NFC: Export target lost function

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>

2 files changed, 40 insertions, 0 deletions

diff --git a/include/net/nfc/nfc.h b/include/net/nfc/nfc.h
index bac070bf3514..57ea09533ae1 100644
--- a/include/net/nfc/nfc.h
+++ b/include/net/nfc/nfc.h
@@ -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);
diff --git a/net/nfc/core.c b/net/nfc/core.c
index 295d129864d2..deb4721ce8a1 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -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);