a6a7b49a3e2db68587d5cff8007c23569d326f1e
[deliverable/linux.git] / 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_target;
52
53 struct nfc_ops {
54 int (*dev_up)(struct nfc_dev *dev);
55 int (*dev_down)(struct nfc_dev *dev);
56 int (*start_poll)(struct nfc_dev *dev,
57 u32 im_protocols, u32 tm_protocols);
58 void (*stop_poll)(struct nfc_dev *dev);
59 int (*dep_link_up)(struct nfc_dev *dev, struct nfc_target *target,
60 u8 comm_mode, u8 *gb, size_t gb_len);
61 int (*dep_link_down)(struct nfc_dev *dev);
62 int (*activate_target)(struct nfc_dev *dev, struct nfc_target *target,
63 u32 protocol);
64 void (*deactivate_target)(struct nfc_dev *dev,
65 struct nfc_target *target);
66 int (*data_exchange)(struct nfc_dev *dev, struct nfc_target *target,
67 struct sk_buff *skb, data_exchange_cb_t cb,
68 void *cb_context);
69 int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target);
70 };
71
72 #define NFC_TARGET_IDX_ANY -1
73 #define NFC_MAX_GT_LEN 48
74
75 struct nfc_target {
76 u32 idx;
77 u32 supported_protocols;
78 u16 sens_res;
79 u8 sel_res;
80 u8 nfcid1_len;
81 u8 nfcid1[NFC_NFCID1_MAXSIZE];
82 u8 sensb_res_len;
83 u8 sensb_res[NFC_SENSB_RES_MAXSIZE];
84 u8 sensf_res_len;
85 u8 sensf_res[NFC_SENSF_RES_MAXSIZE];
86 u8 hci_reader_gate;
87 u8 logical_idx;
88 };
89
90 struct nfc_genl_data {
91 u32 poll_req_pid;
92 struct mutex genl_data_mutex;
93 };
94
95 struct nfc_dev {
96 unsigned int idx;
97 u32 target_next_idx;
98 struct nfc_target *targets;
99 int n_targets;
100 int targets_generation;
101 struct device dev;
102 bool dev_up;
103 u8 rf_mode;
104 bool polling;
105 struct nfc_target *active_target;
106 bool dep_link_up;
107 struct nfc_genl_data genl_data;
108 u32 supported_protocols;
109
110 int tx_headroom;
111 int tx_tailroom;
112
113 struct timer_list check_pres_timer;
114 struct workqueue_struct *check_pres_wq;
115 struct work_struct check_pres_work;
116
117 struct nfc_ops *ops;
118 };
119 #define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
120
121 extern struct class nfc_class;
122
123 struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
124 u32 supported_protocols,
125 int tx_headroom,
126 int tx_tailroom);
127
128 /**
129 * nfc_free_device - free nfc device
130 *
131 * @dev: The nfc device to free
132 */
133 static inline void nfc_free_device(struct nfc_dev *dev)
134 {
135 put_device(&dev->dev);
136 }
137
138 int nfc_register_device(struct nfc_dev *dev);
139
140 void nfc_unregister_device(struct nfc_dev *dev);
141
142 /**
143 * nfc_set_parent_dev - set the parent device
144 *
145 * @nfc_dev: The nfc device whose parent is being set
146 * @dev: The parent device
147 */
148 static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
149 struct device *dev)
150 {
151 nfc_dev->dev.parent = dev;
152 }
153
154 /**
155 * nfc_set_drvdata - set driver specifc data
156 *
157 * @dev: The nfc device
158 * @data: Pointer to driver specifc data
159 */
160 static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
161 {
162 dev_set_drvdata(&dev->dev, data);
163 }
164
165 /**
166 * nfc_get_drvdata - get driver specifc data
167 *
168 * @dev: The nfc device
169 */
170 static inline void *nfc_get_drvdata(struct nfc_dev *dev)
171 {
172 return dev_get_drvdata(&dev->dev);
173 }
174
175 /**
176 * nfc_device_name - get the nfc device name
177 *
178 * @dev: The nfc device whose name to return
179 */
180 static inline const char *nfc_device_name(struct nfc_dev *dev)
181 {
182 return dev_name(&dev->dev);
183 }
184
185 struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
186 unsigned int flags, unsigned int size,
187 unsigned int *err);
188 struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
189
190 int nfc_set_remote_general_bytes(struct nfc_dev *dev,
191 u8 *gt, u8 gt_len);
192 u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len);
193
194 int nfc_targets_found(struct nfc_dev *dev,
195 struct nfc_target *targets, int ntargets);
196 int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);
197
198 int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
199 u8 comm_mode, u8 rf_mode);
200
201 int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
202 u8 *gb, size_t gb_len);
203 int nfc_tm_deactivated(struct nfc_dev *dev);
204
205 #endif /* __NET_NFC_H */
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