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/device.h>
  28 #include <linux/skbuff.h>
  29
  30 #define nfc_dev_info(dev, fmt, arg...) dev_info((dev), "NFC: " fmt "\n", ## arg)
  31 #define nfc_dev_err(dev, fmt, arg...) dev_err((dev), "NFC: " fmt "\n", ## arg)
  32 #define nfc_dev_dbg(dev, fmt, arg...) dev_dbg((dev), fmt "\n", ## arg)
  33
  34 struct nfc_dev;
  35
  36 /**
  37  * data_exchange_cb_t - Definition of nfc_data_exchange callback
  38  *
  39  * @context: nfc_data_exchange cb_context parameter
  40  * @skb: response data
  41  * @err: If an error has occurred during data exchange, it is the
  42  *      error number. Zero means no error.
  43  *
  44  * When a rx or tx package is lost or corrupted or the target gets out
  45  * of the operating field, err is -EIO.
  46  */
  47 typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb,
  48                                                                 int err);
  49
  50 struct nfc_ops {
  51         int (*dev_up)(struct nfc_dev *dev);
  52         int (*dev_down)(struct nfc_dev *dev);
  53         int (*start_poll)(struct nfc_dev *dev, u32 protocols);
  54         void (*stop_poll)(struct nfc_dev *dev);
  55         int (*dep_link_up)(struct nfc_dev *dev, int target_idx,
  56                                 u8 comm_mode, u8 rf_mode);
  57         int (*dep_link_down)(struct nfc_dev *dev);
  58         int (*activate_target)(struct nfc_dev *dev, u32 target_idx,
  59                                                         u32 protocol);
  60         void (*deactivate_target)(struct nfc_dev *dev, u32 target_idx);
  61         int (*data_exchange)(struct nfc_dev *dev, u32 target_idx,
  62                                 struct sk_buff *skb, data_exchange_cb_t cb,
  63                                                         void *cb_context);
  64 };
  65
  66 #define NFC_TARGET_IDX_ANY -1
  67 #define NFC_MAX_GT_LEN 48
  68 #define NFC_MAX_NFCID1_LEN 10
  69
  70 struct nfc_target {
  71         u32 idx;
  72         u32 supported_protocols;
  73         u16 sens_res;
  74         u8 sel_res;
  75         u8 nfcid1_len;
  76         u8 nfcid1[NFC_MAX_NFCID1_LEN];
  77 };
  78
  79 struct nfc_genl_data {
  80         u32 poll_req_pid;
  81         struct mutex genl_data_mutex;
  82 };
  83
  84 struct nfc_dev {
  85         unsigned idx;
  86         unsigned target_idx;
  87         struct nfc_target *targets;
  88         int n_targets;
  89         int targets_generation;
  90         spinlock_t targets_lock;
  91         struct device dev;
  92         bool dev_up;
  93         bool polling;
  94         bool remote_activated;
  95         bool dep_link_up;
  96         u32 dep_rf_mode;
  97         struct nfc_genl_data genl_data;
  98         u32 supported_protocols;
  99
 100         int tx_headroom;
 101         int tx_tailroom;
 102
 103         struct nfc_ops *ops;
 104 };
 105 #define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
 106
 107 extern struct class nfc_class;
 108
 109 struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
 110                                         u32 supported_protocols,
 111                                         int tx_headroom,
 112                                         int tx_tailroom);
 113
 114 /**
 115  * nfc_free_device - free nfc device
 116  *
 117  * @dev: The nfc device to free
 118  */
 119 static inline void nfc_free_device(struct nfc_dev *dev)
 120 {
 121         put_device(&dev->dev);
 122 }
 123
 124 int nfc_register_device(struct nfc_dev *dev);
 125
 126 void nfc_unregister_device(struct nfc_dev *dev);
 127
 128 /**
 129  * nfc_set_parent_dev - set the parent device
 130  *
 131  * @nfc_dev: The nfc device whose parent is being set
 132  * @dev: The parent device
 133  */
 134 static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
 135                                         struct device *dev)
 136 {
 137         nfc_dev->dev.parent = dev;
 138 }
 139
 140 /**
 141  * nfc_set_drvdata - set driver specifc data
 142  *
 143  * @dev: The nfc device
 144  * @data: Pointer to driver specifc data
 145  */
 146 static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
 147 {
 148         dev_set_drvdata(&dev->dev, data);
 149 }
 150
 151 /**
 152  * nfc_get_drvdata - get driver specifc data
 153  *
 154  * @dev: The nfc device
 155  */
 156 static inline void *nfc_get_drvdata(struct nfc_dev *dev)
 157 {
 158         return dev_get_drvdata(&dev->dev);
 159 }
 160
 161 /**
 162  * nfc_device_name - get the nfc device name
 163  *
 164  * @dev: The nfc device whose name to return
 165  */
 166 static inline const char *nfc_device_name(struct nfc_dev *dev)
 167 {
 168         return dev_name(&dev->dev);
 169 }
 170
 171 struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
 172                                         unsigned int flags, unsigned int size,
 173                                         unsigned int *err);
 174 struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
 175
 176 int nfc_set_remote_general_bytes(struct nfc_dev *dev,
 177                                         u8 *gt, u8 gt_len);
 178
 179 u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, u8 *gt_len);
 180
 181 int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets,
 182                                                         int ntargets);
 183
 184 int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
 185                        u8 comm_mode, u8 rf_mode);
 186
 187 #endif /* __NET_NFC_H */