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Linux/include/net/nfc/nfc.h

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  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, see <http://www.gnu.org/licenses/>.
 20  */
 21 
 22 #ifndef __NET_NFC_H
 23 #define __NET_NFC_H
 24 
 25 #include <linux/nfc.h>
 26 #include <linux/device.h>
 27 #include <linux/skbuff.h>
 28 
 29 #define nfc_info(dev, fmt, ...) dev_info((dev), "NFC: " fmt, ##__VA_ARGS__)
 30 #define nfc_err(dev, fmt, ...) dev_err((dev), "NFC: " fmt, ##__VA_ARGS__)
 31 
 32 struct nfc_phy_ops {
 33         int (*write)(void *dev_id, struct sk_buff *skb);
 34         int (*enable)(void *dev_id);
 35         void (*disable)(void *dev_id);
 36 };
 37 
 38 struct nfc_dev;
 39 
 40 /**
 41  * data_exchange_cb_t - Definition of nfc_data_exchange callback
 42  *
 43  * @context: nfc_data_exchange cb_context parameter
 44  * @skb: response data
 45  * @err: If an error has occurred during data exchange, it is the
 46  *      error number. Zero means no error.
 47  *
 48  * When a rx or tx package is lost or corrupted or the target gets out
 49  * of the operating field, err is -EIO.
 50  */
 51 typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb,
 52                                                                 int err);
 53 
 54 typedef void (*se_io_cb_t)(void *context, u8 *apdu, size_t apdu_len, int err);
 55 
 56 struct nfc_target;
 57 
 58 struct nfc_ops {
 59         int (*dev_up)(struct nfc_dev *dev);
 60         int (*dev_down)(struct nfc_dev *dev);
 61         int (*start_poll)(struct nfc_dev *dev,
 62                           u32 im_protocols, u32 tm_protocols);
 63         void (*stop_poll)(struct nfc_dev *dev);
 64         int (*dep_link_up)(struct nfc_dev *dev, struct nfc_target *target,
 65                            u8 comm_mode, u8 *gb, size_t gb_len);
 66         int (*dep_link_down)(struct nfc_dev *dev);
 67         int (*activate_target)(struct nfc_dev *dev, struct nfc_target *target,
 68                                u32 protocol);
 69         void (*deactivate_target)(struct nfc_dev *dev,
 70                                   struct nfc_target *target);
 71         int (*im_transceive)(struct nfc_dev *dev, struct nfc_target *target,
 72                              struct sk_buff *skb, data_exchange_cb_t cb,
 73                              void *cb_context);
 74         int (*tm_send)(struct nfc_dev *dev, struct sk_buff *skb);
 75         int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target);
 76         int (*fw_download)(struct nfc_dev *dev, const char *firmware_name);
 77 
 78         /* Secure Element API */
 79         int (*discover_se)(struct nfc_dev *dev);
 80         int (*enable_se)(struct nfc_dev *dev, u32 se_idx);
 81         int (*disable_se)(struct nfc_dev *dev, u32 se_idx);
 82         int (*se_io) (struct nfc_dev *dev, u32 se_idx,
 83                       u8 *apdu, size_t apdu_length,
 84                       se_io_cb_t cb, void *cb_context);
 85 };
 86 
 87 #define NFC_TARGET_IDX_ANY -1
 88 #define NFC_MAX_GT_LEN 48
 89 #define NFC_ATR_RES_GT_OFFSET 15
 90 
 91 /**
 92  * struct nfc_target - NFC target descriptiom
 93  *
 94  * @sens_res: 2 bytes describing the target SENS_RES response, if the target
 95  *      is a type A one. The %sens_res most significant byte must be byte 2
 96  *      as described by the NFC Forum digital specification (i.e. the platform
 97  *      configuration one) while %sens_res least significant byte is byte 1.
 98  */
 99 struct nfc_target {
100         u32 idx;
101         u32 supported_protocols;
102         u16 sens_res;
103         u8 sel_res;
104         u8 nfcid1_len;
105         u8 nfcid1[NFC_NFCID1_MAXSIZE];
106         u8 nfcid2_len;
107         u8 nfcid2[NFC_NFCID2_MAXSIZE];
108         u8 sensb_res_len;
109         u8 sensb_res[NFC_SENSB_RES_MAXSIZE];
110         u8 sensf_res_len;
111         u8 sensf_res[NFC_SENSF_RES_MAXSIZE];
112         u8 hci_reader_gate;
113         u8 logical_idx;
114         u8 is_iso15693;
115         u8 iso15693_dsfid;
116         u8 iso15693_uid[NFC_ISO15693_UID_MAXSIZE];
117 };
118 
119 /**
120  * nfc_se - A structure for NFC accessible secure elements.
121  *
122  * @idx: The secure element index. User space will enable or
123  *       disable a secure element by its index.
124  * @type: The secure element type. It can be SE_UICC or
125  *        SE_EMBEDDED.
126  * @state: The secure element state, either enabled or disabled.
127  *
128  */
129 struct nfc_se {
130         struct list_head list;
131         u32 idx;
132         u16 type;
133         u16 state;
134 };
135 
136 struct nfc_genl_data {
137         u32 poll_req_portid;
138         struct mutex genl_data_mutex;
139 };
140 
141 struct nfc_dev {
142         int idx;
143         u32 target_next_idx;
144         struct nfc_target *targets;
145         int n_targets;
146         int targets_generation;
147         struct device dev;
148         bool dev_up;
149         bool fw_download_in_progress;
150         u8 rf_mode;
151         bool polling;
152         struct nfc_target *active_target;
153         bool dep_link_up;
154         struct nfc_genl_data genl_data;
155         u32 supported_protocols;
156 
157         struct list_head secure_elements;
158 
159         int tx_headroom;
160         int tx_tailroom;
161 
162         struct timer_list check_pres_timer;
163         struct work_struct check_pres_work;
164 
165         bool shutting_down;
166 
167         struct rfkill *rfkill;
168 
169         struct nfc_ops *ops;
170 };
171 #define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
172 
173 extern struct class nfc_class;
174 
175 struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
176                                     u32 supported_protocols,
177                                     int tx_headroom,
178                                     int tx_tailroom);
179 
180 /**
181  * nfc_free_device - free nfc device
182  *
183  * @dev: The nfc device to free
184  */
185 static inline void nfc_free_device(struct nfc_dev *dev)
186 {
187         put_device(&dev->dev);
188 }
189 
190 int nfc_register_device(struct nfc_dev *dev);
191 
192 void nfc_unregister_device(struct nfc_dev *dev);
193 
194 /**
195  * nfc_set_parent_dev - set the parent device
196  *
197  * @nfc_dev: The nfc device whose parent is being set
198  * @dev: The parent device
199  */
200 static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
201                                       struct device *dev)
202 {
203         nfc_dev->dev.parent = dev;
204 }
205 
206 /**
207  * nfc_set_drvdata - set driver specifc data
208  *
209  * @dev: The nfc device
210  * @data: Pointer to driver specifc data
211  */
212 static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
213 {
214         dev_set_drvdata(&dev->dev, data);
215 }
216 
217 /**
218  * nfc_get_drvdata - get driver specifc data
219  *
220  * @dev: The nfc device
221  */
222 static inline void *nfc_get_drvdata(struct nfc_dev *dev)
223 {
224         return dev_get_drvdata(&dev->dev);
225 }
226 
227 /**
228  * nfc_device_name - get the nfc device name
229  *
230  * @dev: The nfc device whose name to return
231  */
232 static inline const char *nfc_device_name(struct nfc_dev *dev)
233 {
234         return dev_name(&dev->dev);
235 }
236 
237 struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
238                                    unsigned int flags, unsigned int size,
239                                    unsigned int *err);
240 struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
241 
242 int nfc_set_remote_general_bytes(struct nfc_dev *dev,
243                                  u8 *gt, u8 gt_len);
244 u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len);
245 
246 int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
247                          u32 result);
248 
249 int nfc_targets_found(struct nfc_dev *dev,
250                       struct nfc_target *targets, int ntargets);
251 int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);
252 
253 int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
254                        u8 comm_mode, u8 rf_mode);
255 
256 int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
257                      u8 *gb, size_t gb_len);
258 int nfc_tm_deactivated(struct nfc_dev *dev);
259 int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb);
260 
261 void nfc_driver_failure(struct nfc_dev *dev, int err);
262 
263 int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type);
264 int nfc_remove_se(struct nfc_dev *dev, u32 se_idx);
265 struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx);
266 
267 #endif /* __NET_NFC_H */
268 

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