14 files changed, 688 insertions, 27 deletions

diff --git a/net/nfc/af_nfc.c b/net/nfc/af_nfc.c
index 2277276f5..54e40fa47 100644
--- a/net/nfc/af_nfc.c
+++ b/net/nfc/af_nfc.c
@@ -40,7 +40,7 @@ static int nfc_sock_create(struct net *net, struct socket *sock, int proto,
 
 	read_lock(&proto_tab_lock);
 	if (proto_tab[proto] &&	try_module_get(proto_tab[proto]->owner)) {
-		rc = proto_tab[proto]->create(net, sock, proto_tab[proto]);
+		rc = proto_tab[proto]->create(net, sock, proto_tab[proto], kern);
 		module_put(proto_tab[proto]->owner);
 	}
 	read_unlock(&proto_tab_lock);
diff --git a/net/nfc/llcp.h b/net/nfc/llcp.h
index de1789e3c..1f68724d4 100644
--- a/net/nfc/llcp.h
+++ b/net/nfc/llcp.h
@@ -225,7 +225,7 @@ void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
 			       struct sk_buff *skb, u8 direction);
 
 /* Sock API */
-struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp);
+struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern);
 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock);
 void nfc_llcp_accept_unlink(struct sock *sk);
 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk);
diff --git a/net/nfc/llcp_core.c b/net/nfc/llcp_core.c
index b18f07ccb..98876274a 100644
--- a/net/nfc/llcp_core.c
+++ b/net/nfc/llcp_core.c
@@ -934,7 +934,7 @@ static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
 		sock->ssap = ssap;
 	}
 
-	new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
+	new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
 	if (new_sk == NULL) {
 		reason = LLCP_DM_REJ;
 		release_sock(&sock->sk);
diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index 9578bd6a4..b7de0da46 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c
@@ -942,12 +942,12 @@ static void llcp_sock_destruct(struct sock *sk)
 	}
 }
 
-struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
+struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern)
 {
 	struct sock *sk;
 	struct nfc_llcp_sock *llcp_sock;
 
-	sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
+	sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern);
 	if (!sk)
 		return NULL;
 
@@ -993,7 +993,7 @@ void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
 }
 
 static int llcp_sock_create(struct net *net, struct socket *sock,
-			    const struct nfc_protocol *nfc_proto)
+			    const struct nfc_protocol *nfc_proto, int kern)
 {
 	struct sock *sk;
 
@@ -1009,7 +1009,7 @@ static int llcp_sock_create(struct net *net, struct socket *sock,
 	else
 		sock->ops = &llcp_sock_ops;
 
-	sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
+	sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
 	if (sk == NULL)
 		return -ENOMEM;
 
diff --git a/net/nfc/nci/Kconfig b/net/nfc/nci/Kconfig
index a4f1e42e3..901c1ddba 100644
--- a/net/nfc/nci/Kconfig
+++ b/net/nfc/nci/Kconfig
@@ -19,3 +19,10 @@ config NFC_NCI_SPI
 	  an NFC Controller (NFCC) and a Device Host (DH).
 
 	  Say yes if you use an NCI driver that requires SPI link layer.
+
+config NFC_NCI_UART
+	depends on NFC_NCI && TTY
+	tristate "NCI over UART protocol support"
+	default n
+	help
+	  Say yes if you use an NCI driver that requires UART link layer.
diff --git a/net/nfc/nci/Makefile b/net/nfc/nci/Makefile
index 7ed894926..b4b85b82e 100644
--- a/net/nfc/nci/Makefile
+++ b/net/nfc/nci/Makefile
@@ -7,3 +7,6 @@ obj-$(CONFIG_NFC_NCI) += nci.o
 nci-objs := core.o data.o lib.o ntf.o rsp.o hci.o
 
 nci-$(CONFIG_NFC_NCI_SPI) += spi.o
+
+nci_uart-y += uart.o
+obj-$(CONFIG_NFC_NCI_UART) += nci_uart.o
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 49ff32106..95af2d24d 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -28,6 +28,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
 
 #include <linux/module.h>
+#include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/workqueue.h>
 #include <linux/completion.h>
@@ -73,6 +74,7 @@ void nci_req_complete(struct nci_dev *ndev, int result)
 		complete(&ndev->req_completion);
 	}
 }
+EXPORT_SYMBOL(nci_req_complete);
 
 static void nci_req_cancel(struct nci_dev *ndev, int err)
 {
@@ -323,6 +325,32 @@ static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
 		     sizeof(struct nci_rf_deactivate_cmd), &cmd);
 }
 
+struct nci_prop_cmd_param {
+	__u16 opcode;
+	size_t len;
+	__u8 *payload;
+};
+
+static void nci_prop_cmd_req(struct nci_dev *ndev, unsigned long opt)
+{
+	struct nci_prop_cmd_param *param = (struct nci_prop_cmd_param *)opt;
+
+	nci_send_cmd(ndev, param->opcode, param->len, param->payload);
+}
+
+int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, __u8 *payload)
+{
+	struct nci_prop_cmd_param param;
+
+	param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid);
+	param.len = len;
+	param.payload = payload;
+
+	return __nci_request(ndev, nci_prop_cmd_req, (unsigned long)&param,
+			     msecs_to_jiffies(NCI_CMD_TIMEOUT));
+}
+EXPORT_SYMBOL(nci_prop_cmd);
+
 static int nci_open_device(struct nci_dev *ndev)
 {
 	int rc = 0;
@@ -343,11 +371,17 @@ static int nci_open_device(struct nci_dev *ndev)
 
 	set_bit(NCI_INIT, &ndev->flags);
 
-	rc = __nci_request(ndev, nci_reset_req, 0,
-			   msecs_to_jiffies(NCI_RESET_TIMEOUT));
+	if (ndev->ops->init)
+		rc = ndev->ops->init(ndev);
 
-	if (ndev->ops->setup)
-		ndev->ops->setup(ndev);
+	if (!rc) {
+		rc = __nci_request(ndev, nci_reset_req, 0,
+				   msecs_to_jiffies(NCI_RESET_TIMEOUT));
+	}
+
+	if (!rc && ndev->ops->setup) {
+		rc = ndev->ops->setup(ndev);
+	}
 
 	if (!rc) {
 		rc = __nci_request(ndev, nci_init_req, 0,
@@ -407,6 +441,12 @@ static int nci_close_device(struct nci_dev *ndev)
 	set_bit(NCI_INIT, &ndev->flags);
 	__nci_request(ndev, nci_reset_req, 0,
 		      msecs_to_jiffies(NCI_RESET_TIMEOUT));
+
+	/* After this point our queues are empty
+	 * and no works are scheduled.
+	 */
+	ndev->ops->close(ndev);
+
 	clear_bit(NCI_INIT, &ndev->flags);
 
 	del_timer_sync(&ndev->cmd_timer);
@@ -414,10 +454,6 @@ static int nci_close_device(struct nci_dev *ndev)
 	/* Flush cmd wq */
 	flush_workqueue(ndev->cmd_wq);
 
-	/* After this point our queues are empty
-	 * and no works are scheduled. */
-	ndev->ops->close(ndev);
-
 	/* Clear flags */
 	ndev->flags = 0;
 
@@ -762,7 +798,7 @@ static void nci_deactivate_target(struct nfc_dev *nfc_dev,
 
 	if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
 		nci_request(ndev, nci_rf_deactivate_req,
-			    NCI_DEACTIVATE_TYPE_SLEEP_MODE,
+			    NCI_DEACTIVATE_TYPE_IDLE_MODE,
 			    msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
 	}
 }
@@ -961,6 +997,14 @@ struct nci_dev *nci_allocate_device(struct nci_ops *ops,
 		return NULL;
 
 	ndev->ops = ops;
+
+	if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) {
+		pr_err("Too many proprietary commands: %zd\n",
+		       ops->n_prop_ops);
+		ops->prop_ops = NULL;
+		ops->n_prop_ops = 0;
+	}
+
 	ndev->tx_headroom = tx_headroom;
 	ndev->tx_tailroom = tx_tailroom;
 	init_completion(&ndev->req_completion);
@@ -1165,6 +1209,49 @@ int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
 	return 0;
 }
 
+/* Proprietary commands API */
+static struct nci_prop_ops *prop_cmd_lookup(struct nci_dev *ndev,
+					    __u16 opcode)
+{
+	size_t i;
+	struct nci_prop_ops *prop_op;
+
+	if (!ndev->ops->prop_ops || !ndev->ops->n_prop_ops)
+		return NULL;
+
+	for (i = 0; i < ndev->ops->n_prop_ops; i++) {
+		prop_op = &ndev->ops->prop_ops[i];
+		if (prop_op->opcode == opcode)
+			return prop_op;
+	}
+
+	return NULL;
+}
+
+int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode,
+			struct sk_buff *skb)
+{
+	struct nci_prop_ops *prop_op;
+
+	prop_op = prop_cmd_lookup(ndev, rsp_opcode);
+	if (!prop_op || !prop_op->rsp)
+		return -ENOTSUPP;
+
+	return prop_op->rsp(ndev, skb);
+}
+
+int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode,
+			struct sk_buff *skb)
+{
+	struct nci_prop_ops *prop_op;
+
+	prop_op = prop_cmd_lookup(ndev, ntf_opcode);
+	if (!prop_op || !prop_op->ntf)
+		return -ENOTSUPP;
+
+	return prop_op->ntf(ndev, skb);
+}
+
 /* ---- NCI TX Data worker thread ---- */
 
 static void nci_tx_work(struct work_struct *work)
diff --git a/net/nfc/nci/hci.c b/net/nfc/nci/hci.c
index ed54ec533..af002df64 100644
--- a/net/nfc/nci/hci.c
+++ b/net/nfc/nci/hci.c
@@ -639,22 +639,19 @@ int nci_hci_dev_session_init(struct nci_dev *ndev)
 				 ndev->hci_dev->init_data.gates[0].gate,
 				 ndev->hci_dev->init_data.gates[0].pipe);
 	if (r < 0)
-		goto exit;
+		return r;
 
 	r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 			      NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
 	if (r < 0)
-		goto exit;
+		return r;
 
 	if (skb->len &&
 	    skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
-	    memcmp(ndev->hci_dev->init_data.session_id,
-		   skb->data, skb->len) == 0 &&
+	    !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
 	    ndev->ops->hci_load_session) {
 		/* Restore gate<->pipe table from some proprietary location. */
 		r = ndev->ops->hci_load_session(ndev);
-		if (r < 0)
-			goto exit;
 	} else {
 		r = nci_hci_dev_connect_gates(ndev,
 					      ndev->hci_dev->init_data.gate_count,
@@ -667,8 +664,6 @@ int nci_hci_dev_session_init(struct nci_dev *ndev)
 				      ndev->hci_dev->init_data.session_id,
 				      strlen(ndev->hci_dev->init_data.session_id));
 	}
-	if (r == 0)
-		goto exit;
 
 exit:
 	kfree_skb(skb);
diff --git a/net/nfc/nci/ntf.c b/net/nfc/nci/ntf.c
index 321807107..5d1c2e391 100644
--- a/net/nfc/nci/ntf.c
+++ b/net/nfc/nci/ntf.c
@@ -758,6 +758,15 @@ void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
 	/* strip the nci control header */
 	skb_pull(skb, NCI_CTRL_HDR_SIZE);
 
+	if (nci_opcode_gid(ntf_opcode) == NCI_GID_PROPRIETARY) {
+		if (nci_prop_ntf_packet(ndev, ntf_opcode, skb)) {
+			pr_err("unsupported ntf opcode 0x%x\n",
+			       ntf_opcode);
+		}
+
+		goto end;
+	}
+
 	switch (ntf_opcode) {
 	case NCI_OP_CORE_CONN_CREDITS_NTF:
 		nci_core_conn_credits_ntf_packet(ndev, skb);
@@ -796,5 +805,6 @@ void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
 		break;
 	}
 
+end:
 	kfree_skb(skb);
 }
diff --git a/net/nfc/nci/rsp.c b/net/nfc/nci/rsp.c
index 02486bc2c..408bd8f85 100644
--- a/net/nfc/nci/rsp.c
+++ b/net/nfc/nci/rsp.c
@@ -296,6 +296,15 @@ void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 	/* strip the nci control header */
 	skb_pull(skb, NCI_CTRL_HDR_SIZE);
 
+	if (nci_opcode_gid(rsp_opcode) == NCI_GID_PROPRIETARY) {
+		if (nci_prop_rsp_packet(ndev, rsp_opcode, skb) == -ENOTSUPP) {
+			pr_err("unsupported rsp opcode 0x%x\n",
+			       rsp_opcode);
+		}
+
+		goto end;
+	}
+
 	switch (rsp_opcode) {
 	case NCI_OP_CORE_RESET_RSP:
 		nci_core_reset_rsp_packet(ndev, skb);
@@ -346,6 +355,7 @@ void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 		break;
 	}
 
+end:
 	kfree_skb(skb);
 
 	/* trigger the next cmd */
diff --git a/net/nfc/nci/uart.c b/net/nfc/nci/uart.c
new file mode 100644
index 000000000..21d887567
--- /dev/null
+++ b/net/nfc/nci/uart.c
@@ -0,0 +1,494 @@
+/*
+ * Copyright (C) 2015, Marvell International Ltd.
+ *
+ * This software file (the "File") is distributed by Marvell International
+ * Ltd. under the terms of the GNU General Public License Version 2, June 1991
+ * (the "License").  You may use, redistribute and/or modify this File in
+ * accordance with the terms and conditions of the License, a copy of which
+ * is available on the worldwide web at
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
+ * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
+ * this warranty disclaimer.
+ */
+
+/* Inspired (hugely) by HCI LDISC implementation in Bluetooth.
+ *
+ *  Copyright (C) 2000-2001  Qualcomm Incorporated
+ *  Copyright (C) 2002-2003  Maxim Krasnyansky <maxk@qualcomm.com>
+ *  Copyright (C) 2004-2005  Marcel Holtmann <marcel@holtmann.org>
+ */
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/poll.h>
+
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/ioctl.h>
+#include <linux/skbuff.h>
+
+#include <net/nfc/nci.h>
+#include <net/nfc/nci_core.h>
+
+/* TX states  */
+#define NCI_UART_SENDING	1
+#define NCI_UART_TX_WAKEUP	2
+
+static struct nci_uart *nci_uart_drivers[NCI_UART_DRIVER_MAX];
+
+static inline struct sk_buff *nci_uart_dequeue(struct nci_uart *nu)
+{
+	struct sk_buff *skb = nu->tx_skb;
+
+	if (!skb)
+		skb = skb_dequeue(&nu->tx_q);
+	else
+		nu->tx_skb = NULL;
+
+	return skb;
+}
+
+static inline int nci_uart_queue_empty(struct nci_uart *nu)
+{
+	if (nu->tx_skb)
+		return 0;
+
+	return skb_queue_empty(&nu->tx_q);
+}
+
+static int nci_uart_tx_wakeup(struct nci_uart *nu)
+{
+	if (test_and_set_bit(NCI_UART_SENDING, &nu->tx_state)) {
+		set_bit(NCI_UART_TX_WAKEUP, &nu->tx_state);
+		return 0;
+	}
+
+	schedule_work(&nu->write_work);
+
+	return 0;
+}
+
+static void nci_uart_write_work(struct work_struct *work)
+{
+	struct nci_uart *nu = container_of(work, struct nci_uart, write_work);
+	struct tty_struct *tty = nu->tty;
+	struct sk_buff *skb;
+
+restart:
+	clear_bit(NCI_UART_TX_WAKEUP, &nu->tx_state);
+
+	if (nu->ops.tx_start)
+		nu->ops.tx_start(nu);
+
+	while ((skb = nci_uart_dequeue(nu))) {
+		int len;
+
+		set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+		len = tty->ops->write(tty, skb->data, skb->len);
+		skb_pull(skb, len);
+		if (skb->len) {
+			nu->tx_skb = skb;
+			break;
+		}
+		kfree_skb(skb);
+	}
+
+	if (test_bit(NCI_UART_TX_WAKEUP, &nu->tx_state))
+		goto restart;
+
+	if (nu->ops.tx_done && nci_uart_queue_empty(nu))
+		nu->ops.tx_done(nu);
+
+	clear_bit(NCI_UART_SENDING, &nu->tx_state);
+}
+
+static int nci_uart_set_driver(struct tty_struct *tty, unsigned int driver)
+{
+	struct nci_uart *nu = NULL;
+	int ret;
+
+	if (driver >= NCI_UART_DRIVER_MAX)
+		return -EINVAL;
+
+	if (!nci_uart_drivers[driver])
+		return -ENOENT;
+
+	nu = kzalloc(sizeof(*nu), GFP_KERNEL);
+	if (!nu)
+		return -ENOMEM;
+
+	memcpy(nu, nci_uart_drivers[driver], sizeof(struct nci_uart));
+	nu->tty = tty;
+	tty->disc_data = nu;
+	skb_queue_head_init(&nu->tx_q);
+	INIT_WORK(&nu->write_work, nci_uart_write_work);
+	spin_lock_init(&nu->rx_lock);
+
+	ret = nu->ops.open(nu);
+	if (ret) {
+		tty->disc_data = NULL;
+		kfree(nu);
+	} else if (!try_module_get(nu->owner)) {
+		nu->ops.close(nu);
+		tty->disc_data = NULL;
+		kfree(nu);
+		return -ENOENT;
+	}
+	return ret;
+}
+
+/* ------ LDISC part ------ */
+
+/* nci_uart_tty_open
+ *
+ *     Called when line discipline changed to NCI_UART.
+ *
+ * Arguments:
+ *     tty    pointer to tty info structure
+ * Return Value:
+ *     0 if success, otherwise error code
+ */
+static int nci_uart_tty_open(struct tty_struct *tty)
+{
+	/* Error if the tty has no write op instead of leaving an exploitable
+	 * hole
+	 */
+	if (!tty->ops->write)
+		return -EOPNOTSUPP;
+
+	tty->disc_data = NULL;
+	tty->receive_room = 65536;
+
+	/* Flush any pending characters in the driver and line discipline. */
+
+	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
+	 * open path is before the ldisc is referencable.
+	 */
+
+	if (tty->ldisc->ops->flush_buffer)
+		tty->ldisc->ops->flush_buffer(tty);
+	tty_driver_flush_buffer(tty);
+
+	return 0;
+}
+
+/* nci_uart_tty_close()
+ *
+ *    Called when the line discipline is changed to something
+ *    else, the tty is closed, or the tty detects a hangup.
+ */
+static void nci_uart_tty_close(struct tty_struct *tty)
+{
+	struct nci_uart *nu = (void *)tty->disc_data;
+
+	/* Detach from the tty */
+	tty->disc_data = NULL;
+
+	if (!nu)
+		return;
+
+	if (nu->tx_skb)
+		kfree_skb(nu->tx_skb);
+	if (nu->rx_skb)
+		kfree_skb(nu->rx_skb);
+
+	skb_queue_purge(&nu->tx_q);
+
+	nu->ops.close(nu);
+	nu->tty = NULL;
+	module_put(nu->owner);
+
+	cancel_work_sync(&nu->write_work);
+
+	kfree(nu);
+}
+
+/* nci_uart_tty_wakeup()
+ *
+ *    Callback for transmit wakeup. Called when low level
+ *    device driver can accept more send data.
+ *
+ * Arguments:        tty    pointer to associated tty instance data
+ * Return Value:    None
+ */
+static void nci_uart_tty_wakeup(struct tty_struct *tty)
+{
+	struct nci_uart *nu = (void *)tty->disc_data;
+
+	if (!nu)
+		return;
+
+	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+
+	if (tty != nu->tty)
+		return;
+
+	nci_uart_tx_wakeup(nu);
+}
+
+/* nci_uart_tty_receive()
+ *
+ *     Called by tty low level driver when receive data is
+ *     available.
+ *
+ * Arguments:  tty          pointer to tty isntance data
+ *             data         pointer to received data
+ *             flags        pointer to flags for data
+ *             count        count of received data in bytes
+ *
+ * Return Value:    None
+ */
+static void nci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
+				 char *flags, int count)
+{
+	struct nci_uart *nu = (void *)tty->disc_data;
+
+	if (!nu || tty != nu->tty)
+		return;
+
+	spin_lock(&nu->rx_lock);
+	nu->ops.recv_buf(nu, (void *)data, flags, count);
+	spin_unlock(&nu->rx_lock);
+
+	tty_unthrottle(tty);
+}
+
+/* nci_uart_tty_ioctl()
+ *
+ *    Process IOCTL system call for the tty device.
+ *
+ * Arguments:
+ *
+ *    tty        pointer to tty instance data
+ *    file       pointer to open file object for device
+ *    cmd        IOCTL command code
+ *    arg        argument for IOCTL call (cmd dependent)
+ *
+ * Return Value:    Command dependent
+ */
+static int nci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
+			      unsigned int cmd, unsigned long arg)
+{
+	struct nci_uart *nu = (void *)tty->disc_data;
+	int err = 0;
+
+	switch (cmd) {
+	case NCIUARTSETDRIVER:
+		if (!nu)
+			return nci_uart_set_driver(tty, (unsigned int)arg);
+		else
+			return -EBUSY;
+		break;
+	default:
+		err = n_tty_ioctl_helper(tty, file, cmd, arg);
+		break;
+	}
+
+	return err;
+}
+
+/* We don't provide read/write/poll interface for user space. */
+static ssize_t nci_uart_tty_read(struct tty_struct *tty, struct file *file,
+				 unsigned char __user *buf, size_t nr)
+{
+	return 0;
+}
+
+static ssize_t nci_uart_tty_write(struct tty_struct *tty, struct file *file,
+				  const unsigned char *data, size_t count)
+{
+	return 0;
+}
+
+static unsigned int nci_uart_tty_poll(struct tty_struct *tty,
+				      struct file *filp, poll_table *wait)
+{
+	return 0;
+}
+
+static int nci_uart_send(struct nci_uart *nu, struct sk_buff *skb)
+{
+	/* Queue TX packet */
+	skb_queue_tail(&nu->tx_q, skb);
+
+	/* Try to start TX (if possible) */
+	nci_uart_tx_wakeup(nu);
+
+	return 0;
+}
+
+/* -- Default recv_buf handler --
+ *
+ * This handler supposes that NCI frames are sent over UART link without any
+ * framing. It reads NCI header, retrieve the packet size and once all packet
+ * bytes are received it passes it to nci_uart driver for processing.
+ */
+static int nci_uart_default_recv_buf(struct nci_uart *nu, const u8 *data,
+				     char *flags, int count)
+{
+	int chunk_len;
+
+	if (!nu->ndev) {
+		nfc_err(nu->tty->dev,
+			"receive data from tty but no NCI dev is attached yet, drop buffer\n");
+		return 0;
+	}
+
+	/* Decode all incoming data in packets
+	 * and enqueue then for processing.
+	 */
+	while (count > 0) {
+		/* If this is the first data of a packet, allocate a buffer */
+		if (!nu->rx_skb) {
+			nu->rx_packet_len = -1;
+			nu->rx_skb = nci_skb_alloc(nu->ndev,
+						   NCI_MAX_PACKET_SIZE,
+						   GFP_KERNEL);
+			if (!nu->rx_skb)
+				return -ENOMEM;
+		}
+
+		/* Eat byte after byte till full packet header is received */
+		if (nu->rx_skb->len < NCI_CTRL_HDR_SIZE) {
+			*skb_put(nu->rx_skb, 1) = *data++;
+			--count;
+			continue;
+		}
+
+		/* Header was received but packet len was not read */
+		if (nu->rx_packet_len < 0)
+			nu->rx_packet_len = NCI_CTRL_HDR_SIZE +
+				nci_plen(nu->rx_skb->data);
+
+		/* Compute how many bytes are missing and how many bytes can
+		 * be consumed.
+		 */
+		chunk_len = nu->rx_packet_len - nu->rx_skb->len;
+		if (count < chunk_len)
+			chunk_len = count;
+		memcpy(skb_put(nu->rx_skb, chunk_len), data, chunk_len);
+		data += chunk_len;
+		count -= chunk_len;
+
+		/* Chcek if packet is fully received */
+		if (nu->rx_packet_len == nu->rx_skb->len) {
+			/* Pass RX packet to driver */
+			if (nu->ops.recv(nu, nu->rx_skb) != 0)
+				nfc_err(nu->tty->dev, "corrupted RX packet\n");
+			/* Next packet will be a new one */
+			nu->rx_skb = NULL;
+		}
+	}
+
+	return 0;
+}
+
+/* -- Default recv handler -- */
+static int nci_uart_default_recv(struct nci_uart *nu, struct sk_buff *skb)
+{
+	return nci_recv_frame(nu->ndev, skb);
+}
+
+int nci_uart_register(struct nci_uart *nu)
+{
+	if (!nu || !nu->ops.open ||
+	    !nu->ops.recv || !nu->ops.close)
+		return -EINVAL;
+
+	/* Set the send callback */
+	nu->ops.send = nci_uart_send;
+
+	/* Install default handlers if not overridden */
+	if (!nu->ops.recv_buf)
+		nu->ops.recv_buf = nci_uart_default_recv_buf;
+	if (!nu->ops.recv)
+		nu->ops.recv = nci_uart_default_recv;
+
+	/* Add this driver in the driver list */
+	if (nci_uart_drivers[nu->driver]) {
+		pr_err("driver %d is already registered\n", nu->driver);
+		return -EBUSY;
+	}
+	nci_uart_drivers[nu->driver] = nu;
+
+	pr_info("NCI uart driver '%s [%d]' registered\n", nu->name, nu->driver);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nci_uart_register);
+
+void nci_uart_unregister(struct nci_uart *nu)
+{
+	pr_info("NCI uart driver '%s [%d]' unregistered\n", nu->name,
+		nu->driver);
+
+	/* Remove this driver from the driver list */
+	nci_uart_drivers[nu->driver] = NULL;
+}
+EXPORT_SYMBOL_GPL(nci_uart_unregister);
+
+void nci_uart_set_config(struct nci_uart *nu, int baudrate, int flow_ctrl)
+{
+	struct ktermios new_termios;
+
+	if (!nu->tty)
+		return;
+
+	down_read(&nu->tty->termios_rwsem);
+	new_termios = nu->tty->termios;
+	up_read(&nu->tty->termios_rwsem);
+	tty_termios_encode_baud_rate(&new_termios, baudrate, baudrate);
+
+	if (flow_ctrl)
+		new_termios.c_cflag |= CRTSCTS;
+	else
+		new_termios.c_cflag &= ~CRTSCTS;
+
+	tty_set_termios(nu->tty, &new_termios);
+}
+EXPORT_SYMBOL_GPL(nci_uart_set_config);
+
+static struct tty_ldisc_ops nci_uart_ldisc = {
+	.magic		= TTY_LDISC_MAGIC,
+	.owner		= THIS_MODULE,
+	.name		= "n_nci",
+	.open		= nci_uart_tty_open,
+	.close		= nci_uart_tty_close,
+	.read		= nci_uart_tty_read,
+	.write		= nci_uart_tty_write,
+	.poll		= nci_uart_tty_poll,
+	.receive_buf	= nci_uart_tty_receive,
+	.write_wakeup	= nci_uart_tty_wakeup,
+	.ioctl		= nci_uart_tty_ioctl,
+};
+
+static int __init nci_uart_init(void)
+{
+	memset(nci_uart_drivers, 0, sizeof(nci_uart_drivers));
+	return tty_register_ldisc(N_NCI, &nci_uart_ldisc);
+}
+
+static void __exit nci_uart_exit(void)
+{
+	tty_unregister_ldisc(N_NCI);
+}
+
+module_init(nci_uart_init);
+module_exit(nci_uart_exit);
+
+MODULE_AUTHOR("Marvell International Ltd.");
+MODULE_DESCRIPTION("NFC NCI UART driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_LDISC(N_NCI);
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 376303671..f85f37ed1 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -5,6 +5,12 @@
  *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
  *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
  *
+ * Vendor commands implementation based on net/wireless/nl80211.c
+ * which is:
+ *
+ * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2013-2014  Intel Mobile Communications GmbH
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
@@ -1489,6 +1495,50 @@ static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
 	return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
 }
 
+static int nfc_genl_vendor_cmd(struct sk_buff *skb,
+			       struct genl_info *info)
+{
+	struct nfc_dev *dev;
+	struct nfc_vendor_cmd *cmd;
+	u32 dev_idx, vid, subcmd;
+	u8 *data;
+	size_t data_len;
+	int i;
+
+	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
+	    !info->attrs[NFC_ATTR_VENDOR_ID] ||
+	    !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
+		return -EINVAL;
+
+	dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
+	vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
+	subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
+
+	dev = nfc_get_device(dev_idx);
+	if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
+		return -ENODEV;
+
+	data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
+	if (data) {
+		data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
+		if (data_len == 0)
+			return -EINVAL;
+	} else {
+		data_len = 0;
+	}
+
+	for (i = 0; i < dev->n_vendor_cmds; i++) {
+		cmd = &dev->vendor_cmds[i];
+
+		if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
+			continue;
+
+		return cmd->doit(dev, data, data_len);
+	}
+
+	return -EOPNOTSUPP;
+}
+
 static const struct genl_ops nfc_genl_ops[] = {
 	{
 		.cmd = NFC_CMD_GET_DEVICE,
@@ -1579,6 +1629,11 @@ static const struct genl_ops nfc_genl_ops[] = {
 		.doit = nfc_genl_activate_target,
 		.policy = nfc_genl_policy,
 	},
+	{
+		.cmd = NFC_CMD_VENDOR,
+		.doit = nfc_genl_vendor_cmd,
+		.policy = nfc_genl_policy,
+	},
 };
 
 
diff --git a/net/nfc/nfc.h b/net/nfc/nfc.h
index a8ce80b47..5c93e8412 100644
--- a/net/nfc/nfc.h
+++ b/net/nfc/nfc.h
@@ -30,7 +30,7 @@ struct nfc_protocol {
 	struct proto *proto;
 	struct module *owner;
 	int (*create)(struct net *net, struct socket *sock,
-		      const struct nfc_protocol *nfc_proto);
+		      const struct nfc_protocol *nfc_proto, int kern);
 };
 
 struct nfc_rawsock {
diff --git a/net/nfc/rawsock.c b/net/nfc/rawsock.c
index 82b4e8024..e9a91488f 100644
--- a/net/nfc/rawsock.c
+++ b/net/nfc/rawsock.c
@@ -334,7 +334,7 @@ static void rawsock_destruct(struct sock *sk)
 }
 
 static int rawsock_create(struct net *net, struct socket *sock,
-			  const struct nfc_protocol *nfc_proto)
+			  const struct nfc_protocol *nfc_proto, int kern)
 {
 	struct sock *sk;
 
@@ -348,7 +348,7 @@ static int rawsock_create(struct net *net, struct socket *sock,
 	else
 		sock->ops = &rawsock_ops;
 
-	sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto);
+	sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto, kern);
 	if (!sk)
 		return -ENOMEM;