[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);

	if (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))
		goto nla_put_failure;
	if (target->nfcid1_len > 0 &&
	    nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
		    target->nfcid1))
		goto nla_put_failure;
	if (target->sensb_res_len > 0 &&
	    nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
		    target->sensb_res))
		goto nla_put_failure;
	if (target->sensf_res_len > 0 &&
	    nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
		    target->sensf_res))
		goto nla_put_failure;

	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;

	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
		goto nla_put_failure;

	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;

	if (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))
		goto nla_put_failure;

	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;

	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
		goto nla_put_failure;

	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);

	if (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))
		goto nla_put_failure;

	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;

	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
		goto nla_put_failure;
	if (rf_mode == NFC_RF_INITIATOR &&
	    nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
		goto nla_put_failure;
	if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
	    nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
		goto nla_put_failure;

	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;

	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
		goto nla_put_failure;

	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
1e6428d8 DM	66	if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) \|\|
	67	nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) \|\|
	68	nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) \|\|
	69	nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
	70	goto nla_put_failure;
	71	if (target->nfcid1_len > 0 &&
	72	nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
	73	target->nfcid1))
	74	goto nla_put_failure;
	75	if (target->sensb_res_len > 0 &&
	76	nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
	77	target->sensb_res))
	78	goto nla_put_failure;
	79	if (target->sensf_res_len > 0 &&
	80	nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
	81	target->sensf_res))
	82	goto nla_put_failure;
4d12b8b1 LRV	83
	84	return genlmsg_end(msg, hdr);
	85
	86	nla_put_failure:
	87	genlmsg_cancel(msg, hdr);
	88	return -EMSGSIZE;
	89	}
	90
	91	static struct nfc_dev __get_device_from_cb(struct netlink_callback cb)
	92	{
	93	struct nfc_dev *dev;
	94	int rc;
	95	u32 idx;
	96
	97	rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
0a40acb2 SO	98	nfc_genl_family.attrbuf,
	99	nfc_genl_family.maxattr,
	100	nfc_genl_policy);
4d12b8b1 LRV	101	if (rc < 0)
	102	return ERR_PTR(rc);
	103
	104	if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
	105	return ERR_PTR(-EINVAL);
	106
	107	idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
	108
	109	dev = nfc_get_device(idx);
	110	if (!dev)
	111	return ERR_PTR(-ENODEV);
	112
	113	return dev;
	114	}
	115
	116	static int nfc_genl_dump_targets(struct sk_buff *skb,
0a40acb2	117	struct netlink_callback *cb)
4d12b8b1 LRV	118	{
	119	int i = cb->args[0];
	120	struct nfc_dev dev = (struct nfc_dev ) cb->args[1];
	121	int rc;
	122
4d12b8b1 LRV	123	if (!dev) {
	124	dev = __get_device_from_cb(cb);
	125	if (IS_ERR(dev))
	126	return PTR_ERR(dev);
	127
	128	cb->args[1] = (long) dev;
	129	}
	130
	131	spin_lock_bh(&dev->targets_lock);
	132
	133	cb->seq = dev->targets_generation;
	134
	135	while (i < dev->n_targets) {
	136	rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
0a40acb2	137	NLM_F_MULTI);
4d12b8b1 LRV	138	if (rc < 0)
	139	break;
	140
	141	i++;
	142	}
	143
	144	spin_unlock_bh(&dev->targets_lock);
	145
	146	cb->args[0] = i;
	147
	148	return skb->len;
	149	}
	150
	151	static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
	152	{
	153	struct nfc_dev dev = (struct nfc_dev ) cb->args[1];
	154
4d12b8b1 LRV	155	if (dev)
	156	nfc_put_device(dev);
	157
	158	return 0;
	159	}
	160
	161	int nfc_genl_targets_found(struct nfc_dev *dev)
	162	{
	163	struct sk_buff *msg;
	164	void *hdr;
	165
4d12b8b1 LRV	166	dev->genl_data.poll_req_pid = 0;
	167
	168	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	169	if (!msg)
	170	return -ENOMEM;
	171
	172	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2	173	NFC_EVENT_TARGETS_FOUND);
4d12b8b1 LRV	174	if (!hdr)
	175	goto free_msg;
	176
1e6428d8 DM	177	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1e6428d8 DM	178	goto nla_put_failure;
4d12b8b1 LRV	179
	180	genlmsg_end(msg, hdr);
	181
	182	return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
	183
	184	nla_put_failure:
	185	genlmsg_cancel(msg, hdr);
	186	free_msg:
	187	nlmsg_free(msg);
	188	return -EMSGSIZE;
	189	}
	190
	191	int nfc_genl_device_added(struct nfc_dev *dev)
	192	{
	193	struct sk_buff *msg;
	194	void *hdr;
	195
4d12b8b1 LRV	196	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	197	if (!msg)
	198	return -ENOMEM;
	199
	200	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2	201	NFC_EVENT_DEVICE_ADDED);
4d12b8b1 LRV	202	if (!hdr)
	203	goto free_msg;
	204
1e6428d8 DM	205	if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) \|\|
	206	nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) \|\|
	207	nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) \|\|
	208	nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
	209	goto nla_put_failure;
4d12b8b1 LRV	210
	211	genlmsg_end(msg, hdr);
	212
	213	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
	214
	215	return 0;
	216
	217	nla_put_failure:
	218	genlmsg_cancel(msg, hdr);
	219	free_msg:
	220	nlmsg_free(msg);
	221	return -EMSGSIZE;
	222	}
	223
	224	int nfc_genl_device_removed(struct nfc_dev *dev)
	225	{
	226	struct sk_buff *msg;
	227	void *hdr;
	228
4d12b8b1 LRV	229	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	230	if (!msg)
	231	return -ENOMEM;
	232
	233	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2	234	NFC_EVENT_DEVICE_REMOVED);
4d12b8b1 LRV	235	if (!hdr)
	236	goto free_msg;
	237
1e6428d8 DM	238	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1e6428d8 DM	239	goto nla_put_failure;
4d12b8b1 LRV	240
	241	genlmsg_end(msg, hdr);
	242
	243	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
	244
	245	return 0;
	246
	247	nla_put_failure:
	248	genlmsg_cancel(msg, hdr);
	249	free_msg:
	250	nlmsg_free(msg);
	251	return -EMSGSIZE;
	252	}
	253
	254	static int nfc_genl_send_device(struct sk_buff msg, struct nfc_dev dev,
0a40acb2 SO	255	u32 pid, u32 seq,
	256	struct netlink_callback *cb,
	257	int flags)
4d12b8b1 LRV	258	{
	259	void *hdr;
	260
4d12b8b1	261	hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
0a40acb2	262	NFC_CMD_GET_DEVICE);
4d12b8b1 LRV	263	if (!hdr)
	264	return -EMSGSIZE;
	265
	266	if (cb)
	267	genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
	268
1e6428d8 DM	269	if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) \|\|
	270	nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) \|\|
	271	nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) \|\|
	272	nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
	273	goto nla_put_failure;
4d12b8b1 LRV	274
	275	return genlmsg_end(msg, hdr);
	276
	277	nla_put_failure:
	278	genlmsg_cancel(msg, hdr);
	279	return -EMSGSIZE;
	280	}
	281
	282	static int nfc_genl_dump_devices(struct sk_buff *skb,
0a40acb2	283	struct netlink_callback *cb)
4d12b8b1 LRV	284	{
	285	struct class_dev_iter iter = (struct class_dev_iter ) cb->args[0];
	286	struct nfc_dev dev = (struct nfc_dev ) cb->args[1];
	287	bool first_call = false;
	288
4d12b8b1 LRV	289	if (!iter) {
	290	first_call = true;
	291	iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
	292	if (!iter)
	293	return -ENOMEM;
	294	cb->args[0] = (long) iter;
	295	}
	296
	297	mutex_lock(&nfc_devlist_mutex);
	298
	299	cb->seq = nfc_devlist_generation;
	300
	301	if (first_call) {
	302	nfc_device_iter_init(iter);
	303	dev = nfc_device_iter_next(iter);
	304	}
	305
	306	while (dev) {
	307	int rc;
	308
	309	rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
0a40acb2	310	cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
4d12b8b1 LRV	311	if (rc < 0)
	312	break;
	313
	314	dev = nfc_device_iter_next(iter);
	315	}
	316
	317	mutex_unlock(&nfc_devlist_mutex);
	318
	319	cb->args[1] = (long) dev;
	320
	321	return skb->len;
	322	}
	323
	324	static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
	325	{
	326	struct class_dev_iter iter = (struct class_dev_iter ) cb->args[0];
	327
4d12b8b1 LRV	328	nfc_device_iter_exit(iter);
	329	kfree(iter);
	330
	331	return 0;
	332	}
	333
1ed28f61	334	int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
0a40acb2	335	u8 comm_mode, u8 rf_mode)
1ed28f61 SO	336	{
	337	struct sk_buff *msg;
	338	void *hdr;
	339
	340	pr_debug("DEP link is up\n");
	341
	342	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	343	if (!msg)
	344	return -ENOMEM;
	345
0a40acb2	346	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
1ed28f61 SO	347	if (!hdr)
	348	goto free_msg;
	349
1e6428d8 DM	350	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
	351	goto nla_put_failure;
	352	if (rf_mode == NFC_RF_INITIATOR &&
	353	nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
	354	goto nla_put_failure;
	355	if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) \|\|
	356	nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
	357	goto nla_put_failure;
1ed28f61 SO	358
	359	genlmsg_end(msg, hdr);
	360
	361	dev->dep_link_up = true;
	362
	363	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
	364
	365	return 0;
	366
	367	nla_put_failure:
	368	genlmsg_cancel(msg, hdr);
	369	free_msg:
	370	nlmsg_free(msg);
	371	return -EMSGSIZE;
	372	}
	373
	374	int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
	375	{
	376	struct sk_buff *msg;
	377	void *hdr;
	378
	379	pr_debug("DEP link is down\n");
	380
	381	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	382	if (!msg)
	383	return -ENOMEM;
	384
	385	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2	386	NFC_CMD_DEP_LINK_DOWN);
1ed28f61 SO	387	if (!hdr)
	388	goto free_msg;
	389
1e6428d8 DM	390	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1e6428d8 DM	391	goto nla_put_failure;
1ed28f61 SO	392
	393	genlmsg_end(msg, hdr);
	394
	395	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
	396
	397	return 0;
	398
	399	nla_put_failure:
	400	genlmsg_cancel(msg, hdr);
	401	free_msg:
	402	nlmsg_free(msg);
	403	return -EMSGSIZE;
	404	}
	405
4d12b8b1 LRV	406	static int nfc_genl_get_device(struct sk_buff skb, struct genl_info info)
	407	{
	408	struct sk_buff *msg;
	409	struct nfc_dev *dev;
	410	u32 idx;
	411	int rc = -ENOBUFS;
	412
4d12b8b1 LRV	413	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	414	return -EINVAL;
	415
	416	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	417
	418	dev = nfc_get_device(idx);
	419	if (!dev)
	420	return -ENODEV;
	421
	422	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	423	if (!msg) {
	424	rc = -ENOMEM;
	425	goto out_putdev;
	426	}
	427
	428	rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
0a40acb2	429	NULL, 0);
4d12b8b1 LRV	430	if (rc < 0)
	431	goto out_free;
	432
	433	nfc_put_device(dev);
	434
	435	return genlmsg_reply(msg, info);
	436
	437	out_free:
	438	nlmsg_free(msg);
	439	out_putdev:
	440	nfc_put_device(dev);
	441	return rc;
	442	}
	443
8b3fe7b5 IE	444	static int nfc_genl_dev_up(struct sk_buff skb, struct genl_info info)
	445	{
	446	struct nfc_dev *dev;
	447	int rc;
	448	u32 idx;
	449
8b3fe7b5 IE	450	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	451	return -EINVAL;
	452
	453	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	454
	455	dev = nfc_get_device(idx);
	456	if (!dev)
	457	return -ENODEV;
	458
	459	rc = nfc_dev_up(dev);
	460
	461	nfc_put_device(dev);
	462	return rc;
	463	}
	464
	465	static int nfc_genl_dev_down(struct sk_buff skb, struct genl_info info)
	466	{
	467	struct nfc_dev *dev;
	468	int rc;
	469	u32 idx;
	470
8b3fe7b5 IE	471	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	472	return -EINVAL;
	473
	474	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	475
	476	dev = nfc_get_device(idx);
	477	if (!dev)
	478	return -ENODEV;
	479
	480	rc = nfc_dev_down(dev);
	481
	482	nfc_put_device(dev);
	483	return rc;
	484	}
	485
4d12b8b1 LRV	486	static int nfc_genl_start_poll(struct sk_buff skb, struct genl_info info)
	487	{
	488	struct nfc_dev *dev;
	489	int rc;
	490	u32 idx;
	491	u32 protocols;
	492
1ed28f61 SO	493	pr_debug("Poll start\n");
1ed28f61 SO	494
4d12b8b1	495	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] \|\|
0a40acb2	496	!info->attrs[NFC_ATTR_PROTOCOLS])
4d12b8b1 LRV	497	return -EINVAL;
	498
	499	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	500	protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
	501
	502	dev = nfc_get_device(idx);
	503	if (!dev)
	504	return -ENODEV;
	505
	506	mutex_lock(&dev->genl_data.genl_data_mutex);
	507
	508	rc = nfc_start_poll(dev, protocols);
	509	if (!rc)
	510	dev->genl_data.poll_req_pid = info->snd_pid;
	511
	512	mutex_unlock(&dev->genl_data.genl_data_mutex);
	513
	514	nfc_put_device(dev);
	515	return rc;
	516	}
	517
	518	static int nfc_genl_stop_poll(struct sk_buff skb, struct genl_info info)
	519	{
	520	struct nfc_dev *dev;
	521	int rc;
	522	u32 idx;
	523
4d12b8b1 LRV	524	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	525	return -EINVAL;
	526
	527	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	528
	529	dev = nfc_get_device(idx);
	530	if (!dev)
	531	return -ENODEV;
	532
	533	mutex_lock(&dev->genl_data.genl_data_mutex);
	534
	535	if (dev->genl_data.poll_req_pid != info->snd_pid) {
	536	rc = -EBUSY;
	537	goto out;
	538	}
	539
	540	rc = nfc_stop_poll(dev);
	541	dev->genl_data.poll_req_pid = 0;
	542
	543	out:
	544	mutex_unlock(&dev->genl_data.genl_data_mutex);
	545	nfc_put_device(dev);
	546	return rc;
	547	}
	548
1ed28f61 SO	549	static int nfc_genl_dep_link_up(struct sk_buff skb, struct genl_info info)
	550	{
	551	struct nfc_dev *dev;
	552	int rc, tgt_idx;
	553	u32 idx;
47807d3d	554	u8 comm;
1ed28f61 SO	555
	556	pr_debug("DEP link up\n");
	557
	558	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] \|\|
47807d3d	559	!info->attrs[NFC_ATTR_COMM_MODE])
1ed28f61 SO	560	return -EINVAL;
	561
	562	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	563	if (!info->attrs[NFC_ATTR_TARGET_INDEX])
	564	tgt_idx = NFC_TARGET_IDX_ANY;
	565	else
	566	tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
	567
	568	comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
1ed28f61 SO	569
	570	if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
	571	return -EINVAL;
	572
1ed28f61 SO	573	dev = nfc_get_device(idx);
	574	if (!dev)
	575	return -ENODEV;
	576
47807d3d	577	rc = nfc_dep_link_up(dev, tgt_idx, comm);
1ed28f61 SO	578
	579	nfc_put_device(dev);
	580
	581	return rc;
	582	}
	583
	584	static int nfc_genl_dep_link_down(struct sk_buff skb, struct genl_info info)
	585	{
	586	struct nfc_dev *dev;
	587	int rc;
	588	u32 idx;
	589
	590	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	591	return -EINVAL;
	592
	593	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	594
	595	dev = nfc_get_device(idx);
	596	if (!dev)
	597	return -ENODEV;
	598
	599	rc = nfc_dep_link_down(dev);
	600
	601	nfc_put_device(dev);
	602	return rc;
	603	}
	604
4d12b8b1 LRV	605	static struct genl_ops nfc_genl_ops[] = {
	606	{
	607	.cmd = NFC_CMD_GET_DEVICE,
	608	.doit = nfc_genl_get_device,
	609	.dumpit = nfc_genl_dump_devices,
	610	.done = nfc_genl_dump_devices_done,
	611	.policy = nfc_genl_policy,
8b3fe7b5 IE	612	},
	613	{
	614	.cmd = NFC_CMD_DEV_UP,
	615	.doit = nfc_genl_dev_up,
	616	.policy = nfc_genl_policy,
	617	},
	618	{
	619	.cmd = NFC_CMD_DEV_DOWN,
	620	.doit = nfc_genl_dev_down,
	621	.policy = nfc_genl_policy,
4d12b8b1 LRV	622	},
	623	{
	624	.cmd = NFC_CMD_START_POLL,
	625	.doit = nfc_genl_start_poll,
	626	.policy = nfc_genl_policy,
	627	},
	628	{
	629	.cmd = NFC_CMD_STOP_POLL,
	630	.doit = nfc_genl_stop_poll,
	631	.policy = nfc_genl_policy,
	632	},
1ed28f61 SO	633	{
	634	.cmd = NFC_CMD_DEP_LINK_UP,
	635	.doit = nfc_genl_dep_link_up,
	636	.policy = nfc_genl_policy,
	637	},
	638	{
	639	.cmd = NFC_CMD_DEP_LINK_DOWN,
	640	.doit = nfc_genl_dep_link_down,
	641	.policy = nfc_genl_policy,
	642	},
4d12b8b1 LRV	643	{
	644	.cmd = NFC_CMD_GET_TARGET,
	645	.dumpit = nfc_genl_dump_targets,
	646	.done = nfc_genl_dump_targets_done,
	647	.policy = nfc_genl_policy,
	648	},
	649	};
	650
	651	static int nfc_genl_rcv_nl_event(struct notifier_block *this,
0a40acb2	652	unsigned long event, void *ptr)
4d12b8b1 LRV	653	{
	654	struct netlink_notify *n = ptr;
	655	struct class_dev_iter iter;
	656	struct nfc_dev *dev;
	657
	658	if (event != NETLINK_URELEASE \|\| n->protocol != NETLINK_GENERIC)
	659	goto out;
	660
20c239c1	661	pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
4d12b8b1 LRV	662
	663	nfc_device_iter_init(&iter);
	664	dev = nfc_device_iter_next(&iter);
	665
	666	while (dev) {
4d12b8b1 LRV	667	if (dev->genl_data.poll_req_pid == n->pid) {
	668	nfc_stop_poll(dev);
	669	dev->genl_data.poll_req_pid = 0;
	670	}
4d12b8b1 LRV	671	dev = nfc_device_iter_next(&iter);
	672	}
	673
	674	nfc_device_iter_exit(&iter);
	675
	676	out:
	677	return NOTIFY_DONE;
	678	}
	679
	680	void nfc_genl_data_init(struct nfc_genl_data *genl_data)
	681	{
	682	genl_data->poll_req_pid = 0;
	683	mutex_init(&genl_data->genl_data_mutex);
	684	}
	685
	686	void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
	687	{
	688	mutex_destroy(&genl_data->genl_data_mutex);
	689	}
	690
	691	static struct notifier_block nl_notifier = {
	692	.notifier_call = nfc_genl_rcv_nl_event,
	693	};
	694
	695	/**
	696	* nfc_genl_init() - Initialize netlink interface
	697	*
	698	* This initialization function registers the nfc netlink family.
	699	*/
	700	int __init nfc_genl_init(void)
	701	{
	702	int rc;
	703
	704	rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
0a40acb2	705	ARRAY_SIZE(nfc_genl_ops));
4d12b8b1 LRV	706	if (rc)
	707	return rc;
	708
	709	rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
	710
	711	netlink_register_notifier(&nl_notifier);
	712
	713	return rc;
	714	}
	715
	716	/**
	717	* nfc_genl_exit() - Deinitialize netlink interface
	718	*
	719	* This exit function unregisters the nfc netlink family.
	720	*/
	721	void nfc_genl_exit(void)
	722	{
	723	netlink_unregister_notifier(&nl_notifier);
	724	genl_unregister_family(&nfc_genl_family);
	725	}