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

Pull networking updates from David Miller:

 1) Add TX fast path in mac80211, from Johannes Berg.

 2) Add TSO/GRO support to ibmveth, from Thomas Falcon

 3) Move away from cached routes in ipv6, just like ipv4, from Martin
    KaFai Lau.

 4) Lots of new rhashtable tests, from Thomas Graf.

 5) Run ingress qdisc lockless, from Alexei Starovoitov.

 6) Allow servers to fetch TCP packet headers for SYN packets of new
    connections, for fingerprinting.  From Eric Dumazet.

 7) Add mode parameter to pktgen, for testing receive.  From Alexei
    Starovoitov.

 8) Cache access optimizations via simplifications of build_skb(), from
    Alexander Duyck.

 9) Move page frag allocator under mm/, also from Alexander.

10) Add xmit_more support to hv_netvsc, from KY Srinivasan.

11) Add a counter guard in case we try to perform endless reclassify
    loops in the packet scheduler.

12) Extern flow dissector to be programmable and use it in new "Flower"
    classifier.  From Jiri Pirko.

13) AF_PACKET fanout rollover fixes, performance improvements, and new
    statistics.  From Willem de Bruijn.

14) Add netdev driver for GENEVE tunnels, from John W Linville.

15) Add ingress netfilter hooks and filtering, from Pablo Neira Ayuso.

16) Fix handling of epoll edge triggers in TCP, from Eric Dumazet.

17) Add an ECN retry fallback for the initial TCP handshake, from Daniel
    Borkmann.

18) Add tail call support to BPF, from Alexei Starovoitov.

19) Add several pktgen helper scripts, from Jesper Dangaard Brouer.

20) Add zerocopy support to AF_UNIX, from Hannes Frederic Sowa.

21) Favor even port numbers for allocation to connect() requests, and
    odd port numbers for bind(0), in an effort to help avoid
    ip_local_port_range exhaustion.  From Eric Dumazet.

22) Add Cavium ThunderX driver, from Sunil Goutham.

23) Allow bpf programs to access skb_iif and dev->ifindex SKB metadata,
    from Alexei Starovoitov.

24) Add support for T6 chips in cxgb4vf driver, from Hariprasad Shenai.

25) Double TCP Small Queues default to 256K to accomodate situations
    like the XEN driver and wireless aggregation.  From Wei Liu.

26) Add more entropy inputs to flow dissector, from Tom Herbert.

27) Add CDG congestion control algorithm to TCP, from Kenneth Klette
    Jonassen.

28) Convert ipset over to RCU locking, from Jozsef Kadlecsik.

29) Track and act upon link status of ipv4 route nexthops, from Andy
    Gospodarek.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1670 commits)
  bridge: vlan: flush the dynamically learned entries on port vlan delete
  bridge: multicast: add a comment to br_port_state_selection about blocking state
  net: inet_diag: export IPV6_V6ONLY sockopt
  stmmac: troubleshoot unexpected bits in des0 & des1
  net: ipv4 sysctl option to ignore routes when nexthop link is down
  net: track link-status of ipv4 nexthops
  net: switchdev: ignore unsupported bridge flags
  net: Cavium: Fix MAC address setting in shutdown state
  drivers: net: xgene: fix for ACPI support without ACPI
  ip: report the original address of ICMP messages
  net/mlx5e: Prefetch skb data on RX
  net/mlx5e: Pop cq outside mlx5e_get_cqe
  net/mlx5e: Remove mlx5e_cq.sqrq back-pointer
  net/mlx5e: Remove extra spaces
  net/mlx5e: Avoid TX CQE generation if more xmit packets expected
  net/mlx5e: Avoid redundant dev_kfree_skb() upon NOP completion
  net/mlx5e: Remove re-assignment of wq type in mlx5e_enable_rq()
  net/mlx5e: Use skb_shinfo(skb)->gso_segs rather than counting them
  net/mlx5e: Static mapping of netdev priv resources to/from netdev TX queues
  net/mlx4_en: Use HW counters for rx/tx bytes/packets in PF device
  ...

1 files changed, 762 insertions, 0 deletions

diff --git a/drivers/net/ieee802154/atusb.c b/drivers/net/ieee802154/atusb.c
new file mode 100644
index 0000000..80dfc72
--- /dev/null
+++ b/drivers/net/ieee802154/atusb.c
@@ -0,0 +1,762 @@
+/*
+ * atusb.c - Driver for the ATUSB IEEE 802.15.4 dongle
+ *
+ * Written 2013 by Werner Almesberger <werner@almesberger.net>
+ *
+ * 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, version 2
+ *
+ * Based on at86rf230.c and spi_atusb.c.
+ * at86rf230.c is
+ * Copyright (C) 2009 Siemens AG
+ * Written by: Dmitry Eremin-Solenikov <dmitry.baryshkov@siemens.com>
+ *
+ * spi_atusb.c is
+ * Copyright (c) 2011 Richard Sharpe <realrichardsharpe@gmail.com>
+ * Copyright (c) 2011 Stefan Schmidt <stefan@datenfreihafen.org>
+ * Copyright (c) 2011 Werner Almesberger <werner@almesberger.net>
+ *
+ * USB initialization is
+ * Copyright (c) 2013 Alexander Aring <alex.aring@gmail.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/usb.h>
+#include <linux/skbuff.h>
+
+#include <net/cfg802154.h>
+#include <net/mac802154.h>
+
+#include "at86rf230.h"
+#include "atusb.h"
+
+#define ATUSB_JEDEC_ATMEL	0x1f	/* JEDEC manufacturer ID */
+
+#define ATUSB_NUM_RX_URBS	4	/* allow for a bit of local latency */
+#define ATUSB_ALLOC_DELAY_MS	100	/* delay after failed allocation */
+#define ATUSB_TX_TIMEOUT_MS	200	/* on the air timeout */
+
+struct atusb {
+	struct ieee802154_hw *hw;
+	struct usb_device *usb_dev;
+	int shutdown;			/* non-zero if shutting down */
+	int err;			/* set by first error */
+
+	/* RX variables */
+	struct delayed_work work;	/* memory allocations */
+	struct usb_anchor idle_urbs;	/* URBs waiting to be submitted */
+	struct usb_anchor rx_urbs;	/* URBs waiting for reception */
+
+	/* TX variables */
+	struct usb_ctrlrequest tx_dr;
+	struct urb *tx_urb;
+	struct sk_buff *tx_skb;
+	uint8_t tx_ack_seq;		/* current TX ACK sequence number */
+};
+
+/* ----- USB commands without data ----------------------------------------- */
+
+/* To reduce the number of error checks in the code, we record the first error
+ * in atusb->err and reject all subsequent requests until the error is cleared.
+ */
+
+static int atusb_control_msg(struct atusb *atusb, unsigned int pipe,
+			     __u8 request, __u8 requesttype,
+			     __u16 value, __u16 index,
+			     void *data, __u16 size, int timeout)
+{
+	struct usb_device *usb_dev = atusb->usb_dev;
+	int ret;
+
+	if (atusb->err)
+		return atusb->err;
+
+	ret = usb_control_msg(usb_dev, pipe, request, requesttype,
+			      value, index, data, size, timeout);
+	if (ret < 0) {
+		atusb->err = ret;
+		dev_err(&usb_dev->dev,
+			"atusb_control_msg: req 0x%02x val 0x%x idx 0x%x, error %d\n",
+			request, value, index, ret);
+	}
+	return ret;
+}
+
+static int atusb_command(struct atusb *atusb, uint8_t cmd, uint8_t arg)
+{
+	struct usb_device *usb_dev = atusb->usb_dev;
+
+	dev_dbg(&usb_dev->dev, "atusb_command: cmd = 0x%x\n", cmd);
+	return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
+				 cmd, ATUSB_REQ_TO_DEV, arg, 0, NULL, 0, 1000);
+}
+
+static int atusb_write_reg(struct atusb *atusb, uint8_t reg, uint8_t value)
+{
+	struct usb_device *usb_dev = atusb->usb_dev;
+
+	dev_dbg(&usb_dev->dev, "atusb_write_reg: 0x%02x <- 0x%02x\n",
+		reg, value);
+	return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
+				 ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
+				 value, reg, NULL, 0, 1000);
+}
+
+static int atusb_read_reg(struct atusb *atusb, uint8_t reg)
+{
+	struct usb_device *usb_dev = atusb->usb_dev;
+	int ret;
+	uint8_t value;
+
+	dev_dbg(&usb_dev->dev, "atusb: reg = 0x%x\n", reg);
+	ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
+				ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
+				0, reg, &value, 1, 1000);
+	return ret >= 0 ? value : ret;
+}
+
+static int atusb_write_subreg(struct atusb *atusb, uint8_t reg, uint8_t mask,
+			      uint8_t shift, uint8_t value)
+{
+	struct usb_device *usb_dev = atusb->usb_dev;
+	uint8_t orig, tmp;
+	int ret = 0;
+
+	dev_dbg(&usb_dev->dev, "atusb_write_subreg: 0x%02x <- 0x%02x\n",
+		reg, value);
+
+	orig = atusb_read_reg(atusb, reg);
+
+	/* Write the value only into that part of the register which is allowed
+	 * by the mask. All other bits stay as before.
+	 */
+	tmp = orig & ~mask;
+	tmp |= (value << shift) & mask;
+
+	if (tmp != orig)
+		ret = atusb_write_reg(atusb, reg, tmp);
+
+	return ret;
+}
+
+static int atusb_get_and_clear_error(struct atusb *atusb)
+{
+	int err = atusb->err;
+
+	atusb->err = 0;
+	return err;
+}
+
+/* ----- skb allocation ---------------------------------------------------- */
+
+#define MAX_PSDU	127
+#define MAX_RX_XFER	(1 + MAX_PSDU + 2 + 1)	/* PHR+PSDU+CRC+LQI */
+
+#define SKB_ATUSB(skb)	(*(struct atusb **)(skb)->cb)
+
+static void atusb_in(struct urb *urb);
+
+static int atusb_submit_rx_urb(struct atusb *atusb, struct urb *urb)
+{
+	struct usb_device *usb_dev = atusb->usb_dev;
+	struct sk_buff *skb = urb->context;
+	int ret;
+
+	if (!skb) {
+		skb = alloc_skb(MAX_RX_XFER, GFP_KERNEL);
+		if (!skb) {
+			dev_warn_ratelimited(&usb_dev->dev,
+					     "atusb_in: can't allocate skb\n");
+			return -ENOMEM;
+		}
+		skb_put(skb, MAX_RX_XFER);
+		SKB_ATUSB(skb) = atusb;
+	}
+
+	usb_fill_bulk_urb(urb, usb_dev, usb_rcvbulkpipe(usb_dev, 1),
+			  skb->data, MAX_RX_XFER, atusb_in, skb);
+	usb_anchor_urb(urb, &atusb->rx_urbs);
+
+	ret = usb_submit_urb(urb, GFP_KERNEL);
+	if (ret) {
+		usb_unanchor_urb(urb);
+		kfree_skb(skb);
+		urb->context = NULL;
+	}
+	return ret;
+}
+
+static void atusb_work_urbs(struct work_struct *work)
+{
+	struct atusb *atusb =
+	    container_of(to_delayed_work(work), struct atusb, work);
+	struct usb_device *usb_dev = atusb->usb_dev;
+	struct urb *urb;
+	int ret;
+
+	if (atusb->shutdown)
+		return;
+
+	do {
+		urb = usb_get_from_anchor(&atusb->idle_urbs);
+		if (!urb)
+			return;
+		ret = atusb_submit_rx_urb(atusb, urb);
+	} while (!ret);
+
+	usb_anchor_urb(urb, &atusb->idle_urbs);
+	dev_warn_ratelimited(&usb_dev->dev,
+			     "atusb_in: can't allocate/submit URB (%d)\n", ret);
+	schedule_delayed_work(&atusb->work,
+			      msecs_to_jiffies(ATUSB_ALLOC_DELAY_MS) + 1);
+}
+
+/* ----- Asynchronous USB -------------------------------------------------- */
+
+static void atusb_tx_done(struct atusb *atusb, uint8_t seq)
+{
+	struct usb_device *usb_dev = atusb->usb_dev;
+	uint8_t expect = atusb->tx_ack_seq;
+
+	dev_dbg(&usb_dev->dev, "atusb_tx_done (0x%02x/0x%02x)\n", seq, expect);
+	if (seq == expect) {
+		/* TODO check for ifs handling in firmware */
+		ieee802154_xmit_complete(atusb->hw, atusb->tx_skb, false);
+	} else {
+		/* TODO I experience this case when atusb has a tx complete
+		 * irq before probing, we should fix the firmware it's an
+		 * unlikely case now that seq == expect is then true, but can
+		 * happen and fail with a tx_skb = NULL;
+		 */
+		ieee802154_wake_queue(atusb->hw);
+		if (atusb->tx_skb)
+			dev_kfree_skb_irq(atusb->tx_skb);
+	}
+}
+
+static void atusb_in_good(struct urb *urb)
+{
+	struct usb_device *usb_dev = urb->dev;
+	struct sk_buff *skb = urb->context;
+	struct atusb *atusb = SKB_ATUSB(skb);
+	uint8_t len, lqi;
+
+	if (!urb->actual_length) {
+		dev_dbg(&usb_dev->dev, "atusb_in: zero-sized URB ?\n");
+		return;
+	}
+
+	len = *skb->data;
+
+	if (urb->actual_length == 1) {
+		atusb_tx_done(atusb, len);
+		return;
+	}
+
+	if (len + 1 > urb->actual_length - 1) {
+		dev_dbg(&usb_dev->dev, "atusb_in: frame len %d+1 > URB %u-1\n",
+			len, urb->actual_length);
+		return;
+	}
+
+	if (!ieee802154_is_valid_psdu_len(len)) {
+		dev_dbg(&usb_dev->dev, "atusb_in: frame corrupted\n");
+		return;
+	}
+
+	lqi = skb->data[len + 1];
+	dev_dbg(&usb_dev->dev, "atusb_in: rx len %d lqi 0x%02x\n", len, lqi);
+	skb_pull(skb, 1);	/* remove PHR */
+	skb_trim(skb, len);	/* get payload only */
+	ieee802154_rx_irqsafe(atusb->hw, skb, lqi);
+	urb->context = NULL;	/* skb is gone */
+}
+
+static void atusb_in(struct urb *urb)
+{
+	struct usb_device *usb_dev = urb->dev;
+	struct sk_buff *skb = urb->context;
+	struct atusb *atusb = SKB_ATUSB(skb);
+
+	dev_dbg(&usb_dev->dev, "atusb_in: status %d len %d\n",
+		urb->status, urb->actual_length);
+	if (urb->status) {
+		if (urb->status == -ENOENT) { /* being killed */
+			kfree_skb(skb);
+			urb->context = NULL;
+			return;
+		}
+		dev_dbg(&usb_dev->dev, "atusb_in: URB error %d\n", urb->status);
+	} else {
+		atusb_in_good(urb);
+	}
+
+	usb_anchor_urb(urb, &atusb->idle_urbs);
+	if (!atusb->shutdown)
+		schedule_delayed_work(&atusb->work, 0);
+}
+
+/* ----- URB allocation/deallocation --------------------------------------- */
+
+static void atusb_free_urbs(struct atusb *atusb)
+{
+	struct urb *urb;
+
+	while (1) {
+		urb = usb_get_from_anchor(&atusb->idle_urbs);
+		if (!urb)
+			break;
+		if (urb->context)
+			kfree_skb(urb->context);
+		usb_free_urb(urb);
+	}
+}
+
+static int atusb_alloc_urbs(struct atusb *atusb, int n)
+{
+	struct urb *urb;
+
+	while (n) {
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!urb) {
+			atusb_free_urbs(atusb);
+			return -ENOMEM;
+		}
+		usb_anchor_urb(urb, &atusb->idle_urbs);
+		n--;
+	}
+	return 0;
+}
+
+/* ----- IEEE 802.15.4 interface operations -------------------------------- */
+
+static void atusb_xmit_complete(struct urb *urb)
+{
+	dev_dbg(&urb->dev->dev, "atusb_xmit urb completed");
+}
+
+static int atusb_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
+{
+	struct atusb *atusb = hw->priv;
+	struct usb_device *usb_dev = atusb->usb_dev;
+	int ret;
+
+	dev_dbg(&usb_dev->dev, "atusb_xmit (%d)\n", skb->len);
+	atusb->tx_skb = skb;
+	atusb->tx_ack_seq++;
+	atusb->tx_dr.wIndex = cpu_to_le16(atusb->tx_ack_seq);
+	atusb->tx_dr.wLength = cpu_to_le16(skb->len);
+
+	usb_fill_control_urb(atusb->tx_urb, usb_dev,
+			     usb_sndctrlpipe(usb_dev, 0),
+			     (unsigned char *)&atusb->tx_dr, skb->data,
+			     skb->len, atusb_xmit_complete, NULL);
+	ret = usb_submit_urb(atusb->tx_urb, GFP_ATOMIC);
+	dev_dbg(&usb_dev->dev, "atusb_xmit done (%d)\n", ret);
+	return ret;
+}
+
+static int atusb_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
+{
+	struct atusb *atusb = hw->priv;
+	int ret;
+
+	/* This implicitly sets the CCA (Clear Channel Assessment) mode to 0,
+	 * "Mode 3a, Carrier sense OR energy above threshold".
+	 * We should probably make this configurable. @@@
+	 */
+	ret = atusb_write_reg(atusb, RG_PHY_CC_CCA, channel);
+	if (ret < 0)
+		return ret;
+	msleep(1);	/* @@@ ugly synchronization */
+	return 0;
+}
+
+static int atusb_ed(struct ieee802154_hw *hw, u8 *level)
+{
+	BUG_ON(!level);
+	*level = 0xbe;
+	return 0;
+}
+
+static int atusb_set_hw_addr_filt(struct ieee802154_hw *hw,
+				  struct ieee802154_hw_addr_filt *filt,
+				  unsigned long changed)
+{
+	struct atusb *atusb = hw->priv;
+	struct device *dev = &atusb->usb_dev->dev;
+
+	if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
+		u16 addr = le16_to_cpu(filt->short_addr);
+
+		dev_vdbg(dev, "atusb_set_hw_addr_filt called for saddr\n");
+		atusb_write_reg(atusb, RG_SHORT_ADDR_0, addr);
+		atusb_write_reg(atusb, RG_SHORT_ADDR_1, addr >> 8);
+	}
+
+	if (changed & IEEE802154_AFILT_PANID_CHANGED) {
+		u16 pan = le16_to_cpu(filt->pan_id);
+
+		dev_vdbg(dev, "atusb_set_hw_addr_filt called for pan id\n");
+		atusb_write_reg(atusb, RG_PAN_ID_0, pan);
+		atusb_write_reg(atusb, RG_PAN_ID_1, pan >> 8);
+	}
+
+	if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
+		u8 i, addr[IEEE802154_EXTENDED_ADDR_LEN];
+
+		memcpy(addr, &filt->ieee_addr, IEEE802154_EXTENDED_ADDR_LEN);
+		dev_vdbg(dev, "atusb_set_hw_addr_filt called for IEEE addr\n");
+		for (i = 0; i < 8; i++)
+			atusb_write_reg(atusb, RG_IEEE_ADDR_0 + i, addr[i]);
+	}
+
+	if (changed & IEEE802154_AFILT_PANC_CHANGED) {
+		dev_vdbg(dev,
+			 "atusb_set_hw_addr_filt called for panc change\n");
+		if (filt->pan_coord)
+			atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 1);
+		else
+			atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 0);
+	}
+
+	return atusb_get_and_clear_error(atusb);
+}
+
+static int atusb_start(struct ieee802154_hw *hw)
+{
+	struct atusb *atusb = hw->priv;
+	struct usb_device *usb_dev = atusb->usb_dev;
+	int ret;
+
+	dev_dbg(&usb_dev->dev, "atusb_start\n");
+	schedule_delayed_work(&atusb->work, 0);
+	atusb_command(atusb, ATUSB_RX_MODE, 1);
+	ret = atusb_get_and_clear_error(atusb);
+	if (ret < 0)
+		usb_kill_anchored_urbs(&atusb->idle_urbs);
+	return ret;
+}
+
+static void atusb_stop(struct ieee802154_hw *hw)
+{
+	struct atusb *atusb = hw->priv;
+	struct usb_device *usb_dev = atusb->usb_dev;
+
+	dev_dbg(&usb_dev->dev, "atusb_stop\n");
+	usb_kill_anchored_urbs(&atusb->idle_urbs);
+	atusb_command(atusb, ATUSB_RX_MODE, 0);
+	atusb_get_and_clear_error(atusb);
+}
+
+#define ATUSB_MAX_TX_POWERS 0xF
+static const s32 atusb_powers[ATUSB_MAX_TX_POWERS + 1] = {
+	300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
+	-900, -1200, -1700,
+};
+
+static int
+atusb_set_txpower(struct ieee802154_hw *hw, s32 mbm)
+{
+	struct atusb *atusb = hw->priv;
+	u32 i;
+
+	for (i = 0; i < hw->phy->supported.tx_powers_size; i++) {
+		if (hw->phy->supported.tx_powers[i] == mbm)
+			return atusb_write_subreg(atusb, SR_TX_PWR_23X, i);
+	}
+
+	return -EINVAL;
+}
+
+static int
+atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
+{
+	struct atusb *atusb = hw->priv;
+	int ret;
+
+	if (on) {
+		ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 1);
+		if (ret < 0)
+			return ret;
+
+		ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 1);
+		if (ret < 0)
+			return ret;
+	} else {
+		ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 0);
+		if (ret < 0)
+			return ret;
+
+		ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 0);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static struct ieee802154_ops atusb_ops = {
+	.owner			= THIS_MODULE,
+	.xmit_async		= atusb_xmit,
+	.ed			= atusb_ed,
+	.set_channel		= atusb_channel,
+	.start			= atusb_start,
+	.stop			= atusb_stop,
+	.set_hw_addr_filt	= atusb_set_hw_addr_filt,
+	.set_txpower		= atusb_set_txpower,
+	.set_promiscuous_mode	= atusb_set_promiscuous_mode,
+};
+
+/* ----- Firmware and chip version information ----------------------------- */
+
+static int atusb_get_and_show_revision(struct atusb *atusb)
+{
+	struct usb_device *usb_dev = atusb->usb_dev;
+	unsigned char buffer[3];
+	int ret;
+
+	/* Get a couple of the ATMega Firmware values */
+	ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
+				ATUSB_ID, ATUSB_REQ_FROM_DEV, 0, 0,
+				buffer, 3, 1000);
+	if (ret >= 0)
+		dev_info(&usb_dev->dev,
+			 "Firmware: major: %u, minor: %u, hardware type: %u\n",
+			 buffer[0], buffer[1], buffer[2]);
+	if (buffer[0] == 0 && buffer[1] < 2) {
+		dev_info(&usb_dev->dev,
+			 "Firmware version (%u.%u) is predates our first public release.",
+			 buffer[0], buffer[1]);
+		dev_info(&usb_dev->dev, "Please update to version 0.2 or newer");
+	}
+
+	return ret;
+}
+
+static int atusb_get_and_show_build(struct atusb *atusb)
+{
+	struct usb_device *usb_dev = atusb->usb_dev;
+	char build[ATUSB_BUILD_SIZE + 1];
+	int ret;
+
+	ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
+				ATUSB_BUILD, ATUSB_REQ_FROM_DEV, 0, 0,
+				build, ATUSB_BUILD_SIZE, 1000);
+	if (ret >= 0) {
+		build[ret] = 0;
+		dev_info(&usb_dev->dev, "Firmware: build %s\n", build);
+	}
+
+	return ret;
+}
+
+static int atusb_get_and_show_chip(struct atusb *atusb)
+{
+	struct usb_device *usb_dev = atusb->usb_dev;
+	uint8_t man_id_0, man_id_1, part_num, version_num;
+
+	man_id_0 = atusb_read_reg(atusb, RG_MAN_ID_0);
+	man_id_1 = atusb_read_reg(atusb, RG_MAN_ID_1);
+	part_num = atusb_read_reg(atusb, RG_PART_NUM);
+	version_num = atusb_read_reg(atusb, RG_VERSION_NUM);
+
+	if (atusb->err)
+		return atusb->err;
+
+	if ((man_id_1 << 8 | man_id_0) != ATUSB_JEDEC_ATMEL) {
+		dev_err(&usb_dev->dev,
+			"non-Atmel transceiver xxxx%02x%02x\n",
+			man_id_1, man_id_0);
+		goto fail;
+	}
+	if (part_num != 3 && part_num != 2) {
+		dev_err(&usb_dev->dev,
+			"unexpected transceiver, part 0x%02x version 0x%02x\n",
+			part_num, version_num);
+		goto fail;
+	}
+
+	dev_info(&usb_dev->dev, "ATUSB: AT86RF231 version %d\n", version_num);
+
+	return 0;
+
+fail:
+	atusb->err = -ENODEV;
+	return -ENODEV;
+}
+
+/* ----- Setup ------------------------------------------------------------- */
+
+static int atusb_probe(struct usb_interface *interface,
+		       const struct usb_device_id *id)
+{
+	struct usb_device *usb_dev = interface_to_usbdev(interface);
+	struct ieee802154_hw *hw;
+	struct atusb *atusb = NULL;
+	int ret = -ENOMEM;
+
+	hw = ieee802154_alloc_hw(sizeof(struct atusb), &atusb_ops);
+	if (!hw)
+		return -ENOMEM;
+
+	atusb = hw->priv;
+	atusb->hw = hw;
+	atusb->usb_dev = usb_get_dev(usb_dev);
+	usb_set_intfdata(interface, atusb);
+
+	atusb->shutdown = 0;
+	atusb->err = 0;
+	INIT_DELAYED_WORK(&atusb->work, atusb_work_urbs);
+	init_usb_anchor(&atusb->idle_urbs);
+	init_usb_anchor(&atusb->rx_urbs);
+
+	if (atusb_alloc_urbs(atusb, ATUSB_NUM_RX_URBS))
+		goto fail;
+
+	atusb->tx_dr.bRequestType = ATUSB_REQ_TO_DEV;
+	atusb->tx_dr.bRequest = ATUSB_TX;
+	atusb->tx_dr.wValue = cpu_to_le16(0);
+
+	atusb->tx_urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!atusb->tx_urb)
+		goto fail;
+
+	hw->parent = &usb_dev->dev;
+	hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
+		    IEEE802154_HW_PROMISCUOUS;
+
+	hw->phy->flags = WPAN_PHY_FLAG_TXPOWER;
+
+	hw->phy->current_page = 0;
+	hw->phy->current_channel = 11;	/* reset default */
+	hw->phy->supported.channels[0] = 0x7FFF800;
+	hw->phy->supported.tx_powers = atusb_powers;
+	hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
+	hw->phy->transmit_power = hw->phy->supported.tx_powers[0];
+	ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
+
+	atusb_command(atusb, ATUSB_RF_RESET, 0);
+	atusb_get_and_show_chip(atusb);
+	atusb_get_and_show_revision(atusb);
+	atusb_get_and_show_build(atusb);
+	ret = atusb_get_and_clear_error(atusb);
+	if (ret) {
+		dev_err(&atusb->usb_dev->dev,
+			"%s: initialization failed, error = %d\n",
+			__func__, ret);
+		goto fail;
+	}
+
+	ret = ieee802154_register_hw(hw);
+	if (ret)
+		goto fail;
+
+	/* If we just powered on, we're now in P_ON and need to enter TRX_OFF
+	 * explicitly. Any resets after that will send us straight to TRX_OFF,
+	 * making the command below redundant.
+	 */
+	atusb_write_reg(atusb, RG_TRX_STATE, STATE_FORCE_TRX_OFF);
+	msleep(1);	/* reset => TRX_OFF, tTR13 = 37 us */
+
+#if 0
+	/* Calculating the maximum time available to empty the frame buffer
+	 * on reception:
+	 *
+	 * According to [1], the inter-frame gap is
+	 * R * 20 * 16 us + 128 us
+	 * where R is a random number from 0 to 7. Furthermore, we have 20 bit
+	 * times (80 us at 250 kbps) of SHR of the next frame before the
+	 * transceiver begins storing data in the frame buffer.
+	 *
+	 * This yields a minimum time of 208 us between the last data of a
+	 * frame and the first data of the next frame. This time is further
+	 * reduced by interrupt latency in the atusb firmware.
+	 *
+	 * atusb currently needs about 500 us to retrieve a maximum-sized
+	 * frame. We therefore have to allow reception of a new frame to begin
+	 * while we retrieve the previous frame.
+	 *
+	 * [1] "JN-AN-1035 Calculating data rates in an IEEE 802.15.4-based
+	 *      network", Jennic 2006.
+	 *     http://www.jennic.com/download_file.php?supportFile=JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf
+	 */
+
+	atusb_write_subreg(atusb, SR_RX_SAFE_MODE, 1);
+#endif
+	atusb_write_reg(atusb, RG_IRQ_MASK, 0xff);
+
+	ret = atusb_get_and_clear_error(atusb);
+	if (!ret)
+		return 0;
+
+	dev_err(&atusb->usb_dev->dev,
+		"%s: setup failed, error = %d\n",
+		__func__, ret);
+
+	ieee802154_unregister_hw(hw);
+fail:
+	atusb_free_urbs(atusb);
+	usb_kill_urb(atusb->tx_urb);
+	usb_free_urb(atusb->tx_urb);
+	usb_put_dev(usb_dev);
+	ieee802154_free_hw(hw);
+	return ret;
+}
+
+static void atusb_disconnect(struct usb_interface *interface)
+{
+	struct atusb *atusb = usb_get_intfdata(interface);
+
+	dev_dbg(&atusb->usb_dev->dev, "atusb_disconnect\n");
+
+	atusb->shutdown = 1;
+	cancel_delayed_work_sync(&atusb->work);
+
+	usb_kill_anchored_urbs(&atusb->rx_urbs);
+	atusb_free_urbs(atusb);
+	usb_kill_urb(atusb->tx_urb);
+	usb_free_urb(atusb->tx_urb);
+
+	ieee802154_unregister_hw(atusb->hw);
+
+	ieee802154_free_hw(atusb->hw);
+
+	usb_set_intfdata(interface, NULL);
+	usb_put_dev(atusb->usb_dev);
+
+	pr_debug("atusb_disconnect done\n");
+}
+
+/* The devices we work with */
+static const struct usb_device_id atusb_device_table[] = {
+	{
+		.match_flags		= USB_DEVICE_ID_MATCH_DEVICE |
+					  USB_DEVICE_ID_MATCH_INT_INFO,
+		.idVendor		= ATUSB_VENDOR_ID,
+		.idProduct		= ATUSB_PRODUCT_ID,
+		.bInterfaceClass	= USB_CLASS_VENDOR_SPEC
+	},
+	/* end with null element */
+	{}
+};
+MODULE_DEVICE_TABLE(usb, atusb_device_table);
+
+static struct usb_driver atusb_driver = {
+	.name		= "atusb",
+	.probe		= atusb_probe,
+	.disconnect	= atusb_disconnect,
+	.id_table	= atusb_device_table,
+};
+module_usb_driver(atusb_driver);
+
+MODULE_AUTHOR("Alexander Aring <alex.aring@gmail.com>");
+MODULE_AUTHOR("Richard Sharpe <realrichardsharpe@gmail.com>");
+MODULE_AUTHOR("Stefan Schmidt <stefan@datenfreihafen.org>");
+MODULE_AUTHOR("Werner Almesberger <werner@almesberger.net>");
+MODULE_DESCRIPTION("ATUSB IEEE 802.15.4 Driver");
+MODULE_LICENSE("GPL");