summaryrefslogtreecommitdiffstats
path: root/include/net/nfc/nfc.h
blob: dcfcfc9c00bf56a4cf1681333e56bb21c14b23d9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
/*
 * Copyright (C) 2011 Instituto Nokia de Tecnologia
 * Copyright (C) 2014 Marvell International Ltd.
 *
 * Authors:
 *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
 *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __NET_NFC_H
#define __NET_NFC_H

#include <linux/nfc.h>
#include <linux/device.h>
#include <linux/skbuff.h>

#define nfc_info(dev, fmt, ...) dev_info((dev), "NFC: " fmt, ##__VA_ARGS__)
#define nfc_err(dev, fmt, ...) dev_err((dev), "NFC: " fmt, ##__VA_ARGS__)

struct nfc_phy_ops {
	int (*write)(void *dev_id, struct sk_buff *skb);
	int (*enable)(void *dev_id);
	void (*disable)(void *dev_id);
};

struct nfc_dev;

/**
 * data_exchange_cb_t - Definition of nfc_data_exchange callback
 *
 * @context: nfc_data_exchange cb_context parameter
 * @skb: response data
 * @err: If an error has occurred during data exchange, it is the
 *	error number. Zero means no error.
 *
 * When a rx or tx package is lost or corrupted or the target gets out
 * of the operating field, err is -EIO.
 */
typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb,
								int err);

typedef void (*se_io_cb_t)(void *context, u8 *apdu, size_t apdu_len, int err);

struct nfc_target;

struct nfc_ops {
	int (*dev_up)(struct nfc_dev *dev);
	int (*dev_down)(struct nfc_dev *dev);
	int (*start_poll)(struct nfc_dev *dev,
			  u32 im_protocols, u32 tm_protocols);
	void (*stop_poll)(struct nfc_dev *dev);
	int (*dep_link_up)(struct nfc_dev *dev, struct nfc_target *target,
			   u8 comm_mode, u8 *gb, size_t gb_len);
	int (*dep_link_down)(struct nfc_dev *dev);
	int (*activate_target)(struct nfc_dev *dev, struct nfc_target *target,
			       u32 protocol);
	void (*deactivate_target)(struct nfc_dev *dev,
				  struct nfc_target *target, u8 mode);
	int (*im_transceive)(struct nfc_dev *dev, struct nfc_target *target,
			     struct sk_buff *skb, data_exchange_cb_t cb,
			     void *cb_context);
	int (*tm_send)(struct nfc_dev *dev, struct sk_buff *skb);
	int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target);
	int (*fw_download)(struct nfc_dev *dev, const char *firmware_name);

	/* Secure Element API */
	int (*discover_se)(struct nfc_dev *dev);
	int (*enable_se)(struct nfc_dev *dev, u32 se_idx);
	int (*disable_se)(struct nfc_dev *dev, u32 se_idx);
	int (*se_io) (struct nfc_dev *dev, u32 se_idx,
		      u8 *apdu, size_t apdu_length,
		      se_io_cb_t cb, void *cb_context);
};

#define NFC_TARGET_IDX_ANY -1
#define NFC_MAX_GT_LEN 48
#define NFC_ATR_RES_GT_OFFSET 15
#define NFC_ATR_REQ_GT_OFFSET 14

/**
 * struct nfc_target - NFC target descriptiom
 *
 * @sens_res: 2 bytes describing the target SENS_RES response, if the target
 *	is a type A one. The %sens_res most significant byte must be byte 2
 *	as described by the NFC Forum digital specification (i.e. the platform
 *	configuration one) while %sens_res least significant byte is byte 1.
 */
struct nfc_target {
	u32 idx;
	u32 supported_protocols;
	u16 sens_res;
	u8 sel_res;
	u8 nfcid1_len;
	u8 nfcid1[NFC_NFCID1_MAXSIZE];
	u8 nfcid2_len;
	u8 nfcid2[NFC_NFCID2_MAXSIZE];
	u8 sensb_res_len;
	u8 sensb_res[NFC_SENSB_RES_MAXSIZE];
	u8 sensf_res_len;
	u8 sensf_res[NFC_SENSF_RES_MAXSIZE];
	u8 hci_reader_gate;
	u8 logical_idx;
	u8 is_iso15693;
	u8 iso15693_dsfid;
	u8 iso15693_uid[NFC_ISO15693_UID_MAXSIZE];
};

/**
 * nfc_se - A structure for NFC accessible secure elements.
 *
 * @idx: The secure element index. User space will enable or
 *       disable a secure element by its index.
 * @type: The secure element type. It can be SE_UICC or
 *        SE_EMBEDDED.
 * @state: The secure element state, either enabled or disabled.
 *
 */
struct nfc_se {
	struct list_head list;
	u32 idx;
	u16 type;
	u16 state;
};

/**
 * nfc_evt_transaction - A struct for NFC secure element event transaction.
 *
 * @aid: The application identifier triggering the event
 *
 * @aid_len: The application identifier length [5:16]
 *
 * @params: The application parameters transmitted during the transaction
 *
 * @params_len: The applications parameters length [0:255]
 *
 */
#define NFC_MIN_AID_LENGTH	5
#define	NFC_MAX_AID_LENGTH	16
#define NFC_MAX_PARAMS_LENGTH	255

#define NFC_EVT_TRANSACTION_AID_TAG	0x81
#define NFC_EVT_TRANSACTION_PARAMS_TAG	0x82
struct nfc_evt_transaction {
	u32 aid_len;
	u8 aid[NFC_MAX_AID_LENGTH];
	u8 params_len;
	u8 params[0];
} __packed;

struct nfc_genl_data {
	u32 poll_req_portid;
	struct mutex genl_data_mutex;
};

struct nfc_vendor_cmd {
	__u32 vendor_id;
	__u32 subcmd;
	int (*doit)(struct nfc_dev *dev, void *data, size_t data_len);
};

struct nfc_dev {
	int idx;
	u32 target_next_idx;
	struct nfc_target *targets;
	int n_targets;
	int targets_generation;
	struct device dev;
	bool dev_up;
	bool fw_download_in_progress;
	u8 rf_mode;
	bool polling;
	struct nfc_target *active_target;
	bool dep_link_up;
	struct nfc_genl_data genl_data;
	u32 supported_protocols;

	struct list_head secure_elements;

	int tx_headroom;
	int tx_tailroom;

	struct timer_list check_pres_timer;
	struct work_struct check_pres_work;

	bool shutting_down;

	struct rfkill *rfkill;

	struct nfc_vendor_cmd *vendor_cmds;
	int n_vendor_cmds;

	struct nfc_ops *ops;
	struct genl_info *cur_cmd_info;
};
#define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)

extern struct class nfc_class;

struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
				    u32 supported_protocols,
				    int tx_headroom,
				    int tx_tailroom);

/**
 * nfc_free_device - free nfc device
 *
 * @dev: The nfc device to free
 */
static inline void nfc_free_device(struct nfc_dev *dev)
{
	put_device(&dev->dev);
}

int nfc_register_device(struct nfc_dev *dev);

void nfc_unregister_device(struct nfc_dev *dev);

/**
 * nfc_set_parent_dev - set the parent device
 *
 * @nfc_dev: The nfc device whose parent is being set
 * @dev: The parent device
 */
static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
				      struct device *dev)
{
	nfc_dev->dev.parent = dev;
}

/**
 * nfc_set_drvdata - set driver specifc data
 *
 * @dev: The nfc device
 * @data: Pointer to driver specifc data
 */
static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
{
	dev_set_drvdata(&dev->dev, data);
}

/**
 * nfc_get_drvdata - get driver specifc data
 *
 * @dev: The nfc device
 */
static inline void *nfc_get_drvdata(struct nfc_dev *dev)
{
	return dev_get_drvdata(&dev->dev);
}

/**
 * nfc_device_name - get the nfc device name
 *
 * @dev: The nfc device whose name to return
 */
static inline const char *nfc_device_name(struct nfc_dev *dev)
{
	return dev_name(&dev->dev);
}

struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
				   unsigned int flags, unsigned int size,
				   unsigned int *err);
struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);

int nfc_set_remote_general_bytes(struct nfc_dev *dev,
				 u8 *gt, u8 gt_len);
u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len);

int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
			 u32 result);

int nfc_targets_found(struct nfc_dev *dev,
		      struct nfc_target *targets, int ntargets);
int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);

int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
		       u8 comm_mode, u8 rf_mode);

int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
		     u8 *gb, size_t gb_len);
int nfc_tm_deactivated(struct nfc_dev *dev);
int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb);

void nfc_driver_failure(struct nfc_dev *dev, int err);

int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,
		       struct nfc_evt_transaction *evt_transaction);
int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type);
int nfc_remove_se(struct nfc_dev *dev, u32 se_idx);
struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx);

void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb,
			  u8 payload_type, u8 direction);

static inline int nfc_set_vendor_cmds(struct nfc_dev *dev,
				      struct nfc_vendor_cmd *cmds,
				      int n_cmds)
{
	if (dev->vendor_cmds || dev->n_vendor_cmds)
		return -EINVAL;

	dev->vendor_cmds = cmds;
	dev->n_vendor_cmds = n_cmds;

	return 0;
}

struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
						 enum nfc_attrs attr,
						 u32 oui, u32 subcmd,
						 int approxlen);
int nfc_vendor_cmd_reply(struct sk_buff *skb);

/**
 * nfc_vendor_cmd_alloc_reply_skb - allocate vendor command reply
 * @dev: nfc device
 * @oui: vendor oui
 * @approxlen: an upper bound of the length of the data that will
 *      be put into the skb
 *
 * This function allocates and pre-fills an skb for a reply to
 * a vendor command. Since it is intended for a reply, calling
 * it outside of a vendor command's doit() operation is invalid.
 *
 * The returned skb is pre-filled with some identifying data in
 * a way that any data that is put into the skb (with skb_put(),
 * nla_put() or similar) will end up being within the
 * %NFC_ATTR_VENDOR_DATA attribute, so all that needs to be done
 * with the skb is adding data for the corresponding userspace tool
 * which can then read that data out of the vendor data attribute.
 * You must not modify the skb in any other way.
 *
 * When done, call nfc_vendor_cmd_reply() with the skb and return
 * its error code as the result of the doit() operation.
 *
 * Return: An allocated and pre-filled skb. %NULL if any errors happen.
 */
static inline struct sk_buff *
nfc_vendor_cmd_alloc_reply_skb(struct nfc_dev *dev,
				u32 oui, u32 subcmd, int approxlen)
{
	return __nfc_alloc_vendor_cmd_reply_skb(dev,
						NFC_ATTR_VENDOR_DATA,
						oui,
						subcmd, approxlen);
}

#endif /* __NET_NFC_H */