1 /*
2 * Copyright (C) 2015 Intel Corporation
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <cutils/log.h>
18 #include <hardware/sensors.h>
19 #include <errno.h>
20 #include "Sensor.hpp"
21
22 /* maximum delay: 1000ms */
23 const int64_t kMaxDelay = 1000000000;
24 /* Gravitational acceleration constant in m/s^2 */
25 const float Sensor::kGravitationalAcceleration = 9.81f;
26
Sensor()27 Sensor::Sensor() : acquisitionThread(nullptr), handle(-1), type(-1), delay(kMaxDelay) {}
28
~Sensor()29 Sensor::~Sensor() {
30 if (acquisitionThread != nullptr) {
31 delete acquisitionThread;
32 acquisitionThread = nullptr;
33 }
34 }
35
activate(int handle,int enabled)36 int Sensor::activate(int handle, int enabled) { return 0; }
37
readOneEvent(sensors_event_t * event)38 bool Sensor::readOneEvent(sensors_event_t *event) {
39 int bytes_read = 0, bytes_to_read = sizeof(sensors_event_t);
40 int fd = -1;
41 char *ptr = (char *)event;
42
43 if (acquisitionThread == nullptr) {
44 ALOGE("%s: sensor %d doesn't have an acquisition thread", __func__, handle);
45 return false;
46 }
47
48 /* read one event from the pipe read endpoint */
49 fd = acquisitionThread->getReadPipeFd();
50 do {
51 bytes_read = read(fd, ptr, bytes_to_read);
52 if (bytes_read <= 0) {
53 break;
54 }
55 bytes_to_read -= bytes_read;
56 ptr += bytes_read;
57 } while (bytes_to_read > 0);
58
59 if (bytes_to_read != 0) {
60 return false;
61 }
62
63 return true;
64 }
65
activateAcquisitionThread(int pollFd,int handle,int enabled)66 int Sensor::activateAcquisitionThread(int pollFd, int handle, int enabled) {
67 if (enabled) {
68 /* create/init acquisition thread if necessary */
69 if (acquisitionThread == nullptr) {
70 acquisitionThread = new AcquisitionThread(pollFd, this);
71 if (!acquisitionThread->init()) {
72 ALOGE("%s: Cannot initialize acquisition thread for sensor %d",
73 __func__, handle);
74 delete acquisitionThread;
75 acquisitionThread = nullptr;
76 return -1;
77 }
78 } else {
79 ALOGE("%s: Sensor %d is already enabled", __func__, handle);
80 }
81 } else {
82 /* free acquisition thread resources */
83 if (acquisitionThread != nullptr) {
84 delete acquisitionThread;
85 acquisitionThread = nullptr;
86 } else {
87 ALOGE("%s: Sensor %d is already disabled", __func__, handle);
88 }
89 }
90 return 0;
91 }
92
setDelay(int handle,int64_t requestedDelay)93 int Sensor::setDelay(int handle, int64_t requestedDelay) {
94 if (requestedDelay < 0) {
95 return -EINVAL;
96 }
97
98 if (requestedDelay > kMaxDelay) {
99 requestedDelay = kMaxDelay;
100 }
101
102 this->delay = requestedDelay;
103 /* wake up thread to immediately change the delay */
104 if (acquisitionThread != nullptr) {
105 return acquisitionThread->wakeup();
106 }
107
108 return 0;
109 }
110
batch(int handle,int flags,int64_t period_ns,int64_t timeout)111 int Sensor::batch(int handle, int flags,
112 int64_t period_ns, int64_t timeout) {
113 /* batching mode is not supported; call setDelay */
114 return setDelay(handle, period_ns);
115 }
116
flush(int handle)117 int Sensor::flush(int handle) {
118 if (acquisitionThread == nullptr) {
119 return -EINVAL;
120 }
121
122 /* batching mode is not supported; generate META_DATA_FLUSH_COMPLETE */
123 if (acquisitionThread->generateFlushCompleteEvent()) {
124 return 0;
125 }
126
127 return -1;
128 }
129