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Aloisio Almeida Jrc7fe3b52011-07-01 19:31:35 -03001/*
2 * Copyright (C) 2011 Instituto Nokia de Tecnologia
3 *
4 * Authors:
5 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
6 * Lauro Ramos Venancio <lauro.venancio@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#include <linux/nfc.h>
25
26#include "nfc.h"
27
28static DEFINE_RWLOCK(proto_tab_lock);
29static const struct nfc_protocol *proto_tab[NFC_SOCKPROTO_MAX];
30
31static int nfc_sock_create(struct net *net, struct socket *sock, int proto,
32 int kern)
33{
34 int rc = -EPROTONOSUPPORT;
35
36 if (net != &init_net)
37 return -EAFNOSUPPORT;
38
39 if (proto < 0 || proto >= NFC_SOCKPROTO_MAX)
40 return -EINVAL;
41
42 read_lock(&proto_tab_lock);
43 if (proto_tab[proto] && try_module_get(proto_tab[proto]->owner)) {
44 rc = proto_tab[proto]->create(net, sock, proto_tab[proto]);
45 module_put(proto_tab[proto]->owner);
46 }
47 read_unlock(&proto_tab_lock);
48
49 return rc;
50}
51
52static struct net_proto_family nfc_sock_family_ops = {
53 .owner = THIS_MODULE,
54 .family = PF_NFC,
55 .create = nfc_sock_create,
56};
57
58int nfc_proto_register(const struct nfc_protocol *nfc_proto)
59{
60 int rc;
61
62 if (nfc_proto->id < 0 || nfc_proto->id >= NFC_SOCKPROTO_MAX)
63 return -EINVAL;
64
65 rc = proto_register(nfc_proto->proto, 0);
66 if (rc)
67 return rc;
68
69 write_lock(&proto_tab_lock);
70 if (proto_tab[nfc_proto->id])
71 rc = -EBUSY;
72 else
73 proto_tab[nfc_proto->id] = nfc_proto;
74 write_unlock(&proto_tab_lock);
75
76 return rc;
77}
78EXPORT_SYMBOL(nfc_proto_register);
79
80void nfc_proto_unregister(const struct nfc_protocol *nfc_proto)
81{
82 write_lock(&proto_tab_lock);
83 proto_tab[nfc_proto->id] = NULL;
84 write_unlock(&proto_tab_lock);
85
86 proto_unregister(nfc_proto->proto);
87}
88EXPORT_SYMBOL(nfc_proto_unregister);
89
90int __init af_nfc_init(void)
91{
92 return sock_register(&nfc_sock_family_ops);
93}
94
95void af_nfc_exit(void)
96{
97 sock_unregister(PF_NFC);
98}