include/net/nfc/nfc.h

   1 /*
   2  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   3  *
   4  * Authors:
   5  *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
   6  *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the
  20  * Free Software Foundation, Inc.,
  21  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23
  24 #ifndef __NET_NFC_H
  25 #define __NET_NFC_H
  26
  27 #include <linux/nfc.h>
  28 #include <linux/device.h>
  29 #include <linux/skbuff.h>
  30
  31 #define nfc_dev_info(dev, fmt, arg...) dev_info((dev), "NFC: " fmt "\n", ## arg)
  32 #define nfc_dev_err(dev, fmt, arg...) dev_err((dev), "NFC: " fmt "\n", ## arg)
  33 #define nfc_dev_dbg(dev, fmt, arg...) dev_dbg((dev), fmt "\n", ## arg)
  34
  35 struct nfc_dev;
  36
  37 /**
  38  * data_exchange_cb_t - Definition of nfc_data_exchange callback
  39  *
  40  * @context: nfc_data_exchange cb_context parameter
  41  * @skb: response data
  42  * @err: If an error has occurred during data exchange, it is the
  43  *      error number. Zero means no error.
  44  *
  45  * When a rx or tx package is lost or corrupted or the target gets out
  46  * of the operating field, err is -EIO.
  47  */
  48 typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb,
  49                                                                 int err);
  50
  51 struct nfc_target;
  52
  53 struct nfc_ops {
  54         int (*dev_up)(struct nfc_dev *dev);
  55         int (*dev_down)(struct nfc_dev *dev);
  56         int (*start_poll)(struct nfc_dev *dev,
  57                           u32 im_protocols, u32 tm_protocols);
  58         void (*stop_poll)(struct nfc_dev *dev);
  59         int (*dep_link_up)(struct nfc_dev *dev, struct nfc_target *target,
  60                            u8 comm_mode, u8 *gb, size_t gb_len);
  61         int (*dep_link_down)(struct nfc_dev *dev);
  62         int (*activate_target)(struct nfc_dev *dev, struct nfc_target *target,
  63                                u32 protocol);
  64         void (*deactivate_target)(struct nfc_dev *dev,
  65                                   struct nfc_target *target);
  66         int (*im_transceive)(struct nfc_dev *dev, struct nfc_target *target,
  67                              struct sk_buff *skb, data_exchange_cb_t cb,
  68                              void *cb_context);
  69         int (*tm_send)(struct nfc_dev *dev, struct sk_buff *skb);
  70         int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target);
  71 };
  72
  73 #define NFC_TARGET_IDX_ANY -1
  74 #define NFC_MAX_GT_LEN 48
  75 #define NFC_ATR_RES_GT_OFFSET 15
  76
  77 struct nfc_target {
  78         u32 idx;
  79         u32 supported_protocols;
  80         u16 sens_res;
  81         u8 sel_res;
  82         u8 nfcid1_len;
  83         u8 nfcid1[NFC_NFCID1_MAXSIZE];
  84         u8 sensb_res_len;
  85         u8 sensb_res[NFC_SENSB_RES_MAXSIZE];
  86         u8 sensf_res_len;
  87         u8 sensf_res[NFC_SENSF_RES_MAXSIZE];
  88         u8 hci_reader_gate;
  89         u8 logical_idx;
  90 };
  91
  92 struct nfc_genl_data {
  93         u32 poll_req_portid;
  94         struct mutex genl_data_mutex;
  95 };
  96
  97 struct nfc_dev {
  98         unsigned int idx;
  99         u32 target_next_idx;
 100         struct nfc_target *targets;
 101         int n_targets;
 102         int targets_generation;
 103         struct device dev;
 104         bool dev_up;
 105         u8 rf_mode;
 106         bool polling;
 107         struct nfc_target *active_target;
 108         bool dep_link_up;
 109         struct nfc_genl_data genl_data;
 110         u32 supported_protocols;
 111
 112         int tx_headroom;
 113         int tx_tailroom;
 114
 115         struct timer_list check_pres_timer;
 116         struct work_struct check_pres_work;
 117
 118         struct nfc_ops *ops;
 119 };
 120 #define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
 121
 122 extern struct class nfc_class;
 123
 124 struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
 125                                     u32 supported_protocols,
 126                                     int tx_headroom,
 127                                     int tx_tailroom);
 128
 129 /**
 130  * nfc_free_device - free nfc device
 131  *
 132  * @dev: The nfc device to free
 133  */
 134 static inline void nfc_free_device(struct nfc_dev *dev)
 135 {
 136         put_device(&dev->dev);
 137 }
 138
 139 int nfc_register_device(struct nfc_dev *dev);
 140
 141 void nfc_unregister_device(struct nfc_dev *dev);
 142
 143 /**
 144  * nfc_set_parent_dev - set the parent device
 145  *
 146  * @nfc_dev: The nfc device whose parent is being set
 147  * @dev: The parent device
 148  */
 149 static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
 150                                       struct device *dev)
 151 {
 152         nfc_dev->dev.parent = dev;
 153 }
 154
 155 /**
 156  * nfc_set_drvdata - set driver specifc data
 157  *
 158  * @dev: The nfc device
 159  * @data: Pointer to driver specifc data
 160  */
 161 static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
 162 {
 163         dev_set_drvdata(&dev->dev, data);
 164 }
 165
 166 /**
 167  * nfc_get_drvdata - get driver specifc data
 168  *
 169  * @dev: The nfc device
 170  */
 171 static inline void *nfc_get_drvdata(struct nfc_dev *dev)
 172 {
 173         return dev_get_drvdata(&dev->dev);
 174 }
 175
 176 /**
 177  * nfc_device_name - get the nfc device name
 178  *
 179  * @dev: The nfc device whose name to return
 180  */
 181 static inline const char *nfc_device_name(struct nfc_dev *dev)
 182 {
 183         return dev_name(&dev->dev);
 184 }
 185
 186 struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
 187                                    unsigned int flags, unsigned int size,
 188                                    unsigned int *err);
 189 struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
 190
 191 int nfc_set_remote_general_bytes(struct nfc_dev *dev,
 192                                  u8 *gt, u8 gt_len);
 193 u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len);
 194
 195 int nfc_targets_found(struct nfc_dev *dev,
 196                       struct nfc_target *targets, int ntargets);
 197 int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);
 198
 199 int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
 200                        u8 comm_mode, u8 rf_mode);
 201
 202 int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
 203                      u8 *gb, size_t gb_len);
 204 int nfc_tm_deactivated(struct nfc_dev *dev);
 205 int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb);
 206
 207 void nfc_driver_failure(struct nfc_dev *dev, int err);
 208
 209 #endif /* __NET_NFC_H */