NFC: st21nfcb: Configure CLF with NCI proprietary command

In order to prevent any NFC feature when NFC is disable and
to save power, (down to 4uA) put the CLF in hibernate mode
with RF deactivated.
Add the equivalent to enable the NFC feature when initiating
the st21nfcb driver.
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/st21nfcb/ndlc.c

@@ -66,9 +66,19 @@ EXPORT_SYMBOL(ndlc_open);
 
 void ndlc_close(struct llt_ndlc *ndlc)
 {
+	struct nci_mode_set_cmd cmd;
+
+	cmd.cmd_type = ST21NFCB_NCI_SET_NFC_MODE;
+	cmd.mode = 0;
+
 	/* toggle reset pin */
-	ndlc->ops->disable(ndlc->phy_id);
+	ndlc->ops->enable(ndlc->phy_id);
+
+	nci_prop_cmd(ndlc->ndev, ST21NFCB_NCI_CORE_PROP,
+		     sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
+
 	ndlc->powered = 0;
+	ndlc->ops->disable(ndlc->phy_id);
 }
 EXPORT_SYMBOL(ndlc_close);
 

drivers/nfc/st21nfcb/st21nfcb.c

@@ -30,6 +30,17 @@
 
 #define ST21NFCB_NCI1_X_PROPRIETARY_ISO15693 0x83
 
+static int st21nfcb_nci_init(struct nci_dev *ndev)
+{
+	struct nci_mode_set_cmd cmd;
+
+	cmd.cmd_type = ST21NFCB_NCI_SET_NFC_MODE;
+	cmd.mode = 1;
+
+	return nci_prop_cmd(ndev, ST21NFCB_NCI_CORE_PROP,
+			sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
+}
+
 static int st21nfcb_nci_open(struct nci_dev *ndev)
 {
 	struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
@@ -96,6 +107,7 @@ static struct nci_prop_ops st21nfcb_nci_prop_ops[] = {
 };
 
 static struct nci_ops st21nfcb_nci_ops = {
+	.init = st21nfcb_nci_init,
 	.open = st21nfcb_nci_open,
 	.close = st21nfcb_nci_close,
 	.send = st21nfcb_nci_send,

drivers/nfc/st21nfcb/st21nfcb.h

@@ -26,6 +26,12 @@
 #define ST21NFCB_NCI_RUNNING			1
 
 #define ST21NFCB_NCI_CORE_PROP                0x01
+#define ST21NFCB_NCI_SET_NFC_MODE             0x02
+
+struct nci_mode_set_cmd {
+	u8 cmd_type;
+	u8 mode;
+} __packed;
 
 struct nci_mode_set_rsp {
 	u8 status;