Initial import of NFC GNSS SDK project
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chenjintao
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/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_INCLUDE_HARDWARE_HARDWARE_H
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#define ANDROID_INCLUDE_HARDWARE_HARDWARE_H
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/*
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* Value for the hw_module_t.tag field
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*/
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#define MAKE_TAG_CONSTANT(A,B,C,D) (((A) << 24) | ((B) << 16) | ((C) << 8) | (D))
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#define HARDWARE_MODULE_TAG MAKE_TAG_CONSTANT('H', 'W', 'M', 'T')
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#define HARDWARE_DEVICE_TAG MAKE_TAG_CONSTANT('H', 'W', 'D', 'T')
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#define HARDWARE_MAKE_API_VERSION(maj,min) \
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((((maj) & 0xff) << 8) | ((min) & 0xff))
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#define HARDWARE_MAKE_API_VERSION_2(maj,min,hdr) \
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((((maj) & 0xff) << 24) | (((min) & 0xff) << 16) | ((hdr) & 0xffff))
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#define HARDWARE_API_VERSION_2_MAJ_MIN_MASK 0xffff0000
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#define HARDWARE_API_VERSION_2_HEADER_MASK 0x0000ffff
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/*
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* The current HAL API version.
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*
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* All module implementations must set the hw_module_t.hal_api_version field
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* to this value when declaring the module with HAL_MODULE_INFO_SYM.
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*
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* Note that previous implementations have always set this field to 0.
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* Therefore, libhardware HAL API will always consider versions 0.0 and 1.0
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* to be 100% binary compatible.
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*
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*/
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#define HARDWARE_HAL_API_VERSION HARDWARE_MAKE_API_VERSION(1, 0)
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/*
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* Helper macros for module implementors.
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*
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* The derived modules should provide convenience macros for supported
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* versions so that implementations can explicitly specify module/device
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* versions at definition time.
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*
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* Use this macro to set the hw_module_t.module_api_version field.
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*/
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#define HARDWARE_MODULE_API_VERSION(maj,min) HARDWARE_MAKE_API_VERSION(maj,min)
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#define HARDWARE_MODULE_API_VERSION_2(maj,min,hdr) HARDWARE_MAKE_API_VERSION_2(maj,min,hdr)
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/*
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* Use this macro to set the hw_device_t.version field
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*/
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#define HARDWARE_DEVICE_API_VERSION(maj,min) HARDWARE_MAKE_API_VERSION(maj,min)
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#define HARDWARE_DEVICE_API_VERSION_2(maj,min,hdr) HARDWARE_MAKE_API_VERSION_2(maj,min,hdr)
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struct hw_module_t;
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struct hw_module_methods_t;
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struct hw_device_t;
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/**
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* Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
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* and the fields of this data structure must begin with hw_module_t
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* followed by module specific information.
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*/
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typedef struct hw_module_t {
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/** tag must be initialized to HARDWARE_MODULE_TAG */
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uint32_t tag;
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/**
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* The API version of the implemented module. The module owner is
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* responsible for updating the version when a module interface has
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* changed.
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*
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* The derived modules such as gralloc and audio own and manage this field.
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* The module user must interpret the version field to decide whether or
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* not to inter-operate with the supplied module implementation.
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* For example, SurfaceFlinger is responsible for making sure that
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* it knows how to manage different versions of the gralloc-module API,
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* and AudioFlinger must know how to do the same for audio-module API.
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*
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* The module API version should include a major and a minor component.
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* For example, version 1.0 could be represented as 0x0100. This format
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* implies that versions 0x0100-0x01ff are all API-compatible.
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*
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* In the future, libhardware will expose a hw_get_module_version()
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* (or equivalent) function that will take minimum/maximum supported
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* versions as arguments and would be able to reject modules with
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* versions outside of the supplied range.
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*/
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uint16_t module_api_version;
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#define version_major module_api_version
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/**
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* version_major/version_minor defines are supplied here for temporary
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* source code compatibility. They will be removed in the next version.
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* ALL clients must convert to the new version format.
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*/
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/**
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* The API version of the HAL module interface. This is meant to
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* version the hw_module_t, hw_module_methods_t, and hw_device_t
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* structures and definitions.
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*
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* The HAL interface owns this field. Module users/implementations
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* must NOT rely on this value for version information.
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*
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* Presently, 0 is the only valid value.
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*/
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uint16_t hal_api_version;
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#define version_minor hal_api_version
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/** Identifier of module */
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const char *id;
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/** Name of this module */
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const char *name;
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/** Author/owner/implementor of the module */
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const char *author;
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/** Modules methods */
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struct hw_module_methods_t* methods;
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/** module's dso */
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void* dso;
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#ifdef __LP64__
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uint64_t reserved[32-7];
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#else
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/** padding to 128 bytes, reserved for future use */
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uint32_t reserved[32-7];
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#endif
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} hw_module_t;
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typedef struct hw_module_methods_t {
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/** Open a specific device */
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int (*open)(const struct hw_module_t* module, const char* id,
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struct hw_device_t** device);
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} hw_module_methods_t;
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/**
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* Every device data structure must begin with hw_device_t
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* followed by module specific public methods and attributes.
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*/
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typedef struct hw_device_t {
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/** tag must be initialized to HARDWARE_DEVICE_TAG */
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uint32_t tag;
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/**
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* Version of the module-specific device API. This value is used by
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* the derived-module user to manage different device implementations.
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*
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* The module user is responsible for checking the module_api_version
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* and device version fields to ensure that the user is capable of
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* communicating with the specific module implementation.
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*
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* One module can support multiple devices with different versions. This
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* can be useful when a device interface changes in an incompatible way
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* but it is still necessary to support older implementations at the same
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* time. One such example is the Camera 2.0 API.
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*
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* This field is interpreted by the module user and is ignored by the
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* HAL interface itself.
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*/
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uint32_t version;
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/** reference to the module this device belongs to */
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struct hw_module_t* module;
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/** padding reserved for future use */
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#ifdef __LP64__
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uint64_t reserved[12];
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#else
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uint32_t reserved[12];
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#endif
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/** Close this device */
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int (*close)(struct hw_device_t* device);
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} hw_device_t;
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/**
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* Name of the hal_module_info
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*/
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#define HAL_MODULE_INFO_SYM HMI
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/**
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* Name of the hal_module_info as a string
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*/
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#define HAL_MODULE_INFO_SYM_AS_STR "HMI"
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/**
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* Get the module info associated with a module by id.
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*
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* @return: 0 == success, <0 == error and *module == NULL
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*/
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int hw_get_module(const char *id, const struct hw_module_t **module);
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/**
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* Get the module info associated with a module instance by class 'class_id'
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* and instance 'inst'.
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*
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* Some modules types necessitate multiple instances. For example audio supports
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* multiple concurrent interfaces and thus 'audio' is the module class
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* and 'primary' or 'a2dp' are module interfaces. This implies that the files
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* providing these modules would be named audio.primary.<variant>.so and
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* audio.a2dp.<variant>.so
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*
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* @return: 0 == success, <0 == error and *module == NULL
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*/
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int hw_get_module_by_class(const char *class_id, const char *inst,
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const struct hw_module_t **module);
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#endif /* ANDROID_INCLUDE_HARDWARE_HARDWARE_H */
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