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_ops {
  52         int (*dev_up)(struct nfc_dev *dev);
  53         int (*dev_down)(struct nfc_dev *dev);
  54         int (*start_poll)(struct nfc_dev *dev, u32 protocols);
  55         void (*stop_poll)(struct nfc_dev *dev);
  56         int (*dep_link_up)(struct nfc_dev *dev, int target_idx, u8 comm_mode,
  57                            u8 *gb, size_t gb_len);
  58         int (*dep_link_down)(struct nfc_dev *dev);
  59         int (*activate_target)(struct nfc_dev *dev, u32 target_idx,
  60                                u32 protocol);
  61         void (*deactivate_target)(struct nfc_dev *dev, u32 target_idx);
  62         int (*data_exchange)(struct nfc_dev *dev, u32 target_idx,
  63                              struct sk_buff *skb, data_exchange_cb_t cb,
  64                              void *cb_context);
  65 };
  66
  67 #define NFC_TARGET_IDX_ANY -1
  68 #define NFC_MAX_GT_LEN 48
  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_NFCID1_MAXSIZE];
  77         u8 sensb_res_len;
  78         u8 sensb_res[NFC_SENSB_RES_MAXSIZE];
  79         u8 sensf_res_len;
  80         u8 sensf_res[NFC_SENSF_RES_MAXSIZE];
  81 };
  82
  83 struct nfc_genl_data {
  84         u32 poll_req_pid;
  85         struct mutex genl_data_mutex;
  86 };
  87
  88 struct nfc_dev {
  89         unsigned idx;
  90         struct nfc_target *targets;
  91         int n_targets;
  92         int targets_generation;
  93         spinlock_t targets_lock;
  94         struct device dev;
  95         bool dev_up;
  96         bool polling;
  97         bool remote_activated;
  98         bool dep_link_up;
  99         u32 dep_rf_mode;
 100         struct nfc_genl_data genl_data;
 101         u32 supported_protocols;
 102
 103         int tx_headroom;
 104         int tx_tailroom;
 105
 106         struct nfc_ops *ops;
 107 };
 108 #define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
 109
 110 extern struct class nfc_class;
 111
 112 struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
 113                                     u32 supported_protocols,
 114                                     int tx_headroom,
 115                                     int tx_tailroom);
 116
 117 /**
 118  * nfc_free_device - free nfc device
 119  *
 120  * @dev: The nfc device to free
 121  */
 122 static inline void nfc_free_device(struct nfc_dev *dev)
 123 {
 124         put_device(&dev->dev);
 125 }
 126
 127 int nfc_register_device(struct nfc_dev *dev);
 128
 129 void nfc_unregister_device(struct nfc_dev *dev);
 130
 131 /**
 132  * nfc_set_parent_dev - set the parent device
 133  *
 134  * @nfc_dev: The nfc device whose parent is being set
 135  * @dev: The parent device
 136  */
 137 static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
 138                                       struct device *dev)
 139 {
 140         nfc_dev->dev.parent = dev;
 141 }
 142
 143 /**
 144  * nfc_set_drvdata - set driver specifc data
 145  *
 146  * @dev: The nfc device
 147  * @data: Pointer to driver specifc data
 148  */
 149 static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
 150 {
 151         dev_set_drvdata(&dev->dev, data);
 152 }
 153
 154 /**
 155  * nfc_get_drvdata - get driver specifc data
 156  *
 157  * @dev: The nfc device
 158  */
 159 static inline void *nfc_get_drvdata(struct nfc_dev *dev)
 160 {
 161         return dev_get_drvdata(&dev->dev);
 162 }
 163
 164 /**
 165  * nfc_device_name - get the nfc device name
 166  *
 167  * @dev: The nfc device whose name to return
 168  */
 169 static inline const char *nfc_device_name(struct nfc_dev *dev)
 170 {
 171         return dev_name(&dev->dev);
 172 }
 173
 174 struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
 175                                    unsigned int flags, unsigned int size,
 176                                    unsigned int *err);
 177 struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
 178
 179 int nfc_set_remote_general_bytes(struct nfc_dev *dev,
 180                                  u8 *gt, u8 gt_len);
 181
 182 int nfc_targets_found(struct nfc_dev *dev,
 183                       struct nfc_target *targets, int ntargets);
 184
 185 int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
 186                        u8 comm_mode, u8 rf_mode);
 187
 188 #endif /* __NET_NFC_H */