Sensor.cpp revision b62013f6aafee08cfad25a2712dc32264e44f783 
1/*
2 * Copyright (C) 2010 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 <stdint.h>
18#include <sys/types.h>
19
20#include <utils/Errors.h>
21#include <utils/String8.h>
22#include <utils/Flattenable.h>
23
24#include <hardware/sensors.h>
25
26#include <gui/Sensor.h>
27
28// ----------------------------------------------------------------------------
29namespace android {
30// ----------------------------------------------------------------------------
31
32Sensor::Sensor()
33    : mHandle(0), mType(0),
34      mMinValue(0), mMaxValue(0), mResolution(0),
35      mPower(0), mMinDelay(0)
36{
37}
38
39Sensor::Sensor(struct sensor_t const* hwSensor)
40{
41    mName = hwSensor->name;
42    mVendor = hwSensor->vendor;
43    mHandle = hwSensor->handle;
44    mType = hwSensor->type;
45    mMinValue = 0;                      // FIXME: minValue
46    mMaxValue = hwSensor->maxRange;     // FIXME: maxValue
47    mResolution = hwSensor->resolution;
48    mPower = hwSensor->power;
49    mMinDelay = hwSensor->minDelay;
50}
51
52Sensor::~Sensor()
53{
54}
55
56const String8& Sensor::getName() const {
57    return mName;
58}
59
60const String8& Sensor::getVendor() const {
61    return mVendor;
62}
63
64int32_t Sensor::getHandle() const {
65    return mHandle;
66}
67
68int32_t Sensor::getType() const {
69    return mType;
70}
71
72float Sensor::getMinValue() const {
73    return mMinValue;
74}
75
76float Sensor::getMaxValue() const {
77    return mMaxValue;
78}
79
80float Sensor::getResolution() const {
81    return mResolution;
82}
83
84float Sensor::getPowerUsage() const {
85    return mPower;
86}
87
88int32_t Sensor::getMinDelay() const {
89    return mMinDelay;
90}
91
92nsecs_t Sensor::getMinDelayNs() const {
93    return getMinDelay() * 1000;
94}
95
96int32_t Sensor::getVersion() const {
97    return mVersion;
98}
99
100size_t Sensor::getFlattenedSize() const
101{
102    return  sizeof(int32_t) + ((mName.length() + 3) & ~3) +
103            sizeof(int32_t) + ((mVendor.length() + 3) & ~3) +
104            sizeof(int32_t) * 2 +
105            sizeof(float) * 4 +
106            sizeof(int32_t);
107}
108
109size_t Sensor::getFdCount() const
110{
111    return 0;
112}
113
114static inline
115size_t write(void* buffer, size_t offset, const String8& value) {
116    memcpy(static_cast<char*>(buffer) + offset, value.string(), value.length());
117    return (value.length() + 3) & ~3;
118}
119
120static inline
121size_t write(void* buffer, size_t offset, float value) {
122    *reinterpret_cast<float*>(static_cast<char*>(buffer) + offset) = value;
123    return sizeof(float);
124}
125
126static inline
127size_t write(void* buffer, size_t offset, int32_t value) {
128    *reinterpret_cast<int32_t*>(static_cast<char*>(buffer) + offset) = value;
129    return sizeof(int32_t);
130}
131
132status_t Sensor::flatten(void* buffer, size_t size,
133        int fds[], size_t count) const
134{
135    if (size < Sensor::getFlattenedSize())
136        return -ENOMEM;
137
138    size_t offset = 0;
139    offset += write(buffer, offset, int32_t(mName.length()));
140    offset += write(buffer, offset, mName);
141    offset += write(buffer, offset, int32_t(mVendor.length()));
142    offset += write(buffer, offset, mVendor);
143    offset += write(buffer, offset, mHandle);
144    offset += write(buffer, offset, mType);
145    offset += write(buffer, offset, mMinValue);
146    offset += write(buffer, offset, mMaxValue);
147    offset += write(buffer, offset, mResolution);
148    offset += write(buffer, offset, mPower);
149    offset += write(buffer, offset, mMinDelay);
150
151    return NO_ERROR;
152}
153
154static inline
155size_t read(void const* buffer, size_t offset, String8* value, int32_t len) {
156    value->setTo(static_cast<char const*>(buffer) + offset, len);
157    return (len + 3) & ~3;
158}
159
160static inline
161size_t read(void const* buffer, size_t offset, float* value) {
162    *value = *reinterpret_cast<float const*>(static_cast<char const*>(buffer) + offset);
163    return sizeof(float);
164}
165
166static inline
167size_t read(void const* buffer, size_t offset, int32_t* value) {
168    *value = *reinterpret_cast<int32_t const*>(static_cast<char const*>(buffer) + offset);
169    return sizeof(int32_t);
170}
171
172status_t Sensor::unflatten(void const* buffer, size_t size,
173        int fds[], size_t count)
174{
175    int32_t len;
176    size_t offset = 0;
177    offset += read(buffer, offset, &len);
178    offset += read(buffer, offset, &mName, len);
179    offset += read(buffer, offset, &len);
180    offset += read(buffer, offset, &mVendor, len);
181    offset += read(buffer, offset, &mHandle);
182    offset += read(buffer, offset, &mType);
183    offset += read(buffer, offset, &mMinValue);
184    offset += read(buffer, offset, &mMaxValue);
185    offset += read(buffer, offset, &mResolution);
186    offset += read(buffer, offset, &mPower);
187    offset += read(buffer, offset, &mMinDelay);
188
189    return NO_ERROR;
190}
191
192// ----------------------------------------------------------------------------
193}; // namespace android
194