[deliverable/linux.git] / net / nfc / netlink.c

/*
 * Copyright (C) 2011 Instituto Nokia de Tecnologia
 *
 * Authors:
 *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
 *    Aloisio Almeida Jr <aloisio.almeida@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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__

#include <net/genetlink.h>
#include <linux/nfc.h>
#include <linux/slab.h>

#include "nfc.h"

static struct genl_multicast_group nfc_genl_event_mcgrp = {
	.name = NFC_GENL_MCAST_EVENT_NAME,
};

struct genl_family nfc_genl_family = {
	.id = GENL_ID_GENERATE,
	.hdrsize = 0,
	.name = NFC_GENL_NAME,
	.version = NFC_GENL_VERSION,
	.maxattr = NFC_ATTR_MAX,
};

static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
	[NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
	[NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
				.len = NFC_DEVICE_NAME_MAXSIZE },
	[NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
	[NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
	[NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
	[NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
};

static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
				struct netlink_callback *cb, int flags)
{
	void *hdr;

	hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
			  &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
	if (!hdr)
		return -EMSGSIZE;

	genl_dump_check_consistent(cb, hdr, &nfc_genl_family);

	NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target->idx);
	NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols);
	NLA_PUT_U16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res);
	NLA_PUT_U8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res);
	if (target->nfcid1_len > 0)
		NLA_PUT(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
			target->nfcid1);
	if (target->sensb_res_len > 0)
		NLA_PUT(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
			target->sensb_res);
	if (target->sensf_res_len > 0)
		NLA_PUT(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
			target->sensf_res);

	return genlmsg_end(msg, hdr);

nla_put_failure:
	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
}

static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
{
	struct nfc_dev *dev;
	int rc;
	u32 idx;

	rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
			 nfc_genl_family.attrbuf,
			 nfc_genl_family.maxattr,
			 nfc_genl_policy);
	if (rc < 0)
		return ERR_PTR(rc);

	if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
		return ERR_PTR(-EINVAL);

	idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);

	dev = nfc_get_device(idx);
	if (!dev)
		return ERR_PTR(-ENODEV);

	return dev;
}

static int nfc_genl_dump_targets(struct sk_buff *skb,
				 struct netlink_callback *cb)
{
	int i = cb->args[0];
	struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
	int rc;

	if (!dev) {
		dev = __get_device_from_cb(cb);
		if (IS_ERR(dev))
			return PTR_ERR(dev);

		cb->args[1] = (long) dev;
	}

	spin_lock_bh(&dev->targets_lock);

	cb->seq = dev->targets_generation;

	while (i < dev->n_targets) {
		rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
					  NLM_F_MULTI);
		if (rc < 0)
			break;

		i++;
	}

	spin_unlock_bh(&dev->targets_lock);

	cb->args[0] = i;

	return skb->len;
}

static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
{
	struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];

	if (dev)
		nfc_put_device(dev);

	return 0;
}

int nfc_genl_targets_found(struct nfc_dev *dev)
{
	struct sk_buff *msg;
	void *hdr;

	dev->genl_data.poll_req_pid = 0;

	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!msg)
		return -ENOMEM;

	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
			  NFC_EVENT_TARGETS_FOUND);
	if (!hdr)
		goto free_msg;

	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);

	genlmsg_end(msg, hdr);

	return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);

nla_put_failure:
	genlmsg_cancel(msg, hdr);
free_msg:
	nlmsg_free(msg);
	return -EMSGSIZE;
}

int nfc_genl_device_added(struct nfc_dev *dev)
{
	struct sk_buff *msg;
	void *hdr;

	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
			  NFC_EVENT_DEVICE_ADDED);
	if (!hdr)
		goto free_msg;

	NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
	NLA_PUT_U8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up);

	genlmsg_end(msg, hdr);

	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);

	return 0;

nla_put_failure:
	genlmsg_cancel(msg, hdr);
free_msg:
	nlmsg_free(msg);
	return -EMSGSIZE;
}

int nfc_genl_device_removed(struct nfc_dev *dev)
{
	struct sk_buff *msg;
	void *hdr;

	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
			  NFC_EVENT_DEVICE_REMOVED);
	if (!hdr)
		goto free_msg;

	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);

	genlmsg_end(msg, hdr);

	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);

	return 0;

nla_put_failure:
	genlmsg_cancel(msg, hdr);
free_msg:
	nlmsg_free(msg);
	return -EMSGSIZE;
}

static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
				u32 pid, u32 seq,
				struct netlink_callback *cb,
				int flags)
{
	void *hdr;

	hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
			  NFC_CMD_GET_DEVICE);
	if (!hdr)
		return -EMSGSIZE;

	if (cb)
		genl_dump_check_consistent(cb, hdr, &nfc_genl_family);

	NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
	NLA_PUT_U8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up);

	return genlmsg_end(msg, hdr);

nla_put_failure:
	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
}

static int nfc_genl_dump_devices(struct sk_buff *skb,
				 struct netlink_callback *cb)
{
	struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
	struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
	bool first_call = false;

	if (!iter) {
		first_call = true;
		iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
		if (!iter)
			return -ENOMEM;
		cb->args[0] = (long) iter;
	}

	mutex_lock(&nfc_devlist_mutex);

	cb->seq = nfc_devlist_generation;

	if (first_call) {
		nfc_device_iter_init(iter);
		dev = nfc_device_iter_next(iter);
	}

	while (dev) {
		int rc;

		rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
					  cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
		if (rc < 0)
			break;

		dev = nfc_device_iter_next(iter);
	}

	mutex_unlock(&nfc_devlist_mutex);

	cb->args[1] = (long) dev;

	return skb->len;
}

static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
{
	struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];

	nfc_device_iter_exit(iter);
	kfree(iter);

	return 0;
}

int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
			       u8 comm_mode, u8 rf_mode)
{
	struct sk_buff *msg;
	void *hdr;

	pr_debug("DEP link is up\n");

	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!msg)
		return -ENOMEM;

	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
	if (!hdr)
		goto free_msg;

	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	if (rf_mode == NFC_RF_INITIATOR)
		NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target_idx);
	NLA_PUT_U8(msg, NFC_ATTR_COMM_MODE, comm_mode);
	NLA_PUT_U8(msg, NFC_ATTR_RF_MODE, rf_mode);

	genlmsg_end(msg, hdr);

	dev->dep_link_up = true;

	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);

	return 0;

nla_put_failure:
	genlmsg_cancel(msg, hdr);
free_msg:
	nlmsg_free(msg);
	return -EMSGSIZE;
}

int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
{
	struct sk_buff *msg;
	void *hdr;

	pr_debug("DEP link is down\n");

	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!msg)
		return -ENOMEM;

	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
			  NFC_CMD_DEP_LINK_DOWN);
	if (!hdr)
		goto free_msg;

	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);

	genlmsg_end(msg, hdr);

	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);

	return 0;

nla_put_failure:
	genlmsg_cancel(msg, hdr);
free_msg:
	nlmsg_free(msg);
	return -EMSGSIZE;
}

static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *msg;
	struct nfc_dev *dev;
	u32 idx;
	int rc = -ENOBUFS;

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
		return -EINVAL;

	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);

	dev = nfc_get_device(idx);
	if (!dev)
		return -ENODEV;

	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!msg) {
		rc = -ENOMEM;
		goto out_putdev;
	}

	rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
				  NULL, 0);
	if (rc < 0)
		goto out_free;

	nfc_put_device(dev);

	return genlmsg_reply(msg, info);

out_free:
	nlmsg_free(msg);
out_putdev:
	nfc_put_device(dev);
	return rc;
}

static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
{
	struct nfc_dev *dev;
	int rc;
	u32 idx;

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
		return -EINVAL;

	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);

	dev = nfc_get_device(idx);
	if (!dev)
		return -ENODEV;

	rc = nfc_dev_up(dev);

	nfc_put_device(dev);
	return rc;
}

static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
{
	struct nfc_dev *dev;
	int rc;
	u32 idx;

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
		return -EINVAL;

	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);

	dev = nfc_get_device(idx);
	if (!dev)
		return -ENODEV;

	rc = nfc_dev_down(dev);

	nfc_put_device(dev);
	return rc;
}

static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
{
	struct nfc_dev *dev;
	int rc;
	u32 idx;
	u32 protocols;

	pr_debug("Poll start\n");

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
	    !info->attrs[NFC_ATTR_PROTOCOLS])
		return -EINVAL;

	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);

	dev = nfc_get_device(idx);
	if (!dev)
		return -ENODEV;

	mutex_lock(&dev->genl_data.genl_data_mutex);

	rc = nfc_start_poll(dev, protocols);
	if (!rc)
		dev->genl_data.poll_req_pid = info->snd_pid;

	mutex_unlock(&dev->genl_data.genl_data_mutex);

	nfc_put_device(dev);
	return rc;
}

static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
{
	struct nfc_dev *dev;
	int rc;
	u32 idx;

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
		return -EINVAL;

	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);

	dev = nfc_get_device(idx);
	if (!dev)
		return -ENODEV;

	mutex_lock(&dev->genl_data.genl_data_mutex);

	if (dev->genl_data.poll_req_pid != info->snd_pid) {
		rc = -EBUSY;
		goto out;
	}

	rc = nfc_stop_poll(dev);
	dev->genl_data.poll_req_pid = 0;

out:
	mutex_unlock(&dev->genl_data.genl_data_mutex);
	nfc_put_device(dev);
	return rc;
}

static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
{
	struct nfc_dev *dev;
	int rc, tgt_idx;
	u32 idx;
	u8 comm;

	pr_debug("DEP link up\n");

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
	    !info->attrs[NFC_ATTR_COMM_MODE])
		return -EINVAL;

	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	if (!info->attrs[NFC_ATTR_TARGET_INDEX])
		tgt_idx = NFC_TARGET_IDX_ANY;
	else
		tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);

	comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);

	if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
		return -EINVAL;

	dev = nfc_get_device(idx);
	if (!dev)
		return -ENODEV;

	rc = nfc_dep_link_up(dev, tgt_idx, comm);

	nfc_put_device(dev);

	return rc;
}

static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
{
	struct nfc_dev *dev;
	int rc;
	u32 idx;

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
		return -EINVAL;

	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);

	dev = nfc_get_device(idx);
	if (!dev)
		return -ENODEV;

	rc = nfc_dep_link_down(dev);

	nfc_put_device(dev);
	return rc;
}

static struct genl_ops nfc_genl_ops[] = {
	{
		.cmd = NFC_CMD_GET_DEVICE,
		.doit = nfc_genl_get_device,
		.dumpit = nfc_genl_dump_devices,
		.done = nfc_genl_dump_devices_done,
		.policy = nfc_genl_policy,
	},
	{
		.cmd = NFC_CMD_DEV_UP,
		.doit = nfc_genl_dev_up,
		.policy = nfc_genl_policy,
	},
	{
		.cmd = NFC_CMD_DEV_DOWN,
		.doit = nfc_genl_dev_down,
		.policy = nfc_genl_policy,
	},
	{
		.cmd = NFC_CMD_START_POLL,
		.doit = nfc_genl_start_poll,
		.policy = nfc_genl_policy,
	},
	{
		.cmd = NFC_CMD_STOP_POLL,
		.doit = nfc_genl_stop_poll,
		.policy = nfc_genl_policy,
	},
	{
		.cmd = NFC_CMD_DEP_LINK_UP,
		.doit = nfc_genl_dep_link_up,
		.policy = nfc_genl_policy,
	},
	{
		.cmd = NFC_CMD_DEP_LINK_DOWN,
		.doit = nfc_genl_dep_link_down,
		.policy = nfc_genl_policy,
	},
	{
		.cmd = NFC_CMD_GET_TARGET,
		.dumpit = nfc_genl_dump_targets,
		.done = nfc_genl_dump_targets_done,
		.policy = nfc_genl_policy,
	},
};

static int nfc_genl_rcv_nl_event(struct notifier_block *this,
				 unsigned long event, void *ptr)
{
	struct netlink_notify *n = ptr;
	struct class_dev_iter iter;
	struct nfc_dev *dev;

	if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
		goto out;

	pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);

	nfc_device_iter_init(&iter);
	dev = nfc_device_iter_next(&iter);

	while (dev) {
		if (dev->genl_data.poll_req_pid == n->pid) {
			nfc_stop_poll(dev);
			dev->genl_data.poll_req_pid = 0;
		}
		dev = nfc_device_iter_next(&iter);
	}

	nfc_device_iter_exit(&iter);

out:
	return NOTIFY_DONE;
}

void nfc_genl_data_init(struct nfc_genl_data *genl_data)
{
	genl_data->poll_req_pid = 0;
	mutex_init(&genl_data->genl_data_mutex);
}

void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
{
	mutex_destroy(&genl_data->genl_data_mutex);
}

static struct notifier_block nl_notifier = {
	.notifier_call  = nfc_genl_rcv_nl_event,
};

/**
 * nfc_genl_init() - Initialize netlink interface
 *
 * This initialization function registers the nfc netlink family.
 */
int __init nfc_genl_init(void)
{
	int rc;

	rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
					   ARRAY_SIZE(nfc_genl_ops));
	if (rc)
		return rc;

	rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);

	netlink_register_notifier(&nl_notifier);

	return rc;
}

/**
 * nfc_genl_exit() - Deinitialize netlink interface
 *
 * This exit function unregisters the nfc netlink family.
 */
void nfc_genl_exit(void)
{
	netlink_unregister_notifier(&nl_notifier);
	genl_unregister_family(&nfc_genl_family);
}
Commit	Line	Data
4d12b8b1 LRV	1	/*
	2	* Copyright (C) 2011 Instituto Nokia de Tecnologia
	3	*
	4	* Authors:
	5	* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
	6	* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the
	20	* Free Software Foundation, Inc.,
	21	* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	22	*/
	23
52858b51	24	#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
20c239c1	25
4d12b8b1 LRV	26	#include <net/genetlink.h>
	27	#include <linux/nfc.h>
	28	#include <linux/slab.h>
	29
	30	#include "nfc.h"
	31
	32	static struct genl_multicast_group nfc_genl_event_mcgrp = {
	33	.name = NFC_GENL_MCAST_EVENT_NAME,
	34	};
	35
	36	struct genl_family nfc_genl_family = {
	37	.id = GENL_ID_GENERATE,
	38	.hdrsize = 0,
	39	.name = NFC_GENL_NAME,
	40	.version = NFC_GENL_VERSION,
	41	.maxattr = NFC_ATTR_MAX,
	42	};
	43
	44	static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
	45	[NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
	46	[NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
	47	.len = NFC_DEVICE_NAME_MAXSIZE },
	48	[NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
1ed28f61 SO	49	[NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
1ed28f61 SO	50	[NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
c970a1ac	51	[NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
4d12b8b1 LRV	52	};
	53
	54	static int nfc_genl_send_target(struct sk_buff msg, struct nfc_target target,
0a40acb2	55	struct netlink_callback *cb, int flags)
4d12b8b1 LRV	56	{
	57	void *hdr;
	58
4d12b8b1	59	hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
0a40acb2	60	&nfc_genl_family, flags, NFC_CMD_GET_TARGET);
4d12b8b1 LRV	61	if (!hdr)
	62	return -EMSGSIZE;
	63
	64	genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
	65
	66	NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target->idx);
0a40acb2	67	NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols);
4d12b8b1 LRV	68	NLA_PUT_U16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res);
4d12b8b1 LRV	69	NLA_PUT_U8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res);
288e0713 IE	70	if (target->nfcid1_len > 0)
288e0713 IE	71	NLA_PUT(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
0a40acb2	72	target->nfcid1);
d5a2ca60 IE	73	if (target->sensb_res_len > 0)
d5a2ca60 IE	74	NLA_PUT(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
0a40acb2	75	target->sensb_res);
d5a2ca60 IE	76	if (target->sensf_res_len > 0)
d5a2ca60 IE	77	NLA_PUT(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
0a40acb2	78	target->sensf_res);
4d12b8b1 LRV	79
	80	return genlmsg_end(msg, hdr);
	81
	82	nla_put_failure:
	83	genlmsg_cancel(msg, hdr);
	84	return -EMSGSIZE;
	85	}
	86
	87	static struct nfc_dev __get_device_from_cb(struct netlink_callback cb)
	88	{
	89	struct nfc_dev *dev;
	90	int rc;
	91	u32 idx;
	92
	93	rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
0a40acb2 SO	94	nfc_genl_family.attrbuf,
	95	nfc_genl_family.maxattr,
	96	nfc_genl_policy);
4d12b8b1 LRV	97	if (rc < 0)
	98	return ERR_PTR(rc);
	99
	100	if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
	101	return ERR_PTR(-EINVAL);
	102
	103	idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
	104
	105	dev = nfc_get_device(idx);
	106	if (!dev)
	107	return ERR_PTR(-ENODEV);
	108
	109	return dev;
	110	}
	111
	112	static int nfc_genl_dump_targets(struct sk_buff *skb,
0a40acb2	113	struct netlink_callback *cb)
4d12b8b1 LRV	114	{
	115	int i = cb->args[0];
	116	struct nfc_dev dev = (struct nfc_dev ) cb->args[1];
	117	int rc;
	118
4d12b8b1 LRV	119	if (!dev) {
	120	dev = __get_device_from_cb(cb);
	121	if (IS_ERR(dev))
	122	return PTR_ERR(dev);
	123
	124	cb->args[1] = (long) dev;
	125	}
	126
	127	spin_lock_bh(&dev->targets_lock);
	128
	129	cb->seq = dev->targets_generation;
	130
	131	while (i < dev->n_targets) {
	132	rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
0a40acb2	133	NLM_F_MULTI);
4d12b8b1 LRV	134	if (rc < 0)
	135	break;
	136
	137	i++;
	138	}
	139
	140	spin_unlock_bh(&dev->targets_lock);
	141
	142	cb->args[0] = i;
	143
	144	return skb->len;
	145	}
	146
	147	static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
	148	{
	149	struct nfc_dev dev = (struct nfc_dev ) cb->args[1];
	150
4d12b8b1 LRV	151	if (dev)
	152	nfc_put_device(dev);
	153
	154	return 0;
	155	}
	156
	157	int nfc_genl_targets_found(struct nfc_dev *dev)
	158	{
	159	struct sk_buff *msg;
	160	void *hdr;
	161
4d12b8b1 LRV	162	dev->genl_data.poll_req_pid = 0;
	163
	164	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	165	if (!msg)
	166	return -ENOMEM;
	167
	168	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2	169	NFC_EVENT_TARGETS_FOUND);
4d12b8b1 LRV	170	if (!hdr)
	171	goto free_msg;
	172
	173	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	174
	175	genlmsg_end(msg, hdr);
	176
	177	return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
	178
	179	nla_put_failure:
	180	genlmsg_cancel(msg, hdr);
	181	free_msg:
	182	nlmsg_free(msg);
	183	return -EMSGSIZE;
	184	}
	185
	186	int nfc_genl_device_added(struct nfc_dev *dev)
	187	{
	188	struct sk_buff *msg;
	189	void *hdr;
	190
4d12b8b1 LRV	191	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	192	if (!msg)
	193	return -ENOMEM;
	194
	195	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2	196	NFC_EVENT_DEVICE_ADDED);
4d12b8b1 LRV	197	if (!hdr)
	198	goto free_msg;
	199
	200	NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
	201	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	202	NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
c970a1ac	203	NLA_PUT_U8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up);
4d12b8b1 LRV	204
	205	genlmsg_end(msg, hdr);
	206
	207	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
	208
	209	return 0;
	210
	211	nla_put_failure:
	212	genlmsg_cancel(msg, hdr);
	213	free_msg:
	214	nlmsg_free(msg);
	215	return -EMSGSIZE;
	216	}
	217
	218	int nfc_genl_device_removed(struct nfc_dev *dev)
	219	{
	220	struct sk_buff *msg;
	221	void *hdr;
	222
4d12b8b1 LRV	223	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	224	if (!msg)
	225	return -ENOMEM;
	226
	227	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2	228	NFC_EVENT_DEVICE_REMOVED);
4d12b8b1 LRV	229	if (!hdr)
	230	goto free_msg;
	231
	232	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	233
	234	genlmsg_end(msg, hdr);
	235
	236	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
	237
	238	return 0;
	239
	240	nla_put_failure:
	241	genlmsg_cancel(msg, hdr);
	242	free_msg:
	243	nlmsg_free(msg);
	244	return -EMSGSIZE;
	245	}
	246
	247	static int nfc_genl_send_device(struct sk_buff msg, struct nfc_dev dev,
0a40acb2 SO	248	u32 pid, u32 seq,
	249	struct netlink_callback *cb,
	250	int flags)
4d12b8b1 LRV	251	{
	252	void *hdr;
	253
4d12b8b1	254	hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
0a40acb2	255	NFC_CMD_GET_DEVICE);
4d12b8b1 LRV	256	if (!hdr)
	257	return -EMSGSIZE;
	258
	259	if (cb)
	260	genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
	261
	262	NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
	263	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	264	NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
c970a1ac	265	NLA_PUT_U8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up);
4d12b8b1 LRV	266
	267	return genlmsg_end(msg, hdr);
	268
	269	nla_put_failure:
	270	genlmsg_cancel(msg, hdr);
	271	return -EMSGSIZE;
	272	}
	273
	274	static int nfc_genl_dump_devices(struct sk_buff *skb,
0a40acb2	275	struct netlink_callback *cb)
4d12b8b1 LRV	276	{
	277	struct class_dev_iter iter = (struct class_dev_iter ) cb->args[0];
	278	struct nfc_dev dev = (struct nfc_dev ) cb->args[1];
	279	bool first_call = false;
	280
4d12b8b1 LRV	281	if (!iter) {
	282	first_call = true;
	283	iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
	284	if (!iter)
	285	return -ENOMEM;
	286	cb->args[0] = (long) iter;
	287	}
	288
	289	mutex_lock(&nfc_devlist_mutex);
	290
	291	cb->seq = nfc_devlist_generation;
	292
	293	if (first_call) {
	294	nfc_device_iter_init(iter);
	295	dev = nfc_device_iter_next(iter);
	296	}
	297
	298	while (dev) {
	299	int rc;
	300
	301	rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
0a40acb2	302	cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
4d12b8b1 LRV	303	if (rc < 0)
	304	break;
	305
	306	dev = nfc_device_iter_next(iter);
	307	}
	308
	309	mutex_unlock(&nfc_devlist_mutex);
	310
	311	cb->args[1] = (long) dev;
	312
	313	return skb->len;
	314	}
	315
	316	static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
	317	{
	318	struct class_dev_iter iter = (struct class_dev_iter ) cb->args[0];
	319
4d12b8b1 LRV	320	nfc_device_iter_exit(iter);
	321	kfree(iter);
	322
	323	return 0;
	324	}
	325
1ed28f61	326	int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
0a40acb2	327	u8 comm_mode, u8 rf_mode)
1ed28f61 SO	328	{
	329	struct sk_buff *msg;
	330	void *hdr;
	331
	332	pr_debug("DEP link is up\n");
	333
	334	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	335	if (!msg)
	336	return -ENOMEM;
	337
0a40acb2	338	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
1ed28f61 SO	339	if (!hdr)
	340	goto free_msg;
	341
	342	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	343	if (rf_mode == NFC_RF_INITIATOR)
	344	NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target_idx);
	345	NLA_PUT_U8(msg, NFC_ATTR_COMM_MODE, comm_mode);
	346	NLA_PUT_U8(msg, NFC_ATTR_RF_MODE, rf_mode);
	347
	348	genlmsg_end(msg, hdr);
	349
	350	dev->dep_link_up = true;
	351
	352	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
	353
	354	return 0;
	355
	356	nla_put_failure:
	357	genlmsg_cancel(msg, hdr);
	358	free_msg:
	359	nlmsg_free(msg);
	360	return -EMSGSIZE;
	361	}
	362
	363	int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
	364	{
	365	struct sk_buff *msg;
	366	void *hdr;
	367
	368	pr_debug("DEP link is down\n");
	369
	370	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	371	if (!msg)
	372	return -ENOMEM;
	373
	374	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2	375	NFC_CMD_DEP_LINK_DOWN);
1ed28f61 SO	376	if (!hdr)
	377	goto free_msg;
	378
	379	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	380
	381	genlmsg_end(msg, hdr);
	382
	383	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
	384
	385	return 0;
	386
	387	nla_put_failure:
	388	genlmsg_cancel(msg, hdr);
	389	free_msg:
	390	nlmsg_free(msg);
	391	return -EMSGSIZE;
	392	}
	393
4d12b8b1 LRV	394	static int nfc_genl_get_device(struct sk_buff skb, struct genl_info info)
	395	{
	396	struct sk_buff *msg;
	397	struct nfc_dev *dev;
	398	u32 idx;
	399	int rc = -ENOBUFS;
	400
4d12b8b1 LRV	401	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	402	return -EINVAL;
	403
	404	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	405
	406	dev = nfc_get_device(idx);
	407	if (!dev)
	408	return -ENODEV;
	409
	410	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	411	if (!msg) {
	412	rc = -ENOMEM;
	413	goto out_putdev;
	414	}
	415
	416	rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
0a40acb2	417	NULL, 0);
4d12b8b1 LRV	418	if (rc < 0)
	419	goto out_free;
	420
	421	nfc_put_device(dev);
	422
	423	return genlmsg_reply(msg, info);
	424
	425	out_free:
	426	nlmsg_free(msg);
	427	out_putdev:
	428	nfc_put_device(dev);
	429	return rc;
	430	}
	431
8b3fe7b5 IE	432	static int nfc_genl_dev_up(struct sk_buff skb, struct genl_info info)
	433	{
	434	struct nfc_dev *dev;
	435	int rc;
	436	u32 idx;
	437
8b3fe7b5 IE	438	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	439	return -EINVAL;
	440
	441	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	442
	443	dev = nfc_get_device(idx);
	444	if (!dev)
	445	return -ENODEV;
	446
	447	rc = nfc_dev_up(dev);
	448
	449	nfc_put_device(dev);
	450	return rc;
	451	}
	452
	453	static int nfc_genl_dev_down(struct sk_buff skb, struct genl_info info)
	454	{
	455	struct nfc_dev *dev;
	456	int rc;
	457	u32 idx;
	458
8b3fe7b5 IE	459	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	460	return -EINVAL;
	461
	462	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	463
	464	dev = nfc_get_device(idx);
	465	if (!dev)
	466	return -ENODEV;
	467
	468	rc = nfc_dev_down(dev);
	469
	470	nfc_put_device(dev);
	471	return rc;
	472	}
	473
4d12b8b1 LRV	474	static int nfc_genl_start_poll(struct sk_buff skb, struct genl_info info)
	475	{
	476	struct nfc_dev *dev;
	477	int rc;
	478	u32 idx;
	479	u32 protocols;
	480
1ed28f61 SO	481	pr_debug("Poll start\n");
1ed28f61 SO	482
4d12b8b1	483	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] \|\|
0a40acb2	484	!info->attrs[NFC_ATTR_PROTOCOLS])
4d12b8b1 LRV	485	return -EINVAL;
	486
	487	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	488	protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
	489
	490	dev = nfc_get_device(idx);
	491	if (!dev)
	492	return -ENODEV;
	493
	494	mutex_lock(&dev->genl_data.genl_data_mutex);
	495
	496	rc = nfc_start_poll(dev, protocols);
	497	if (!rc)
	498	dev->genl_data.poll_req_pid = info->snd_pid;
	499
	500	mutex_unlock(&dev->genl_data.genl_data_mutex);
	501
	502	nfc_put_device(dev);
	503	return rc;
	504	}
	505
	506	static int nfc_genl_stop_poll(struct sk_buff skb, struct genl_info info)
	507	{
	508	struct nfc_dev *dev;
	509	int rc;
	510	u32 idx;
	511
4d12b8b1 LRV	512	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	513	return -EINVAL;
	514
	515	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	516
	517	dev = nfc_get_device(idx);
	518	if (!dev)
	519	return -ENODEV;
	520
	521	mutex_lock(&dev->genl_data.genl_data_mutex);
	522
	523	if (dev->genl_data.poll_req_pid != info->snd_pid) {
	524	rc = -EBUSY;
	525	goto out;
	526	}
	527
	528	rc = nfc_stop_poll(dev);
	529	dev->genl_data.poll_req_pid = 0;
	530
	531	out:
	532	mutex_unlock(&dev->genl_data.genl_data_mutex);
	533	nfc_put_device(dev);
	534	return rc;
	535	}
	536
1ed28f61 SO	537	static int nfc_genl_dep_link_up(struct sk_buff skb, struct genl_info info)
	538	{
	539	struct nfc_dev *dev;
	540	int rc, tgt_idx;
	541	u32 idx;
47807d3d	542	u8 comm;
1ed28f61 SO	543
	544	pr_debug("DEP link up\n");
	545
	546	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] \|\|
47807d3d	547	!info->attrs[NFC_ATTR_COMM_MODE])
1ed28f61 SO	548	return -EINVAL;
	549
	550	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	551	if (!info->attrs[NFC_ATTR_TARGET_INDEX])
	552	tgt_idx = NFC_TARGET_IDX_ANY;
	553	else
	554	tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
	555
	556	comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
1ed28f61 SO	557
	558	if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
	559	return -EINVAL;
	560
1ed28f61 SO	561	dev = nfc_get_device(idx);
	562	if (!dev)
	563	return -ENODEV;
	564
47807d3d	565	rc = nfc_dep_link_up(dev, tgt_idx, comm);
1ed28f61 SO	566
	567	nfc_put_device(dev);
	568
	569	return rc;
	570	}
	571
	572	static int nfc_genl_dep_link_down(struct sk_buff skb, struct genl_info info)
	573	{
	574	struct nfc_dev *dev;
	575	int rc;
	576	u32 idx;
	577
	578	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	579	return -EINVAL;
	580
	581	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	582
	583	dev = nfc_get_device(idx);
	584	if (!dev)
	585	return -ENODEV;
	586
	587	rc = nfc_dep_link_down(dev);
	588
	589	nfc_put_device(dev);
	590	return rc;
	591	}
	592
4d12b8b1 LRV	593	static struct genl_ops nfc_genl_ops[] = {
	594	{
	595	.cmd = NFC_CMD_GET_DEVICE,
	596	.doit = nfc_genl_get_device,
	597	.dumpit = nfc_genl_dump_devices,
	598	.done = nfc_genl_dump_devices_done,
	599	.policy = nfc_genl_policy,
8b3fe7b5 IE	600	},
	601	{
	602	.cmd = NFC_CMD_DEV_UP,
	603	.doit = nfc_genl_dev_up,
	604	.policy = nfc_genl_policy,
	605	},
	606	{
	607	.cmd = NFC_CMD_DEV_DOWN,
	608	.doit = nfc_genl_dev_down,
	609	.policy = nfc_genl_policy,
4d12b8b1 LRV	610	},
	611	{
	612	.cmd = NFC_CMD_START_POLL,
	613	.doit = nfc_genl_start_poll,
	614	.policy = nfc_genl_policy,
	615	},
	616	{
	617	.cmd = NFC_CMD_STOP_POLL,
	618	.doit = nfc_genl_stop_poll,
	619	.policy = nfc_genl_policy,
	620	},
1ed28f61 SO	621	{
	622	.cmd = NFC_CMD_DEP_LINK_UP,
	623	.doit = nfc_genl_dep_link_up,
	624	.policy = nfc_genl_policy,
	625	},
	626	{
	627	.cmd = NFC_CMD_DEP_LINK_DOWN,
	628	.doit = nfc_genl_dep_link_down,
	629	.policy = nfc_genl_policy,
	630	},
4d12b8b1 LRV	631	{
	632	.cmd = NFC_CMD_GET_TARGET,
	633	.dumpit = nfc_genl_dump_targets,
	634	.done = nfc_genl_dump_targets_done,
	635	.policy = nfc_genl_policy,
	636	},
	637	};
	638
	639	static int nfc_genl_rcv_nl_event(struct notifier_block *this,
0a40acb2	640	unsigned long event, void *ptr)
4d12b8b1 LRV	641	{
	642	struct netlink_notify *n = ptr;
	643	struct class_dev_iter iter;
	644	struct nfc_dev *dev;
	645
	646	if (event != NETLINK_URELEASE \|\| n->protocol != NETLINK_GENERIC)
	647	goto out;
	648
20c239c1	649	pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
4d12b8b1 LRV	650
	651	nfc_device_iter_init(&iter);
	652	dev = nfc_device_iter_next(&iter);
	653
	654	while (dev) {
4d12b8b1 LRV	655	if (dev->genl_data.poll_req_pid == n->pid) {
	656	nfc_stop_poll(dev);
	657	dev->genl_data.poll_req_pid = 0;
	658	}
4d12b8b1 LRV	659	dev = nfc_device_iter_next(&iter);
	660	}
	661
	662	nfc_device_iter_exit(&iter);
	663
	664	out:
	665	return NOTIFY_DONE;
	666	}
	667
	668	void nfc_genl_data_init(struct nfc_genl_data *genl_data)
	669	{
	670	genl_data->poll_req_pid = 0;
	671	mutex_init(&genl_data->genl_data_mutex);
	672	}
	673
	674	void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
	675	{
	676	mutex_destroy(&genl_data->genl_data_mutex);
	677	}
	678
	679	static struct notifier_block nl_notifier = {
	680	.notifier_call = nfc_genl_rcv_nl_event,
	681	};
	682
	683	/**
	684	* nfc_genl_init() - Initialize netlink interface
	685	*
	686	* This initialization function registers the nfc netlink family.
	687	*/
	688	int __init nfc_genl_init(void)
	689	{
	690	int rc;
	691
	692	rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
0a40acb2	693	ARRAY_SIZE(nfc_genl_ops));
4d12b8b1 LRV	694	if (rc)
	695	return rc;
	696
	697	rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
	698
	699	netlink_register_notifier(&nl_notifier);
	700
	701	return rc;
	702	}
	703
	704	/**
	705	* nfc_genl_exit() - Deinitialize netlink interface
	706	*
	707	* This exit function unregisters the nfc netlink family.
	708	*/
	709	void nfc_genl_exit(void)
	710	{
	711	netlink_unregister_notifier(&nl_notifier);
	712	genl_unregister_family(&nfc_genl_family);
	713	}