These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

1 files changed, 771 insertions, 0 deletions

diff --git a/kernel/drivers/net/ieee802154/atusb.c b/kernel/drivers/net/ieee802154/atusb.c
new file mode 100644
index 000000000..199a94a9c
--- /dev/null
+++ b/kernel/drivers/net/ieee802154/atusb.c
@@ -0,0 +1,771 @@
+/*
+ * 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;
+	const char *chip;
+
+	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;
+	}
+
+	switch (part_num) {
+	case 2:
+		chip = "AT86RF230";
+		break;
+	case 3:
+		chip = "AT86RF231";
+		break;
+	default:
+		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: %s version %d\n", chip, 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");