include/net/nfc/nfc.h

   1 /*
   2  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   3  * Copyright (C) 2014 Marvell International Ltd.
   4  *
   5  * Authors:
   6  *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
   7  *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #ifndef __NET_NFC_H
  24 #define __NET_NFC_H
  25
  26 #include <linux/nfc.h>
  27 #include <linux/device.h>
  28 #include <linux/skbuff.h>
  29
  30 #define nfc_info(dev, fmt, ...) dev_info((dev), "NFC: " fmt, ##__VA_ARGS__)
  31 #define nfc_err(dev, fmt, ...) dev_err((dev), "NFC: " fmt, ##__VA_ARGS__)
  32
  33 struct nfc_phy_ops {
  34         int (*write)(void *dev_id, struct sk_buff *skb);
  35         int (*enable)(void *dev_id);
  36         void (*disable)(void *dev_id);
  37 };
  38
  39 struct nfc_dev;
  40
  41 /**
  42  * data_exchange_cb_t - Definition of nfc_data_exchange callback
  43  *
  44  * @context: nfc_data_exchange cb_context parameter
  45  * @skb: response data
  46  * @err: If an error has occurred during data exchange, it is the
  47  *      error number. Zero means no error.
  48  *
  49  * When a rx or tx package is lost or corrupted or the target gets out
  50  * of the operating field, err is -EIO.
  51  */
  52 typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb,
  53                                                                 int err);
  54
  55 typedef void (*se_io_cb_t)(void *context, u8 *apdu, size_t apdu_len, int err);
  56
  57 struct nfc_target;
  58
  59 struct nfc_ops {
  60         int (*dev_up)(struct nfc_dev *dev);
  61         int (*dev_down)(struct nfc_dev *dev);
  62         int (*start_poll)(struct nfc_dev *dev,
  63                           u32 im_protocols, u32 tm_protocols);
  64         void (*stop_poll)(struct nfc_dev *dev);
  65         int (*dep_link_up)(struct nfc_dev *dev, struct nfc_target *target,
  66                            u8 comm_mode, u8 *gb, size_t gb_len);
  67         int (*dep_link_down)(struct nfc_dev *dev);
  68         int (*activate_target)(struct nfc_dev *dev, struct nfc_target *target,
  69                                u32 protocol);
  70         void (*deactivate_target)(struct nfc_dev *dev,
  71                                   struct nfc_target *target);
  72         int (*im_transceive)(struct nfc_dev *dev, struct nfc_target *target,
  73                              struct sk_buff *skb, data_exchange_cb_t cb,
  74                              void *cb_context);
  75         int (*tm_send)(struct nfc_dev *dev, struct sk_buff *skb);
  76         int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target);
  77         int (*fw_download)(struct nfc_dev *dev, const char *firmware_name);
  78
  79         /* Secure Element API */
  80         int (*discover_se)(struct nfc_dev *dev);
  81         int (*enable_se)(struct nfc_dev *dev, u32 se_idx);
  82         int (*disable_se)(struct nfc_dev *dev, u32 se_idx);
  83         int (*se_io) (struct nfc_dev *dev, u32 se_idx,
  84                       u8 *apdu, size_t apdu_length,
  85                       se_io_cb_t cb, void *cb_context);
  86 };
  87
  88 #define NFC_TARGET_IDX_ANY -1
  89 #define NFC_MAX_GT_LEN 48
  90 #define NFC_ATR_RES_GT_OFFSET 15
  91 #define NFC_ATR_REQ_GT_OFFSET 14
  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         u8 is_iso15693;
 117         u8 iso15693_dsfid;
 118         u8 iso15693_uid[NFC_ISO15693_UID_MAXSIZE];
 119 };
 120
 121 /**
 122  * nfc_se - A structure for NFC accessible secure elements.
 123  *
 124  * @idx: The secure element index. User space will enable or
 125  *       disable a secure element by its index.
 126  * @type: The secure element type. It can be SE_UICC or
 127  *        SE_EMBEDDED.
 128  * @state: The secure element state, either enabled or disabled.
 129  *
 130  */
 131 struct nfc_se {
 132         struct list_head list;
 133         u32 idx;
 134         u16 type;
 135         u16 state;
 136 };
 137
 138 struct nfc_genl_data {
 139         u32 poll_req_portid;
 140         struct mutex genl_data_mutex;
 141 };
 142
 143 struct nfc_dev {
 144         int idx;
 145         u32 target_next_idx;
 146         struct nfc_target *targets;
 147         int n_targets;
 148         int targets_generation;
 149         struct device dev;
 150         bool dev_up;
 151         bool fw_download_in_progress;
 152         u8 rf_mode;
 153         bool polling;
 154         struct nfc_target *active_target;
 155         bool dep_link_up;
 156         struct nfc_genl_data genl_data;
 157         u32 supported_protocols;
 158
 159         struct list_head secure_elements;
 160
 161         int tx_headroom;
 162         int tx_tailroom;
 163
 164         struct timer_list check_pres_timer;
 165         struct work_struct check_pres_work;
 166
 167         bool shutting_down;
 168
 169         struct rfkill *rfkill;
 170
 171         struct nfc_ops *ops;
 172 };
 173 #define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
 174
 175 extern struct class nfc_class;
 176
 177 struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
 178                                     u32 supported_protocols,
 179                                     int tx_headroom,
 180                                     int tx_tailroom);
 181
 182 /**
 183  * nfc_free_device - free nfc device
 184  *
 185  * @dev: The nfc device to free
 186  */
 187 static inline void nfc_free_device(struct nfc_dev *dev)
 188 {
 189         put_device(&dev->dev);
 190 }
 191
 192 int nfc_register_device(struct nfc_dev *dev);
 193
 194 void nfc_unregister_device(struct nfc_dev *dev);
 195
 196 /**
 197  * nfc_set_parent_dev - set the parent device
 198  *
 199  * @nfc_dev: The nfc device whose parent is being set
 200  * @dev: The parent device
 201  */
 202 static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
 203                                       struct device *dev)
 204 {
 205         nfc_dev->dev.parent = dev;
 206 }
 207
 208 /**
 209  * nfc_set_drvdata - set driver specifc data
 210  *
 211  * @dev: The nfc device
 212  * @data: Pointer to driver specifc data
 213  */
 214 static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
 215 {
 216         dev_set_drvdata(&dev->dev, data);
 217 }
 218
 219 /**
 220  * nfc_get_drvdata - get driver specifc data
 221  *
 222  * @dev: The nfc device
 223  */
 224 static inline void *nfc_get_drvdata(struct nfc_dev *dev)
 225 {
 226         return dev_get_drvdata(&dev->dev);
 227 }
 228
 229 /**
 230  * nfc_device_name - get the nfc device name
 231  *
 232  * @dev: The nfc device whose name to return
 233  */
 234 static inline const char *nfc_device_name(struct nfc_dev *dev)
 235 {
 236         return dev_name(&dev->dev);
 237 }
 238
 239 struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
 240                                    unsigned int flags, unsigned int size,
 241                                    unsigned int *err);
 242 struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
 243
 244 int nfc_set_remote_general_bytes(struct nfc_dev *dev,
 245                                  u8 *gt, u8 gt_len);
 246 u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len);
 247
 248 int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
 249                          u32 result);
 250
 251 int nfc_targets_found(struct nfc_dev *dev,
 252                       struct nfc_target *targets, int ntargets);
 253 int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);
 254
 255 int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
 256                        u8 comm_mode, u8 rf_mode);
 257
 258 int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
 259                      u8 *gb, size_t gb_len);
 260 int nfc_tm_deactivated(struct nfc_dev *dev);
 261 int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb);
 262
 263 void nfc_driver_failure(struct nfc_dev *dev, int err);
 264
 265 int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type);
 266 int nfc_remove_se(struct nfc_dev *dev, u32 se_idx);
 267 struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx);
 268
 269 void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb,
 270                           u8 payload_type, u8 direction);
 271
 272 #endif /* __NET_NFC_H */