44ae5b2476
First implementation of a NFC HAL. This implementation doesn't offer a generic NFC device HAL (yet), but offers typed interfaces for different NFC controllers. Currently only the PN544 is supported. Change-Id: I3ac04dcd767fb12a433edbe88ec7068eb1930a57
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*
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* Copyright (C) 2011 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_HAL_INTERFACE_H
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#define ANDROID_NFC_HAL_INTERFACE_H
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#include <stdint.h>
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#include <strings.h>
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <hardware/hardware.h>
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__BEGIN_DECLS
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#define NFC_HARDWARE_MODULE_ID "nfc"
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/*
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* Begin PN544 specific HAL
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*/
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#define NFC_PN544_CONTROLLER "pn544"
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typedef struct nfc_module_t {
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struct hw_module_t common;
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} nfc_module_t;
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/*
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* PN544 linktypes.
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* UART
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* I2C
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* USB (uses UART DAL)
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*/
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typedef enum {
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PN544_LINK_TYPE_UART,
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PN544_LINK_TYPE_I2C,
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PN544_LINK_TYPE_USB,
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PN544_LINK_TYPE_INVALID,
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} nfc_pn544_linktype;
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typedef struct {
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struct hw_device_t common;
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/* The number of EEPROM registers to write */
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uint32_t num_eeprom_settings;
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/* The actual EEPROM settings
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* For PN544, each EEPROM setting is a 4-byte entry,
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* of the format [0x00, addr_msb, addr_lsb, value].
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*/
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uint8_t* eeprom_settings;
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/* The link type to which the PN544 is connected */
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nfc_pn544_linktype linktype;
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/* The device node to which the PN544 is connected */
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const char* device_node;
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/* On Crespo we had an I2C issue that would cause us to sometimes read
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* the I2C slave address (0x57) over the bus. libnfc contains
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* a hack to ignore this byte and try to read the length byte
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* again.
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* Set to 0 to disable the workaround, 1 to enable it.
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*/
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uint8_t enable_i2c_workaround;
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} nfc_pn544_device_t;
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static inline int nfc_pn544_open(const struct hw_module_t* module,
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nfc_pn544_device_t** dev) {
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return module->methods->open(module, NFC_PN544_CONTROLLER,
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(struct hw_device_t**) dev);
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}
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static inline int nfc_pn544_close(nfc_pn544_device_t* dev) {
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return dev->common.close(&dev->common);
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}
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/*
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* End PN544 specific HAL
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*/
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__END_DECLS
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#endif // ANDROID_NFC_HAL_INTERFACE_H
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