1 /*
2 * Copyright (C) 2008 The Android Open Source Project
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 <fcntl.h>
18 #include <errno.h>
19 #include <math.h>
20 #include <poll.h>
21 #include <unistd.h>
22 #include <dirent.h>
23 #include <sys/select.h>
24
25 #include <linux/kxtf9.h>
26
27 #include <cutils/log.h>
28
29 #include "AccelerationSensor.h"
30
31 /*****************************************************************************/
32
AccelerationSensor()33 AccelerationSensor::AccelerationSensor()
34 : SensorBase(ACCELEROMETER_DEVICE_NAME, "accelerometer"),
35 mEnabled(0),
36 mOrientationEnabled(0),
37 mInputReader(32)
38 {
39 mPendingEvent.version = sizeof(sensors_event_t);
40 mPendingEvent.sensor = ID_A;
41 mPendingEvent.type = SENSOR_TYPE_ACCELEROMETER;
42 mPendingEvent.acceleration.status = SENSOR_STATUS_ACCURACY_HIGH;
43 memset(mPendingEvent.data, 0x00, sizeof(mPendingEvent.data));
44
45 open_device();
46
47 int flags = 0;
48 if (!ioctl(dev_fd, KXTF9_IOCTL_GET_ENABLE, &flags)) {
49 if (flags) {
50 mEnabled = 1;
51 }
52 }
53 if (!mEnabled) {
54 close_device();
55 }
56 }
57
~AccelerationSensor()58 AccelerationSensor::~AccelerationSensor() {
59 }
60
enable(int32_t,int en)61 int AccelerationSensor::enable(int32_t, int en)
62 {
63 int flags = en ? 1 : 0;
64 int err = 0;
65 if (flags != mEnabled) {
66 // don't turn the accelerometer off, if the orientation
67 // sensor is enabled
68 if (mOrientationEnabled && !en) {
69 mEnabled = flags;
70 return 0;
71 }
72 if (flags) {
73 open_device();
74 }
75 err = ioctl(dev_fd, KXTF9_IOCTL_SET_ENABLE, &flags);
76 err = err<0 ? -errno : 0;
77 ALOGE_IF(err, "KXTF9_IOCTL_SET_ENABLE failed (%s)", strerror(-err));
78 if (!err) {
79 mEnabled = flags;
80 }
81 if (!flags) {
82 close_device();
83 }
84 }
85 return err;
86 }
87
enableOrientation(int en)88 int AccelerationSensor::enableOrientation(int en)
89 {
90 int flags = en ? 1 : 0;
91 int err = 0;
92 if (flags != mOrientationEnabled) {
93 // don't turn the accelerometer off, if the user has requested it
94 if (mEnabled && !en) {
95 mOrientationEnabled = flags;
96 return 0;
97 }
98
99 if (flags) {
100 open_device();
101 }
102 err = ioctl(dev_fd, KXTF9_IOCTL_SET_ENABLE, &flags);
103 err = err<0 ? -errno : 0;
104 ALOGE_IF(err, "KXTF9_IOCTL_SET_ENABLE failed (%s)", strerror(-err));
105 if (!err) {
106 mOrientationEnabled = flags;
107 }
108 if (!flags) {
109 close_device();
110 }
111 }
112 return err;
113 }
114
setDelay(int32_t handle,int64_t ns)115 int AccelerationSensor::setDelay(int32_t handle, int64_t ns)
116 {
117 if (ns < 0)
118 return -EINVAL;
119
120 if (mEnabled || mOrientationEnabled) {
121 int delay = ns / 1000000;
122 if (ioctl(dev_fd, KXTF9_IOCTL_SET_DELAY, &delay)) {
123 return -errno;
124 }
125 }
126 return 0;
127 }
128
readEvents(sensors_event_t * data,int count)129 int AccelerationSensor::readEvents(sensors_event_t* data, int count)
130 {
131 if (count < 1)
132 return -EINVAL;
133
134 ssize_t n = mInputReader.fill(data_fd);
135 if (n < 0)
136 return n;
137 int numEventReceived = 0;
138 input_event const* event;
139
140 while (count && mInputReader.readEvent(&event)) {
141 int type = event->type;
142 if (type == EV_REL) {
143 processEvent(event->code, event->value);
144 } else if (type == EV_SYN) {
145 int64_t time = timevalToNano(event->time);
146 mPendingEvent.timestamp = time;
147 if (mEnabled) {
148 *data++ = mPendingEvent;
149 count--;
150 numEventReceived++;
151 }
152 // accelerometer sends valid ABS events for
153 // userspace using EVIOCGABS
154 } else if (type != EV_ABS) {
155 ALOGE("AccelerationSensor: unknown event (type=%d, code=%d)",
156 type, event->code);
157 }
158 mInputReader.next();
159 }
160
161 return numEventReceived;
162 }
163
processEvent(int code,int value)164 void AccelerationSensor::processEvent(int code, int value)
165 {
166 switch (code) {
167 case EVENT_TYPE_ACCEL_X:
168 mPendingEvent.acceleration.x = value * CONVERT_A_X;
169 break;
170 case EVENT_TYPE_ACCEL_Y:
171 mPendingEvent.acceleration.y = value * CONVERT_A_Y;
172 break;
173 case EVENT_TYPE_ACCEL_Z:
174 mPendingEvent.acceleration.z = value * CONVERT_A_Z;
175 break;
176 }
177 }
178