Commit 8112a5c9 authored by Samuel Ortiz's avatar Samuel Ortiz Committed by John W. Linville
Browse files

NFC: Add a target lost netlink event 



Some chips are capable of detecting when a tag is out of the field, so
they could send a netlink event about it to userspace.

Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 99700278

include/linux/nfc.h

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ enum nfc_commands { 
	NFC_EVENT_TARGETS_FOUND,

	NFC_EVENT_DEVICE_ADDED,

	NFC_EVENT_DEVICE_REMOVED,

	NFC_EVENT_TARGET_LOST,

/* private: internal use only */

	__NFC_CMD_AFTER_LAST

};

net/nfc/netlink.c

+30 −0
Original line number Diff line number Diff line
@@ -183,6 +183,36 @@ int nfc_genl_targets_found(struct nfc_dev *dev) 
	return -EMSGSIZE;

}



int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)

{

	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_TARGET_LOST);

	if (!hdr)

		goto free_msg;



	NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));

	NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target_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;

}



int nfc_genl_device_added(struct nfc_dev *dev)

{

	struct sk_buff *msg;

net/nfc/nfc.h

+1 −0
Original line number Diff line number Diff line
@@ -119,6 +119,7 @@ void nfc_genl_data_init(struct nfc_genl_data *genl_data); 
void nfc_genl_data_exit(struct nfc_genl_data *genl_data);



int nfc_genl_targets_found(struct nfc_dev *dev);

int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx);



int nfc_genl_device_added(struct nfc_dev *dev);

int nfc_genl_device_removed(struct nfc_dev *dev);