Eric Lee / smarc-fsl-linux-kernel

Blame view

net/nfc/af_nfc.c 2.43 KB
edit raw normal view history
c7fe3b52c   Aloisio Almeida Jr   NFC: add NFC sock... 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
 
  /*
   * 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>
3a9a231d9   Paul Gortmaker   net: Fix files ex... 
25
 
  #include <linux/module.h>
c7fe3b52c   Aloisio Almeida Jr   NFC: add NFC sock... 
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
 
  
  #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);
  }