text: /*
   * 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, see <http://www.gnu.org/licenses/>.
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
  
  #include <net/genetlink.h>
  #include <linux/nfc.h>
  #include <linux/slab.h>
  
  #include "nfc.h"
  #include "llcp.h"
  
  static const struct genl_multicast_group nfc_genl_mcgrps[] = {
  	{ .name = NFC_GENL_MCAST_EVENT_NAME, },
  };
  
  static 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 },
  	[NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
  	[NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
  	[NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 },
  	[NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 },
  	[NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 },
  	[NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
  	[NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
  				     .len = NFC_FIRMWARE_NAME_MAXSIZE },
  	[NFC_ATTR_SE_APDU] = { .type = NLA_BINARY },
  };
  
  static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
  	[NFC_SDP_ATTR_URI] = { .type = NLA_STRING },
  	[NFC_SDP_ATTR_SAP] = { .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).portid, 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;
  
  	if (target->is_iso15693) {
  		if (nla_put_u8(msg, NFC_ATTR_TARGET_ISO15693_DSFID,
  			       target->iso15693_dsfid) ||
  		    nla_put(msg, NFC_ATTR_TARGET_ISO15693_UID,
  			    sizeof(target->iso15693_uid), target->iso15693_uid))
  			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;
  	}
  
  	device_lock(&dev->dev);
  
  	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++;
  	}
  
  	device_unlock(&dev->dev);
  
  	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_portid = 0;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, 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(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  free_msg:
  	nlmsg_free(msg);
  	return -EMSGSIZE;
  }
  
  int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return -ENOMEM;
  
  	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
  			  NFC_EVENT_TARGET_LOST);
  	if (!hdr)
  		goto free_msg;
  
  	if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
  	    nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
  		goto nla_put_failure;
  
  	genlmsg_end(msg, hdr);
  
  	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
  
  	return 0;
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  free_msg:
  	nlmsg_free(msg);
  	return -EMSGSIZE;
  }
  
  int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return -ENOMEM;
  
  	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
  			  NFC_EVENT_TM_ACTIVATED);
  	if (!hdr)
  		goto free_msg;
  
  	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
  		goto nla_put_failure;
  	if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
  		goto nla_put_failure;
  
  	genlmsg_end(msg, hdr);
  
  	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
  
  	return 0;
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  free_msg:
  	nlmsg_free(msg);
  	return -EMSGSIZE;
  }
  
  int nfc_genl_tm_deactivated(struct nfc_dev *dev)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return -ENOMEM;
  
  	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
  			  NFC_EVENT_TM_DEACTIVATED);
  	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(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
  
  	return 0;
  
  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_DEFAULT_SIZE, 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(&nfc_genl_family, msg, 0, 0, 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_DEFAULT_SIZE, 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(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
  
  	return 0;
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  free_msg:
  	nlmsg_free(msg);
  	return -EMSGSIZE;
  }
  
  int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
  {
  	struct sk_buff *msg;
  	struct nlattr *sdp_attr, *uri_attr;
  	struct nfc_llcp_sdp_tlv *sdres;
  	struct hlist_node *n;
  	void *hdr;
  	int rc = -EMSGSIZE;
  	int i;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return -ENOMEM;
  
  	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
  			  NFC_EVENT_LLC_SDRES);
  	if (!hdr)
  		goto free_msg;
  
  	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
  		goto nla_put_failure;
  
  	sdp_attr = nla_nest_start(msg, NFC_ATTR_LLC_SDP);
  	if (sdp_attr == NULL) {
  		rc = -ENOMEM;
  		goto nla_put_failure;
  	}
  
  	i = 1;
  	hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
  		pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
  
  		uri_attr = nla_nest_start(msg, i++);
  		if (uri_attr == NULL) {
  			rc = -ENOMEM;
  			goto nla_put_failure;
  		}
  
  		if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
  			goto nla_put_failure;
  
  		if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
  			goto nla_put_failure;
  
  		nla_nest_end(msg, uri_attr);
  
  		hlist_del(&sdres->node);
  
  		nfc_llcp_free_sdp_tlv(sdres);
  	}
  
  	nla_nest_end(msg, sdp_attr);
  
  	genlmsg_end(msg, hdr);
  
  	return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  
  free_msg:
  	nlmsg_free(msg);
  
  	nfc_llcp_free_sdp_tlv_list(sdres_list);
  
  	return rc;
  }
  
  int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return -ENOMEM;
  
  	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
  			  NFC_EVENT_SE_ADDED);
  	if (!hdr)
  		goto free_msg;
  
  	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
  	    nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
  	    nla_put_u8(msg, NFC_ATTR_SE_TYPE, type))
  		goto nla_put_failure;
  
  	genlmsg_end(msg, hdr);
  
  	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
  
  	return 0;
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  free_msg:
  	nlmsg_free(msg);
  	return -EMSGSIZE;
  }
  
  int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return -ENOMEM;
  
  	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
  			  NFC_EVENT_SE_REMOVED);
  	if (!hdr)
  		goto free_msg;
  
  	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
  	    nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx))
  		goto nla_put_failure;
  
  	genlmsg_end(msg, hdr);
  
  	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, 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 portid, u32 seq,
  				struct netlink_callback *cb,
  				int flags)
  {
  	void *hdr;
  
  	hdr = genlmsg_put(msg, portid, 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) ||
  	    nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
  		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).portid,
  					  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_DEFAULT_SIZE, 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(&nfc_genl_family, msg, 0, 0, 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_DEFAULT_SIZE, 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(&nfc_genl_family, msg, 0, 0, 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_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg) {
  		rc = -ENOMEM;
  		goto out_putdev;
  	}
  
  	rc = nfc_genl_send_device(msg, dev, info->snd_portid, 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 im_protocols = 0, tm_protocols = 0;
  
  	pr_debug("Poll start\n");
  
  	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
  	    ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
  	      !info->attrs[NFC_ATTR_PROTOCOLS]) &&
  	      !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
  		return -EINVAL;
  
  	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
  
  	if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
  		tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
  
  	if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
  		im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
  	else if (info->attrs[NFC_ATTR_PROTOCOLS])
  		im_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, im_protocols, tm_protocols);
  	if (!rc)
  		dev->genl_data.poll_req_portid = info->snd_portid;
  
  	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;
  
  	device_lock(&dev->dev);
  
  	if (!dev->polling) {
  		device_unlock(&dev->dev);
  		return -EINVAL;
  	}
  
  	device_unlock(&dev->dev);
  
  	mutex_lock(&dev->genl_data.genl_data_mutex);
  
  	if (dev->genl_data.poll_req_portid != info->snd_portid) {
  		rc = -EBUSY;
  		goto out;
  	}
  
  	rc = nfc_stop_poll(dev);
  	dev->genl_data.poll_req_portid = 0;
  
  out:
  	mutex_unlock(&dev->genl_data.genl_data_mutex);
  	nfc_put_device(dev);
  	return rc;
  }
  
  static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
  {
  	struct nfc_dev *dev;
  	u32 device_idx, target_idx, protocol;
  	int rc;
  
  	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
  		return -EINVAL;
  
  	device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
  
  	dev = nfc_get_device(device_idx);
  	if (!dev)
  		return -ENODEV;
  
  	target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
  	protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
  
  	nfc_deactivate_target(dev, target_idx);
  	rc = nfc_activate_target(dev, target_idx, protocol);
  
  	nfc_put_device(dev);
  	return 0;
  }
  
  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 int nfc_genl_send_params(struct sk_buff *msg,
  				struct nfc_llcp_local *local,
  				u32 portid, u32 seq)
  {
  	void *hdr;
  
  	hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
  			  NFC_CMD_LLC_GET_PARAMS);
  	if (!hdr)
  		return -EMSGSIZE;
  
  	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
  	    nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
  	    nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
  	    nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
  		goto nla_put_failure;
  
  	return genlmsg_end(msg, hdr);
  
  nla_put_failure:
  
  	genlmsg_cancel(msg, hdr);
  	return -EMSGSIZE;
  }
  
  static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
  {
  	struct nfc_dev *dev;
  	struct nfc_llcp_local *local;
  	int rc = 0;
  	struct sk_buff *msg = NULL;
  	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;
  
  	device_lock(&dev->dev);
  
  	local = nfc_llcp_find_local(dev);
  	if (!local) {
  		rc = -ENODEV;
  		goto exit;
  	}
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg) {
  		rc = -ENOMEM;
  		goto exit;
  	}
  
  	rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
  
  exit:
  	device_unlock(&dev->dev);
  
  	nfc_put_device(dev);
  
  	if (rc < 0) {
  		if (msg)
  			nlmsg_free(msg);
  
  		return rc;
  	}
  
  	return genlmsg_reply(msg, info);
  }
  
  static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
  {
  	struct nfc_dev *dev;
  	struct nfc_llcp_local *local;
  	u8 rw = 0;
  	u16 miux = 0;
  	u32 idx;
  	int rc = 0;
  
  	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
  	    (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
  	     !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
  	     !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
  		return -EINVAL;
  
  	if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
  		rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
  
  		if (rw > LLCP_MAX_RW)
  			return -EINVAL;
  	}
  
  	if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
  		miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
  
  		if (miux > LLCP_MAX_MIUX)
  			return -EINVAL;
  	}
  
  	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
  
  	dev = nfc_get_device(idx);
  	if (!dev)
  		return -ENODEV;
  
  	device_lock(&dev->dev);
  
  	local = nfc_llcp_find_local(dev);
  	if (!local) {
  		nfc_put_device(dev);
  		rc = -ENODEV;
  		goto exit;
  	}
  
  	if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
  		if (dev->dep_link_up) {
  			rc = -EINPROGRESS;
  			goto exit;
  		}
  
  		local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
  	}
  
  	if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
  		local->rw = rw;
  
  	if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
  		local->miux = cpu_to_be16(miux);
  
  exit:
  	device_unlock(&dev->dev);
  
  	nfc_put_device(dev);
  
  	return rc;
  }
  
  static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
  {
  	struct nfc_dev *dev;
  	struct nfc_llcp_local *local;
  	struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
  	u32 idx;
  	u8 tid;
  	char *uri;
  	int rc = 0, rem;
  	size_t uri_len, tlvs_len;
  	struct hlist_head sdreq_list;
  	struct nfc_llcp_sdp_tlv *sdreq;
  
  	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
  	    !info->attrs[NFC_ATTR_LLC_SDP])
  		return -EINVAL;
  
  	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
  
  	dev = nfc_get_device(idx);
  	if (!dev) {
  		rc = -ENODEV;
  		goto exit;
  	}
  
  	device_lock(&dev->dev);
  
  	if (dev->dep_link_up == false) {
  		rc = -ENOLINK;
  		goto exit;
  	}
  
  	local = nfc_llcp_find_local(dev);
  	if (!local) {
  		nfc_put_device(dev);
  		rc = -ENODEV;
  		goto exit;
  	}
  
  	INIT_HLIST_HEAD(&sdreq_list);
  
  	tlvs_len = 0;
  
  	nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
  		rc = nla_parse_nested(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
  				      nfc_sdp_genl_policy);
  
  		if (rc != 0) {
  			rc = -EINVAL;
  			goto exit;
  		}
  
  		if (!sdp_attrs[NFC_SDP_ATTR_URI])
  			continue;
  
  		uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
  		if (uri_len == 0)
  			continue;
  
  		uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
  		if (uri == NULL || *uri == 0)
  			continue;
  
  		tid = local->sdreq_next_tid++;
  
  		sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
  		if (sdreq == NULL) {
  			rc = -ENOMEM;
  			goto exit;
  		}
  
  		tlvs_len += sdreq->tlv_len;
  
  		hlist_add_head(&sdreq->node, &sdreq_list);
  	}
  
  	if (hlist_empty(&sdreq_list)) {
  		rc = -EINVAL;
  		goto exit;
  	}
  
  	rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
  exit:
  	device_unlock(&dev->dev);
  
  	nfc_put_device(dev);
  
  	return rc;
  }
  
  static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
  {
  	struct nfc_dev *dev;
  	int rc;
  	u32 idx;
  	char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
  
  	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;
  
  	nla_strlcpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
  		    sizeof(firmware_name));
  
  	rc = nfc_fw_download(dev, firmware_name);
  
  	nfc_put_device(dev);
  	return rc;
  }
  
  int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
  			      u32 result)
  {
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg)
  		return -ENOMEM;
  
  	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
  			  NFC_CMD_FW_DOWNLOAD);
  	if (!hdr)
  		goto free_msg;
  
  	if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
  	    nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
  	    nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
  		goto nla_put_failure;
  
  	genlmsg_end(msg, hdr);
  
  	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
  
  	return 0;
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  free_msg:
  	nlmsg_free(msg);
  	return -EMSGSIZE;
  }
  
  static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
  {
  	struct nfc_dev *dev;
  	int rc;
  	u32 idx, se_idx;
  
  	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
  	    !info->attrs[NFC_ATTR_SE_INDEX])
  		return -EINVAL;
  
  	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
  	se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
  
  	dev = nfc_get_device(idx);
  	if (!dev)
  		return -ENODEV;
  
  	rc = nfc_enable_se(dev, se_idx);
  
  	nfc_put_device(dev);
  	return rc;
  }
  
  static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
  {
  	struct nfc_dev *dev;
  	int rc;
  	u32 idx, se_idx;
  
  	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
  	    !info->attrs[NFC_ATTR_SE_INDEX])
  		return -EINVAL;
  
  	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
  	se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
  
  	dev = nfc_get_device(idx);
  	if (!dev)
  		return -ENODEV;
  
  	rc = nfc_disable_se(dev, se_idx);
  
  	nfc_put_device(dev);
  	return rc;
  }
  
  static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
  				u32 portid, u32 seq,
  				struct netlink_callback *cb,
  				int flags)
  {
  	void *hdr;
  	struct nfc_se *se, *n;
  
  	list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
  		hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
  				  NFC_CMD_GET_SE);
  		if (!hdr)
  			goto nla_put_failure;
  
  		if (cb)
  			genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
  
  		if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
  		    nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
  		    nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
  			goto nla_put_failure;
  
  		if (genlmsg_end(msg, hdr) < 0)
  			goto nla_put_failure;
  	}
  
  	return 0;
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  	return -EMSGSIZE;
  }
  
  static int nfc_genl_dump_ses(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_se(skb, dev, NETLINK_CB(cb->skb).portid,
  					  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_ses_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_se_io(struct nfc_dev *dev, u32 se_idx,
  		     u8 *apdu, size_t apdu_length,
  		     se_io_cb_t cb, void *cb_context)
  {
  	struct nfc_se *se;
  	int rc;
  
  	pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
  
  	device_lock(&dev->dev);
  
  	if (!device_is_registered(&dev->dev)) {
  		rc = -ENODEV;
  		goto error;
  	}
  
  	if (!dev->dev_up) {
  		rc = -ENODEV;
  		goto error;
  	}
  
  	if (!dev->ops->se_io) {
  		rc = -EOPNOTSUPP;
  		goto error;
  	}
  
  	se = nfc_find_se(dev, se_idx);
  	if (!se) {
  		rc = -EINVAL;
  		goto error;
  	}
  
  	if (se->state != NFC_SE_ENABLED) {
  		rc = -ENODEV;
  		goto error;
  	}
  
  	rc = dev->ops->se_io(dev, se_idx, apdu,
  			apdu_length, cb, cb_context);
  
  error:
  	device_unlock(&dev->dev);
  	return rc;
  }
  
  struct se_io_ctx {
  	u32 dev_idx;
  	u32 se_idx;
  };
  
  static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
  {
  	struct se_io_ctx *ctx = context;
  	struct sk_buff *msg;
  	void *hdr;
  
  	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!msg) {
  		kfree(ctx);
  		return;
  	}
  
  	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
  			  NFC_CMD_SE_IO);
  	if (!hdr)
  		goto free_msg;
  
  	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
  	    nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
  	    nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
  		goto nla_put_failure;
  
  	genlmsg_end(msg, hdr);
  
  	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
  
  	kfree(ctx);
  
  	return;
  
  nla_put_failure:
  	genlmsg_cancel(msg, hdr);
  free_msg:
  	nlmsg_free(msg);
  	kfree(ctx);
  
  	return;
  }
  
  static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
  {
  	struct nfc_dev *dev;
  	struct se_io_ctx *ctx;
  	u32 dev_idx, se_idx;
  	u8 *apdu;
  	size_t apdu_len;
  
  	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
  	    !info->attrs[NFC_ATTR_SE_INDEX] ||
  	    !info->attrs[NFC_ATTR_SE_APDU])
  		return -EINVAL;
  
  	dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
  	se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
  
  	dev = nfc_get_device(dev_idx);
  	if (!dev)
  		return -ENODEV;
  
  	if (!dev->ops || !dev->ops->se_io)
  		return -ENOTSUPP;
  
  	apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
  	if (apdu_len == 0)
  		return -EINVAL;
  
  	apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
  	if (!apdu)
  		return -EINVAL;
  
  	ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
  	if (!ctx)
  		return -ENOMEM;
  
  	ctx->dev_idx = dev_idx;
  	ctx->se_idx = se_idx;
  
  	return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
  }
  
  static const 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,
  	},
  	{
  		.cmd = NFC_CMD_LLC_GET_PARAMS,
  		.doit = nfc_genl_llc_get_params,
  		.policy = nfc_genl_policy,
  	},
  	{
  		.cmd = NFC_CMD_LLC_SET_PARAMS,
  		.doit = nfc_genl_llc_set_params,
  		.policy = nfc_genl_policy,
  	},
  	{
  		.cmd = NFC_CMD_LLC_SDREQ,
  		.doit = nfc_genl_llc_sdreq,
  		.policy = nfc_genl_policy,
  	},
  	{
  		.cmd = NFC_CMD_FW_DOWNLOAD,
  		.doit = nfc_genl_fw_download,
  		.policy = nfc_genl_policy,
  	},
  	{
  		.cmd = NFC_CMD_ENABLE_SE,
  		.doit = nfc_genl_enable_se,
  		.policy = nfc_genl_policy,
  	},
  	{
  		.cmd = NFC_CMD_DISABLE_SE,
  		.doit = nfc_genl_disable_se,
  		.policy = nfc_genl_policy,
  	},
  	{
  		.cmd = NFC_CMD_GET_SE,
  		.dumpit = nfc_genl_dump_ses,
  		.done = nfc_genl_dump_ses_done,
  		.policy = nfc_genl_policy,
  	},
  	{
  		.cmd = NFC_CMD_SE_IO,
  		.doit = nfc_genl_se_io,
  		.policy = nfc_genl_policy,
  	},
  	{
  		.cmd = NFC_CMD_ACTIVATE_TARGET,
  		.doit = nfc_genl_activate_target,
  		.policy = nfc_genl_policy,
  	},
  };
  
  
  struct urelease_work {
  	struct	work_struct w;
  	int	portid;
  };
  
  static void nfc_urelease_event_work(struct work_struct *work)
  {
  	struct urelease_work *w = container_of(work, struct urelease_work, w);
  	struct class_dev_iter iter;
  	struct nfc_dev *dev;
  
  	pr_debug("portid %d\n", w->portid);
  
  	mutex_lock(&nfc_devlist_mutex);
  
  	nfc_device_iter_init(&iter);
  	dev = nfc_device_iter_next(&iter);
  
  	while (dev) {
  		mutex_lock(&dev->genl_data.genl_data_mutex);
  
  		if (dev->genl_data.poll_req_portid == w->portid) {
  			nfc_stop_poll(dev);
  			dev->genl_data.poll_req_portid = 0;
  		}
  
  		mutex_unlock(&dev->genl_data.genl_data_mutex);
  
  		dev = nfc_device_iter_next(&iter);
  	}
  
  	nfc_device_iter_exit(&iter);
  
  	mutex_unlock(&nfc_devlist_mutex);
  
  	kfree(w);
  }
  
  static int nfc_genl_rcv_nl_event(struct notifier_block *this,
  				 unsigned long event, void *ptr)
  {
  	struct netlink_notify *n = ptr;
  	struct urelease_work *w;
  
  	if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
  		goto out;
  
  	pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
  
  	w = kmalloc(sizeof(*w), GFP_ATOMIC);
  	if (w) {
  		INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
  		w->portid = n->portid;
  		schedule_work((struct work_struct *) w);
  	}
  
  out:
  	return NOTIFY_DONE;
  }
  
  void nfc_genl_data_init(struct nfc_genl_data *genl_data)
  {
  	genl_data->poll_req_portid = 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_groups(&nfc_genl_family,
  						  nfc_genl_ops,
  						  nfc_genl_mcgrps);
  	if (rc)
  		return rc;
  
  	netlink_register_notifier(&nl_notifier);
  
  	return 0;
  }
  
  /**
   * 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);
  }
  