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 #ifndef ANDROID_SENSOR_BASE_H 18 #define ANDROID_SENSOR_BASE_H 19 20 #include <stdint.h> 21 #include <errno.h> 22 #include <sys/cdefs.h> 23 #include <sys/types.h> 24 25 26 /*****************************************************************************/ 27 28 struct sensors_event_t; 29 30 class SensorBase { 31 protected: 32 const char* dev_name; 33 const char* data_name; 34 char input_name[PATH_MAX]; 35 int dev_fd; 36 int data_fd; 37 38 int openInput(const char* inputName); 39 static int64_t getTimestamp(); 40 41 42 static int64_t timevalToNano(timeval const& t) { 43 return t.tv_sec*1000000000LL + t.tv_usec*1000; 44 } 45 46 int open_device(); 47 int close_device(); 48 int write_int(char const *path, int value); 49 int write_sys_attribute( 50 char const *path, char const *value, int bytes); 51 52 public: 53 SensorBase( 54 const char* dev_name, 55 const char* data_name); 56 57 virtual ~SensorBase(); 58 59 virtual int readEvents(sensors_event_t* data, int count) = 0; 60 virtual bool hasPendingEvents() const; 61 virtual int getFd() const; 62 63 virtual int setDelay(int32_t handle, int64_t ns); 64 virtual int64_t getDelay(int32_t handle); 65 66 /* When this function is called, increments the reference counter. */ 67 virtual int setEnable(int32_t handle, int enabled) = 0; 68 /* It returns the number of reference. */ 69 virtual int getEnable(int32_t handle) = 0; 70 }; 71 72 /*****************************************************************************/ 73 74 #endif // ANDROID_SENSOR_BASE_H 75
