include/net/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 (*start_poll)(struct nfc_dev *dev, u32 protocols);
  52         void (*stop_poll)(struct nfc_dev *dev);
  53         int (*activate_target)(struct nfc_dev *dev, u32 target_idx,
  54                                                         u32 protocol);
  55         void (*deactivate_target)(struct nfc_dev *dev, u32 target_idx);
  56         int (*data_exchange)(struct nfc_dev *dev, u32 target_idx,
  57                                 struct sk_buff *skb, data_exchange_cb_t cb,
  58                                                         void *cb_context);
  59 };
  60
  61 struct nfc_target {
  62         u32 idx;
  63         u32 supported_protocols;
  64         u16 sens_res;
  65         u8 sel_res;
  66 };
  67
  68 struct nfc_genl_data {
  69         u32 poll_req_pid;
  70         struct mutex genl_data_mutex;
  71 };
  72
  73 struct nfc_dev {
  74         unsigned idx;
  75         unsigned target_idx;
  76         struct nfc_target *targets;
  77         int n_targets;
  78         int targets_generation;
  79         spinlock_t targets_lock;
  80         struct device dev;
  81         bool polling;
  82         struct nfc_genl_data genl_data;
  83         u32 supported_protocols;
  84
  85         int tx_headroom;
  86         int tx_tailroom;
  87
  88         struct nfc_ops *ops;
  89 };
  90 #define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
  91
  92 extern struct class nfc_class;
  93
  94 struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
  95                                         u32 supported_protocols,
  96                                         int tx_headroom,
  97                                         int tx_tailroom);
  98
  99 /**
 100  * nfc_free_device - free nfc device
 101  *
 102  * @dev: The nfc device to free
 103  */
 104 static inline void nfc_free_device(struct nfc_dev *dev)
 105 {
 106         put_device(&dev->dev);
 107 }
 108
 109 int nfc_register_device(struct nfc_dev *dev);
 110
 111 void nfc_unregister_device(struct nfc_dev *dev);
 112
 113 /**
 114  * nfc_set_parent_dev - set the parent device
 115  *
 116  * @nfc_dev: The nfc device whose parent is being set
 117  * @dev: The parent device
 118  */
 119 static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
 120                                         struct device *dev)
 121 {
 122         nfc_dev->dev.parent = dev;
 123 }
 124
 125 /**
 126  * nfc_set_drvdata - set driver specifc data
 127  *
 128  * @dev: The nfc device
 129  * @data: Pointer to driver specifc data
 130  */
 131 static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
 132 {
 133         dev_set_drvdata(&dev->dev, data);
 134 }
 135
 136 /**
 137  * nfc_get_drvdata - get driver specifc data
 138  *
 139  * @dev: The nfc device
 140  */
 141 static inline void *nfc_get_drvdata(struct nfc_dev *dev)
 142 {
 143         return dev_get_drvdata(&dev->dev);
 144 }
 145
 146 /**
 147  * nfc_device_name - get the nfc device name
 148  *
 149  * @dev: The nfc device whose name to return
 150  */
 151 static inline const char *nfc_device_name(struct nfc_dev *dev)
 152 {
 153         return dev_name(&dev->dev);
 154 }
 155
 156 struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp);
 157
 158 int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets,
 159                                                         int ntargets);
 160
 161 #endif /* __NET_NFC_H */