2 * NFC Digital Protocol stack
3 * Copyright (c) 2013, Intel Corporation.
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.
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
19 #include <net/nfc/nfc.h>
20 #include <net/nfc/digital.h>
22 #include <linux/crc-ccitt.h>
23 #include <linux/crc-itu-t.h>
25 #define PROTOCOL_ERR(req) pr_err("%d: NFC Digital Protocol error: %s\n", \
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
33 #define DIGITAL_MAX_HEADER_LEN 7
34 #define DIGITAL_CRC_LEN 2
36 #define DIGITAL_SENSF_NFCID2_NFC_DEP_B1 0x01
37 #define DIGITAL_SENSF_NFCID2_NFC_DEP_B2 0xFE
39 #define DIGITAL_SENS_RES_NFC_DEP 0x0100
40 #define DIGITAL_SEL_RES_NFC_DEP 0x40
41 #define DIGITAL_SENSF_FELICA_SC 0xFFFF
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)
48 struct digital_data_exch {
49 data_exchange_cb_t cb;
53 struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
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,
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,
67 return digital_send_cmd(ddev, DIGITAL_CMD_IN_SEND, skb, NULL, timeout,
71 void digital_poll_next_tech(struct nfc_digital_dev *ddev);
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);
76 int digital_target_found(struct nfc_digital_dev *ddev,
77 struct nfc_target *target, u8 protocol);
79 int digital_in_recv_mifare_res(struct sk_buff *resp);
81 int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
82 struct nfc_target *target, __u8 comm_mode, __u8 *gb,
84 int digital_in_send_dep_req(struct nfc_digital_dev *ddev,
85 struct nfc_target *target, struct sk_buff *skb,
86 struct digital_data_exch *data_exch);
88 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
89 static inline int digital_tg_send_cmd(struct nfc_digital_dev *ddev,
90 struct sk_buff *skb, u16 timeout,
91 nfc_digital_cmd_complete_t cmd_cb, void *cb_context)
93 return digital_send_cmd(ddev, DIGITAL_CMD_TG_SEND, skb, NULL, timeout,
97 void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg,
98 struct sk_buff *resp);
100 void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg,
101 struct sk_buff *resp);
103 static inline int digital_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
104 nfc_digital_cmd_complete_t cb, void *arg)
106 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN, NULL, NULL,
110 void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
111 struct sk_buff *resp);
113 int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb);
115 int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech);
116 int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech);
118 typedef u16 (*crc_func_t)(u16, const u8 *, size_t);
120 #define CRC_A_INIT 0x6363
121 #define CRC_B_INIT 0xFFFF
122 #define CRC_F_INIT 0x0000
124 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
125 u8 bitwise_inv, u8 msb_first);
127 static inline void digital_skb_add_crc_a(struct sk_buff *skb)
129 digital_skb_add_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
132 static inline void digital_skb_add_crc_b(struct sk_buff *skb)
134 digital_skb_add_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
137 static inline void digital_skb_add_crc_f(struct sk_buff *skb)
139 digital_skb_add_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
142 static inline void digital_skb_add_crc_none(struct sk_buff *skb)
147 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
148 u16 crc_init, u8 bitwise_inv, u8 msb_first);
150 static inline int digital_skb_check_crc_a(struct sk_buff *skb)
152 return digital_skb_check_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
155 static inline int digital_skb_check_crc_b(struct sk_buff *skb)
157 return digital_skb_check_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
160 static inline int digital_skb_check_crc_f(struct sk_buff *skb)
162 return digital_skb_check_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
165 static inline int digital_skb_check_crc_none(struct sk_buff *skb)
170 #endif /* __DIGITAL_H */