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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
49struct digital_data_exch {
50 data_exchange_cb_t cb;
51 void *cb_context;
52};
53
54struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
55 unsigned int len);
56
57int 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
62int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
63static 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
72void digital_poll_next_tech(struct nfc_digital_dev *ddev);
73
74int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech);
75int digital_in_send_sensb_req(struct nfc_digital_dev *ddev, u8 rf_tech);
76int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech);
77int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech);
78
79int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev,
80 struct sk_buff *skb);
81int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev,
82 struct sk_buff *skb);
83
84int digital_target_found(struct nfc_digital_dev *ddev,
85 struct nfc_target *target, u8 protocol);
86
87int digital_in_recv_mifare_res(struct sk_buff *resp);
88
89int 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);
92int 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
96int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
97static 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
105void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg,
106 struct sk_buff *resp);
107
108void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg,
109 struct sk_buff *resp);
110
111static 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
118void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
119 struct sk_buff *resp);
120
121int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb);
122
123int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech);
124int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech);
125void digital_tg_recv_md_req(struct nfc_digital_dev *ddev, void *arg,
126 struct sk_buff *resp);
127
128typedef 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
134void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
135 u8 bitwise_inv, u8 msb_first);
136
137static 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
142static 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
147static 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
152static inline void digital_skb_add_crc_none(struct sk_buff *skb)
153{
154 return;
155}
156
157int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
158 u16 crc_init, u8 bitwise_inv, u8 msb_first);
159
160static 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
165static 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
170static 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
175static inline int digital_skb_check_crc_none(struct sk_buff *skb)
176{
177 return 0;
178}
179
180#endif /* __DIGITAL_H */