/*
 * 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, see <http://www.gnu.org/licenses/>.
 */

#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], kern);
		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);
}
remove'/><input type='hidden' name='id' value='4d1ceea8516cd6adf21f6b75995e2a7d4f376f9b'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=4d1ceea8516cd6adf21f6b75995e2a7d4f376f9b'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/include?h=nds-private-remove&amp;id=4d1ceea8516cd6adf21f6b75995e2a7d4f376f9b'>include</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/sound?h=nds-private-remove&amp;id=4d1ceea8516cd6adf21f6b75995e2a7d4f376f9b'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/sound/cs42l56.h?h=nds-private-remove&amp;id=4d1ceea8516cd6adf21f6b75995e2a7d4f376f9b'>cs42l56.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/include/sound/cs42l56.h?h=nds-private-remove&amp;id=4d1ceea8516cd6adf21f6b75995e2a7d4f376f9b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
ntent'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/pinctrl/stm32f429-pinfunc.h?h=nds-private-remove&amp;id=422e21e7619bb8751aa1cd32a9b671b1baaf3d18&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>