[GitHub/mt8127/android_kernel_alcatel_ttab.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 },
};

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);

	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);

	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);

	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;
}

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;

	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 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_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 },
	49	};
	50
	51	static int nfc_genl_send_target(struct sk_buff msg, struct nfc_target target,
	52	struct netlink_callback *cb, int flags)
	53	{
	54	void *hdr;
	55
4d12b8b1 LRV	56	hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
	57	&nfc_genl_family, flags, NFC_CMD_GET_TARGET);
	58	if (!hdr)
	59	return -EMSGSIZE;
	60
	61	genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
	62
	63	NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target->idx);
	64	NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS,
	65	target->supported_protocols);
	66	NLA_PUT_U16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res);
	67	NLA_PUT_U8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res);
	68
	69	return genlmsg_end(msg, hdr);
	70
	71	nla_put_failure:
	72	genlmsg_cancel(msg, hdr);
	73	return -EMSGSIZE;
	74	}
	75
	76	static struct nfc_dev __get_device_from_cb(struct netlink_callback cb)
	77	{
	78	struct nfc_dev *dev;
	79	int rc;
	80	u32 idx;
	81
	82	rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
	83	nfc_genl_family.attrbuf,
	84	nfc_genl_family.maxattr,
	85	nfc_genl_policy);
	86	if (rc < 0)
	87	return ERR_PTR(rc);
	88
	89	if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
	90	return ERR_PTR(-EINVAL);
	91
	92	idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
	93
	94	dev = nfc_get_device(idx);
	95	if (!dev)
	96	return ERR_PTR(-ENODEV);
	97
	98	return dev;
	99	}
	100
	101	static int nfc_genl_dump_targets(struct sk_buff *skb,
	102	struct netlink_callback *cb)
	103	{
	104	int i = cb->args[0];
	105	struct nfc_dev dev = (struct nfc_dev ) cb->args[1];
	106	int rc;
	107
4d12b8b1 LRV	108	if (!dev) {
	109	dev = __get_device_from_cb(cb);
	110	if (IS_ERR(dev))
	111	return PTR_ERR(dev);
	112
	113	cb->args[1] = (long) dev;
	114	}
	115
	116	spin_lock_bh(&dev->targets_lock);
	117
	118	cb->seq = dev->targets_generation;
	119
	120	while (i < dev->n_targets) {
	121	rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
	122	NLM_F_MULTI);
	123	if (rc < 0)
	124	break;
	125
	126	i++;
	127	}
	128
	129	spin_unlock_bh(&dev->targets_lock);
	130
	131	cb->args[0] = i;
	132
	133	return skb->len;
	134	}
	135
	136	static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
	137	{
	138	struct nfc_dev dev = (struct nfc_dev ) cb->args[1];
	139
4d12b8b1 LRV	140	if (dev)
	141	nfc_put_device(dev);
	142
	143	return 0;
	144	}
	145
	146	int nfc_genl_targets_found(struct nfc_dev *dev)
	147	{
	148	struct sk_buff *msg;
	149	void *hdr;
	150
4d12b8b1 LRV	151	dev->genl_data.poll_req_pid = 0;
	152
	153	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	154	if (!msg)
	155	return -ENOMEM;
	156
	157	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
	158	NFC_EVENT_TARGETS_FOUND);
	159	if (!hdr)
	160	goto free_msg;
	161
	162	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	163
	164	genlmsg_end(msg, hdr);
	165
	166	return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
	167
	168	nla_put_failure:
	169	genlmsg_cancel(msg, hdr);
	170	free_msg:
	171	nlmsg_free(msg);
	172	return -EMSGSIZE;
	173	}
	174
	175	int nfc_genl_device_added(struct nfc_dev *dev)
	176	{
	177	struct sk_buff *msg;
	178	void *hdr;
	179
4d12b8b1 LRV	180	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	181	if (!msg)
	182	return -ENOMEM;
	183
	184	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
	185	NFC_EVENT_DEVICE_ADDED);
	186	if (!hdr)
	187	goto free_msg;
	188
	189	NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
	190	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	191	NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
	192
	193	genlmsg_end(msg, hdr);
	194
	195	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
	196
	197	return 0;
	198
	199	nla_put_failure:
	200	genlmsg_cancel(msg, hdr);
	201	free_msg:
	202	nlmsg_free(msg);
	203	return -EMSGSIZE;
	204	}
	205
	206	int nfc_genl_device_removed(struct nfc_dev *dev)
	207	{
	208	struct sk_buff *msg;
	209	void *hdr;
	210
4d12b8b1 LRV	211	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	212	if (!msg)
	213	return -ENOMEM;
	214
	215	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
	216	NFC_EVENT_DEVICE_REMOVED);
	217	if (!hdr)
	218	goto free_msg;
	219
	220	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	221
	222	genlmsg_end(msg, hdr);
	223
	224	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
	225
	226	return 0;
	227
	228	nla_put_failure:
	229	genlmsg_cancel(msg, hdr);
	230	free_msg:
	231	nlmsg_free(msg);
	232	return -EMSGSIZE;
	233	}
	234
	235	static int nfc_genl_send_device(struct sk_buff msg, struct nfc_dev dev,
	236	u32 pid, u32 seq,
	237	struct netlink_callback *cb,
	238	int flags)
	239	{
	240	void *hdr;
	241
4d12b8b1 LRV	242	hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
	243	NFC_CMD_GET_DEVICE);
	244	if (!hdr)
	245	return -EMSGSIZE;
	246
	247	if (cb)
	248	genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
	249
	250	NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
	251	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	252	NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
	253
	254	return genlmsg_end(msg, hdr);
	255
	256	nla_put_failure:
	257	genlmsg_cancel(msg, hdr);
	258	return -EMSGSIZE;
	259	}
	260
	261	static int nfc_genl_dump_devices(struct sk_buff *skb,
	262	struct netlink_callback *cb)
	263	{
	264	struct class_dev_iter iter = (struct class_dev_iter ) cb->args[0];
	265	struct nfc_dev dev = (struct nfc_dev ) cb->args[1];
	266	bool first_call = false;
	267
4d12b8b1 LRV	268	if (!iter) {
	269	first_call = true;
	270	iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
	271	if (!iter)
	272	return -ENOMEM;
	273	cb->args[0] = (long) iter;
	274	}
	275
	276	mutex_lock(&nfc_devlist_mutex);
	277
	278	cb->seq = nfc_devlist_generation;
	279
	280	if (first_call) {
	281	nfc_device_iter_init(iter);
	282	dev = nfc_device_iter_next(iter);
	283	}
	284
	285	while (dev) {
	286	int rc;
	287
	288	rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
	289	cb->nlh->nlmsg_seq,
	290	cb, NLM_F_MULTI);
	291	if (rc < 0)
	292	break;
	293
	294	dev = nfc_device_iter_next(iter);
	295	}
	296
	297	mutex_unlock(&nfc_devlist_mutex);
	298
	299	cb->args[1] = (long) dev;
	300
	301	return skb->len;
	302	}
	303
	304	static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
	305	{
	306	struct class_dev_iter iter = (struct class_dev_iter ) cb->args[0];
	307
4d12b8b1 LRV	308	nfc_device_iter_exit(iter);
	309	kfree(iter);
	310
	311	return 0;
	312	}
	313
	314	static int nfc_genl_get_device(struct sk_buff skb, struct genl_info info)
	315	{
	316	struct sk_buff *msg;
	317	struct nfc_dev *dev;
	318	u32 idx;
	319	int rc = -ENOBUFS;
	320
4d12b8b1 LRV	321	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	322	return -EINVAL;
	323
	324	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	325
	326	dev = nfc_get_device(idx);
	327	if (!dev)
	328	return -ENODEV;
	329
	330	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	331	if (!msg) {
	332	rc = -ENOMEM;
	333	goto out_putdev;
	334	}
	335
	336	rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
	337	NULL, 0);
	338	if (rc < 0)
	339	goto out_free;
	340
	341	nfc_put_device(dev);
	342
	343	return genlmsg_reply(msg, info);
	344
	345	out_free:
	346	nlmsg_free(msg);
	347	out_putdev:
	348	nfc_put_device(dev);
	349	return rc;
	350	}
	351
8b3fe7b5 IE	352	static int nfc_genl_dev_up(struct sk_buff skb, struct genl_info info)
	353	{
	354	struct nfc_dev *dev;
	355	int rc;
	356	u32 idx;
	357
8b3fe7b5 IE	358	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	359	return -EINVAL;
	360
	361	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	362
	363	dev = nfc_get_device(idx);
	364	if (!dev)
	365	return -ENODEV;
	366
	367	rc = nfc_dev_up(dev);
	368
	369	nfc_put_device(dev);
	370	return rc;
	371	}
	372
	373	static int nfc_genl_dev_down(struct sk_buff skb, struct genl_info info)
	374	{
	375	struct nfc_dev *dev;
	376	int rc;
	377	u32 idx;
	378
8b3fe7b5 IE	379	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	380	return -EINVAL;
	381
	382	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	383
	384	dev = nfc_get_device(idx);
	385	if (!dev)
	386	return -ENODEV;
	387
	388	rc = nfc_dev_down(dev);
	389
	390	nfc_put_device(dev);
	391	return rc;
	392	}
	393
4d12b8b1 LRV	394	static int nfc_genl_start_poll(struct sk_buff skb, struct genl_info info)
	395	{
	396	struct nfc_dev *dev;
	397	int rc;
	398	u32 idx;
	399	u32 protocols;
	400
4d12b8b1 LRV	401	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] \|\|
	402	!info->attrs[NFC_ATTR_PROTOCOLS])
	403	return -EINVAL;
	404
	405	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	406	protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
	407
	408	dev = nfc_get_device(idx);
	409	if (!dev)
	410	return -ENODEV;
	411
	412	mutex_lock(&dev->genl_data.genl_data_mutex);
	413
	414	rc = nfc_start_poll(dev, protocols);
	415	if (!rc)
	416	dev->genl_data.poll_req_pid = info->snd_pid;
	417
	418	mutex_unlock(&dev->genl_data.genl_data_mutex);
	419
	420	nfc_put_device(dev);
	421	return rc;
	422	}
	423
	424	static int nfc_genl_stop_poll(struct sk_buff skb, struct genl_info info)
	425	{
	426	struct nfc_dev *dev;
	427	int rc;
	428	u32 idx;
	429
4d12b8b1 LRV	430	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
	431	return -EINVAL;
	432
	433	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	434
	435	dev = nfc_get_device(idx);
	436	if (!dev)
	437	return -ENODEV;
	438
	439	mutex_lock(&dev->genl_data.genl_data_mutex);
	440
	441	if (dev->genl_data.poll_req_pid != info->snd_pid) {
	442	rc = -EBUSY;
	443	goto out;
	444	}
	445
	446	rc = nfc_stop_poll(dev);
	447	dev->genl_data.poll_req_pid = 0;
	448
	449	out:
	450	mutex_unlock(&dev->genl_data.genl_data_mutex);
	451	nfc_put_device(dev);
	452	return rc;
	453	}
	454
	455	static struct genl_ops nfc_genl_ops[] = {
	456	{
	457	.cmd = NFC_CMD_GET_DEVICE,
	458	.doit = nfc_genl_get_device,
	459	.dumpit = nfc_genl_dump_devices,
	460	.done = nfc_genl_dump_devices_done,
	461	.policy = nfc_genl_policy,
8b3fe7b5 IE	462	},
	463	{
	464	.cmd = NFC_CMD_DEV_UP,
	465	.doit = nfc_genl_dev_up,
	466	.policy = nfc_genl_policy,
	467	},
	468	{
	469	.cmd = NFC_CMD_DEV_DOWN,
	470	.doit = nfc_genl_dev_down,
	471	.policy = nfc_genl_policy,
4d12b8b1 LRV	472	},
	473	{
	474	.cmd = NFC_CMD_START_POLL,
	475	.doit = nfc_genl_start_poll,
	476	.policy = nfc_genl_policy,
	477	},
	478	{
	479	.cmd = NFC_CMD_STOP_POLL,
	480	.doit = nfc_genl_stop_poll,
	481	.policy = nfc_genl_policy,
	482	},
	483	{
	484	.cmd = NFC_CMD_GET_TARGET,
	485	.dumpit = nfc_genl_dump_targets,
	486	.done = nfc_genl_dump_targets_done,
	487	.policy = nfc_genl_policy,
	488	},
	489	};
	490
	491	static int nfc_genl_rcv_nl_event(struct notifier_block *this,
	492	unsigned long event, void *ptr)
	493	{
	494	struct netlink_notify *n = ptr;
	495	struct class_dev_iter iter;
	496	struct nfc_dev *dev;
	497
	498	if (event != NETLINK_URELEASE \|\| n->protocol != NETLINK_GENERIC)
	499	goto out;
	500
20c239c1	501	pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
4d12b8b1 LRV	502
	503	nfc_device_iter_init(&iter);
	504	dev = nfc_device_iter_next(&iter);
	505
	506	while (dev) {
4d12b8b1 LRV	507	if (dev->genl_data.poll_req_pid == n->pid) {
	508	nfc_stop_poll(dev);
	509	dev->genl_data.poll_req_pid = 0;
	510	}
4d12b8b1 LRV	511	dev = nfc_device_iter_next(&iter);
	512	}
	513
	514	nfc_device_iter_exit(&iter);
	515
	516	out:
	517	return NOTIFY_DONE;
	518	}
	519
	520	void nfc_genl_data_init(struct nfc_genl_data *genl_data)
	521	{
	522	genl_data->poll_req_pid = 0;
	523	mutex_init(&genl_data->genl_data_mutex);
	524	}
	525
	526	void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
	527	{
	528	mutex_destroy(&genl_data->genl_data_mutex);
	529	}
	530
	531	static struct notifier_block nl_notifier = {
	532	.notifier_call = nfc_genl_rcv_nl_event,
	533	};
	534
	535	/**
	536	* nfc_genl_init() - Initialize netlink interface
	537	*
	538	* This initialization function registers the nfc netlink family.
	539	*/
	540	int __init nfc_genl_init(void)
	541	{
	542	int rc;
	543
	544	rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
	545	ARRAY_SIZE(nfc_genl_ops));
	546	if (rc)
	547	return rc;
	548
	549	rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
	550
	551	netlink_register_notifier(&nl_notifier);
	552
	553	return rc;
	554	}
	555
	556	/**
	557	* nfc_genl_exit() - Deinitialize netlink interface
	558	*
	559	* This exit function unregisters the nfc netlink family.
	560	*/
	561	void nfc_genl_exit(void)
	562	{
	563	netlink_unregister_notifier(&nl_notifier);
	564	genl_unregister_family(&nfc_genl_family);
	565	}