[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 },
	[NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
	[NFC_ATTR_RF_MODE] = { .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);

	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;
}

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, rf;

	pr_debug("DEP link up\n");

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
			!info->attrs[NFC_ATTR_COMM_MODE] ||
			!info->attrs[NFC_ATTR_RF_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]);
	rf = nla_get_u8(info->attrs[NFC_ATTR_RF_MODE]);

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

	if (rf != NFC_RF_INITIATOR && comm != NFC_RF_TARGET)
		return -EINVAL;

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

	rc = nfc_dep_link_up(dev, tgt_idx, comm, rf);

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