86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2011 Instituto Nokia de Tecnologia
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*
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* Authors:
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* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
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* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
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*/
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#include <linux/nfc.h>
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#include <linux/module.h>
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#include "nfc.h"
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static DEFINE_RWLOCK(proto_tab_lock);
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static const struct nfc_protocol *proto_tab[NFC_SOCKPROTO_MAX];
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static int nfc_sock_create(struct net *net, struct socket *sock, int proto,
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int kern)
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{
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int rc = -EPROTONOSUPPORT;
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if (net != &init_net)
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return -EAFNOSUPPORT;
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if (proto < 0 || proto >= NFC_SOCKPROTO_MAX)
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return -EINVAL;
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read_lock(&proto_tab_lock);
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if (proto_tab[proto] && try_module_get(proto_tab[proto]->owner)) {
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rc = proto_tab[proto]->create(net, sock, proto_tab[proto], kern);
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module_put(proto_tab[proto]->owner);
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}
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read_unlock(&proto_tab_lock);
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return rc;
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}
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static const struct net_proto_family nfc_sock_family_ops = {
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.owner = THIS_MODULE,
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.family = PF_NFC,
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.create = nfc_sock_create,
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};
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int nfc_proto_register(const struct nfc_protocol *nfc_proto)
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{
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int rc;
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if (nfc_proto->id < 0 || nfc_proto->id >= NFC_SOCKPROTO_MAX)
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return -EINVAL;
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rc = proto_register(nfc_proto->proto, 0);
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if (rc)
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return rc;
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write_lock(&proto_tab_lock);
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if (proto_tab[nfc_proto->id])
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rc = -EBUSY;
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else
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proto_tab[nfc_proto->id] = nfc_proto;
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write_unlock(&proto_tab_lock);
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return rc;
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}
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EXPORT_SYMBOL(nfc_proto_register);
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void nfc_proto_unregister(const struct nfc_protocol *nfc_proto)
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{
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write_lock(&proto_tab_lock);
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proto_tab[nfc_proto->id] = NULL;
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write_unlock(&proto_tab_lock);
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proto_unregister(nfc_proto->proto);
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}
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EXPORT_SYMBOL(nfc_proto_unregister);
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int __init af_nfc_init(void)
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{
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return sock_register(&nfc_sock_family_ops);
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}
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void af_nfc_exit(void)
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{
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sock_unregister(PF_NFC);
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}
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