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NFC: Add a target lost netlink event

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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: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Samuel Ortiz 2012-04-10 19:43:04 +02:00 committed by John W. Linville
parent 997002785e
commit 8112a5c91d
3 changed files with 32 additions and 0 deletions
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1
include/linux/nfc.h
View File

@ -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
};

30
net/nfc/netlink.c
View File

@ -183,6 +183,36 @@ 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_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;

1
net/nfc/nfc.h
View File

@ -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);