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_INCLUDE_HARDWARE_HARDWARE_H 18 #define ANDROID_INCLUDE_HARDWARE_HARDWARE_H 19 20 #include <stdint.h> 21 #include <sys/cdefs.h> 22 23 #include <cutils/native_handle.h> 24 #include <system/graphics.h> 25 26 __BEGIN_DECLS 27 28 /* 29 * Value for the hw_module_t.tag field 30 */ 31 32 #define MAKE_TAG_CONSTANT(A,B,C,D) (((A) << 24) | ((B) << 16) | ((C) << 8) | (D)) 33 34 #define HARDWARE_MODULE_TAG MAKE_TAG_CONSTANT('H', 'W', 'M', 'T') 35 #define HARDWARE_DEVICE_TAG MAKE_TAG_CONSTANT('H', 'W', 'D', 'T') 36 37 struct hw_module_t; 38 struct hw_module_methods_t; 39 struct hw_device_t; 40 41 /** 42 * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM 43 * and the fields of this data structure must begin with hw_module_t 44 * followed by module specific information. 45 */ 46 typedef struct hw_module_t { 47 /** tag must be initialized to HARDWARE_MODULE_TAG */ 48 uint32_t tag; 49 50 /** major version number for the module */ 51 uint16_t version_major; 52 53 /** minor version number of the module */ 54 uint16_t version_minor; 55 56 /** Identifier of module */ 57 const char *id; 58 59 /** Name of this module */ 60 const char *name; 61 62 /** Author/owner/implementor of the module */ 63 const char *author; 64 65 /** Modules methods */ 66 struct hw_module_methods_t* methods; 67 68 /** module's dso */ 69 void* dso; 70 71 /** padding to 128 bytes, reserved for future use */ 72 uint32_t reserved[32-7]; 73 74 } hw_module_t; 75 76 typedef struct hw_module_methods_t { 77 /** Open a specific device */ 78 int (*open)(const struct hw_module_t* module, const char* id, 79 struct hw_device_t** device); 80 81 } hw_module_methods_t; 82 83 /** 84 * Every device data structure must begin with hw_device_t 85 * followed by module specific public methods and attributes. 86 */ 87 typedef struct hw_device_t { 88 /** tag must be initialized to HARDWARE_DEVICE_TAG */ 89 uint32_t tag; 90 91 /** version number for hw_device_t */ 92 uint32_t version; 93 94 /** reference to the module this device belongs to */ 95 struct hw_module_t* module; 96 97 /** padding reserved for future use */ 98 uint32_t reserved[12]; 99 100 /** Close this device */ 101 int (*close)(struct hw_device_t* device); 102 103 } hw_device_t; 104 105 /** 106 * Name of the hal_module_info 107 */ 108 #define HAL_MODULE_INFO_SYM HMI 109 110 /** 111 * Name of the hal_module_info as a string 112 */ 113 #define HAL_MODULE_INFO_SYM_AS_STR "HMI" 114 115 /** 116 * Get the module info associated with a module by id. 117 * 118 * @return: 0 == success, <0 == error and *module == NULL 119 */ 120 int hw_get_module(const char *id, const struct hw_module_t **module); 121 122 /** 123 * Get the module info associated with a module instance by class 'class_id' 124 * and instance 'inst'. 125 * 126 * Some modules types necessitate multiple instances. For example audio supports 127 * multiple concurrent interfaces and thus 'audio' is the module class 128 * and 'primary' or 'a2dp' are module interfaces. This implies that the files 129 * providing these modules would be named audio.primary.<variant>.so and 130 * audio.a2dp.<variant>.so 131 * 132 * @return: 0 == success, <0 == error and *module == NULL 133 */ 134 int hw_get_module_by_class(const char *class_id, const char *inst, 135 const struct hw_module_t **module); 136 137 __END_DECLS 138 139 #endif /* ANDROID_INCLUDE_HARDWARE_HARDWARE_H */ 140
