NFC: Add HCI/SHDLC support to let driver check for tag presence

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>
diff --git a/include/net/nfc/hci.h b/include/net/nfc/hci.h
index 95fc0c2..ae04200 100644
--- a/include/net/nfc/hci.h
+++ b/include/net/nfc/hci.h
@@ -39,6 +39,8 @@
 	int (*data_exchange) (struct nfc_hci_dev *hdev,
 			      struct nfc_target *target,
 			      struct sk_buff *skb, struct sk_buff **res_skb);
+	int (*check_presence)(struct nfc_hci_dev *hdev,
+			      struct nfc_target *target);
 };
 
 #define NFC_HCI_MAX_CUSTOM_GATES	15