Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking update from David Miller:

 1) Checkpoint/restarted TCP sockets now can properly propagate the TCP
    timestamp offset.  From Andrey Vagin.

 2) VMWARE VM VSOCK layer, from Andy King.

 3) Much improved support for virtual functions and SR-IOV in bnx2x,
    from Ariel ELior.

 4) All protocols on ipv4 and ipv6 are now network namespace aware, and
    all the compatability checks for initial-namespace-only protocols is
    removed.  Thanks to Tom Parkin for helping deal with the last major
    holdout, L2TP.

 5) IPV6 support in netpoll and network namespace support in pktgen,
    from Cong Wang.

 6) Multiple Registration Protocol (MRP) and Multiple VLAN Registration
    Protocol (MVRP) support, from David Ward.

 7) Compute packet lengths more accurately in the packet scheduler, from
    Eric Dumazet.

 8) Use per-task page fragment allocator in skb_append_datato_frags(),
    also from Eric Dumazet.

 9) Add support for connection tracking labels in netfilter, from
    Florian Westphal.

10) Fix default multicast group joining on ipv6, and add anti-spoofing
    checks to 6to4 and 6rd.  From Hannes Frederic Sowa.

11) Make ipv4/ipv6 fragmentation memory limits more reasonable in modern
    times, rearrange inet frag datastructures for better cacheline
    locality, and move more operations outside of locking.  From Jesper
    Dangaard Brouer.

12) Instead of strict master <--> slave relationships, allow arbitrary
    scenerios with "upper device lists".  From Jiri Pirko.

13) Improve rate limiting accuracy in TBF and act_police, also from Jiri
    Pirko.

14) Add a BPF filter netfilter match target, from Willem de Bruijn.

15) Orphan and delete a bunch of pre-historic networking drivers from
    Paul Gortmaker.

16) Add TSO support for GRE tunnels, from Pravin B SHelar.  Although
    this still needs some minor bug fixing before it's %100 correct in
    all cases.

17) Handle unresolved IPSEC states like ARP, with a resolution packet
    queue.  From Steffen Klassert.

18) Remove TCP Appropriate Byte Count support (ABC), from Stephen
    Hemminger.  This was long overdue.

19) Support SO_REUSEPORT, from Tom Herbert.

20) Allow locking a socket BPF filter, so that it cannot change after a
    process drops capabilities.

21) Add VLAN filtering to bridge, from Vlad Yasevich.

22) Bring ipv6 on-par with ipv4 and do not cache neighbour entries in
    the ipv6 routes, from YOSHIFUJI Hideaki.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1538 commits)
  ipv6: fix race condition regarding dst->expires and dst->from.
  net: fix a wrong assignment in skb_split()
  ip_gre: remove an extra dst_release()
  ppp: set qdisc_tx_busylock to avoid LOCKDEP splat
  atl1c: restore buffer state
  net: fix a build failure when !CONFIG_PROC_FS
  net: ipv4: fix waring -Wunused-variable
  net: proc: fix build failed when procfs is not configured
  Revert "xen: netback: remove redundant xenvif_put"
  net: move procfs code to net/core/net-procfs.c
  qmi_wwan, cdc-ether: add ADU960S
  bonding: set sysfs device_type to 'bond'
  bonding: fix bond_release_all inconsistencies
  b44: use netdev_alloc_skb_ip_align()
  xen: netback: remove redundant xenvif_put
  net: fec: Do a sanity check on the gpio number
  ip_gre: propogate target device GSO capability to the tunnel device
  ip_gre: allow CSUM capable devices to handle packets
  bonding: Fix initialize after use for 3ad machine state spinlock
  bonding: Fix race condition between bond_enslave() and bond_3ad_update_lacp_rate()
  ...

1 files changed, 340 insertions, 0 deletions

diff --git a/drivers/nfc/microread/i2c.c b/drivers/nfc/microread/i2c.c
new file mode 100644
index 000000000000..101089495bf8
--- /dev/null
+++ b/drivers/nfc/microread/i2c.c
@@ -0,0 +1,340 @@
+/*
+ * HCI based Driver for Inside Secure microread NFC Chip - i2c layer
+ *
+ * Copyright (C) 2013 Intel Corporation. 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, write to the
+ * Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+
+#include <linux/nfc.h>
+#include <net/nfc/hci.h>
+#include <net/nfc/llc.h>
+
+#include "microread.h"
+
+#define MICROREAD_I2C_DRIVER_NAME "microread"
+
+#define MICROREAD_I2C_FRAME_HEADROOM 1
+#define MICROREAD_I2C_FRAME_TAILROOM 1
+
+/* framing in HCI mode */
+#define MICROREAD_I2C_LLC_LEN		1
+#define MICROREAD_I2C_LLC_CRC		1
+#define MICROREAD_I2C_LLC_LEN_CRC	(MICROREAD_I2C_LLC_LEN + \
+					MICROREAD_I2C_LLC_CRC)
+#define MICROREAD_I2C_LLC_MIN_SIZE	(1 + MICROREAD_I2C_LLC_LEN_CRC)
+#define MICROREAD_I2C_LLC_MAX_PAYLOAD	29
+#define MICROREAD_I2C_LLC_MAX_SIZE	(MICROREAD_I2C_LLC_LEN_CRC + 1 + \
+					MICROREAD_I2C_LLC_MAX_PAYLOAD)
+
+struct microread_i2c_phy {
+	struct i2c_client *i2c_dev;
+	struct nfc_hci_dev *hdev;
+
+	int irq;
+
+	int hard_fault;		/*
+				 * < 0 if hardware error occured (e.g. i2c err)
+				 * and prevents normal operation.
+				 */
+};
+
+#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 void microread_i2c_add_len_crc(struct sk_buff *skb)
+{
+	int i;
+	u8 crc = 0;
+	int len;
+
+	len = skb->len;
+	*skb_push(skb, 1) = len;
+
+	for (i = 0; i < skb->len; i++)
+		crc = crc ^ skb->data[i];
+
+	*skb_put(skb, 1) = crc;
+}
+
+static void microread_i2c_remove_len_crc(struct sk_buff *skb)
+{
+	skb_pull(skb, MICROREAD_I2C_FRAME_HEADROOM);
+	skb_trim(skb, MICROREAD_I2C_FRAME_TAILROOM);
+}
+
+static int check_crc(struct sk_buff *skb)
+{
+	int i;
+	u8 crc = 0;
+
+	for (i = 0; i < skb->len - 1; i++)
+		crc = crc ^ skb->data[i];
+
+	if (crc != skb->data[skb->len-1]) {
+		pr_err(MICROREAD_I2C_DRIVER_NAME
+		       ": CRC error 0x%x != 0x%x\n",
+		       crc, skb->data[skb->len-1]);
+
+		pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
+
+		return -EPERM;
+	}
+
+	return 0;
+}
+
+static int microread_i2c_enable(void *phy_id)
+{
+	return 0;
+}
+
+static void microread_i2c_disable(void *phy_id)
+{
+	return;
+}
+
+static int microread_i2c_write(void *phy_id, struct sk_buff *skb)
+{
+	int r;
+	struct microread_i2c_phy *phy = phy_id;
+	struct i2c_client *client = phy->i2c_dev;
+
+	if (phy->hard_fault != 0)
+		return phy->hard_fault;
+
+	usleep_range(3000, 6000);
+
+	microread_i2c_add_len_crc(skb);
+
+	I2C_DUMP_SKB("i2c frame written", skb);
+
+	r = i2c_master_send(client, skb->data, skb->len);
+
+	if (r == -EREMOTEIO) {	/* Retry, chip was in standby */
+		usleep_range(6000, 10000);
+		r = i2c_master_send(client, skb->data, skb->len);
+	}
+
+	if (r >= 0) {
+		if (r != skb->len)
+			r = -EREMOTEIO;
+		else
+			r = 0;
+	}
+
+	microread_i2c_remove_len_crc(skb);
+
+	return r;
+}
+
+
+static int microread_i2c_read(struct microread_i2c_phy *phy,
+			      struct sk_buff **skb)
+{
+	int r;
+	u8 len;
+	u8 tmp[MICROREAD_I2C_LLC_MAX_SIZE - 1];
+	struct i2c_client *client = phy->i2c_dev;
+
+	pr_debug("%s\n", __func__);
+
+	r = i2c_master_recv(client, &len, 1);
+	if (r != 1) {
+		dev_err(&client->dev, "cannot read len byte\n");
+		return -EREMOTEIO;
+	}
+
+	if ((len < MICROREAD_I2C_LLC_MIN_SIZE) ||
+	    (len > MICROREAD_I2C_LLC_MAX_SIZE)) {
+		dev_err(&client->dev, "invalid len byte\n");
+		pr_err("invalid len byte\n");
+		r = -EBADMSG;
+		goto flush;
+	}
+
+	*skb = alloc_skb(1 + len, GFP_KERNEL);
+	if (*skb == NULL) {
+		r = -ENOMEM;
+		goto flush;
+	}
+
+	*skb_put(*skb, 1) = len;
+
+	r = i2c_master_recv(client, skb_put(*skb, len), len);
+	if (r != len) {
+		kfree_skb(*skb);
+		return -EREMOTEIO;
+	}
+
+	I2C_DUMP_SKB("cc frame read", *skb);
+
+	r = check_crc(*skb);
+	if (r != 0) {
+		kfree_skb(*skb);
+		r = -EBADMSG;
+		goto flush;
+	}
+
+	skb_pull(*skb, 1);
+	skb_trim(*skb, (*skb)->len - MICROREAD_I2C_FRAME_TAILROOM);
+
+	usleep_range(3000, 6000);
+
+	return 0;
+
+flush:
+	if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
+		r = -EREMOTEIO;
+
+	usleep_range(3000, 6000);
+
+	return r;
+}
+
+static irqreturn_t microread_i2c_irq_thread_fn(int irq, void *phy_id)
+{
+	struct microread_i2c_phy *phy = phy_id;
+	struct i2c_client *client;
+	struct sk_buff *skb = NULL;
+	int r;
+
+	if (!phy || irq != phy->i2c_dev->irq) {
+		WARN_ON_ONCE(1);
+		return IRQ_NONE;
+	}
+
+	client = phy->i2c_dev;
+	dev_dbg(&client->dev, "IRQ\n");
+
+	if (phy->hard_fault != 0)
+		return IRQ_HANDLED;
+
+	r = microread_i2c_read(phy, &skb);
+	if (r == -EREMOTEIO) {
+		phy->hard_fault = r;
+
+		nfc_hci_recv_frame(phy->hdev, NULL);
+
+		return IRQ_HANDLED;
+	} else if ((r == -ENOMEM) || (r == -EBADMSG)) {
+		return IRQ_HANDLED;
+	}
+
+	nfc_hci_recv_frame(phy->hdev, skb);
+
+	return IRQ_HANDLED;
+}
+
+static struct nfc_phy_ops i2c_phy_ops = {
+	.write = microread_i2c_write,
+	.enable = microread_i2c_enable,
+	.disable = microread_i2c_disable,
+};
+
+static int microread_i2c_probe(struct i2c_client *client,
+			       const struct i2c_device_id *id)
+{
+	struct microread_i2c_phy *phy;
+	struct microread_nfc_platform_data *pdata =
+		dev_get_platdata(&client->dev);
+	int r;
+
+	dev_dbg(&client->dev, "client %p", client);
+
+	if (!pdata) {
+		dev_err(&client->dev, "client %p: missing platform data",
+			client);
+		return -EINVAL;
+	}
+
+	phy = devm_kzalloc(&client->dev, sizeof(struct microread_i2c_phy),
+			   GFP_KERNEL);
+	if (!phy) {
+		dev_err(&client->dev, "Can't allocate microread phy");
+		return -ENOMEM;
+	}
+
+	i2c_set_clientdata(client, phy);
+	phy->i2c_dev = client;
+
+	r = request_threaded_irq(client->irq, NULL, microread_i2c_irq_thread_fn,
+				 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+				 MICROREAD_I2C_DRIVER_NAME, phy);
+	if (r) {
+		dev_err(&client->dev, "Unable to register IRQ handler");
+		return r;
+	}
+
+	r = microread_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME,
+			    MICROREAD_I2C_FRAME_HEADROOM,
+			    MICROREAD_I2C_FRAME_TAILROOM,
+			    MICROREAD_I2C_LLC_MAX_PAYLOAD, &phy->hdev);
+	if (r < 0)
+		goto err_irq;
+
+	dev_info(&client->dev, "Probed");
+
+	return 0;
+
+err_irq:
+	free_irq(client->irq, phy);
+
+	return r;
+}
+
+static int microread_i2c_remove(struct i2c_client *client)
+{
+	struct microread_i2c_phy *phy = i2c_get_clientdata(client);
+
+	dev_dbg(&client->dev, "%s\n", __func__);
+
+	microread_remove(phy->hdev);
+
+	free_irq(client->irq, phy);
+
+	return 0;
+}
+
+static struct i2c_device_id microread_i2c_id[] = {
+	{ MICROREAD_I2C_DRIVER_NAME, 0},
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, microread_i2c_id);
+
+static struct i2c_driver microread_i2c_driver = {
+	.driver = {
+		.name = MICROREAD_I2C_DRIVER_NAME,
+	},
+	.probe		= microread_i2c_probe,
+	.remove		= microread_i2c_remove,
+	.id_table	= microread_i2c_id,
+};
+
+module_i2c_driver(microread_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);