kLegacyAccelerometerScanIndexPathFormatString, | |
395 kLegacyAccelerometerAxes[j], kAccelerometerNames[i]); | |
396 if (!ReadFileToInt(iio_path.Append(accelerometer_index_path.c_str()), | |
397 &(configuration_.index[i][j]))) { | |
398 configuration_.has[i] = false; | |
399 LOG(ERROR) << "Index file " << accelerometer_index_path | |
400 << " could not be parsed\n"; | |
401 return false; | |
402 } | |
403 } | |
404 if (configuration_.has[i]) { | |
405 configuration_.count++; | |
406 reading_data.sources.push_back(static_cast<AccelerometerSource>(i)); | |
407 } | |
408 } | |
409 | |
410 // Adjust the directions of accelerometers to match the AccelerometerUpdate | |
411 // type specified in chromeos/accelerometer/accelerometer_types.h. | |
412 configuration_.scale[ACCELEROMETER_SOURCE_SCREEN][1] *= -1.0f; | |
413 configuration_.scale[ACCELEROMETER_SOURCE_SCREEN][2] *= -1.0f; | |
414 | |
415 configuration_.reading_data.push_back(reading_data); | |
416 return true; | |
417 } | |
418 | |
292 void AccelerometerFileReader::ReadFileAndNotify() { | 419 void AccelerometerFileReader::ReadFileAndNotify() { |
293 DCHECK(initialization_successful_); | 420 DCHECK(initialization_successful_); |
294 char reading[kSizeOfReading]; | |
295 | 421 |
296 // Initiate the trigger to read accelerometers simultaneously | 422 // Initiate the trigger to read accelerometers simultaneously |
297 int bytes_written = base::WriteFile( | 423 int bytes_written = base::WriteFile( |
298 base::FilePath(kAccelerometerTriggerPath), "1\n", 2); | 424 base::FilePath(kAccelerometerTriggerPath), "1\n", 2); |
299 if (bytes_written < 2) { | 425 if (bytes_written < 2) { |
300 PLOG(ERROR) << "Accelerometer trigger failure: " << bytes_written; | 426 PLOG(ERROR) << "Accelerometer trigger failure: " << bytes_written; |
301 return; | 427 return; |
302 } | 428 } |
303 | 429 |
304 // Read resulting sample from /dev/cros-ec-accel. | 430 // Read resulting sample from /dev/cros-ec-accel. |
305 int bytes_read = base::ReadFile(base::FilePath(kAccelerometerDevicePath), | |
306 reading, configuration_.length); | |
307 if (bytes_read < static_cast<int>(configuration_.length)) { | |
308 LOG(ERROR) << "Read " << bytes_read << " byte(s), expected " | |
309 << configuration_.length << " bytes from accelerometer"; | |
310 return; | |
311 } | |
312 | |
313 update_ = new AccelerometerUpdate(); | 431 update_ = new AccelerometerUpdate(); |
314 | 432 for (auto reading_data : configuration_.reading_data) { |
315 for (int i = 0; i < ACCELEROMETER_SOURCE_COUNT; ++i) { | 433 int reading_size = reading_data.sources.size() * kSizeOfReading; |
316 if (!configuration_.has[i]) | 434 DCHECK_GT(reading_size, 0); |
317 continue; | 435 char reading[reading_size]; |
318 | 436 int bytes_read = base::ReadFile(reading_data.path, reading, reading_size); |
319 int16* values = reinterpret_cast<int16*>(reading); | 437 if (bytes_read < reading_size) { |
320 update_->Set( | 438 LOG(ERROR) << "Accelerometer Read " << bytes_read << " byte(s), expected " |
321 static_cast<AccelerometerSource>(i), | 439 << reading_size << " bytes from accelerometer " |
322 values[configuration_.index[i][0]] * configuration_.scale[i][0], | 440 << reading_data.path.MaybeAsASCII(); |
323 values[configuration_.index[i][1]] * configuration_.scale[i][1], | 441 return; |
324 values[configuration_.index[i][2]] * configuration_.scale[i][2]); | 442 } |
443 for (AccelerometerSource source : reading_data.sources) { | |
444 if (!configuration_.has[source]) | |
445 continue; | |
446 int16* values = reinterpret_cast<int16*>(reading); | |
447 update_->Set(source, values[configuration_.index[source][0]] * | |
448 configuration_.scale[source][0], | |
449 values[configuration_.index[source][1]] * | |
450 configuration_.scale[source][1], | |
451 values[configuration_.index[source][2]] * | |
452 configuration_.scale[source][2]); | |
453 } | |
325 } | 454 } |
326 | 455 |
327 observers_->Notify(FROM_HERE, | 456 observers_->Notify(FROM_HERE, |
328 &AccelerometerReader::Observer::OnAccelerometerUpdated, | 457 &AccelerometerReader::Observer::OnAccelerometerUpdated, |
329 update_); | 458 update_); |
330 } | 459 } |
331 | 460 |
332 AccelerometerFileReader::ConfigurationData::ConfigurationData() : count(0) { | 461 AccelerometerFileReader::ConfigurationData::ConfigurationData() : count(0) { |
333 for (int i = 0; i < ACCELEROMETER_SOURCE_COUNT; ++i) { | 462 for (int i = 0; i < ACCELEROMETER_SOURCE_COUNT; ++i) { |
334 has[i] = false; | 463 has[i] = false; |
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367 } | 496 } |
368 | 497 |
369 AccelerometerReader::AccelerometerReader() | 498 AccelerometerReader::AccelerometerReader() |
370 : accelerometer_file_reader_(new AccelerometerFileReader()) { | 499 : accelerometer_file_reader_(new AccelerometerFileReader()) { |
371 } | 500 } |
372 | 501 |
373 AccelerometerReader::~AccelerometerReader() { | 502 AccelerometerReader::~AccelerometerReader() { |
374 } | 503 } |
375 | 504 |
376 } // namespace chromeos | 505 } // namespace chromeos |
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