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NFC: Export target lost function

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NFC drivers will call this routine when they detect that a tag leaves the
RF field. This will eventually lead to the corresponding netlink event
to be sent.

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Eric Lapuyade 2012-04-10 19:43:05 +02:00 committed by John W. Linville
parent 8112a5c91d
commit e1da0efa2e
2 changed files with 40 additions and 0 deletions
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1
include/net/nfc/nfc.h
View file

@ -181,6 +181,7 @@ int nfc_set_remote_general_bytes(struct nfc_dev *dev,
int nfc_targets_found(struct nfc_dev *dev,
struct nfc_target *targets, int ntargets);
int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);
int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
u8 comm_mode, u8 rf_mode);

39
net/nfc/core.c
View file

@ -455,6 +455,45 @@ int nfc_targets_found(struct nfc_dev *dev,
}
EXPORT_SYMBOL(nfc_targets_found);
int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
{
struct nfc_target *tg;
int i;
pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);
spin_lock_bh(&dev->targets_lock);
for (i = 0; i < dev->n_targets; i++) {
tg = &dev->targets[i];
if (tg->idx == target_idx)
break;
}
if (i == dev->n_targets) {
spin_unlock_bh(&dev->targets_lock);
return -EINVAL;
}
dev->targets_generation++;
dev->n_targets--;
if (dev->n_targets) {
memcpy(&dev->targets[i], &dev->targets[i + 1],
(dev->n_targets - i) * sizeof(struct nfc_target));
} else {
kfree(dev->targets);
dev->targets = NULL;
}
spin_unlock_bh(&dev->targets_lock);
nfc_genl_target_lost(dev, target_idx);
return 0;
}
EXPORT_SYMBOL(nfc_target_lost);
static void nfc_release(struct device *d)
{
struct nfc_dev *dev = to_nfc_dev(d);