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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
40struct digital_data_exch {
41 data_exchange_cb_t cb;
42 void *cb_context;
43};
44
45struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
46 unsigned int len);
47
48int 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
53int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
54static 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
63void digital_poll_next_tech(struct nfc_digital_dev *ddev);
64
65int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech);
66int digital_in_send_sensb_req(struct nfc_digital_dev *ddev, u8 rf_tech);
67int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech);
68int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech);
69
70int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev,
71 struct sk_buff *skb);
72int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev,
73 struct sk_buff *skb);
74
75int digital_target_found(struct nfc_digital_dev *ddev,
76 struct nfc_target *target, u8 protocol);
77
78int digital_in_recv_mifare_res(struct sk_buff *resp);
79
80int 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);
83int 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
87int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
88static 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
96void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg,
97 struct sk_buff *resp);
98
99void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg,
100 struct sk_buff *resp);
101
102static 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
109void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
110 struct sk_buff *resp);
111
112int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb);
113
114int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech);
115int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech);
116void digital_tg_recv_md_req(struct nfc_digital_dev *ddev, void *arg,
117 struct sk_buff *resp);
118
119typedef 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
125void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
126 u8 bitwise_inv, u8 msb_first);
127
128static 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
133static 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
138static 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
143static inline void digital_skb_add_crc_none(struct sk_buff *skb)
144{
145 return;
146}
147
148int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
149 u16 crc_init, u8 bitwise_inv, u8 msb_first);
150
151static 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
156static 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
161static 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
166static inline int digital_skb_check_crc_none(struct sk_buff *skb)
167{
168 return 0;
169}
170
171#endif /* __DIGITAL_H */