| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ANDROID_INCLUDE_HARDWARE_HARDWARE_H |
| #define ANDROID_INCLUDE_HARDWARE_HARDWARE_H |
| |
| #include <stdint.h> |
| #include <sys/cdefs.h> |
| |
| #include <cutils/native_handle.h> |
| #include <system/graphics.h> |
| |
| __BEGIN_DECLS |
| |
| /* |
| * Value for the hw_module_t.tag field |
| */ |
| |
| #define MAKE_TAG_CONSTANT(A,B,C,D) (((A) << 24) | ((B) << 16) | ((C) << 8) | (D)) |
| |
| #define HARDWARE_MODULE_TAG MAKE_TAG_CONSTANT('H', 'W', 'M', 'T') |
| #define HARDWARE_DEVICE_TAG MAKE_TAG_CONSTANT('H', 'W', 'D', 'T') |
| |
| struct hw_module_t; |
| struct hw_module_methods_t; |
| struct hw_device_t; |
| |
| /** |
| * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM |
| * and the fields of this data structure must begin with hw_module_t |
| * followed by module specific information. |
| */ |
| typedef struct hw_module_t { |
| /** tag must be initialized to HARDWARE_MODULE_TAG */ |
| uint32_t tag; |
| |
| /** major version number for the module */ |
| uint16_t version_major; |
| |
| /** minor version number of the module */ |
| uint16_t version_minor; |
| |
| /** Identifier of module */ |
| const char *id; |
| |
| /** Name of this module */ |
| const char *name; |
| |
| /** Author/owner/implementor of the module */ |
| const char *author; |
| |
| /** Modules methods */ |
| struct hw_module_methods_t* methods; |
| |
| /** module's dso */ |
| void* dso; |
| |
| /** padding to 128 bytes, reserved for future use */ |
| uint32_t reserved[32-7]; |
| |
| } hw_module_t; |
| |
| typedef struct hw_module_methods_t { |
| /** Open a specific device */ |
| int (*open)(const struct hw_module_t* module, const char* id, |
| struct hw_device_t** device); |
| |
| } hw_module_methods_t; |
| |
| /** |
| * Every device data structure must begin with hw_device_t |
| * followed by module specific public methods and attributes. |
| */ |
| typedef struct hw_device_t { |
| /** tag must be initialized to HARDWARE_DEVICE_TAG */ |
| uint32_t tag; |
| |
| /** version number for hw_device_t */ |
| uint32_t version; |
| |
| /** reference to the module this device belongs to */ |
| struct hw_module_t* module; |
| |
| /** padding reserved for future use */ |
| uint32_t reserved[12]; |
| |
| /** Close this device */ |
| int (*close)(struct hw_device_t* device); |
| |
| } hw_device_t; |
| |
| /** |
| * Name of the hal_module_info |
| */ |
| #define HAL_MODULE_INFO_SYM HMI |
| |
| /** |
| * Name of the hal_module_info as a string |
| */ |
| #define HAL_MODULE_INFO_SYM_AS_STR "HMI" |
| |
| /** |
| * Get the module info associated with a module by id. |
| * |
| * @return: 0 == success, <0 == error and *module == NULL |
| */ |
| int hw_get_module(const char *id, const struct hw_module_t **module); |
| |
| /** |
| * Get the module info associated with a module instance by class 'class_id' |
| * and instance 'inst'. |
| * |
| * Some modules types necessitate multiple instances. For example audio supports |
| * multiple concurrent interfaces and thus 'audio' is the module class |
| * and 'primary' or 'a2dp' are module interfaces. This implies that the files |
| * providing these modules would be named audio.primary.<variant>.so and |
| * audio.a2dp.<variant>.so |
| * |
| * @return: 0 == success, <0 == error and *module == NULL |
| */ |
| int hw_get_module_by_class(const char *class_id, const char *inst, |
| const struct hw_module_t **module); |
| |
| __END_DECLS |
| |
| #endif /* ANDROID_INCLUDE_HARDWARE_HARDWARE_H */ |