1 /* 2 * NFC Digital Protocol stack 3 * Copyright (c) 2013, Intel Corporation. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 */ 15 16 #ifndef __DIGITAL_H 17 #define __DIGITAL_H 18 19 #include <net/nfc/nfc.h> 20 #include <net/nfc/digital.h> 21 22 #include <linux/crc-ccitt.h> 23 #include <linux/crc-itu-t.h> 24 25 #define PROTOCOL_ERR(req) pr_err("%d: NFC Digital Protocol error: %s\n", \ 26 __LINE__, req) 27 28 #define DIGITAL_CMD_IN_SEND 0 29 #define DIGITAL_CMD_TG_SEND 1 30 #define DIGITAL_CMD_TG_LISTEN 2 31 #define DIGITAL_CMD_TG_LISTEN_MDAA 3 32 33 #define DIGITAL_MAX_HEADER_LEN 7 34 #define DIGITAL_CRC_LEN 2 35 36 #define DIGITAL_SENSF_NFCID2_NFC_DEP_B1 0x01 37 #define DIGITAL_SENSF_NFCID2_NFC_DEP_B2 0xFE 38 39 #define DIGITAL_SENS_RES_NFC_DEP 0x0100 40 #define DIGITAL_SEL_RES_NFC_DEP 0x40 41 #define DIGITAL_SENSF_FELICA_SC 0xFFFF 42 43 #define DIGITAL_DRV_CAPS_IN_CRC(ddev) \ 44 ((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_IN_CRC) 45 #define DIGITAL_DRV_CAPS_TG_CRC(ddev) \ 46 ((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_TG_CRC) 47 48 struct digital_data_exch { 49 data_exchange_cb_t cb; 50 void *cb_context; 51 }; 52 53 struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev, 54 unsigned int len); 55 56 int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type, 57 struct sk_buff *skb, struct digital_tg_mdaa_params *params, 58 u16 timeout, nfc_digital_cmd_complete_t cmd_cb, 59 void *cb_context); 60 61 int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param); 62 static inline int digital_in_send_cmd(struct nfc_digital_dev *ddev, 63 struct sk_buff *skb, u16 timeout, 64 nfc_digital_cmd_complete_t cmd_cb, 65 void *cb_context) 66 { 67 return digital_send_cmd(ddev, DIGITAL_CMD_IN_SEND, skb, NULL, timeout, 68 cmd_cb, cb_context); 69 } 70 71 void digital_poll_next_tech(struct nfc_digital_dev *ddev); 72 73 int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech); 74 int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech); 75 int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech); 76 77 int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev, 78 struct sk_buff *skb); 79 int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev, 80 struct sk_buff *skb); 81 82 int digital_target_found(struct nfc_digital_dev *ddev, 83 struct nfc_target *target, u8 protocol); 84 85 int digital_in_recv_mifare_res(struct sk_buff *resp); 86 87 int digital_in_send_atr_req(struct nfc_digital_dev *ddev, 88 struct nfc_target *target, __u8 comm_mode, __u8 *gb, 89 size_t gb_len); 90 int digital_in_send_dep_req(struct nfc_digital_dev *ddev, 91 struct nfc_target *target, struct sk_buff *skb, 92 struct digital_data_exch *data_exch); 93 94 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param); 95 static inline int digital_tg_send_cmd(struct nfc_digital_dev *ddev, 96 struct sk_buff *skb, u16 timeout, 97 nfc_digital_cmd_complete_t cmd_cb, void *cb_context) 98 { 99 return digital_send_cmd(ddev, DIGITAL_CMD_TG_SEND, skb, NULL, timeout, 100 cmd_cb, cb_context); 101 } 102 103 void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg, 104 struct sk_buff *resp); 105 106 void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg, 107 struct sk_buff *resp); 108 109 static inline int digital_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 110 nfc_digital_cmd_complete_t cb, void *arg) 111 { 112 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN, NULL, NULL, 113 timeout, cb, arg); 114 } 115 116 void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, 117 struct sk_buff *resp); 118 119 int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb); 120 121 int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech); 122 int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech); 123 124 typedef u16 (*crc_func_t)(u16, const u8 *, size_t); 125 126 #define CRC_A_INIT 0x6363 127 #define CRC_B_INIT 0xFFFF 128 #define CRC_F_INIT 0x0000 129 130 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init, 131 u8 bitwise_inv, u8 msb_first); 132 133 static inline void digital_skb_add_crc_a(struct sk_buff *skb) 134 { 135 digital_skb_add_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0); 136 } 137 138 static inline void digital_skb_add_crc_b(struct sk_buff *skb) 139 { 140 digital_skb_add_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0); 141 } 142 143 static inline void digital_skb_add_crc_f(struct sk_buff *skb) 144 { 145 digital_skb_add_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1); 146 } 147 148 static inline void digital_skb_add_crc_none(struct sk_buff *skb) 149 { 150 return; 151 } 152 153 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func, 154 u16 crc_init, u8 bitwise_inv, u8 msb_first); 155 156 static inline int digital_skb_check_crc_a(struct sk_buff *skb) 157 { 158 return digital_skb_check_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0); 159 } 160 161 static inline int digital_skb_check_crc_b(struct sk_buff *skb) 162 { 163 return digital_skb_check_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0); 164 } 165 166 static inline int digital_skb_check_crc_f(struct sk_buff *skb) 167 { 168 return digital_skb_check_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1); 169 } 170 171 static inline int digital_skb_check_crc_none(struct sk_buff *skb) 172 { 173 return 0; 174 } 175 176 #endif /* __DIGITAL_H */ 177