Sensor.cpp revision d03d9ced3fe0c115bd7af5537cdb57e94e165005 
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)
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}
50
51Sensor::~Sensor()
52{
53}
54
55const String8& Sensor::getName() const {
56    return mName;
57}
58
59const String8& Sensor::getVendor() const {
60    return mVendor;
61}
62
63int32_t Sensor::getHandle() const {
64    return mHandle;
65}
66
67int32_t Sensor::getType() const {
68    return mType;
69}
70
71float Sensor::getMinValue() const {
72    return mMinValue;
73}
74
75float Sensor::getMaxValue() const {
76    return mMaxValue;
77}
78
79float Sensor::getResolution() const {
80    return mResolution;
81}
82
83float Sensor::getPowerUsage() const {
84    return mPower;
85}
86
87size_t Sensor::getFlattenedSize() const
88{
89    return  sizeof(int32_t) + ((mName.length() + 3) & ~3) +
90            sizeof(int32_t) + ((mVendor.length() + 3) & ~3) +
91            sizeof(int32_t) * 2 +
92            sizeof(float) * 4;
93}
94
95size_t Sensor::getFdCount() const
96{
97    return 0;
98}
99
100static inline
101size_t write(void* buffer, size_t offset, const String8& value) {
102    memcpy(static_cast<char*>(buffer) + offset, value.string(), value.length());
103    return (value.length() + 3) & ~3;
104}
105
106static inline
107size_t write(void* buffer, size_t offset, float value) {
108    *reinterpret_cast<float*>(static_cast<char*>(buffer) + offset) = value;
109    return sizeof(float);
110}
111
112static inline
113size_t write(void* buffer, size_t offset, int32_t value) {
114    *reinterpret_cast<int32_t*>(static_cast<char*>(buffer) + offset) = value;
115    return sizeof(int32_t);
116}
117
118status_t Sensor::flatten(void* buffer, size_t size,
119        int fds[], size_t count) const
120{
121    if (size < Sensor::getFlattenedSize())
122        return -ENOMEM;
123
124    size_t offset = 0;
125    offset += write(buffer, offset, int32_t(mName.length()));
126    offset += write(buffer, offset, mName);
127    offset += write(buffer, offset, int32_t(mVendor.length()));
128    offset += write(buffer, offset, mVendor);
129    offset += write(buffer, offset, mHandle);
130    offset += write(buffer, offset, mType);
131    offset += write(buffer, offset, mMinValue);
132    offset += write(buffer, offset, mMaxValue);
133    offset += write(buffer, offset, mResolution);
134    offset += write(buffer, offset, mPower);
135
136    return NO_ERROR;
137}
138
139static inline
140size_t read(void const* buffer, size_t offset, String8* value, int32_t len) {
141    value->setTo(static_cast<char const*>(buffer) + offset, len);
142    return (len + 3) & ~3;
143}
144
145static inline
146size_t read(void const* buffer, size_t offset, float* value) {
147    *value = *reinterpret_cast<float const*>(static_cast<char const*>(buffer) + offset);
148    return sizeof(float);
149}
150
151static inline
152size_t read(void const* buffer, size_t offset, int32_t* value) {
153    *value = *reinterpret_cast<int32_t const*>(static_cast<char const*>(buffer) + offset);
154    return sizeof(int32_t);
155}
156
157status_t Sensor::unflatten(void const* buffer, size_t size,
158        int fds[], size_t count)
159{
160    int32_t len;
161    size_t offset = 0;
162    offset += read(buffer, offset, &len);
163    offset += read(buffer, offset, &mName, len);
164    offset += read(buffer, offset, &len);
165    offset += read(buffer, offset, &mVendor, len);
166    offset += read(buffer, offset, &mHandle);
167    offset += read(buffer, offset, &mType);
168    offset += read(buffer, offset, &mMinValue);
169    offset += read(buffer, offset, &mMaxValue);
170    offset += read(buffer, offset, &mResolution);
171    offset += read(buffer, offset, &mPower);
172
173    return NO_ERROR;
174}
175
176// ----------------------------------------------------------------------------
177}; // namespace android
178