1 /* 2 * Copyright (C) 2020 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_SENSORS_IIO_UTILS_H 17 #define ANDROID_SENSORS_IIO_UTILS_H 18 19 #include <android/hardware/sensors/2.1/types.h> 20 #include <dirent.h> 21 #include <linux/ioctl.h> 22 #include <linux/types.h> 23 #include <stdint.h> 24 #include <sys/ioctl.h> 25 #include <functional> 26 27 namespace android { 28 namespace hardware { 29 namespace sensors { 30 namespace V2_1 { 31 namespace subhal { 32 namespace implementation { 33 34 using ::android::hardware::sensors::V2_1::SensorType; 35 36 extern const char* DEFAULT_IIO_DIR; 37 38 static constexpr auto DEFAULT_IIO_BUFFER_LEN = 2; 39 static constexpr auto DISABLE_CHANNEL = 0; 40 static constexpr auto ENABLE_CHANNEL = 1; 41 42 struct sensors_supported_hal { 43 std::string name; 44 SensorType type; 45 }; 46 47 struct iio_info_channel { 48 std::string name; 49 uint8_t index; 50 uint8_t storage_bytes; 51 uint8_t bits_used; 52 uint8_t shift; 53 bool big_endian; 54 bool sign; 55 }; 56 57 struct iio_device_data { 58 std::string name; 59 std::string sysfspath; 60 float resolution; 61 float scale; 62 SensorType type; 63 std::vector<iio_info_channel> channelInfo; 64 std::vector<double> sampling_freq_avl; 65 uint8_t iio_dev_num; 66 int64_t max_range; 67 }; 68 69 using DeviceFilterFunction = std::function<bool(iio_device_data*)>; 70 71 int load_iio_devices(std::string iio_dir, std::vector<iio_device_data>* iio_data, 72 DeviceFilterFunction filter); 73 int scan_elements(const std::string& device_dir, struct iio_device_data* iio_data); 74 int enable_sensor(const std::string& name, const bool flag); 75 int set_sampling_frequency(const std::string& name, const double frequency); 76 } // namespace implementation 77 } // namespace subhal 78 } // namespace V2_1 79 } // namespace sensors 80 } // namespace hardware 81 } // namespace android 82 #endif 83