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
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}

 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	if (rc)
64		proto_unregister(nfc_proto->proto);
65
66	return rc;
67}
68EXPORT_SYMBOL(nfc_proto_register);
69
70void nfc_proto_unregister(const struct nfc_protocol *nfc_proto)
71{
72	write_lock(&proto_tab_lock);
73	proto_tab[nfc_proto->id] = NULL;
74	write_unlock(&proto_tab_lock);
75
76	proto_unregister(nfc_proto->proto);
77}
78EXPORT_SYMBOL(nfc_proto_unregister);
79
80int __init af_nfc_init(void)
81{
82	return sock_register(&nfc_sock_family_ops);
83}
84
85void __exit af_nfc_exit(void)
86{
87	sock_unregister(PF_NFC);
88}