projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| c7fe3b52 AAJ |
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 | } |