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_info(dev, fmt, ...) dev_info((dev), "NFC: " fmt, ##__VA_ARGS__)
  32 #define nfc_err(dev, fmt, ...) dev_err((dev), "NFC: " fmt, ##__VA_ARGS__)
  33
  34 struct nfc_phy_ops {
  35         int (*write)(void *dev_id, struct sk_buff *skb);
  36         int (*enable)(void *dev_id);
  37         void (*disable)(void *dev_id);
  38 };
  39
  40 struct nfc_dev;
  41
  42 /**
  43  * data_exchange_cb_t - Definition of nfc_data_exchange callback
  44  *
  45  * @context: nfc_data_exchange cb_context parameter
  46  * @skb: response data
  47  * @err: If an error has occurred during data exchange, it is the
  48  *      error number. Zero means no error.
  49  *
  50  * When a rx or tx package is lost or corrupted or the target gets out
  51  * of the operating field, err is -EIO.
  52  */
  53 typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb,
  54                                                                 int err);
  55
  56 typedef void (*se_io_cb_t)(void *context, u8 *apdu, size_t apdu_len, int err);
  57
  58 struct nfc_target;
  59
  60 struct nfc_ops {
  61         int (*dev_up)(struct nfc_dev *dev);
  62         int (*dev_down)(struct nfc_dev *dev);
  63         int (*start_poll)(struct nfc_dev *dev,
  64                           u32 im_protocols, u32 tm_protocols);
  65         void (*stop_poll)(struct nfc_dev *dev);
  66         int (*dep_link_up)(struct nfc_dev *dev, struct nfc_target *target,
  67                            u8 comm_mode, u8 *gb, size_t gb_len);
  68         int (*dep_link_down)(struct nfc_dev *dev);
  69         int (*activate_target)(struct nfc_dev *dev, struct nfc_target *target,
  70                                u32 protocol);
  71         void (*deactivate_target)(struct nfc_dev *dev,
  72                                   struct nfc_target *target);
  73         int (*im_transceive)(struct nfc_dev *dev, struct nfc_target *target,
  74                              struct sk_buff *skb, data_exchange_cb_t cb,
  75                              void *cb_context);
  76         int (*tm_send)(struct nfc_dev *dev, struct sk_buff *skb);
  77         int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target);
  78         int (*fw_download)(struct nfc_dev *dev, const char *firmware_name);
  79
  80         /* Secure Element API */
  81         int (*discover_se)(struct nfc_dev *dev);
  82         int (*enable_se)(struct nfc_dev *dev, u32 se_idx);
  83         int (*disable_se)(struct nfc_dev *dev, u32 se_idx);
  84         int (*se_io) (struct nfc_dev *dev, u32 se_idx,
  85                       u8 *apdu, size_t apdu_length,
  86                       se_io_cb_t cb, void *cb_context);
  87 };
  88
  89 #define NFC_TARGET_IDX_ANY -1
  90 #define NFC_MAX_GT_LEN 48
  91 #define NFC_ATR_RES_GT_OFFSET 15
  92
  93 /**
  94  * struct nfc_target - NFC target descriptiom
  95  *
  96  * @sens_res: 2 bytes describing the target SENS_RES response, if the target
  97  *      is a type A one. The %sens_res most significant byte must be byte 2
  98  *      as described by the NFC Forum digital specification (i.e. the platform
  99  *      configuration one) while %sens_res least significant byte is byte 1.
 100  */
 101 struct nfc_target {
 102         u32 idx;
 103         u32 supported_protocols;
 104         u16 sens_res;
 105         u8 sel_res;
 106         u8 nfcid1_len;
 107         u8 nfcid1[NFC_NFCID1_MAXSIZE];
 108         u8 nfcid2_len;
 109         u8 nfcid2[NFC_NFCID2_MAXSIZE];
 110         u8 sensb_res_len;
 111         u8 sensb_res[NFC_SENSB_RES_MAXSIZE];
 112         u8 sensf_res_len;
 113         u8 sensf_res[NFC_SENSF_RES_MAXSIZE];
 114         u8 hci_reader_gate;
 115         u8 logical_idx;
 116 };
 117
 118 /**
 119  * nfc_se - A structure for NFC accessible secure elements.
 120  *
 121  * @idx: The secure element index. User space will enable or
 122  *       disable a secure element by its index.
 123  * @type: The secure element type. It can be SE_UICC or
 124  *        SE_EMBEDDED.
 125  * @state: The secure element state, either enabled or disabled.
 126  *
 127  */
 128 struct nfc_se {
 129         struct list_head list;
 130         u32 idx;
 131         u16 type;
 132         u16 state;
 133 };
 134
 135 struct nfc_genl_data {
 136         u32 poll_req_portid;
 137         struct mutex genl_data_mutex;
 138 };
 139
 140 struct nfc_dev {
 141         int idx;
 142         u32 target_next_idx;
 143         struct nfc_target *targets;
 144         int n_targets;
 145         int targets_generation;
 146         struct device dev;
 147         bool dev_up;
 148         bool fw_download_in_progress;
 149         u8 rf_mode;
 150         bool polling;
 151         struct nfc_target *active_target;
 152         bool dep_link_up;
 153         struct nfc_genl_data genl_data;
 154         u32 supported_protocols;
 155
 156         struct list_head secure_elements;
 157
 158         int tx_headroom;
 159         int tx_tailroom;
 160
 161         struct timer_list check_pres_timer;
 162         struct work_struct check_pres_work;
 163
 164         bool shutting_down;
 165
 166         struct rfkill *rfkill;
 167
 168         struct nfc_ops *ops;
 169 };
 170 #define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
 171
 172 extern struct class nfc_class;
 173
 174 struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
 175                                     u32 supported_protocols,
 176                                     int tx_headroom,
 177                                     int tx_tailroom);
 178
 179 /**
 180  * nfc_free_device - free nfc device
 181  *
 182  * @dev: The nfc device to free
 183  */
 184 static inline void nfc_free_device(struct nfc_dev *dev)
 185 {
 186         put_device(&dev->dev);
 187 }
 188
 189 int nfc_register_device(struct nfc_dev *dev);
 190
 191 void nfc_unregister_device(struct nfc_dev *dev);
 192
 193 /**
 194  * nfc_set_parent_dev - set the parent device
 195  *
 196  * @nfc_dev: The nfc device whose parent is being set
 197  * @dev: The parent device
 198  */
 199 static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
 200                                       struct device *dev)
 201 {
 202         nfc_dev->dev.parent = dev;
 203 }
 204
 205 /**
 206  * nfc_set_drvdata - set driver specifc data
 207  *
 208  * @dev: The nfc device
 209  * @data: Pointer to driver specifc data
 210  */
 211 static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
 212 {
 213         dev_set_drvdata(&dev->dev, data);
 214 }
 215
 216 /**
 217  * nfc_get_drvdata - get driver specifc data
 218  *
 219  * @dev: The nfc device
 220  */
 221 static inline void *nfc_get_drvdata(struct nfc_dev *dev)
 222 {
 223         return dev_get_drvdata(&dev->dev);
 224 }
 225
 226 /**
 227  * nfc_device_name - get the nfc device name
 228  *
 229  * @dev: The nfc device whose name to return
 230  */
 231 static inline const char *nfc_device_name(struct nfc_dev *dev)
 232 {
 233         return dev_name(&dev->dev);
 234 }
 235
 236 struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
 237                                    unsigned int flags, unsigned int size,
 238                                    unsigned int *err);
 239 struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
 240
 241 int nfc_set_remote_general_bytes(struct nfc_dev *dev,
 242                                  u8 *gt, u8 gt_len);
 243 u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len);
 244
 245 int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
 246                          u32 result);
 247
 248 int nfc_targets_found(struct nfc_dev *dev,
 249                       struct nfc_target *targets, int ntargets);
 250 int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);
 251
 252 int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
 253                        u8 comm_mode, u8 rf_mode);
 254
 255 int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
 256                      u8 *gb, size_t gb_len);
 257 int nfc_tm_deactivated(struct nfc_dev *dev);
 258 int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb);
 259
 260 void nfc_driver_failure(struct nfc_dev *dev, int err);
 261
 262 int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type);
 263 int nfc_remove_se(struct nfc_dev *dev, u32 se_idx);
 264 struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx);
 265
 266 #endif /* __NET_NFC_H */