| | 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 | |
| | 28 | static DEFINE_RWLOCK(proto_tab_lock); |
| | 29 | static const struct nfc_protocol *proto_tab[NFC_SOCKPROTO_MAX]; |
| | 30 | |
| | 31 | static 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 | |
| | 52 | static struct net_proto_family nfc_sock_family_ops = { |
| | 53 | .owner = THIS_MODULE, |
| | 54 | .family = PF_NFC, |
| | 55 | .create = nfc_sock_create, |
| | 56 | }; |
| | 57 | |
| | 58 | int 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 | } |
| | 78 | EXPORT_SYMBOL(nfc_proto_register); |
| | 79 | |
| | 80 | void 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 | } |
| | 88 | EXPORT_SYMBOL(nfc_proto_unregister); |
| | 89 | |
| | 90 | int __init af_nfc_init(void) |
| | 91 | { |
| | 92 | return sock_register(&nfc_sock_family_ops); |
| | 93 | } |
| | 94 | |
| | 95 | void af_nfc_exit(void) |
| | 96 | { |
| | 97 | sock_unregister(PF_NFC); |
| | 98 | } |
projects / mirror_ubuntu-bionic-kernel.git / blame_incremental