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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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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> | |
c7fe3b52 AAJ |
8 | */ |
9 | ||
10 | #include <linux/nfc.h> | |
3a9a231d | 11 | #include <linux/module.h> |
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12 | |
13 | #include "nfc.h" | |
14 | ||
15 | static DEFINE_RWLOCK(proto_tab_lock); | |
16 | static const struct nfc_protocol *proto_tab[NFC_SOCKPROTO_MAX]; | |
17 | ||
18 | static int nfc_sock_create(struct net *net, struct socket *sock, int proto, | |
0a40acb2 | 19 | int kern) |
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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)) { | |
11aa9c28 | 31 | rc = proto_tab[proto]->create(net, sock, proto_tab[proto], kern); |
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32 | module_put(proto_tab[proto]->owner); |
33 | } | |
34 | read_unlock(&proto_tab_lock); | |
35 | ||
36 | return rc; | |
37 | } | |
38 | ||
173e7837 | 39 | static const struct net_proto_family nfc_sock_family_ops = { |
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40 | .owner = THIS_MODULE, |
41 | .family = PF_NFC, | |
42 | .create = nfc_sock_create, | |
43 | }; | |
44 | ||
45 | int 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 | ||
0911ab31 ZX |
63 | if (rc) |
64 | proto_unregister(nfc_proto->proto); | |
65 | ||
c7fe3b52 AAJ |
66 | return rc; |
67 | } | |
68 | EXPORT_SYMBOL(nfc_proto_register); | |
69 | ||
70 | void 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 | } | |
78 | EXPORT_SYMBOL(nfc_proto_unregister); | |
79 | ||
80 | int __init af_nfc_init(void) | |
81 | { | |
82 | return sock_register(&nfc_sock_family_ops); | |
83 | } | |
84 | ||
bf6cd772 | 85 | void __exit af_nfc_exit(void) |
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86 | { |
87 | sock_unregister(PF_NFC); | |
88 | } |