nfc: st-nci: Rename st21nfcb to st-nci

STMicroelectronics NFC NCI chips family is extending
with the new ST21NFCC using the AMS AS39230 RF booster.
The st21nfcb driver is relevant for this solution and
might be with future products.

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

9 files changed, 1794 insertions, 0 deletions

diff --git a/drivers/nfc/st-nci/Kconfig b/drivers/nfc/st-nci/Kconfig
new file mode 100644
index 0000000..fc3904c
--- /dev/null
+++ b/drivers/nfc/st-nci/Kconfig
@@ -0,0 +1,23 @@
+config NFC_ST_NCI
+	tristate "STMicroelectronics ST NCI NFC driver"
+	depends on NFC_NCI
+	default n
+	---help---
+	  STMicroelectronics NFC NCI chips core driver. It implements the chipset
+	  NCI logic and hooks into the NFC kernel APIs. Physical layers will
+	  register against it.
+
+	  To compile this driver as a module, choose m here. The module will
+	  be called st-nci.
+	  Say N if unsure.
+
+config NFC_ST_NCI_I2C
+	tristate "NFC ST NCI i2c support"
+	depends on NFC_ST_NCI && I2C
+	---help---
+	  This module adds support for an I2C interface to the
+	  STMicroelectronics NFC NCI chips familly.
+	  Select this if your platform is using the i2c bus.
+
+	  If you choose to build a module, it'll be called st-nci_i2c.
+	  Say N if unsure.
diff --git a/drivers/nfc/st-nci/Makefile b/drivers/nfc/st-nci/Makefile
new file mode 100644
index 0000000..0df157d
--- /dev/null
+++ b/drivers/nfc/st-nci/Makefile
@@ -0,0 +1,9 @@
+#
+# Makefile for ST21NFCB NCI based NFC driver
+#
+
+st-nci-objs = ndlc.o core.o st-nci_se.o
+obj-$(CONFIG_NFC_ST_NCI)     += st-nci.o
+
+st-nci_i2c-objs = i2c.o
+obj-$(CONFIG_NFC_ST_NCI_I2C) += st-nci_i2c.o
diff --git a/drivers/nfc/st-nci/core.c b/drivers/nfc/st-nci/core.c
new file mode 100644
index 0000000..c419d39
--- /dev/null
+++ b/drivers/nfc/st-nci/core.c
@@ -0,0 +1,179 @@
+/*
+ * NCI based Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014-2015  STMicroelectronics SAS. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/nfc.h>
+#include <net/nfc/nci.h>
+#include <net/nfc/nci_core.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+
+#include "st-nci.h"
+#include "st-nci_se.h"
+
+#define DRIVER_DESC "NCI NFC driver for ST_NCI"
+
+#define ST_NCI1_X_PROPRIETARY_ISO15693 0x83
+
+static int st_nci_init(struct nci_dev *ndev)
+{
+	struct nci_mode_set_cmd cmd;
+
+	cmd.cmd_type = ST_NCI_SET_NFC_MODE;
+	cmd.mode = 1;
+
+	return nci_prop_cmd(ndev, ST_NCI_CORE_PROP,
+			sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
+}
+
+static int st_nci_open(struct nci_dev *ndev)
+{
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+	int r;
+
+	if (test_and_set_bit(ST_NCI_RUNNING, &info->flags))
+		return 0;
+
+	r = ndlc_open(info->ndlc);
+	if (r)
+		clear_bit(ST_NCI_RUNNING, &info->flags);
+
+	return r;
+}
+
+static int st_nci_close(struct nci_dev *ndev)
+{
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+
+	if (!test_bit(ST_NCI_RUNNING, &info->flags))
+		return 0;
+
+	ndlc_close(info->ndlc);
+
+	clear_bit(ST_NCI_RUNNING, &info->flags);
+
+	return 0;
+}
+
+static int st_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
+{
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+
+	skb->dev = (void *)ndev;
+
+	if (!test_bit(ST_NCI_RUNNING, &info->flags))
+		return -EBUSY;
+
+	return ndlc_send(info->ndlc, skb);
+}
+
+static __u32 st_nci_get_rfprotocol(struct nci_dev *ndev,
+					 __u8 rf_protocol)
+{
+	return rf_protocol == ST_NCI1_X_PROPRIETARY_ISO15693 ?
+		NFC_PROTO_ISO15693_MASK : 0;
+}
+
+static int st_nci_prop_rsp_packet(struct nci_dev *ndev,
+					struct sk_buff *skb)
+{
+	__u8 status = skb->data[0];
+
+	nci_req_complete(ndev, status);
+	return 0;
+}
+
+static struct nci_prop_ops st_nci_prop_ops[] = {
+	{
+		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
+					  ST_NCI_CORE_PROP),
+		.rsp = st_nci_prop_rsp_packet,
+	},
+};
+
+static struct nci_ops st_nci_ops = {
+	.init = st_nci_init,
+	.open = st_nci_open,
+	.close = st_nci_close,
+	.send = st_nci_send,
+	.get_rfprotocol = st_nci_get_rfprotocol,
+	.discover_se = st_nci_discover_se,
+	.enable_se = st_nci_enable_se,
+	.disable_se = st_nci_disable_se,
+	.se_io = st_nci_se_io,
+	.hci_load_session = st_nci_hci_load_session,
+	.hci_event_received = st_nci_hci_event_received,
+	.hci_cmd_received = st_nci_hci_cmd_received,
+	.prop_ops = st_nci_prop_ops,
+	.n_prop_ops = ARRAY_SIZE(st_nci_prop_ops),
+};
+
+int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
+		       int phy_tailroom)
+{
+	struct st_nci_info *info;
+	int r;
+	u32 protocols;
+
+	info = devm_kzalloc(ndlc->dev,
+			sizeof(struct st_nci_info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	protocols = NFC_PROTO_JEWEL_MASK
+		| NFC_PROTO_MIFARE_MASK
+		| NFC_PROTO_FELICA_MASK
+		| NFC_PROTO_ISO14443_MASK
+		| NFC_PROTO_ISO14443_B_MASK
+		| NFC_PROTO_ISO15693_MASK
+		| NFC_PROTO_NFC_DEP_MASK;
+
+	ndlc->ndev = nci_allocate_device(&st_nci_ops, protocols,
+					phy_headroom, phy_tailroom);
+	if (!ndlc->ndev) {
+		pr_err("Cannot allocate nfc ndev\n");
+		return -ENOMEM;
+	}
+	info->ndlc = ndlc;
+
+	nci_set_drvdata(ndlc->ndev, info);
+
+	r = nci_register_device(ndlc->ndev);
+	if (r) {
+		pr_err("Cannot register nfc device to nci core\n");
+		nci_free_device(ndlc->ndev);
+		return r;
+	}
+
+	return st_nci_se_init(ndlc->ndev);
+}
+EXPORT_SYMBOL_GPL(st_nci_probe);
+
+void st_nci_remove(struct nci_dev *ndev)
+{
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+
+	ndlc_close(info->ndlc);
+
+	nci_unregister_device(ndev);
+	nci_free_device(ndev);
+}
+EXPORT_SYMBOL_GPL(st_nci_remove);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/nfc/st-nci/i2c.c b/drivers/nfc/st-nci/i2c.c
new file mode 100644
index 0000000..06175ce
--- /dev/null
+++ b/drivers/nfc/st-nci/i2c.c
@@ -0,0 +1,385 @@
+/*
+ * I2C Link Layer for ST NCI NFC controller familly based Driver
+ * Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/nfc.h>
+#include <linux/platform_data/st_nci.h>
+
+#include "ndlc.h"
+
+#define DRIVER_DESC "NCI NFC driver for ST21NFCB"
+
+/* ndlc header */
+#define ST21NFCB_FRAME_HEADROOM	1
+#define ST21NFCB_FRAME_TAILROOM 0
+
+#define ST_NCI_I2C_MIN_SIZE 4   /* PCB(1) + NCI Packet header(3) */
+#define ST_NCI_I2C_MAX_SIZE 250 /* req 4.2.1 */
+
+#define ST_NCI_I2C_DRIVER_NAME "st_nci_i2c"
+
+static struct i2c_device_id st_nci_i2c_id_table[] = {
+	{ST_NCI_DRIVER_NAME, 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, st_nci_i2c_id_table);
+
+struct st_nci_i2c_phy {
+	struct i2c_client *i2c_dev;
+	struct llt_ndlc *ndlc;
+
+	unsigned int gpio_reset;
+	unsigned int irq_polarity;
+};
+
+#define I2C_DUMP_SKB(info, skb)					\
+do {								\
+	pr_debug("%s:\n", info);				\
+	print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET,	\
+		       16, 1, (skb)->data, (skb)->len, 0);	\
+} while (0)
+
+static int st_nci_i2c_enable(void *phy_id)
+{
+	struct st_nci_i2c_phy *phy = phy_id;
+
+	gpio_set_value(phy->gpio_reset, 0);
+	usleep_range(10000, 15000);
+	gpio_set_value(phy->gpio_reset, 1);
+	usleep_range(80000, 85000);
+
+	if (phy->ndlc->powered == 0)
+		enable_irq(phy->i2c_dev->irq);
+
+	return 0;
+}
+
+static void st_nci_i2c_disable(void *phy_id)
+{
+	struct st_nci_i2c_phy *phy = phy_id;
+
+	disable_irq_nosync(phy->i2c_dev->irq);
+}
+
+/*
+ * Writing a frame must not return the number of written bytes.
+ * It must return either zero for success, or <0 for error.
+ * In addition, it must not alter the skb
+ */
+static int st_nci_i2c_write(void *phy_id, struct sk_buff *skb)
+{
+	int r = -1;
+	struct st_nci_i2c_phy *phy = phy_id;
+	struct i2c_client *client = phy->i2c_dev;
+
+	I2C_DUMP_SKB("st_nci_i2c_write", skb);
+
+	if (phy->ndlc->hard_fault != 0)
+		return phy->ndlc->hard_fault;
+
+	r = i2c_master_send(client, skb->data, skb->len);
+	if (r < 0) {  /* Retry, chip was in standby */
+		usleep_range(1000, 4000);
+		r = i2c_master_send(client, skb->data, skb->len);
+	}
+
+	if (r >= 0) {
+		if (r != skb->len)
+			r = -EREMOTEIO;
+		else
+			r = 0;
+	}
+
+	return r;
+}
+
+/*
+ * Reads an ndlc frame and returns it in a newly allocated sk_buff.
+ * returns:
+ * frame size : if received frame is complete (find ST21NFCB_SOF_EOF at
+ * end of read)
+ * -EAGAIN : if received frame is incomplete (not find ST21NFCB_SOF_EOF
+ * at end of read)
+ * -EREMOTEIO : i2c read error (fatal)
+ * -EBADMSG : frame was incorrect and discarded
+ * (value returned from st_nci_i2c_repack)
+ * -EIO : if no ST21NFCB_SOF_EOF is found after reaching
+ * the read length end sequence
+ */
+static int st_nci_i2c_read(struct st_nci_i2c_phy *phy,
+				 struct sk_buff **skb)
+{
+	int r;
+	u8 len;
+	u8 buf[ST_NCI_I2C_MAX_SIZE];
+	struct i2c_client *client = phy->i2c_dev;
+
+	r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
+	if (r < 0) {  /* Retry, chip was in standby */
+		usleep_range(1000, 4000);
+		r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
+	}
+
+	if (r != ST_NCI_I2C_MIN_SIZE)
+		return -EREMOTEIO;
+
+	len = be16_to_cpu(*(__be16 *) (buf + 2));
+	if (len > ST_NCI_I2C_MAX_SIZE) {
+		nfc_err(&client->dev, "invalid frame len\n");
+		return -EBADMSG;
+	}
+
+	*skb = alloc_skb(ST_NCI_I2C_MIN_SIZE + len, GFP_KERNEL);
+	if (*skb == NULL)
+		return -ENOMEM;
+
+	skb_reserve(*skb, ST_NCI_I2C_MIN_SIZE);
+	skb_put(*skb, ST_NCI_I2C_MIN_SIZE);
+	memcpy((*skb)->data, buf, ST_NCI_I2C_MIN_SIZE);
+
+	if (!len)
+		return 0;
+
+	r = i2c_master_recv(client, buf, len);
+	if (r != len) {
+		kfree_skb(*skb);
+		return -EREMOTEIO;
+	}
+
+	skb_put(*skb, len);
+	memcpy((*skb)->data + ST_NCI_I2C_MIN_SIZE, buf, len);
+
+	I2C_DUMP_SKB("i2c frame read", *skb);
+
+	return 0;
+}
+
+/*
+ * Reads an ndlc frame from the chip.
+ *
+ * On ST21NFCB, IRQ goes in idle state when read starts.
+ */
+static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
+{
+	struct st_nci_i2c_phy *phy = phy_id;
+	struct i2c_client *client;
+	struct sk_buff *skb = NULL;
+	int r;
+
+	if (!phy || !phy->ndlc || irq != phy->i2c_dev->irq) {
+		WARN_ON_ONCE(1);
+		return IRQ_NONE;
+	}
+
+	client = phy->i2c_dev;
+	dev_dbg(&client->dev, "IRQ\n");
+
+	if (phy->ndlc->hard_fault)
+		return IRQ_HANDLED;
+
+	if (!phy->ndlc->powered) {
+		st_nci_i2c_disable(phy);
+		return IRQ_HANDLED;
+	}
+
+	r = st_nci_i2c_read(phy, &skb);
+	if (r == -EREMOTEIO || r == -ENOMEM || r == -EBADMSG)
+		return IRQ_HANDLED;
+
+	ndlc_recv(phy->ndlc, skb);
+
+	return IRQ_HANDLED;
+}
+
+static struct nfc_phy_ops i2c_phy_ops = {
+	.write = st_nci_i2c_write,
+	.enable = st_nci_i2c_enable,
+	.disable = st_nci_i2c_disable,
+};
+
+#ifdef CONFIG_OF
+static int st_nci_i2c_of_request_resources(struct i2c_client *client)
+{
+	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
+	struct device_node *pp;
+	int gpio;
+	int r;
+
+	pp = client->dev.of_node;
+	if (!pp)
+		return -ENODEV;
+
+	/* Get GPIO from device tree */
+	gpio = of_get_named_gpio(pp, "reset-gpios", 0);
+	if (gpio < 0) {
+		nfc_err(&client->dev,
+			"Failed to retrieve reset-gpios from device tree\n");
+		return gpio;
+	}
+
+	/* GPIO request and configuration */
+	r = devm_gpio_request_one(&client->dev, gpio,
+				GPIOF_OUT_INIT_HIGH, "clf_reset");
+	if (r) {
+		nfc_err(&client->dev, "Failed to request reset pin\n");
+		return r;
+	}
+	phy->gpio_reset = gpio;
+
+	phy->irq_polarity = irq_get_trigger_type(client->irq);
+
+	return 0;
+}
+#else
+static int st_nci_i2c_of_request_resources(struct i2c_client *client)
+{
+	return -ENODEV;
+}
+#endif
+
+static int st_nci_i2c_request_resources(struct i2c_client *client)
+{
+	struct st_nci_nfc_platform_data *pdata;
+	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
+	int r;
+
+	pdata = client->dev.platform_data;
+	if (pdata == NULL) {
+		nfc_err(&client->dev, "No platform data\n");
+		return -EINVAL;
+	}
+
+	/* store for later use */
+	phy->gpio_reset = pdata->gpio_reset;
+	phy->irq_polarity = pdata->irq_polarity;
+
+	r = devm_gpio_request_one(&client->dev,
+			phy->gpio_reset, GPIOF_OUT_INIT_HIGH, "clf_reset");
+	if (r) {
+		pr_err("%s : reset gpio_request failed\n", __FILE__);
+		return r;
+	}
+
+	return 0;
+}
+
+static int st_nci_i2c_probe(struct i2c_client *client,
+				  const struct i2c_device_id *id)
+{
+	struct st_nci_i2c_phy *phy;
+	struct st_nci_nfc_platform_data *pdata;
+	int r;
+
+	dev_dbg(&client->dev, "%s\n", __func__);
+	dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
+		return -ENODEV;
+	}
+
+	phy = devm_kzalloc(&client->dev, sizeof(struct st_nci_i2c_phy),
+			   GFP_KERNEL);
+	if (!phy)
+		return -ENOMEM;
+
+	phy->i2c_dev = client;
+
+	i2c_set_clientdata(client, phy);
+
+	pdata = client->dev.platform_data;
+	if (!pdata && client->dev.of_node) {
+		r = st_nci_i2c_of_request_resources(client);
+		if (r) {
+			nfc_err(&client->dev, "No platform data\n");
+			return r;
+		}
+	} else if (pdata) {
+		r = st_nci_i2c_request_resources(client);
+		if (r) {
+			nfc_err(&client->dev,
+				"Cannot get platform resources\n");
+			return r;
+		}
+	} else {
+		nfc_err(&client->dev,
+			"st21nfcb platform resources not available\n");
+		return -ENODEV;
+	}
+
+	r = ndlc_probe(phy, &i2c_phy_ops, &client->dev,
+			ST21NFCB_FRAME_HEADROOM, ST21NFCB_FRAME_TAILROOM,
+			&phy->ndlc);
+	if (r < 0) {
+		nfc_err(&client->dev, "Unable to register ndlc layer\n");
+		return r;
+	}
+
+	r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+				st_nci_irq_thread_fn,
+				phy->irq_polarity | IRQF_ONESHOT,
+				ST_NCI_DRIVER_NAME, phy);
+	if (r < 0)
+		nfc_err(&client->dev, "Unable to register IRQ handler\n");
+
+	return r;
+}
+
+static int st_nci_i2c_remove(struct i2c_client *client)
+{
+	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
+
+	dev_dbg(&client->dev, "%s\n", __func__);
+
+	ndlc_remove(phy->ndlc);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_st_nci_i2c_match[] = {
+	{ .compatible = "st,st21nfcb-i2c", },
+	{ .compatible = "st,st21nfcb_i2c", },
+	{ .compatible = "st,st21nfcc-i2c", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, of_st_nci_i2c_match);
+#endif
+
+static struct i2c_driver st_nci_i2c_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = ST_NCI_I2C_DRIVER_NAME,
+		.of_match_table = of_match_ptr(of_st_nci_i2c_match),
+	},
+	.probe = st_nci_i2c_probe,
+	.id_table = st_nci_i2c_id_table,
+	.remove = st_nci_i2c_remove,
+};
+
+module_i2c_driver(st_nci_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/nfc/st-nci/ndlc.c b/drivers/nfc/st-nci/ndlc.c
new file mode 100644
index 0000000..56c6a4c
--- /dev/null
+++ b/drivers/nfc/st-nci/ndlc.c
@@ -0,0 +1,313 @@
+/*
+ * Low Level Transport (NDLC) Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014-2015  STMicroelectronics SAS. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/sched.h>
+#include <net/nfc/nci_core.h>
+
+#include "ndlc.h"
+#include "st-nci.h"
+
+#define NDLC_TIMER_T1		100
+#define NDLC_TIMER_T1_WAIT	400
+#define NDLC_TIMER_T2		1200
+
+#define PCB_TYPE_DATAFRAME		0x80
+#define PCB_TYPE_SUPERVISOR		0xc0
+#define PCB_TYPE_MASK			PCB_TYPE_SUPERVISOR
+
+#define PCB_SYNC_ACK			0x20
+#define PCB_SYNC_NACK			0x10
+#define PCB_SYNC_WAIT			0x30
+#define PCB_SYNC_NOINFO			0x00
+#define PCB_SYNC_MASK			PCB_SYNC_WAIT
+
+#define PCB_DATAFRAME_RETRANSMIT_YES	0x00
+#define PCB_DATAFRAME_RETRANSMIT_NO	0x04
+#define PCB_DATAFRAME_RETRANSMIT_MASK	PCB_DATAFRAME_RETRANSMIT_NO
+
+#define PCB_SUPERVISOR_RETRANSMIT_YES	0x00
+#define PCB_SUPERVISOR_RETRANSMIT_NO	0x02
+#define PCB_SUPERVISOR_RETRANSMIT_MASK	PCB_SUPERVISOR_RETRANSMIT_NO
+
+#define PCB_FRAME_CRC_INFO_PRESENT	0x08
+#define PCB_FRAME_CRC_INFO_NOTPRESENT	0x00
+#define PCB_FRAME_CRC_INFO_MASK		PCB_FRAME_CRC_INFO_PRESENT
+
+#define NDLC_DUMP_SKB(info, skb)                                 \
+do {                                                             \
+	pr_debug("%s:\n", info);                                 \
+	print_hex_dump(KERN_DEBUG, "ndlc: ", DUMP_PREFIX_OFFSET, \
+			16, 1, skb->data, skb->len, 0);          \
+} while (0)
+
+int ndlc_open(struct llt_ndlc *ndlc)
+{
+	/* toggle reset pin */
+	ndlc->ops->enable(ndlc->phy_id);
+	ndlc->powered = 1;
+	return 0;
+}
+EXPORT_SYMBOL(ndlc_open);
+
+void ndlc_close(struct llt_ndlc *ndlc)
+{
+	struct nci_mode_set_cmd cmd;
+
+	cmd.cmd_type = ST_NCI_SET_NFC_MODE;
+	cmd.mode = 0;
+
+	/* toggle reset pin */
+	ndlc->ops->enable(ndlc->phy_id);
+
+	nci_prop_cmd(ndlc->ndev, ST_NCI_CORE_PROP,
+		     sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
+
+	ndlc->powered = 0;
+	ndlc->ops->disable(ndlc->phy_id);
+}
+EXPORT_SYMBOL(ndlc_close);
+
+int ndlc_send(struct llt_ndlc *ndlc, struct sk_buff *skb)
+{
+	/* add ndlc header */
+	u8 pcb = PCB_TYPE_DATAFRAME | PCB_DATAFRAME_RETRANSMIT_NO |
+		PCB_FRAME_CRC_INFO_NOTPRESENT;
+
+	*skb_push(skb, 1) = pcb;
+	skb_queue_tail(&ndlc->send_q, skb);
+
+	schedule_work(&ndlc->sm_work);
+
+	return 0;
+}
+EXPORT_SYMBOL(ndlc_send);
+
+static void llt_ndlc_send_queue(struct llt_ndlc *ndlc)
+{
+	struct sk_buff *skb;
+	int r;
+	unsigned long time_sent;
+
+	if (ndlc->send_q.qlen)
+		pr_debug("sendQlen=%d unackQlen=%d\n",
+			 ndlc->send_q.qlen, ndlc->ack_pending_q.qlen);
+
+	while (ndlc->send_q.qlen) {
+		skb = skb_dequeue(&ndlc->send_q);
+		NDLC_DUMP_SKB("ndlc frame written", skb);
+		r = ndlc->ops->write(ndlc->phy_id, skb);
+		if (r < 0) {
+			ndlc->hard_fault = r;
+			break;
+		}
+		time_sent = jiffies;
+		*(unsigned long *)skb->cb = time_sent;
+
+		skb_queue_tail(&ndlc->ack_pending_q, skb);
+
+		/* start timer t1 for ndlc aknowledge */
+		ndlc->t1_active = true;
+		mod_timer(&ndlc->t1_timer, time_sent +
+			msecs_to_jiffies(NDLC_TIMER_T1));
+		/* start timer t2 for chip availability */
+		ndlc->t2_active = true;
+		mod_timer(&ndlc->t2_timer, time_sent +
+			msecs_to_jiffies(NDLC_TIMER_T2));
+	}
+}
+
+static void llt_ndlc_requeue_data_pending(struct llt_ndlc *ndlc)
+{
+	struct sk_buff *skb;
+	u8 pcb;
+
+	while ((skb = skb_dequeue_tail(&ndlc->ack_pending_q))) {
+		pcb = skb->data[0];
+		switch (pcb & PCB_TYPE_MASK) {
+		case PCB_TYPE_SUPERVISOR:
+			skb->data[0] = (pcb & ~PCB_SUPERVISOR_RETRANSMIT_MASK) |
+				PCB_SUPERVISOR_RETRANSMIT_YES;
+			break;
+		case PCB_TYPE_DATAFRAME:
+			skb->data[0] = (pcb & ~PCB_DATAFRAME_RETRANSMIT_MASK) |
+				PCB_DATAFRAME_RETRANSMIT_YES;
+			break;
+		default:
+			pr_err("UNKNOWN Packet Control Byte=%d\n", pcb);
+			kfree_skb(skb);
+			continue;
+		}
+		skb_queue_head(&ndlc->send_q, skb);
+	}
+}
+
+static void llt_ndlc_rcv_queue(struct llt_ndlc *ndlc)
+{
+	struct sk_buff *skb;
+	u8 pcb;
+	unsigned long time_sent;
+
+	if (ndlc->rcv_q.qlen)
+		pr_debug("rcvQlen=%d\n", ndlc->rcv_q.qlen);
+
+	while ((skb = skb_dequeue(&ndlc->rcv_q)) != NULL) {
+		pcb = skb->data[0];
+		skb_pull(skb, 1);
+		if ((pcb & PCB_TYPE_MASK) == PCB_TYPE_SUPERVISOR) {
+			switch (pcb & PCB_SYNC_MASK) {
+			case PCB_SYNC_ACK:
+				del_timer_sync(&ndlc->t1_timer);
+				del_timer_sync(&ndlc->t2_timer);
+				ndlc->t2_active = false;
+				ndlc->t1_active = false;
+				break;
+			case PCB_SYNC_NACK:
+				llt_ndlc_requeue_data_pending(ndlc);
+				llt_ndlc_send_queue(ndlc);
+				/* start timer t1 for ndlc aknowledge */
+				time_sent = jiffies;
+				ndlc->t1_active = true;
+				mod_timer(&ndlc->t1_timer, time_sent +
+					msecs_to_jiffies(NDLC_TIMER_T1));
+				break;
+			case PCB_SYNC_WAIT:
+				time_sent = jiffies;
+				ndlc->t1_active = true;
+				mod_timer(&ndlc->t1_timer, time_sent +
+					  msecs_to_jiffies(NDLC_TIMER_T1_WAIT));
+				break;
+			default:
+				pr_err("UNKNOWN Packet Control Byte=%d\n", pcb);
+				kfree_skb(skb);
+				break;
+			}
+		} else {
+			nci_recv_frame(ndlc->ndev, skb);
+		}
+	}
+}
+
+static void llt_ndlc_sm_work(struct work_struct *work)
+{
+	struct llt_ndlc *ndlc = container_of(work, struct llt_ndlc, sm_work);
+
+	llt_ndlc_send_queue(ndlc);
+	llt_ndlc_rcv_queue(ndlc);
+
+	if (ndlc->t1_active && timer_pending(&ndlc->t1_timer) == 0) {
+		pr_debug
+		    ("Handle T1(recv SUPERVISOR) elapsed (T1 now inactive)\n");
+		ndlc->t1_active = false;
+
+		llt_ndlc_requeue_data_pending(ndlc);
+		llt_ndlc_send_queue(ndlc);
+	}
+
+	if (ndlc->t2_active && timer_pending(&ndlc->t2_timer) == 0) {
+		pr_debug("Handle T2(recv DATA) elapsed (T2 now inactive)\n");
+		ndlc->t2_active = false;
+		ndlc->t1_active = false;
+		del_timer_sync(&ndlc->t1_timer);
+		del_timer_sync(&ndlc->t2_timer);
+		ndlc_close(ndlc);
+		ndlc->hard_fault = -EREMOTEIO;
+	}
+}
+
+void ndlc_recv(struct llt_ndlc *ndlc, struct sk_buff *skb)
+{
+	if (skb == NULL) {
+		pr_err("NULL Frame -> link is dead\n");
+		ndlc->hard_fault = -EREMOTEIO;
+		ndlc_close(ndlc);
+	} else {
+		NDLC_DUMP_SKB("incoming frame", skb);
+		skb_queue_tail(&ndlc->rcv_q, skb);
+	}
+
+	schedule_work(&ndlc->sm_work);
+}
+EXPORT_SYMBOL(ndlc_recv);
+
+static void ndlc_t1_timeout(unsigned long data)
+{
+	struct llt_ndlc *ndlc = (struct llt_ndlc *)data;
+
+	pr_debug("\n");
+
+	schedule_work(&ndlc->sm_work);
+}
+
+static void ndlc_t2_timeout(unsigned long data)
+{
+	struct llt_ndlc *ndlc = (struct llt_ndlc *)data;
+
+	pr_debug("\n");
+
+	schedule_work(&ndlc->sm_work);
+}
+
+int ndlc_probe(void *phy_id, struct nfc_phy_ops *phy_ops, struct device *dev,
+	       int phy_headroom, int phy_tailroom, struct llt_ndlc **ndlc_id)
+{
+	struct llt_ndlc *ndlc;
+
+	ndlc = devm_kzalloc(dev, sizeof(struct llt_ndlc), GFP_KERNEL);
+	if (!ndlc)
+		return -ENOMEM;
+
+	ndlc->ops = phy_ops;
+	ndlc->phy_id = phy_id;
+	ndlc->dev = dev;
+	ndlc->powered = 0;
+
+	*ndlc_id = ndlc;
+
+	/* initialize timers */
+	init_timer(&ndlc->t1_timer);
+	ndlc->t1_timer.data = (unsigned long)ndlc;
+	ndlc->t1_timer.function = ndlc_t1_timeout;
+
+	init_timer(&ndlc->t2_timer);
+	ndlc->t2_timer.data = (unsigned long)ndlc;
+	ndlc->t2_timer.function = ndlc_t2_timeout;
+
+	skb_queue_head_init(&ndlc->rcv_q);
+	skb_queue_head_init(&ndlc->send_q);
+	skb_queue_head_init(&ndlc->ack_pending_q);
+
+	INIT_WORK(&ndlc->sm_work, llt_ndlc_sm_work);
+
+	return st_nci_probe(ndlc, phy_headroom, phy_tailroom);
+}
+EXPORT_SYMBOL(ndlc_probe);
+
+void ndlc_remove(struct llt_ndlc *ndlc)
+{
+	st_nci_remove(ndlc->ndev);
+
+	/* cancel timers */
+	del_timer_sync(&ndlc->t1_timer);
+	del_timer_sync(&ndlc->t2_timer);
+	ndlc->t2_active = false;
+	ndlc->t1_active = false;
+
+	skb_queue_purge(&ndlc->rcv_q);
+	skb_queue_purge(&ndlc->send_q);
+}
+EXPORT_SYMBOL(ndlc_remove);
diff --git a/drivers/nfc/st-nci/ndlc.h b/drivers/nfc/st-nci/ndlc.h
new file mode 100644
index 0000000..6361005
--- /dev/null
+++ b/drivers/nfc/st-nci/ndlc.h
@@ -0,0 +1,60 @@
+/*
+ * NCI based Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014-2015  STMicroelectronics SAS. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LOCAL_NDLC_H_
+#define __LOCAL_NDLC_H_
+
+#include <linux/skbuff.h>
+#include <net/nfc/nfc.h>
+
+/* Low Level Transport description */
+struct llt_ndlc {
+	struct nci_dev *ndev;
+	struct nfc_phy_ops *ops;
+	void *phy_id;
+
+	struct timer_list t1_timer;
+	bool t1_active;
+
+	struct timer_list t2_timer;
+	bool t2_active;
+
+	struct sk_buff_head rcv_q;
+	struct sk_buff_head send_q;
+	struct sk_buff_head ack_pending_q;
+
+	struct work_struct sm_work;
+
+	struct device *dev;
+
+	/*
+	 * < 0 if hardware error occurred
+	 * and prevents normal operation.
+	 */
+	int hard_fault;
+	int powered;
+};
+
+int ndlc_open(struct llt_ndlc *ndlc);
+void ndlc_close(struct llt_ndlc *ndlc);
+int ndlc_send(struct llt_ndlc *ndlc, struct sk_buff *skb);
+void ndlc_recv(struct llt_ndlc *ndlc, struct sk_buff *skb);
+int ndlc_probe(void *phy_id, struct nfc_phy_ops *phy_ops, struct device *dev,
+	int phy_headroom, int phy_tailroom, struct llt_ndlc **ndlc_id);
+void ndlc_remove(struct llt_ndlc *ndlc);
+#endif /* __LOCAL_NDLC_H__ */
diff --git a/drivers/nfc/st-nci/st-nci.h b/drivers/nfc/st-nci/st-nci.h
new file mode 100644
index 0000000..850a239
--- /dev/null
+++ b/drivers/nfc/st-nci/st-nci.h
@@ -0,0 +1,50 @@
+/*
+ * NCI based Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014  STMicroelectronics SAS. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LOCAL_ST_NCI_H_
+#define __LOCAL_ST_NCI_H_
+
+#include "st-nci_se.h"
+#include "ndlc.h"
+
+/* Define private flags: */
+#define ST_NCI_RUNNING			1
+
+#define ST_NCI_CORE_PROP                0x01
+#define ST_NCI_SET_NFC_MODE             0x02
+
+struct nci_mode_set_cmd {
+	u8 cmd_type;
+	u8 mode;
+} __packed;
+
+struct nci_mode_set_rsp {
+	u8 status;
+} __packed;
+
+struct st_nci_info {
+	struct llt_ndlc *ndlc;
+	unsigned long flags;
+	struct st_nci_se_info se_info;
+};
+
+void st_nci_remove(struct nci_dev *ndev);
+int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
+		int phy_tailroom);
+
+#endif /* __LOCAL_ST_NCI_H_ */
diff --git a/drivers/nfc/st-nci/st-nci_se.c b/drivers/nfc/st-nci/st-nci_se.c
new file mode 100644
index 0000000..97addfa
--- /dev/null
+++ b/drivers/nfc/st-nci/st-nci_se.c
@@ -0,0 +1,714 @@
+/*
+ * Secure Element driver for STMicroelectronics NFC NCI chip
+ *
+ * Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/nfc.h>
+#include <linux/delay.h>
+#include <net/nfc/nci.h>
+#include <net/nfc/nci_core.h>
+
+#include "st-nci.h"
+#include "st-nci_se.h"
+
+struct st_nci_pipe_info {
+	u8 pipe_state;
+	u8 src_host_id;
+	u8 src_gate_id;
+	u8 dst_host_id;
+	u8 dst_gate_id;
+} __packed;
+
+/* Hosts */
+#define ST_NCI_HOST_CONTROLLER_ID     0x00
+#define ST_NCI_TERMINAL_HOST_ID       0x01
+#define ST_NCI_UICC_HOST_ID           0x02
+#define ST_NCI_ESE_HOST_ID            0xc0
+
+/* Gates */
+#define ST_NCI_DEVICE_MGNT_GATE       0x01
+#define ST_NCI_APDU_READER_GATE       0xf0
+#define ST_NCI_CONNECTIVITY_GATE      0x41
+
+/* Pipes */
+#define ST_NCI_DEVICE_MGNT_PIPE               0x02
+
+/* Connectivity pipe only */
+#define ST_NCI_SE_COUNT_PIPE_UICC             0x01
+/* Connectivity + APDU Reader pipe */
+#define ST_NCI_SE_COUNT_PIPE_EMBEDDED         0x02
+
+#define ST_NCI_SE_TO_HOT_PLUG			1000 /* msecs */
+#define ST_NCI_SE_TO_PIPES			2000
+
+#define ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(x)   (x->data[0] & 0x80)
+
+#define NCI_HCI_APDU_PARAM_ATR                     0x01
+#define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY       0x01
+#define NCI_HCI_ADMIN_PARAM_WHITELIST              0x03
+#define NCI_HCI_ADMIN_PARAM_HOST_LIST              0x04
+
+#define ST_NCI_EVT_SE_HARD_RESET		0x20
+#define ST_NCI_EVT_TRANSMIT_DATA		0x10
+#define ST_NCI_EVT_WTX_REQUEST		0x11
+#define ST_NCI_EVT_SE_SOFT_RESET		0x11
+#define ST_NCI_EVT_SE_END_OF_APDU_TRANSFER	0x21
+#define ST_NCI_EVT_HOT_PLUG			0x03
+
+#define ST_NCI_SE_MODE_OFF                    0x00
+#define ST_NCI_SE_MODE_ON                     0x01
+
+#define ST_NCI_EVT_CONNECTIVITY       0x10
+#define ST_NCI_EVT_TRANSACTION        0x12
+
+#define ST_NCI_DM_GETINFO             0x13
+#define ST_NCI_DM_GETINFO_PIPE_LIST   0x02
+#define ST_NCI_DM_GETINFO_PIPE_INFO   0x01
+#define ST_NCI_DM_PIPE_CREATED        0x02
+#define ST_NCI_DM_PIPE_OPEN           0x04
+#define ST_NCI_DM_RF_ACTIVE           0x80
+#define ST_NCI_DM_DISCONNECT          0x30
+
+#define ST_NCI_DM_IS_PIPE_OPEN(p) \
+	((p & 0x0f) == (ST_NCI_DM_PIPE_CREATED | ST_NCI_DM_PIPE_OPEN))
+
+#define ST_NCI_ATR_DEFAULT_BWI        0x04
+
+/*
+ * WT = 2^BWI/10[s], convert into msecs and add a secure
+ * room by increasing by 2 this timeout
+ */
+#define ST_NCI_BWI_TO_TIMEOUT(x)      ((1 << x) * 200)
+#define ST_NCI_ATR_GET_Y_FROM_TD(x)   (x >> 4)
+
+/* If TA is present bit 0 is set */
+#define ST_NCI_ATR_TA_PRESENT(x) (x & 0x01)
+/* If TB is present bit 1 is set */
+#define ST_NCI_ATR_TB_PRESENT(x) (x & 0x02)
+
+#define ST_NCI_NUM_DEVICES           256
+
+static DECLARE_BITMAP(dev_mask, ST_NCI_NUM_DEVICES);
+
+/* Here are the mandatory pipe for st_nci */
+static struct nci_hci_gate st_nci_gates[] = {
+	{NCI_HCI_ADMIN_GATE, NCI_HCI_ADMIN_PIPE,
+					ST_NCI_HOST_CONTROLLER_ID},
+	{NCI_HCI_LINK_MGMT_GATE, NCI_HCI_LINK_MGMT_PIPE,
+					ST_NCI_HOST_CONTROLLER_ID},
+	{ST_NCI_DEVICE_MGNT_GATE, ST_NCI_DEVICE_MGNT_PIPE,
+					ST_NCI_HOST_CONTROLLER_ID},
+
+	/* Secure element pipes are created by secure element host */
+	{ST_NCI_CONNECTIVITY_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
+					ST_NCI_HOST_CONTROLLER_ID},
+	{ST_NCI_APDU_READER_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
+					ST_NCI_HOST_CONTROLLER_ID},
+};
+
+static u8 st_nci_se_get_bwi(struct nci_dev *ndev)
+{
+	int i;
+	u8 td;
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+
+	/* Bits 8 to 5 of the first TB for T=1 encode BWI from zero to nine */
+	for (i = 1; i < ST_NCI_ESE_MAX_LENGTH; i++) {
+		td = ST_NCI_ATR_GET_Y_FROM_TD(info->se_info.atr[i]);
+		if (ST_NCI_ATR_TA_PRESENT(td))
+			i++;
+		if (ST_NCI_ATR_TB_PRESENT(td)) {
+			i++;
+			return info->se_info.atr[i] >> 4;
+		}
+	}
+	return ST_NCI_ATR_DEFAULT_BWI;
+}
+
+static void st_nci_se_get_atr(struct nci_dev *ndev)
+{
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+	int r;
+	struct sk_buff *skb;
+
+	r = nci_hci_get_param(ndev, ST_NCI_APDU_READER_GATE,
+				NCI_HCI_APDU_PARAM_ATR, &skb);
+	if (r < 0)
+		return;
+
+	if (skb->len <= ST_NCI_ESE_MAX_LENGTH) {
+		memcpy(info->se_info.atr, skb->data, skb->len);
+
+		info->se_info.wt_timeout =
+			ST_NCI_BWI_TO_TIMEOUT(st_nci_se_get_bwi(ndev));
+	}
+	kfree_skb(skb);
+}
+
+int st_nci_hci_load_session(struct nci_dev *ndev)
+{
+	int i, j, r;
+	struct sk_buff *skb_pipe_list, *skb_pipe_info;
+	struct st_nci_pipe_info *dm_pipe_info;
+	u8 pipe_list[] = { ST_NCI_DM_GETINFO_PIPE_LIST,
+			ST_NCI_TERMINAL_HOST_ID};
+	u8 pipe_info[] = { ST_NCI_DM_GETINFO_PIPE_INFO,
+			ST_NCI_TERMINAL_HOST_ID, 0};
+
+	/* On ST_NCI device pipes number are dynamics
+	 * If pipes are already created, hci_dev_up will fail.
+	 * Doing a clear all pipe is a bad idea because:
+	 * - It does useless EEPROM cycling
+	 * - It might cause issue for secure elements support
+	 * (such as removing connectivity or APDU reader pipe)
+	 * A better approach on ST_NCI is to:
+	 * - get a pipe list for each host.
+	 * (eg: ST_NCI_HOST_CONTROLLER_ID for now).
+	 * (TODO Later on UICC HOST and eSE HOST)
+	 * - get pipe information
+	 * - match retrieved pipe list in st_nci_gates
+	 * ST_NCI_DEVICE_MGNT_GATE is a proprietary gate
+	 * with ST_NCI_DEVICE_MGNT_PIPE.
+	 * Pipe can be closed and need to be open.
+	 */
+	r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
+				ST_NCI_DEVICE_MGNT_GATE,
+				ST_NCI_DEVICE_MGNT_PIPE);
+	if (r < 0)
+		goto free_info;
+
+	/* Get pipe list */
+	r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
+			ST_NCI_DM_GETINFO, pipe_list, sizeof(pipe_list),
+			&skb_pipe_list);
+	if (r < 0)
+		goto free_info;
+
+	/* Complete the existing gate_pipe table */
+	for (i = 0; i < skb_pipe_list->len; i++) {
+		pipe_info[2] = skb_pipe_list->data[i];
+		r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
+					ST_NCI_DM_GETINFO, pipe_info,
+					sizeof(pipe_info), &skb_pipe_info);
+
+		if (r)
+			continue;
+
+		/*
+		 * Match pipe ID and gate ID
+		 * Output format from ST21NFC_DM_GETINFO is:
+		 * - pipe state (1byte)
+		 * - source hid (1byte)
+		 * - source gid (1byte)
+		 * - destination hid (1byte)
+		 * - destination gid (1byte)
+		 */
+		dm_pipe_info = (struct st_nci_pipe_info *)skb_pipe_info->data;
+		if (dm_pipe_info->dst_gate_id == ST_NCI_APDU_READER_GATE &&
+		    dm_pipe_info->src_host_id != ST_NCI_ESE_HOST_ID) {
+			pr_err("Unexpected apdu_reader pipe on host %x\n",
+			       dm_pipe_info->src_host_id);
+			continue;
+		}
+
+		for (j = 0; (j < ARRAY_SIZE(st_nci_gates)) &&
+		     (st_nci_gates[j].gate != dm_pipe_info->dst_gate_id); j++)
+			;
+
+		if (j < ARRAY_SIZE(st_nci_gates) &&
+		    st_nci_gates[j].gate == dm_pipe_info->dst_gate_id &&
+		    ST_NCI_DM_IS_PIPE_OPEN(dm_pipe_info->pipe_state)) {
+			st_nci_gates[j].pipe = pipe_info[2];
+
+			ndev->hci_dev->gate2pipe[st_nci_gates[j].gate] =
+						st_nci_gates[j].pipe;
+			ndev->hci_dev->pipes[st_nci_gates[j].pipe].gate =
+						st_nci_gates[j].gate;
+			ndev->hci_dev->pipes[st_nci_gates[j].pipe].host =
+						dm_pipe_info->src_host_id;
+		}
+	}
+
+	memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
+	       sizeof(st_nci_gates));
+
+free_info:
+	kfree_skb(skb_pipe_info);
+	kfree_skb(skb_pipe_list);
+	return r;
+}
+EXPORT_SYMBOL_GPL(st_nci_hci_load_session);
+
+static void st_nci_hci_admin_event_received(struct nci_dev *ndev,
+					      u8 event, struct sk_buff *skb)
+{
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+
+	switch (event) {
+	case ST_NCI_EVT_HOT_PLUG:
+		if (info->se_info.se_active) {
+			if (!ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
+				del_timer_sync(&info->se_info.se_active_timer);
+				info->se_info.se_active = false;
+				complete(&info->se_info.req_completion);
+			} else {
+				mod_timer(&info->se_info.se_active_timer,
+				      jiffies +
+				      msecs_to_jiffies(ST_NCI_SE_TO_PIPES));
+			}
+		}
+	break;
+	}
+}
+
+static int st_nci_hci_apdu_reader_event_received(struct nci_dev *ndev,
+						   u8 event,
+						   struct sk_buff *skb)
+{
+	int r = 0;
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+
+	pr_debug("apdu reader gate event: %x\n", event);
+
+	switch (event) {
+	case ST_NCI_EVT_TRANSMIT_DATA:
+		del_timer_sync(&info->se_info.bwi_timer);
+		info->se_info.bwi_active = false;
+		info->se_info.cb(info->se_info.cb_context,
+				 skb->data, skb->len, 0);
+	break;
+	case ST_NCI_EVT_WTX_REQUEST:
+		mod_timer(&info->se_info.bwi_timer, jiffies +
+			  msecs_to_jiffies(info->se_info.wt_timeout));
+	break;
+	}
+
+	kfree_skb(skb);
+	return r;
+}
+
+/*
+ * Returns:
+ * <= 0: driver handled the event, skb consumed
+ *    1: driver does not handle the event, please do standard processing
+ */
+static int st_nci_hci_connectivity_event_received(struct nci_dev *ndev,
+						u8 host, u8 event,
+						struct sk_buff *skb)
+{
+	int r = 0;
+	struct device *dev = &ndev->nfc_dev->dev;
+	struct nfc_evt_transaction *transaction;
+
+	pr_debug("connectivity gate event: %x\n", event);
+
+	switch (event) {
+	case ST_NCI_EVT_CONNECTIVITY:
+
+	break;
+	case ST_NCI_EVT_TRANSACTION:
+		/* According to specification etsi 102 622
+		 * 11.2.2.4 EVT_TRANSACTION Table 52
+		 * Description  Tag     Length
+		 * AID          81      5 to 16
+		 * PARAMETERS   82      0 to 255
+		 */
+		if (skb->len < NFC_MIN_AID_LENGTH + 2 &&
+		    skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
+			return -EPROTO;
+
+		transaction = (struct nfc_evt_transaction *)devm_kzalloc(dev,
+					    skb->len - 2, GFP_KERNEL);
+
+		transaction->aid_len = skb->data[1];
+		memcpy(transaction->aid, &skb->data[2], transaction->aid_len);
+
+		/* Check next byte is PARAMETERS tag (82) */
+		if (skb->data[transaction->aid_len + 2] !=
+		    NFC_EVT_TRANSACTION_PARAMS_TAG)
+			return -EPROTO;
+
+		transaction->params_len = skb->data[transaction->aid_len + 3];
+		memcpy(transaction->params, skb->data +
+		       transaction->aid_len + 4, transaction->params_len);
+
+		r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
+		break;
+	default:
+		return 1;
+	}
+	kfree_skb(skb);
+	return r;
+}
+
+void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
+				 u8 event, struct sk_buff *skb)
+{
+	u8 gate = ndev->hci_dev->pipes[pipe].gate;
+	u8 host = ndev->hci_dev->pipes[pipe].host;
+
+	switch (gate) {
+	case NCI_HCI_ADMIN_GATE:
+		st_nci_hci_admin_event_received(ndev, event, skb);
+	break;
+	case ST_NCI_APDU_READER_GATE:
+		st_nci_hci_apdu_reader_event_received(ndev, event, skb);
+	break;
+	case ST_NCI_CONNECTIVITY_GATE:
+		st_nci_hci_connectivity_event_received(ndev, host, event,
+							 skb);
+	break;
+	}
+}
+EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
+
+
+void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
+			       struct sk_buff *skb)
+{
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+	u8 gate = ndev->hci_dev->pipes[pipe].gate;
+
+	pr_debug("cmd: %x\n", cmd);
+
+	switch (cmd) {
+	case NCI_HCI_ANY_OPEN_PIPE:
+		if (gate != ST_NCI_APDU_READER_GATE &&
+		    ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
+			ndev->hci_dev->count_pipes++;
+
+		if (ndev->hci_dev->count_pipes ==
+		    ndev->hci_dev->expected_pipes) {
+			del_timer_sync(&info->se_info.se_active_timer);
+			info->se_info.se_active = false;
+			ndev->hci_dev->count_pipes = 0;
+			complete(&info->se_info.req_completion);
+		}
+	break;
+	}
+}
+EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
+
+/*
+ * Remarks: On some early st_nci firmware, nci_nfcee_mode_set(0)
+ * is rejected
+ */
+static int st_nci_control_se(struct nci_dev *ndev, u8 se_idx,
+				   u8 state)
+{
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+	int r;
+	struct sk_buff *sk_host_list;
+	u8 host_id;
+
+	switch (se_idx) {
+	case ST_NCI_UICC_HOST_ID:
+		ndev->hci_dev->count_pipes = 0;
+		ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_UICC;
+		break;
+	case ST_NCI_ESE_HOST_ID:
+		ndev->hci_dev->count_pipes = 0;
+		ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_EMBEDDED;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/*
+	 * Wait for an EVT_HOT_PLUG in order to
+	 * retrieve a relevant host list.
+	 */
+	reinit_completion(&info->se_info.req_completion);
+	r = nci_nfcee_mode_set(ndev, se_idx, NCI_NFCEE_ENABLE);
+	if (r != NCI_STATUS_OK)
+		return r;
+
+	mod_timer(&info->se_info.se_active_timer, jiffies +
+		msecs_to_jiffies(ST_NCI_SE_TO_HOT_PLUG));
+	info->se_info.se_active = true;
+
+	/* Ignore return value and check in any case the host_list */
+	wait_for_completion_interruptible(&info->se_info.req_completion);
+
+	/* There might be some "collision" after receiving a HOT_PLUG event
+	 * This may cause the CLF to not answer to the next hci command.
+	 * There is no possible synchronization to prevent this.
+	 * Adding a small delay is the only way to solve the issue.
+	 */
+	usleep_range(3000, 5000);
+
+	r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
+			NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
+	if (r != NCI_HCI_ANY_OK)
+		return r;
+
+	host_id = sk_host_list->data[sk_host_list->len - 1];
+	kfree_skb(sk_host_list);
+	if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
+		return se_idx;
+	else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
+		return se_idx;
+
+	return -1;
+}
+
+int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
+{
+	int r;
+
+	pr_debug("st_nci_disable_se\n");
+
+	if (se_idx == NFC_SE_EMBEDDED) {
+		r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
+				ST_NCI_EVT_SE_END_OF_APDU_TRANSFER, NULL, 0);
+		if (r < 0)
+			return r;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(st_nci_disable_se);
+
+int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
+{
+	int r;
+
+	pr_debug("st_nci_enable_se\n");
+
+	if (se_idx == ST_NCI_HCI_HOST_ID_ESE) {
+		r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
+				ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
+		if (r < 0)
+			return r;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(st_nci_enable_se);
+
+static int st_nci_hci_network_init(struct nci_dev *ndev)
+{
+	struct core_conn_create_dest_spec_params *dest_params;
+	struct dest_spec_params spec_params;
+	struct nci_conn_info    *conn_info;
+	int r, dev_num;
+
+	dest_params =
+		kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
+			sizeof(struct dest_spec_params), GFP_KERNEL);
+	if (dest_params == NULL) {
+		r = -ENOMEM;
+		goto exit;
+	}
+
+	dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
+	dest_params->length = sizeof(struct dest_spec_params);
+	spec_params.id = ndev->hci_dev->nfcee_id;
+	spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
+	memcpy(dest_params->value, &spec_params,
+	       sizeof(struct dest_spec_params));
+	r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
+				 sizeof(struct core_conn_create_dest_spec_params) +
+				 sizeof(struct dest_spec_params),
+				 dest_params);
+	if (r != NCI_STATUS_OK)
+		goto free_dest_params;
+
+	conn_info = ndev->hci_dev->conn_info;
+	if (!conn_info)
+		goto free_dest_params;
+
+	memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
+	       sizeof(st_nci_gates));
+
+	/*
+	 * Session id must include the driver name + i2c bus addr
+	 * persistent info to discriminate 2 identical chips
+	 */
+	dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
+	if (dev_num >= ST_NCI_NUM_DEVICES) {
+		r = -ENODEV;
+		goto free_dest_params;
+	}
+
+	scnprintf(ndev->hci_dev->init_data.session_id,
+		  sizeof(ndev->hci_dev->init_data.session_id),
+		  "%s%2x", "ST21BH", dev_num);
+
+	r = nci_hci_dev_session_init(ndev);
+	if (r != NCI_HCI_ANY_OK)
+		goto free_dest_params;
+
+	r = nci_nfcee_mode_set(ndev, ndev->hci_dev->conn_info->id,
+			       NCI_NFCEE_ENABLE);
+	if (r != NCI_STATUS_OK)
+		goto free_dest_params;
+
+free_dest_params:
+	kfree(dest_params);
+
+exit:
+	return r;
+}
+
+int st_nci_discover_se(struct nci_dev *ndev)
+{
+	u8 param[2];
+	int r;
+	int se_count = 0;
+
+	pr_debug("st_nci_discover_se\n");
+
+	r = st_nci_hci_network_init(ndev);
+	if (r != 0)
+		return r;
+
+	param[0] = ST_NCI_UICC_HOST_ID;
+	param[1] = ST_NCI_HCI_HOST_ID_ESE;
+	r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
+				NCI_HCI_ADMIN_PARAM_WHITELIST,
+				param, sizeof(param));
+	if (r != NCI_HCI_ANY_OK)
+		return r;
+
+	r = st_nci_control_se(ndev, ST_NCI_UICC_HOST_ID,
+				ST_NCI_SE_MODE_ON);
+	if (r == ST_NCI_UICC_HOST_ID) {
+		nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
+		se_count++;
+	}
+
+	/* Try to enable eSE in order to check availability */
+	r = st_nci_control_se(ndev, ST_NCI_HCI_HOST_ID_ESE,
+				ST_NCI_SE_MODE_ON);
+	if (r == ST_NCI_HCI_HOST_ID_ESE) {
+		nfc_add_se(ndev->nfc_dev, ST_NCI_HCI_HOST_ID_ESE,
+			   NFC_SE_EMBEDDED);
+		se_count++;
+		st_nci_se_get_atr(ndev);
+	}
+
+	return !se_count;
+}
+EXPORT_SYMBOL_GPL(st_nci_discover_se);
+
+int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
+		       u8 *apdu, size_t apdu_length,
+		       se_io_cb_t cb, void *cb_context)
+{
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+
+	pr_debug("\n");
+
+	switch (se_idx) {
+	case ST_NCI_HCI_HOST_ID_ESE:
+		info->se_info.cb = cb;
+		info->se_info.cb_context = cb_context;
+		mod_timer(&info->se_info.bwi_timer, jiffies +
+			  msecs_to_jiffies(info->se_info.wt_timeout));
+		info->se_info.bwi_active = true;
+		return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
+					ST_NCI_EVT_TRANSMIT_DATA, apdu,
+					apdu_length);
+	default:
+		return -ENODEV;
+	}
+}
+EXPORT_SYMBOL(st_nci_se_io);
+
+static void st_nci_se_wt_timeout(unsigned long data)
+{
+	/*
+	 * No answer from the secure element
+	 * within the defined timeout.
+	 * Let's send a reset request as recovery procedure.
+	 * According to the situation, we first try to send a software reset
+	 * to the secure element. If the next command is still not
+	 * answering in time, we send to the CLF a secure element hardware
+	 * reset request.
+	 */
+	/* hardware reset managed through VCC_UICC_OUT power supply */
+	u8 param = 0x01;
+	struct st_nci_info *info = (struct st_nci_info *) data;
+
+	pr_debug("\n");
+
+	info->se_info.bwi_active = false;
+
+	if (!info->se_info.xch_error) {
+		info->se_info.xch_error = true;
+		nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
+				ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
+	} else {
+		info->se_info.xch_error = false;
+		nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
+				ST_NCI_EVT_SE_HARD_RESET, &param, 1);
+	}
+	info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
+}
+
+static void st_nci_se_activation_timeout(unsigned long data)
+{
+	struct st_nci_info *info = (struct st_nci_info *) data;
+
+	pr_debug("\n");
+
+	info->se_info.se_active = false;
+
+	complete(&info->se_info.req_completion);
+}
+
+int st_nci_se_init(struct nci_dev *ndev)
+{
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+
+	init_completion(&info->se_info.req_completion);
+	/* initialize timers */
+	init_timer(&info->se_info.bwi_timer);
+	info->se_info.bwi_timer.data = (unsigned long)info;
+	info->se_info.bwi_timer.function = st_nci_se_wt_timeout;
+	info->se_info.bwi_active = false;
+
+	init_timer(&info->se_info.se_active_timer);
+	info->se_info.se_active_timer.data = (unsigned long)info;
+	info->se_info.se_active_timer.function =
+			st_nci_se_activation_timeout;
+	info->se_info.se_active = false;
+
+	info->se_info.xch_error = false;
+
+	info->se_info.wt_timeout =
+		ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
+
+	return 0;
+}
+EXPORT_SYMBOL(st_nci_se_init);
+
+void st_nci_se_deinit(struct nci_dev *ndev)
+{
+	struct st_nci_info *info = nci_get_drvdata(ndev);
+
+	if (info->se_info.bwi_active)
+		del_timer_sync(&info->se_info.bwi_timer);
+	if (info->se_info.se_active)
+		del_timer_sync(&info->se_info.se_active_timer);
+
+	info->se_info.se_active = false;
+	info->se_info.bwi_active = false;
+}
+EXPORT_SYMBOL(st_nci_se_deinit);
+
diff --git a/drivers/nfc/st-nci/st-nci_se.h b/drivers/nfc/st-nci/st-nci_se.h
new file mode 100644
index 0000000..ea66e87
--- /dev/null
+++ b/drivers/nfc/st-nci/st-nci_se.h
@@ -0,0 +1,61 @@
+/*
+ * Secure Element Driver for STMicroelectronics NFC NCI Chip
+ *
+ * Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __LOCAL_ST_NCI_SE_H_
+#define __LOCAL_ST_NCI_SE_H_
+
+/*
+ * ref ISO7816-3 chap 8.1. the initial character TS is followed by a
+ * sequence of at most 32 characters.
+ */
+#define ST_NCI_ESE_MAX_LENGTH	33
+#define ST_NCI_HCI_HOST_ID_ESE	0xc0
+
+struct st_nci_se_info {
+	u8 atr[ST_NCI_ESE_MAX_LENGTH];
+	struct completion req_completion;
+
+	struct timer_list bwi_timer;
+	int wt_timeout; /* in msecs */
+	bool bwi_active;
+
+	struct timer_list se_active_timer;
+	bool se_active;
+
+	bool xch_error;
+
+	se_io_cb_t cb;
+	void *cb_context;
+};
+
+int st_nci_se_init(struct nci_dev *ndev);
+void st_nci_se_deinit(struct nci_dev *ndev);
+
+int st_nci_discover_se(struct nci_dev *ndev);
+int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx);
+int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx);
+int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
+		u8 *apdu, size_t apdu_length,
+		se_io_cb_t cb, void *cb_context);
+int st_nci_hci_load_session(struct nci_dev *ndev);
+void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
+			u8 event, struct sk_buff *skb);
+void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
+			struct sk_buff *skb);
+
+
+#endif /* __LOCAL_ST_NCI_SE_H_ */