100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2011 Instituto Nokia de Tecnologia
|
||
|
|
*
|
||
|
|
* Authors:
|
||
|
|
* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
|
||
|
|
* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the
|
||
|
|
* Free Software Foundation, Inc.,
|
||
|
|
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/nfc.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
|
||
|
|
#include "nfc.h"
|
||
|
|
|
||
|
|
static DEFINE_RWLOCK(proto_tab_lock);
|
||
|
|
static const struct nfc_protocol *proto_tab[NFC_SOCKPROTO_MAX];
|
||
|
|
|
||
|
|
static int nfc_sock_create(struct net *net, struct socket *sock, int proto,
|
||
|
|
int kern)
|
||
|
|
{
|
||
|
|
int rc = -EPROTONOSUPPORT;
|
||
|
|
|
||
|
|
if (net != &init_net)
|
||
|
|
return -EAFNOSUPPORT;
|
||
|
|
|
||
|
|
if (proto < 0 || proto >= NFC_SOCKPROTO_MAX)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
read_lock(&proto_tab_lock);
|
||
|
|
if (proto_tab[proto] && try_module_get(proto_tab[proto]->owner)) {
|
||
|
|
rc = proto_tab[proto]->create(net, sock, proto_tab[proto]);
|
||
|
|
module_put(proto_tab[proto]->owner);
|
||
|
|
}
|
||
|
|
read_unlock(&proto_tab_lock);
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct net_proto_family nfc_sock_family_ops = {
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.family = PF_NFC,
|
||
|
|
.create = nfc_sock_create,
|
||
|
|
};
|
||
|
|
|
||
|
|
int nfc_proto_register(const struct nfc_protocol *nfc_proto)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
if (nfc_proto->id < 0 || nfc_proto->id >= NFC_SOCKPROTO_MAX)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
rc = proto_register(nfc_proto->proto, 0);
|
||
|
|
if (rc)
|
||
|
|
return rc;
|
||
|
|
|
||
|
|
write_lock(&proto_tab_lock);
|
||
|
|
if (proto_tab[nfc_proto->id])
|
||
|
|
rc = -EBUSY;
|
||
|
|
else
|
||
|
|
proto_tab[nfc_proto->id] = nfc_proto;
|
||
|
|
write_unlock(&proto_tab_lock);
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(nfc_proto_register);
|
||
|
|
|
||
|
|
void nfc_proto_unregister(const struct nfc_protocol *nfc_proto)
|
||
|
|
{
|
||
|
|
write_lock(&proto_tab_lock);
|
||
|
|
proto_tab[nfc_proto->id] = NULL;
|
||
|
|
write_unlock(&proto_tab_lock);
|
||
|
|
|
||
|
|
proto_unregister(nfc_proto->proto);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(nfc_proto_unregister);
|
||
|
|
|
||
|
|
int __init af_nfc_init(void)
|
||
|
|
{
|
||
|
|
return sock_register(&nfc_sock_family_ops);
|
||
|
|
}
|
||
|
|
|
||
|
|
void af_nfc_exit(void)
|
||
|
|
{
|
||
|
|
sock_unregister(PF_NFC);
|
||
|
|
}
|