1 /* 2 * Copyright (C) 2018 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 #pragma once 18 19 #include <cstdint> 20 21 #define MAKE_TAG_CONSTANT(A, B, C, D) (((A) << 24) | ((B) << 16) | ((C) << 8) | (D)) 22 23 #define HARDWARE_MODULE_TAG MAKE_TAG_CONSTANT('H', 'W', 'M', 'T') 24 #define HARDWARE_DEVICE_TAG MAKE_TAG_CONSTANT('H', 'W', 'D', 'T') 25 26 #define HARDWARE_MAKE_API_VERSION(maj, min) ((((maj)&0xff) << 8) | ((min)&0xff)) 27 28 #define HARDWARE_HAL_API_VERSION HARDWARE_MAKE_API_VERSION(1, 0) 29 30 struct hw_module_methods_t; 31 32 struct hw_module_t { 33 uint32_t tag; 34 uint16_t module_api_version; 35 uint16_t hal_api_version; 36 const char* id; 37 const char* name; 38 const char* author; 39 hw_module_methods_t* methods; 40 void* dso; 41 #ifdef __LP64__ 42 uint64_t reserved[32 - 7]; 43 #else 44 uint32_t reserved[32 - 7]; 45 #endif 46 }; 47 48 struct hw_device_t { 49 uint32_t tag; 50 uint32_t version; 51 struct hw_module_t* module; 52 #ifdef __LP64__ 53 uint64_t reserved[12]; 54 #else 55 uint32_t reserved[12]; 56 #endif 57 int (*close)(hw_device_t* device); 58 }; 59 60 struct hw_module_methods_t { 61 int (*open)(const hw_module_t*, const char*, hw_device_t**); 62 }; 63 64 extern "C" { 65 int hw_get_module(const char* id, const hw_module_t** module); 66 }; 67
