From 41fc2f50a7a2bfef1deaf78107a4d7b5bf4bd7a5 Mon Sep 17 00:00:00 2001
From: Christophe Ricard <christophe.ricard@gmail.com>
Date: Sat, 6 Jun 2015 13:16:52 +0200
Subject: 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>

diff --git a/drivers/nfc/st21nfcb/ndlc.c b/drivers/nfc/st21nfcb/ndlc.c
index 3ee22b4..91e81f3 100644
--- a/drivers/nfc/st21nfcb/ndlc.c
+++ b/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);
 
diff --git a/drivers/nfc/st21nfcb/st21nfcb.c b/drivers/nfc/st21nfcb/st21nfcb.c
index 50ad6d0..a16c3a3 100644
--- a/drivers/nfc/st21nfcb/st21nfcb.c
+++ b/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,
diff --git a/drivers/nfc/st21nfcb/st21nfcb.h b/drivers/nfc/st21nfcb/st21nfcb.h
index 7c12d9d..7106363 100644
--- a/drivers/nfc/st21nfcb/st21nfcb.h
+++ b/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;
-- 
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