NFC: Implement NCI dep_link_up and dep_link_down

During NFC-DEP target activation, store the remote
general bytes to be used later in dep_link_up.
When dep_link_up is called, activate the NFC-DEP target,
and forward the remote general bytes.
When dep_link_down is called, deactivate the target.

Signed-off-by: Ilan Elias <ilane@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

include/net/nfc/nci_core.h

@@ -138,6 +138,10 @@ struct nci_dev {
 	data_exchange_cb_t	data_exchange_cb;
 	void			*data_exchange_cb_context;
 	struct sk_buff		*rx_data_reassembly;
+
+	/* stored during intf_activated_ntf */
+	__u8 remote_gb[NFC_MAX_GT_LEN];
+	__u8 remote_gb_len;
 };
 
 /* ----- NCI Devices ----- */

include/net/nfc/nfc.h

@@ -72,6 +72,7 @@ struct nfc_ops {
 
 #define NFC_TARGET_IDX_ANY -1
 #define NFC_MAX_GT_LEN 48
+#define NFC_ATR_RES_GT_OFFSET 15
 
 struct nfc_target {
 	u32 idx;