1 /*
2  * Copyright (C) 2017 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 #ifndef ANDROID_SENSORHAL_EXT_HIDRAW_SENSOR_H
17 #define ANDROID_SENSORHAL_EXT_HIDRAW_SENSOR_H
18 
19 #include "BaseSensorObject.h"
20 #include "HidDevice.h"
21 #include "Utils.h"
22 
23 #include <HidParser.h>
24 #include <hardware/sensors.h>
25 
26 namespace android {
27 namespace SensorHalExt {
28 
29 using HidUtil::HidParser;
30 using ReportPacket = HidParser::ReportPacket;
31 using ReportItem = HidParser::ReportItem;
32 
33 class HidRawSensor : public BaseSensorObject {
34     friend class HidRawSensorTest;
35     friend class HidRawDeviceTest;
36 public:
37     HidRawSensor(SP(HidDevice) device, uint32_t usage,
38                  const std::vector<HidParser::ReportPacket> &report);
39 
40     // implements BaseSensorObject
41     virtual const sensor_t* getSensor() const;
42     virtual void getUuid(uint8_t* uuid) const;
43     virtual int enable(bool enable);
44     virtual int batch(int64_t samplePeriod, int64_t batchPeriod); // unit nano-seconds
45 
46     // handle input report received
47     void handleInput(uint8_t id, const std::vector<uint8_t> &message);
48 
49     // indicate if the HidRawSensor is a valid one
isValid()50     bool isValid() const { return mValid; };
51 
52 private:
53 
54     // structure used for holding descriptor parse result for each report field
55     enum {
56         TYPE_FLOAT,
57         TYPE_INT64,
58         TYPE_ACCURACY
59     };
60     struct ReportTranslateRecord {
61         int type;
62         int index;
63         int64_t maxValue;
64         int64_t minValue;
65         size_t byteOffset;
66         size_t byteSize;
67         double a;
68         int64_t b;
69     };
70 
71     // sensor related information parsed from HID descriptor
72     struct FeatureValue {
73         // information needed to furnish sensor_t structure (see hardware/sensors.h)
74         std::string name;
75         std::string vendor;
76         std::string permission;
77         std::string typeString;
78         int32_t type;
79         int version;
80         float maxRange;
81         float resolution;
82         float power;
83         int32_t minDelay;
84         int64_t maxDelay;
85         size_t fifoSize;
86         size_t fifoMaxSize;
87         uint32_t reportModeFlag;
88         bool isWakeUp;
89 
90         // dynamic sensor specific
91         std::string uniqueId;
92         uint8_t uuid[16];
93 
94         // if the device is custom sensor HID device that furnished android specific descriptors
95         bool isAndroidCustom;
96     };
97 
98     // helper function to find the first report item with specified usage, type and id.
99     // if parameter id is omitted, this function looks for usage with all ids.
100     // return nullptr if nothing is found.
101     static const HidParser::ReportItem* find
102             (const std::vector<HidParser::ReportPacket> &packets,
103             unsigned int usage, int type, int id = -1);
104 
105     // helper function to decode std::string from HID feature report buffer.
106     static bool decodeString(
107             const HidParser::ReportItem &report,
108             const std::vector<uint8_t> &buffer, std::string *d);
109 
110     // initialize default feature values default based on hid device info
111     static void initFeatureValueFromHidDeviceInfo(
112             FeatureValue *featureValue, const HidDevice::HidDeviceInfo &info);
113 
114     // populates feature values from descripitors and hid feature reports
115     bool populateFeatureValueFromFeatureReport(
116             FeatureValue *featureValue, const std::vector<HidParser::ReportPacket> &packets);
117 
118     // validate feature values and construct sensor_t structure if values are ok.
119     bool validateFeatureValueAndBuildSensor();
120 
121     // helper function to find sensor control feature usage from packets
122     bool findSensorControlUsage(const std::vector<HidParser::ReportPacket> &packets);
123 
124     // try to parse sensor description feature value to see if it matches
125     // android specified custom sensor definition.
126     bool detectAndroidCustomSensor(const std::string &description);
127 
128     // process HID sensor spec defined three axis sensors usages: accel, gyro, mag.
129     bool processTriAxisUsage(const std::vector<HidParser::ReportPacket> &packets,
130             uint32_t usageX, uint32_t usageY, uint32_t usageZ, double defaultScaling = 1);
131 
132     // process HID snesor spec defined orientation(quaternion) sensor usages.
133     bool processQuaternionUsage(const std::vector<HidParser::ReportPacket> &packets);
134 
135     // dump data for test/debug purpose
136     std::string dump() const;
137 
138     // Features for control sensor
139     int mReportingStateId;
140     unsigned int mReportingStateOffset;
141 
142     int mPowerStateId;
143     unsigned int mPowerStateOffset;
144 
145     int mReportIntervalId;
146     unsigned int mReportIntervalOffset;
147     unsigned int mReportIntervalSize;
148 
149     // Input report translate table
150     std::vector<ReportTranslateRecord> mTranslateTable;
151     unsigned mInputReportId;
152 
153     FeatureValue mFeatureInfo;
154     sensor_t mSensor;
155 
156     // runtime states variable
157     bool mEnabled;
158     int64_t mSamplingPeriod;    // ns
159     int64_t mBatchingPeriod;    // ns
160 
161     WP(HidDevice) mDevice;
162     bool mValid;
163 };
164 
165 } // namespace SensorHalExt
166 } // namespace android
167 #endif // ANDROID_SENSORHAL_EXT_HIDRAW_SENSOR_H
168 
169