96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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* Copyright (C) 2013 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_NFC_TAG_HAL_INTERFACE_H
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#define ANDROID_NFC_TAG_HAL_INTERFACE_H
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#include <stdint.h>
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#include <hardware/hardware.h>
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__BEGIN_DECLS
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/*
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* HAL for programmable NFC tags.
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*
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*/
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#define NFC_TAG_HARDWARE_MODULE_ID "nfc_tag"
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#define NFC_TAG_ID "tag"
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typedef struct nfc_tag_module_t {
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/**
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* Common methods of the NFC tag module. This *must* be the first member of
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* nfc_tag_module_t as users of this structure will cast a hw_module_t to
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* nfc_tag_module_t pointer in contexts where it's known the hw_module_t references a
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* nfc_tag_module_t.
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*/
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struct hw_module_t common;
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} nfc_tag_module_t;
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typedef struct nfc_tag_device {
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/**
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* Common methods of the NFC tag device. This *must* be the first member of
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* nfc_tag_device_t as users of this structure will cast a hw_device_t to
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* nfc_tag_device_t pointer in contexts where it's known the hw_device_t references a
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* nfc_tag_device_t.
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*/
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struct hw_device_t common;
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/**
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* Initialize the NFC tag.
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*
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* The driver must:
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* * Set the static lock bytes to read only
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* * Configure the Capability Container to disable write acess
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* eg: 0xE1 0x10 <size> 0x0F
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*
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* This function is called once before any calls to setContent().
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*
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* Return 0 on success or -errno on error.
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*/
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int (*init)(const struct nfc_tag_device *dev);
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/**
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* Set the NFC tag content.
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*
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* The driver must write <data> in the data area of the tag starting at
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* byte 0 of block 4 and zero the rest of the data area.
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*
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* Returns 0 on success or -errno on error.
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*/
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int (*setContent)(const struct nfc_tag_device *dev, const uint8_t *data, size_t len);
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/**
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* Returns the memory size of the data area.
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*/
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int (*getMemorySize)(const struct nfc_tag_device *dev);
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} nfc_tag_device_t;
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static inline int nfc_tag_open(const struct hw_module_t* module,
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nfc_tag_device_t** dev) {
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return module->methods->open(module, NFC_TAG_ID,
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(struct hw_device_t**)dev);
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}
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static inline int nfc_tag_close(nfc_tag_device_t* dev) {
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return dev->common.close(&dev->common);
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}
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__END_DECLS
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#endif // ANDROID_NFC_TAG_HAL_INTERFACE_H
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