1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 18 #ifndef ANDROID_NFC_HAL_INTERFACE_H 19 #define ANDROID_NFC_HAL_INTERFACE_H 20 21 #include <stdint.h> 22 #include <strings.h> 23 #include <sys/cdefs.h> 24 #include <sys/types.h> 25 26 #include <hardware/hardware.h> 27 28 __BEGIN_DECLS 29 30 #define NFC_HARDWARE_MODULE_ID "nfc" 31 32 /* 33 * Begin PN544 specific HAL 34 */ 35 #define NFC_PN544_CONTROLLER "pn544" 36 37 typedef struct nfc_module_t { 38 struct hw_module_t common; 39 } nfc_module_t; 40 41 /* 42 * PN544 linktypes. 43 * UART 44 * I2C 45 * USB (uses UART DAL) 46 */ 47 typedef enum { 48 PN544_LINK_TYPE_UART, 49 PN544_LINK_TYPE_I2C, 50 PN544_LINK_TYPE_USB, 51 PN544_LINK_TYPE_INVALID, 52 } nfc_pn544_linktype; 53 54 typedef struct { 55 struct hw_device_t common; 56 57 /* The number of EEPROM registers to write */ 58 uint32_t num_eeprom_settings; 59 60 /* The actual EEPROM settings 61 * For PN544, each EEPROM setting is a 4-byte entry, 62 * of the format [0x00, addr_msb, addr_lsb, value]. 63 */ 64 uint8_t* eeprom_settings; 65 66 /* The link type to which the PN544 is connected */ 67 nfc_pn544_linktype linktype; 68 69 /* The device node to which the PN544 is connected */ 70 const char* device_node; 71 72 /* On Crespo we had an I2C issue that would cause us to sometimes read 73 * the I2C slave address (0x57) over the bus. libnfc contains 74 * a hack to ignore this byte and try to read the length byte 75 * again. 76 * Set to 0 to disable the workaround, 1 to enable it. 77 */ 78 uint8_t enable_i2c_workaround; 79 /* I2C slave address. Multiple I2C addresses are 80 * possible for PN544 module. Configure address according to 81 * board design. 82 */ 83 uint8_t i2c_device_address; 84 } nfc_pn544_device_t; 85 86 static inline int nfc_pn544_open(const struct hw_module_t* module, 87 nfc_pn544_device_t** dev) { 88 return module->methods->open(module, NFC_PN544_CONTROLLER, 89 (struct hw_device_t**) dev); 90 } 91 92 static inline int nfc_pn544_close(nfc_pn544_device_t* dev) { 93 return dev->common.close(&dev->common); 94 } 95 /* 96 * End PN544 specific HAL 97 */ 98 99 __END_DECLS 100 101 #endif // ANDROID_NFC_HAL_INTERFACE_H 102
