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 #define DIGITAL_CMD_TG_LISTEN_MD 4 33 34 #define DIGITAL_MAX_HEADER_LEN 7 35 #define DIGITAL_CRC_LEN 2 36 37 #define DIGITAL_SENSF_NFCID2_NFC_DEP_B1 0x01 38 #define DIGITAL_SENSF_NFCID2_NFC_DEP_B2 0xFE 39 40 #define DIGITAL_SENS_RES_NFC_DEP 0x0100 41 #define DIGITAL_SEL_RES_NFC_DEP 0x40 42 #define DIGITAL_SENSF_FELICA_SC 0xFFFF 43 44 #define DIGITAL_DRV_CAPS_IN_CRC(ddev) \ 45 ((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_IN_CRC) 46 #define DIGITAL_DRV_CAPS_TG_CRC(ddev) \ 47 ((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_TG_CRC) 48 49 struct digital_data_exch { 50 data_exchange_cb_t cb; 51 void *cb_context; 52 }; 53 54 struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev, 55 unsigned int len); 56 57 int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type, 58 struct sk_buff *skb, struct digital_tg_mdaa_params *params, 59 u16 timeout, nfc_digital_cmd_complete_t cmd_cb, 60 void *cb_context); 61 62 int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param); 63 static inline int digital_in_send_cmd(struct nfc_digital_dev *ddev, 64 struct sk_buff *skb, u16 timeout, 65 nfc_digital_cmd_complete_t cmd_cb, 66 void *cb_context) 67 { 68 return digital_send_cmd(ddev, DIGITAL_CMD_IN_SEND, skb, NULL, timeout, 69 cmd_cb, cb_context); 70 } 71 72 void digital_poll_next_tech(struct nfc_digital_dev *ddev); 73 74 int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech); 75 int digital_in_send_sensb_req(struct nfc_digital_dev *ddev, u8 rf_tech); 76 int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech); 77 int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech); 78 79 int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev, 80 struct sk_buff *skb); 81 int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev, 82 struct sk_buff *skb); 83 84 int digital_target_found(struct nfc_digital_dev *ddev, 85 struct nfc_target *target, u8 protocol); 86 87 int digital_in_recv_mifare_res(struct sk_buff *resp); 88 89 int digital_in_send_atr_req(struct nfc_digital_dev *ddev, 90 struct nfc_target *target, __u8 comm_mode, __u8 *gb, 91 size_t gb_len); 92 int digital_in_send_dep_req(struct nfc_digital_dev *ddev, 93 struct nfc_target *target, struct sk_buff *skb, 94 struct digital_data_exch *data_exch); 95 96 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param); 97 static inline int digital_tg_send_cmd(struct nfc_digital_dev *ddev, 98 struct sk_buff *skb, u16 timeout, 99 nfc_digital_cmd_complete_t cmd_cb, void *cb_context) 100 { 101 return digital_send_cmd(ddev, DIGITAL_CMD_TG_SEND, skb, NULL, timeout, 102 cmd_cb, cb_context); 103 } 104 105 void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg, 106 struct sk_buff *resp); 107 108 void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg, 109 struct sk_buff *resp); 110 111 static inline int digital_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 112 nfc_digital_cmd_complete_t cb, void *arg) 113 { 114 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN, NULL, NULL, 115 timeout, cb, arg); 116 } 117 118 void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, 119 struct sk_buff *resp); 120 121 int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb); 122 123 int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech); 124 int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech); 125 void digital_tg_recv_md_req(struct nfc_digital_dev *ddev, void *arg, 126 struct sk_buff *resp); 127 128 typedef u16 (*crc_func_t)(u16, const u8 *, size_t); 129 130 #define CRC_A_INIT 0x6363 131 #define CRC_B_INIT 0xFFFF 132 #define CRC_F_INIT 0x0000 133 134 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init, 135 u8 bitwise_inv, u8 msb_first); 136 137 static inline void digital_skb_add_crc_a(struct sk_buff *skb) 138 { 139 digital_skb_add_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0); 140 } 141 142 static inline void digital_skb_add_crc_b(struct sk_buff *skb) 143 { 144 digital_skb_add_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0); 145 } 146 147 static inline void digital_skb_add_crc_f(struct sk_buff *skb) 148 { 149 digital_skb_add_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1); 150 } 151 152 static inline void digital_skb_add_crc_none(struct sk_buff *skb) 153 { 154 return; 155 } 156 157 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func, 158 u16 crc_init, u8 bitwise_inv, u8 msb_first); 159 160 static inline int digital_skb_check_crc_a(struct sk_buff *skb) 161 { 162 return digital_skb_check_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0); 163 } 164 165 static inline int digital_skb_check_crc_b(struct sk_buff *skb) 166 { 167 return digital_skb_check_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0); 168 } 169 170 static inline int digital_skb_check_crc_f(struct sk_buff *skb) 171 { 172 return digital_skb_check_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1); 173 } 174 175 static inline int digital_skb_check_crc_none(struct sk_buff *skb) 176 { 177 return 0; 178 } 179 180 #endif /* __DIGITAL_H */ 181