NFC: st21nfcb: Add support for secure element

The st21nfcb chipset has 3 SWP (Single Wire Protocol) lines and
supports up to 3 secure elements (UICC/eSE and µSD in the future).

Some st21nfcb firmware does not support the nci command
nci_nfcee_mode_set(NCI_NFCEE_DISABLE). For this reason, we assume
2 secures elements are always present (UICC and eSE).
They will be added to the SE list once successfully activated and
they will be available only after running through enable_se
handler or when the poll in listen mode is started.

During initialization, the white_list will be always set assuming
both UICC & eSE are present.

On eSE activation, the ATR bytes are fetched to build the command
exchange timeout.

The se_io hook will allow to transfer data over SWP. 2 kind of
events may appear data is sent over:
- ST21NFCB_EVT_TRANSMIT_DATA when receiving an apdu answer
- ST21NFCB_EVT_WTX_REQUEST when the secure element needs more time
  than expected to process a command. If this timeout expires, we
  send a software reset, and then a hardware one if it still fails.

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/nfc/st21nfcb/st21nfcb.c b/drivers/nfc/st21nfcb/st21nfcb.c
index ea63d5877831..ca9871ab3fb3 100644
--- a/drivers/nfc/st21nfcb/st21nfcb.c
+++ b/drivers/nfc/st21nfcb/st21nfcb.c
@@ -22,6 +22,7 @@
 #include <net/nfc/nci_core.h>
 
 #include "st21nfcb.h"
+#include "st21nfcb_se.h"
 
 #define DRIVER_DESC "NCI NFC driver for ST21NFCB"
 
@@ -78,6 +79,13 @@ static struct nci_ops st21nfcb_nci_ops = {
 	.close = st21nfcb_nci_close,
 	.send = st21nfcb_nci_send,
 	.get_rfprotocol = st21nfcb_nci_get_rfprotocol,
+	.discover_se = st21nfcb_nci_discover_se,
+	.enable_se = st21nfcb_nci_enable_se,
+	.disable_se = st21nfcb_nci_disable_se,
+	.se_io = st21nfcb_nci_se_io,
+	.hci_load_session = st21nfcb_hci_load_session,
+	.hci_event_received = st21nfcb_hci_event_received,
+	.hci_cmd_received = st21nfcb_hci_cmd_received,
 };
 
 int st21nfcb_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
@@ -114,9 +122,10 @@ int st21nfcb_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
 	if (r) {
 		pr_err("Cannot register nfc device to nci core\n");
 		nci_free_device(ndlc->ndev);
+		return r;
 	}
 
-	return r;
+	return st21nfcb_se_init(ndlc->ndev);
 }
 EXPORT_SYMBOL_GPL(st21nfcb_nci_probe);