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88 lines
1.8 KiB
88 lines
1.8 KiB
// 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 <[email protected]> |
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* Lauro Ramos Venancio <[email protected]> |
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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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if (rc) |
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proto_unregister(nfc_proto->proto); |
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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 __exit af_nfc_exit(void) |
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{ |
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sock_unregister(PF_NFC); |
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}
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