LXR linux/net/nfc/digital.h

   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 */
 181