1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * NFC Digital Protocol stack
4 * Copyright (c) 2013, Intel Corporation.
5 */
6
7 #ifndef __DIGITAL_H
8 #define __DIGITAL_H
9
10 #include <net/nfc/nfc.h>
11 #include <net/nfc/digital.h>
12
13 #include <linux/crc-ccitt.h>
14 #include <linux/crc-itu-t.h>
15
16 #define PROTOCOL_ERR(req) pr_err("%d: NFC Digital Protocol error: %s\n", \
17 __LINE__, req)
18
19 #define DIGITAL_CMD_IN_SEND 0
20 #define DIGITAL_CMD_TG_SEND 1
21 #define DIGITAL_CMD_TG_LISTEN 2
22 #define DIGITAL_CMD_TG_LISTEN_MDAA 3
23 #define DIGITAL_CMD_TG_LISTEN_MD 4
24
25 #define DIGITAL_MAX_HEADER_LEN 7
26 #define DIGITAL_CRC_LEN 2
27
28 #define DIGITAL_SENSF_NFCID2_NFC_DEP_B1 0x01
29 #define DIGITAL_SENSF_NFCID2_NFC_DEP_B2 0xFE
30
31 #define DIGITAL_SENS_RES_NFC_DEP 0x0100
32 #define DIGITAL_SEL_RES_NFC_DEP 0x40
33 #define DIGITAL_SENSF_FELICA_SC 0xFFFF
34
35 #define DIGITAL_DRV_CAPS_IN_CRC(ddev) \
36 ((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_IN_CRC)
37 #define DIGITAL_DRV_CAPS_TG_CRC(ddev) \
38 ((ddev)->driver_capabilities & NFC_DIGITAL_DRV_CAPS_TG_CRC)
39
40 struct digital_data_exch {
41 data_exchange_cb_t cb;
42 void *cb_context;
43 };
44
45 struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
46 unsigned int len);
47
48 int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
49 struct sk_buff *skb, struct digital_tg_mdaa_params *params,
50 u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
51 void *cb_context);
52
53 int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
54 static inline int digital_in_send_cmd(struct nfc_digital_dev *ddev,
55 struct sk_buff *skb, u16 timeout,
56 nfc_digital_cmd_complete_t cmd_cb,
57 void *cb_context)
58 {
59 return digital_send_cmd(ddev, DIGITAL_CMD_IN_SEND, skb, NULL, timeout,
60 cmd_cb, cb_context);
61 }
62
63 void digital_poll_next_tech(struct nfc_digital_dev *ddev);
64
65 int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech);
66 int digital_in_send_sensb_req(struct nfc_digital_dev *ddev, u8 rf_tech);
67 int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech);
68 int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech);
69
70 int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev,
71 struct sk_buff *skb);
72 int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev,
73 struct sk_buff *skb);
74
75 int digital_target_found(struct nfc_digital_dev *ddev,
76 struct nfc_target *target, u8 protocol);
77
78 int digital_in_recv_mifare_res(struct sk_buff *resp);
79
80 int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
81 struct nfc_target *target, __u8 comm_mode, __u8 *gb,
82 size_t gb_len);
83 int digital_in_send_dep_req(struct nfc_digital_dev *ddev,
84 struct nfc_target *target, struct sk_buff *skb,
85 struct digital_data_exch *data_exch);
86
87 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
88 static inline int digital_tg_send_cmd(struct nfc_digital_dev *ddev,
89 struct sk_buff *skb, u16 timeout,
90 nfc_digital_cmd_complete_t cmd_cb, void *cb_context)
91 {
92 return digital_send_cmd(ddev, DIGITAL_CMD_TG_SEND, skb, NULL, timeout,
93 cmd_cb, cb_context);
94 }
95
96 void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg,
97 struct sk_buff *resp);
98
99 void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg,
100 struct sk_buff *resp);
101
102 static inline int digital_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
103 nfc_digital_cmd_complete_t cb, void *arg)
104 {
105 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN, NULL, NULL,
106 timeout, cb, arg);
107 }
108
109 void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
110 struct sk_buff *resp);
111
112 int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb);
113
114 int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech);
115 int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech);
116 void digital_tg_recv_md_req(struct nfc_digital_dev *ddev, void *arg,
117 struct sk_buff *resp);
118
119 typedef u16 (*crc_func_t)(u16, const u8 *, size_t);
120
121 #define CRC_A_INIT 0x6363
122 #define CRC_B_INIT 0xFFFF
123 #define CRC_F_INIT 0x0000
124
125 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
126 u8 bitwise_inv, u8 msb_first);
127
128 static inline void digital_skb_add_crc_a(struct sk_buff *skb)
129 {
130 digital_skb_add_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
131 }
132
133 static inline void digital_skb_add_crc_b(struct sk_buff *skb)
134 {
135 digital_skb_add_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
136 }
137
138 static inline void digital_skb_add_crc_f(struct sk_buff *skb)
139 {
140 digital_skb_add_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
141 }
142
143 static inline void digital_skb_add_crc_none(struct sk_buff *skb)
144 {
145 return;
146 }
147
148 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
149 u16 crc_init, u8 bitwise_inv, u8 msb_first);
150
151 static inline int digital_skb_check_crc_a(struct sk_buff *skb)
152 {
153 return digital_skb_check_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
154 }
155
156 static inline int digital_skb_check_crc_b(struct sk_buff *skb)
157 {
158 return digital_skb_check_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
159 }
160
161 static inline int digital_skb_check_crc_f(struct sk_buff *skb)
162 {
163 return digital_skb_check_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
164 }
165
166 static inline int digital_skb_check_crc_none(struct sk_buff *skb)
167 {
168 return 0;
169 }
170
171 #endif /* __DIGITAL_H */
172
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