1/*
 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#include <linux/module.h>
26
27#include "nfc.h"
28
29static DEFINE_RWLOCK(proto_tab_lock);
30static const struct nfc_protocol *proto_tab[NFC_SOCKPROTO_MAX];
31
32static int nfc_sock_create(struct net *net, struct socket *sock, int proto,
33			   int kern)
34{
35	int rc = -EPROTONOSUPPORT;
36
37	if (net != &init_net)
38		return -EAFNOSUPPORT;
39
40	if (proto < 0 || proto >= NFC_SOCKPROTO_MAX)
41		return -EINVAL;
42
43	read_lock(&proto_tab_lock);
44	if (proto_tab[proto] &&	try_module_get(proto_tab[proto]->owner)) {
45		rc = proto_tab[proto]->create(net, sock, proto_tab[proto]);
46		module_put(proto_tab[proto]->owner);
47	}
48	read_unlock(&proto_tab_lock);
49
50	return rc;
51}
52
53static struct net_proto_family nfc_sock_family_ops = {
54	.owner  = THIS_MODULE,
55	.family = PF_NFC,
56	.create = nfc_sock_create,
57};
58
59int nfc_proto_register(const struct nfc_protocol *nfc_proto)
60{
61	int rc;
62
63	if (nfc_proto->id < 0 || nfc_proto->id >= NFC_SOCKPROTO_MAX)
64		return -EINVAL;
65
66	rc = proto_register(nfc_proto->proto, 0);
67	if (rc)
68		return rc;
69
70	write_lock(&proto_tab_lock);
71	if (proto_tab[nfc_proto->id])
72		rc = -EBUSY;
73	else
74		proto_tab[nfc_proto->id] = nfc_proto;
75	write_unlock(&proto_tab_lock);
76
77	return rc;
78}
79EXPORT_SYMBOL(nfc_proto_register);
80
81void nfc_proto_unregister(const struct nfc_protocol *nfc_proto)
82{
83	write_lock(&proto_tab_lock);
84	proto_tab[nfc_proto->id] = NULL;
85	write_unlock(&proto_tab_lock);
86
87	proto_unregister(nfc_proto->proto);
88}
89EXPORT_SYMBOL(nfc_proto_unregister);
90
91int __init af_nfc_init(void)
92{
93	return sock_register(&nfc_sock_family_ops);
94}
95
96void af_nfc_exit(void)
97{
98	sock_unregister(PF_NFC);
99}

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Copyright (C) 2011 Instituto Nokia de Tecnologia
 4 *
 5 * Authors:
 6 *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
 7 *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 8 */
 9
10#include <linux/nfc.h>
11#include <linux/module.h>
12
13#include "nfc.h"
14
15static DEFINE_RWLOCK(proto_tab_lock);
16static const struct nfc_protocol *proto_tab[NFC_SOCKPROTO_MAX];
17
18static int nfc_sock_create(struct net *net, struct socket *sock, int proto,
19			   int kern)
20{
21	int rc = -EPROTONOSUPPORT;
22
23	if (net != &init_net)
24		return -EAFNOSUPPORT;
25
26	if (proto < 0 || proto >= NFC_SOCKPROTO_MAX)
27		return -EINVAL;
28
29	read_lock(&proto_tab_lock);
30	if (proto_tab[proto] &&	try_module_get(proto_tab[proto]->owner)) {
31		rc = proto_tab[proto]->create(net, sock, proto_tab[proto], kern);
32		module_put(proto_tab[proto]->owner);
33	}
34	read_unlock(&proto_tab_lock);
35
36	return rc;
37}
38
39static const struct net_proto_family nfc_sock_family_ops = {
40	.owner  = THIS_MODULE,
41	.family = PF_NFC,
42	.create = nfc_sock_create,
43};
44
45int nfc_proto_register(const struct nfc_protocol *nfc_proto)
46{
47	int rc;
48
49	if (nfc_proto->id < 0 || nfc_proto->id >= NFC_SOCKPROTO_MAX)
50		return -EINVAL;
51
52	rc = proto_register(nfc_proto->proto, 0);
53	if (rc)
54		return rc;
55
56	write_lock(&proto_tab_lock);
57	if (proto_tab[nfc_proto->id])
58		rc = -EBUSY;
59	else
60		proto_tab[nfc_proto->id] = nfc_proto;
61	write_unlock(&proto_tab_lock);
62
63	return rc;
64}
65EXPORT_SYMBOL(nfc_proto_register);
66
67void nfc_proto_unregister(const struct nfc_protocol *nfc_proto)
68{
69	write_lock(&proto_tab_lock);
70	proto_tab[nfc_proto->id] = NULL;
71	write_unlock(&proto_tab_lock);
72
73	proto_unregister(nfc_proto->proto);
74}
75EXPORT_SYMBOL(nfc_proto_unregister);
76
77int __init af_nfc_init(void)
78{
79	return sock_register(&nfc_sock_family_ops);
80}
81
82void af_nfc_exit(void)
83{
84	sock_unregister(PF_NFC);
85}