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
 48struct digital_data_exch {
 49	data_exchange_cb_t cb;
 50	void *cb_context;
 51};
 52
 53struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
 54				  unsigned int len);
 55
 56int 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
 61int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
 62static 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
 71void digital_poll_next_tech(struct nfc_digital_dev *ddev);
 72
 73int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech);
 74int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech);
 75int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech);
 76
 77int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev,
 78				struct sk_buff *skb);
 79int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev,
 80				struct sk_buff *skb);
 81
 82int digital_target_found(struct nfc_digital_dev *ddev,
 83			 struct nfc_target *target, u8 protocol);
 84
 85int digital_in_recv_mifare_res(struct sk_buff *resp);
 86
 87int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
 88			    struct nfc_target *target, __u8 comm_mode, __u8 *gb,
 89			    size_t gb_len);
 90int 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);
 93
 94int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
 95static 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)
 98{
 99	return digital_send_cmd(ddev, DIGITAL_CMD_TG_SEND, skb, NULL, timeout,
100				cmd_cb, cb_context);
101}
102
103void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg,
104			      struct sk_buff *resp);
105
106void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg,
107			       struct sk_buff *resp);
108
109static inline int digital_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
110				    nfc_digital_cmd_complete_t cb, void *arg)
111{
112	return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN, NULL, NULL,
113				timeout, cb, arg);
114}
115
116void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
117			     struct sk_buff *resp);
118
119int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb);
120
121int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech);
122int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech);
123
124typedef u16 (*crc_func_t)(u16, const u8 *, size_t);
125
126#define CRC_A_INIT 0x6363
127#define CRC_B_INIT 0xFFFF
128#define CRC_F_INIT 0x0000
129
130void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
131			 u8 bitwise_inv, u8 msb_first);
132
133static inline void digital_skb_add_crc_a(struct sk_buff *skb)
134{
135	digital_skb_add_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
136}
137
138static inline void digital_skb_add_crc_b(struct sk_buff *skb)
139{
140	digital_skb_add_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
141}
142
143static inline void digital_skb_add_crc_f(struct sk_buff *skb)
144{
145	digital_skb_add_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
146}
147
148static inline void digital_skb_add_crc_none(struct sk_buff *skb)
149{
150	return;
151}
152
153int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
154			  u16 crc_init, u8 bitwise_inv, u8 msb_first);
155
156static inline int digital_skb_check_crc_a(struct sk_buff *skb)
157{
158	return digital_skb_check_crc(skb, crc_ccitt, CRC_A_INIT, 0, 0);
159}
160
161static inline int digital_skb_check_crc_b(struct sk_buff *skb)
162{
163	return digital_skb_check_crc(skb, crc_ccitt, CRC_B_INIT, 1, 0);
164}
165
166static inline int digital_skb_check_crc_f(struct sk_buff *skb)
167{
168	return digital_skb_check_crc(skb, crc_itu_t, CRC_F_INIT, 0, 1);
169}
170
171static inline int digital_skb_check_crc_none(struct sk_buff *skb)
172{
173	return 0;
174}
175
176#endif /* __DIGITAL_H */