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);
75 int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech);
77 int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev,
79 int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev,
82 int digital_target_found(struct nfc_digital_dev *ddev,
83 struct nfc_target *target, u8 protocol);
85 int digital_in_recv_mifare_res(struct sk_buff *resp);
87 int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
88 struct nfc_target *target, __u8 comm_mode, __u8 *gb,
90 int digital_in_send_dep_req(struct nfc_digital_dev *ddev,
91 struct nfc_target *target, struct sk_buff *skb,
92 struct digital_data_exch *data_exch);
94 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
95 static inline int digital_tg_send_cmd(struct nfc_digital_dev *ddev,
96 struct sk_buff *skb, u16 timeout,
97 nfc_digital_cmd_complete_t cmd_cb, void *cb_context)
99 return digital_send_cmd(ddev, DIGITAL_CMD_TG_SEND, skb, NULL, timeout,
103 void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg,
104 struct sk_buff *resp);
106 void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg,
107 struct sk_buff *resp);
109 static inline int digital_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
110 nfc_digital_cmd_complete_t cb, void *arg)
112 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN, NULL, NULL,
116 void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
117 struct sk_buff *resp);
119 int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb);
121 int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech);
122 int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech);
124 typedef u16 (*crc_func_t)(u16, const u8 *, size_t);
126 #define CRC_A_INIT 0x6363
127 #define CRC_B_INIT 0xFFFF
128 #define CRC_F_INIT 0x0000
130 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
131 u8 bitwise_inv, u8 msb_first);
133 static inline void digital_skb_add_crc_a(struct sk_buff *skb)
135 digital_skb_add_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
138 static inline void digital_skb_add_crc_b(struct sk_buff *skb)
140 digital_skb_add_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
143 static inline void digital_skb_add_crc_f(struct sk_buff *skb)
145 digital_skb_add_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
148 static inline void digital_skb_add_crc_none(struct sk_buff *skb)
153 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
154 u16 crc_init, u8 bitwise_inv, u8 msb_first);
156 static inline int digital_skb_check_crc_a(struct sk_buff *skb)
158 return digital_skb_check_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
161 static inline int digital_skb_check_crc_b(struct sk_buff *skb)
163 return digital_skb_check_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
166 static inline int digital_skb_check_crc_f(struct sk_buff *skb)
168 return digital_skb_check_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
171 static inline int digital_skb_check_crc_none(struct sk_buff *skb)
176 #endif /* __DIGITAL_H */