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