xref: /openbmc/linux/net/nfc/digital.h (revision 206a81c1)
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 
33 #define DIGITAL_MAX_HEADER_LEN 7
34 #define DIGITAL_CRC_LEN        2
35 
36 #define DIGITAL_SENSF_NFCID2_NFC_DEP_B1 0x01
37 #define DIGITAL_SENSF_NFCID2_NFC_DEP_B2 0xFE
38 
39 #define DIGITAL_SENS_RES_NFC_DEP 0x0100
40 #define DIGITAL_SEL_RES_NFC_DEP  0x40
41 #define DIGITAL_SENSF_FELICA_SC  0xFFFF
42 
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)
47 
48 struct digital_data_exch {
49 	data_exchange_cb_t cb;
50 	void *cb_context;
51 };
52 
53 struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
54 				  unsigned int len);
55 
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,
59 		     void *cb_context);
60 
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,
65 				      void *cb_context)
66 {
67 	return digital_send_cmd(ddev, DIGITAL_CMD_IN_SEND, skb, NULL, timeout,
68 				cmd_cb, cb_context);
69 }
70 
71 void digital_poll_next_tech(struct nfc_digital_dev *ddev);
72 
73 int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech);
74 int digital_in_send_sensb_req(struct nfc_digital_dev *ddev, u8 rf_tech);
75 int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech);
76 int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech);
77 
78 int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev,
79 				struct sk_buff *skb);
80 int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev,
81 				struct sk_buff *skb);
82 
83 int digital_target_found(struct nfc_digital_dev *ddev,
84 			 struct nfc_target *target, u8 protocol);
85 
86 int digital_in_recv_mifare_res(struct sk_buff *resp);
87 
88 int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
89 			    struct nfc_target *target, __u8 comm_mode, __u8 *gb,
90 			    size_t gb_len);
91 int digital_in_send_dep_req(struct nfc_digital_dev *ddev,
92 			    struct nfc_target *target, struct sk_buff *skb,
93 			    struct digital_data_exch *data_exch);
94 
95 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
96 static inline int digital_tg_send_cmd(struct nfc_digital_dev *ddev,
97 			struct sk_buff *skb, u16 timeout,
98 			nfc_digital_cmd_complete_t cmd_cb, void *cb_context)
99 {
100 	return digital_send_cmd(ddev, DIGITAL_CMD_TG_SEND, skb, NULL, timeout,
101 				cmd_cb, cb_context);
102 }
103 
104 void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg,
105 			      struct sk_buff *resp);
106 
107 void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg,
108 			       struct sk_buff *resp);
109 
110 static inline int digital_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
111 				    nfc_digital_cmd_complete_t cb, void *arg)
112 {
113 	return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN, NULL, NULL,
114 				timeout, cb, arg);
115 }
116 
117 void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
118 			     struct sk_buff *resp);
119 
120 int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb);
121 
122 int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech);
123 int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech);
124 
125 typedef u16 (*crc_func_t)(u16, const u8 *, size_t);
126 
127 #define CRC_A_INIT 0x6363
128 #define CRC_B_INIT 0xFFFF
129 #define CRC_F_INIT 0x0000
130 
131 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
132 			 u8 bitwise_inv, u8 msb_first);
133 
134 static inline void digital_skb_add_crc_a(struct sk_buff *skb)
135 {
136 	digital_skb_add_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
137 }
138 
139 static inline void digital_skb_add_crc_b(struct sk_buff *skb)
140 {
141 	digital_skb_add_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
142 }
143 
144 static inline void digital_skb_add_crc_f(struct sk_buff *skb)
145 {
146 	digital_skb_add_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
147 }
148 
149 static inline void digital_skb_add_crc_none(struct sk_buff *skb)
150 {
151 	return;
152 }
153 
154 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
155 			  u16 crc_init, u8 bitwise_inv, u8 msb_first);
156 
157 static inline int digital_skb_check_crc_a(struct sk_buff *skb)
158 {
159 	return digital_skb_check_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
160 }
161 
162 static inline int digital_skb_check_crc_b(struct sk_buff *skb)
163 {
164 	return digital_skb_check_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
165 }
166 
167 static inline int digital_skb_check_crc_f(struct sk_buff *skb)
168 {
169 	return digital_skb_check_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
170 }
171 
172 static inline int digital_skb_check_crc_none(struct sk_buff *skb)
173 {
174 	return 0;
175 }
176 
177 #endif /* __DIGITAL_H */
178