NFC: Introduce target mode rx data callback

This routine will be called by drivers whenever they receive data in target
mode. This should be unexpected events and as such should be handled by a
standalone API (i.e. not as a callback pointer from an existing API).

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/net/nfc/core.c b/net/nfc/core.c
index 76c1e20..6a3799e 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -462,6 +462,18 @@
 }
 EXPORT_SYMBOL(nfc_get_local_general_bytes);
 
+int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
+{
+	/* Only LLCP target mode for now */
+	if (dev->dep_link_up == false) {
+		kfree_skb(skb);
+		return -ENOLINK;
+	}
+
+	return nfc_llcp_data_received(dev, skb);
+}
+EXPORT_SYMBOL(nfc_tm_data_received);
+
 int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
 		     u8 *gb, size_t gb_len)
 {