Initial import

15 files changed, 11081 insertions, 0 deletions

diff --git a/drivers/net/can/usb/Kconfig b/drivers/net/can/usb/Kconfig
new file mode 100644
index 000000000..bcb272f6c
--- /dev/null
+++ b/drivers/net/can/usb/Kconfig
@@ -0,0 +1,81 @@
+menu "CAN USB interfaces"
+	depends on USB
+
+config CAN_EMS_USB
+	tristate "EMS CPC-USB/ARM7 CAN/USB interface"
+	---help---
+	  This driver is for the one channel CPC-USB/ARM7 CAN/USB interface
+	  from EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).
+
+config CAN_ESD_USB2
+        tristate "ESD USB/2 CAN/USB interface"
+        ---help---
+          This driver supports the CAN-USB/2 interface
+          from esd electronic system design gmbh (http://www.esd.eu).
+
+config CAN_GS_USB
+	tristate "Geschwister Schneider UG interfaces"
+	---help---
+	  This driver supports the Geschwister Schneider USB/CAN devices.
+	  If unsure choose N,
+	  choose Y for built in support,
+	  M to compile as module (module will be named: gs_usb).
+
+config CAN_KVASER_USB
+	tristate "Kvaser CAN/USB interface"
+	---help---
+	  This driver adds support for Kvaser CAN/USB devices like Kvaser
+	  Leaf Light and Kvaser USBcan II.
+
+	  The driver provides support for the following devices:
+	    - Kvaser Leaf Light
+	    - Kvaser Leaf Professional HS
+	    - Kvaser Leaf SemiPro HS
+	    - Kvaser Leaf Professional LS
+	    - Kvaser Leaf Professional SWC
+	    - Kvaser Leaf Professional LIN
+	    - Kvaser Leaf SemiPro LS
+	    - Kvaser Leaf SemiPro SWC
+	    - Kvaser Memorator II HS/HS
+	    - Kvaser USBcan Professional HS/HS
+	    - Kvaser Leaf Light GI
+	    - Kvaser Leaf Professional HS (OBD-II connector)
+	    - Kvaser Memorator Professional HS/LS
+	    - Kvaser Leaf Light "China"
+	    - Kvaser BlackBird SemiPro
+	    - Kvaser USBcan R
+	    - Kvaser Leaf Light v2
+	    - Kvaser Mini PCI Express HS
+	    - Kvaser USBcan II HS/HS
+	    - Kvaser USBcan II HS/LS
+	    - Kvaser USBcan Rugged ("USBcan Rev B")
+	    - Kvaser Memorator HS/HS
+	    - Kvaser Memorator HS/LS
+	    - Scania VCI2 (if you have the Kvaser logo on top)
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called kvaser_usb.
+
+config CAN_PEAK_USB
+	tristate "PEAK PCAN-USB/USB Pro interfaces for CAN 2.0b/CAN-FD"
+	---help---
+	  This driver supports the PEAK-System Technik USB adapters that enable
+	  access to the CAN bus, with repect to the CAN 2.0b and/or CAN-FD
+	  standards, that is:
+
+	  PCAN-USB             single CAN 2.0b channel USB adapter
+	  PCAN-USB Pro         dual CAN 2.0b channels USB adapter
+	  PCAN-USB FD          single CAN-FD channel USB adapter
+	  PCAN-USB Pro FD      dual CAN-FD channels USB adapter
+
+	  (see also http://www.peak-system.com).
+
+config CAN_8DEV_USB
+	tristate "8 devices USB2CAN interface"
+	---help---
+	  This driver supports the USB2CAN interface
+	  from 8 devices (http://www.8devices.com).
+
+endmenu
diff --git a/drivers/net/can/usb/Makefile b/drivers/net/can/usb/Makefile
new file mode 100644
index 000000000..a64cf983f
--- /dev/null
+++ b/drivers/net/can/usb/Makefile
@@ -0,0 +1,10 @@
+#
+#  Makefile for the Linux Controller Area Network USB drivers.
+#
+
+obj-$(CONFIG_CAN_EMS_USB) += ems_usb.o
+obj-$(CONFIG_CAN_ESD_USB2) += esd_usb2.o
+obj-$(CONFIG_CAN_GS_USB) += gs_usb.o
+obj-$(CONFIG_CAN_KVASER_USB) += kvaser_usb.o
+obj-$(CONFIG_CAN_PEAK_USB) += peak_usb/
+obj-$(CONFIG_CAN_8DEV_USB) += usb_8dev.o
diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c
new file mode 100644
index 000000000..866bac0ae
--- /dev/null
+++ b/drivers/net/can/usb/ems_usb.c
@@ -0,0 +1,1087 @@
+/*
+ * CAN driver for EMS Dr. Thomas Wuensche CPC-USB/ARM7
+ *
+ * Copyright (C) 2004-2009 EMS Dr. Thomas Wuensche
+ *
+ * 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 of the License.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+MODULE_AUTHOR("Sebastian Haas <haas@ems-wuensche.com>");
+MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces");
+MODULE_LICENSE("GPL v2");
+
+/* Control-Values for CPC_Control() Command Subject Selection */
+#define CONTR_CAN_MESSAGE 0x04
+#define CONTR_CAN_STATE   0x0C
+#define CONTR_BUS_ERROR   0x1C
+
+/* Control Command Actions */
+#define CONTR_CONT_OFF 0
+#define CONTR_CONT_ON  1
+#define CONTR_ONCE     2
+
+/* Messages from CPC to PC */
+#define CPC_MSG_TYPE_CAN_FRAME       1  /* CAN data frame */
+#define CPC_MSG_TYPE_RTR_FRAME       8  /* CAN remote frame */
+#define CPC_MSG_TYPE_CAN_PARAMS      12 /* Actual CAN parameters */
+#define CPC_MSG_TYPE_CAN_STATE       14 /* CAN state message */
+#define CPC_MSG_TYPE_EXT_CAN_FRAME   16 /* Extended CAN data frame */
+#define CPC_MSG_TYPE_EXT_RTR_FRAME   17 /* Extended remote frame */
+#define CPC_MSG_TYPE_CONTROL         19 /* change interface behavior */
+#define CPC_MSG_TYPE_CONFIRM         20 /* command processed confirmation */
+#define CPC_MSG_TYPE_OVERRUN         21 /* overrun events */
+#define CPC_MSG_TYPE_CAN_FRAME_ERROR 23 /* detected bus errors */
+#define CPC_MSG_TYPE_ERR_COUNTER     25 /* RX/TX error counter */
+
+/* Messages from the PC to the CPC interface  */
+#define CPC_CMD_TYPE_CAN_FRAME     1   /* CAN data frame */
+#define CPC_CMD_TYPE_CONTROL       3   /* control of interface behavior */
+#define CPC_CMD_TYPE_CAN_PARAMS    6   /* set CAN parameters */
+#define CPC_CMD_TYPE_RTR_FRAME     13  /* CAN remote frame */
+#define CPC_CMD_TYPE_CAN_STATE     14  /* CAN state message */
+#define CPC_CMD_TYPE_EXT_CAN_FRAME 15  /* Extended CAN data frame */
+#define CPC_CMD_TYPE_EXT_RTR_FRAME 16  /* Extended CAN remote frame */
+#define CPC_CMD_TYPE_CAN_EXIT      200 /* exit the CAN */
+
+#define CPC_CMD_TYPE_INQ_ERR_COUNTER 25 /* request the CAN error counters */
+#define CPC_CMD_TYPE_CLEAR_MSG_QUEUE 8  /* clear CPC_MSG queue */
+#define CPC_CMD_TYPE_CLEAR_CMD_QUEUE 28 /* clear CPC_CMD queue */
+
+#define CPC_CC_TYPE_SJA1000 2 /* Philips basic CAN controller */
+
+#define CPC_CAN_ECODE_ERRFRAME 0x01 /* Ecode type */
+
+/* Overrun types */
+#define CPC_OVR_EVENT_CAN       0x01
+#define CPC_OVR_EVENT_CANSTATE  0x02
+#define CPC_OVR_EVENT_BUSERROR  0x04
+
+/*
+ * If the CAN controller lost a message we indicate it with the highest bit
+ * set in the count field.
+ */
+#define CPC_OVR_HW 0x80
+
+/* Size of the "struct ems_cpc_msg" without the union */
+#define CPC_MSG_HEADER_LEN   11
+#define CPC_CAN_MSG_MIN_SIZE 5
+
+/* Define these values to match your devices */
+#define USB_CPCUSB_VENDOR_ID 0x12D6
+
+#define USB_CPCUSB_ARM7_PRODUCT_ID 0x0444
+
+/* Mode register NXP LPC2119/SJA1000 CAN Controller */
+#define SJA1000_MOD_NORMAL 0x00
+#define SJA1000_MOD_RM     0x01
+
+/* ECC register NXP LPC2119/SJA1000 CAN Controller */
+#define SJA1000_ECC_SEG   0x1F
+#define SJA1000_ECC_DIR   0x20
+#define SJA1000_ECC_ERR   0x06
+#define SJA1000_ECC_BIT   0x00
+#define SJA1000_ECC_FORM  0x40
+#define SJA1000_ECC_STUFF 0x80
+#define SJA1000_ECC_MASK  0xc0
+
+/* Status register content */
+#define SJA1000_SR_BS 0x80
+#define SJA1000_SR_ES 0x40
+
+#define SJA1000_DEFAULT_OUTPUT_CONTROL 0xDA
+
+/*
+ * The device actually uses a 16MHz clock to generate the CAN clock
+ * but it expects SJA1000 bit settings based on 8MHz (is internally
+ * converted).
+ */
+#define EMS_USB_ARM7_CLOCK 8000000
+
+/*
+ * CAN-Message representation in a CPC_MSG. Message object type is
+ * CPC_MSG_TYPE_CAN_FRAME or CPC_MSG_TYPE_RTR_FRAME or
+ * CPC_MSG_TYPE_EXT_CAN_FRAME or CPC_MSG_TYPE_EXT_RTR_FRAME.
+ */
+struct cpc_can_msg {
+	__le32 id;
+	u8 length;
+	u8 msg[8];
+};
+
+/* Representation of the CAN parameters for the SJA1000 controller */
+struct cpc_sja1000_params {
+	u8 mode;
+	u8 acc_code0;
+	u8 acc_code1;
+	u8 acc_code2;
+	u8 acc_code3;
+	u8 acc_mask0;
+	u8 acc_mask1;
+	u8 acc_mask2;
+	u8 acc_mask3;
+	u8 btr0;
+	u8 btr1;
+	u8 outp_contr;
+};
+
+/* CAN params message representation */
+struct cpc_can_params {
+	u8 cc_type;
+
+	/* Will support M16C CAN controller in the future */
+	union {
+		struct cpc_sja1000_params sja1000;
+	} cc_params;
+};
+
+/* Structure for confirmed message handling */
+struct cpc_confirm {
+	u8 error; /* error code */
+};
+
+/* Structure for overrun conditions */
+struct cpc_overrun {
+	u8 event;
+	u8 count;
+};
+
+/* SJA1000 CAN errors (compatible to NXP LPC2119) */
+struct cpc_sja1000_can_error {
+	u8 ecc;
+	u8 rxerr;
+	u8 txerr;
+};
+
+/* structure for CAN error conditions */
+struct cpc_can_error {
+	u8 ecode;
+
+	struct {
+		u8 cc_type;
+
+		/* Other controllers may also provide error code capture regs */
+		union {
+			struct cpc_sja1000_can_error sja1000;
+		} regs;
+	} cc;
+};
+
+/*
+ * Structure containing RX/TX error counter. This structure is used to request
+ * the values of the CAN controllers TX and RX error counter.
+ */
+struct cpc_can_err_counter {
+	u8 rx;
+	u8 tx;
+};
+
+/* Main message type used between library and application */
+struct __packed ems_cpc_msg {
+	u8 type;	/* type of message */
+	u8 length;	/* length of data within union 'msg' */
+	u8 msgid;	/* confirmation handle */
+	__le32 ts_sec;	/* timestamp in seconds */
+	__le32 ts_nsec;	/* timestamp in nano seconds */
+
+	union {
+		u8 generic[64];
+		struct cpc_can_msg can_msg;
+		struct cpc_can_params can_params;
+		struct cpc_confirm confirmation;
+		struct cpc_overrun overrun;
+		struct cpc_can_error error;
+		struct cpc_can_err_counter err_counter;
+		u8 can_state;
+	} msg;
+};
+
+/*
+ * Table of devices that work with this driver
+ * NOTE: This driver supports only CPC-USB/ARM7 (LPC2119) yet.
+ */
+static struct usb_device_id ems_usb_table[] = {
+	{USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_ARM7_PRODUCT_ID)},
+	{} /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, ems_usb_table);
+
+#define RX_BUFFER_SIZE      64
+#define CPC_HEADER_SIZE     4
+#define INTR_IN_BUFFER_SIZE 4
+
+#define MAX_RX_URBS 10
+#define MAX_TX_URBS 10
+
+struct ems_usb;
+
+struct ems_tx_urb_context {
+	struct ems_usb *dev;
+
+	u32 echo_index;
+	u8 dlc;
+};
+
+struct ems_usb {
+	struct can_priv can; /* must be the first member */
+
+	struct sk_buff *echo_skb[MAX_TX_URBS];
+
+	struct usb_device *udev;
+	struct net_device *netdev;
+
+	atomic_t active_tx_urbs;
+	struct usb_anchor tx_submitted;
+	struct ems_tx_urb_context tx_contexts[MAX_TX_URBS];
+
+	struct usb_anchor rx_submitted;
+
+	struct urb *intr_urb;
+
+	u8 *tx_msg_buffer;
+
+	u8 *intr_in_buffer;
+	unsigned int free_slots; /* remember number of available slots */
+
+	struct ems_cpc_msg active_params; /* active controller parameters */
+};
+
+static void ems_usb_read_interrupt_callback(struct urb *urb)
+{
+	struct ems_usb *dev = urb->context;
+	struct net_device *netdev = dev->netdev;
+	int err;
+
+	if (!netif_device_present(netdev))
+		return;
+
+	switch (urb->status) {
+	case 0:
+		dev->free_slots = dev->intr_in_buffer[1];
+		break;
+
+	case -ECONNRESET: /* unlink */
+	case -ENOENT:
+	case -ESHUTDOWN:
+		return;
+
+	default:
+		netdev_info(netdev, "Rx interrupt aborted %d\n", urb->status);
+		break;
+	}
+
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+
+	if (err == -ENODEV)
+		netif_device_detach(netdev);
+	else if (err)
+		netdev_err(netdev, "failed resubmitting intr urb: %d\n", err);
+}
+
+static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
+{
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	int i;
+	struct net_device_stats *stats = &dev->netdev->stats;
+
+	skb = alloc_can_skb(dev->netdev, &cf);
+	if (skb == NULL)
+		return;
+
+	cf->can_id = le32_to_cpu(msg->msg.can_msg.id);
+	cf->can_dlc = get_can_dlc(msg->msg.can_msg.length & 0xF);
+
+	if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME ||
+	    msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME)
+		cf->can_id |= CAN_EFF_FLAG;
+
+	if (msg->type == CPC_MSG_TYPE_RTR_FRAME ||
+	    msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) {
+		cf->can_id |= CAN_RTR_FLAG;
+	} else {
+		for (i = 0; i < cf->can_dlc; i++)
+			cf->data[i] = msg->msg.can_msg.msg[i];
+	}
+
+	netif_rx(skb);
+
+	stats->rx_packets++;
+	stats->rx_bytes += cf->can_dlc;
+}
+
+static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
+{
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	struct net_device_stats *stats = &dev->netdev->stats;
+
+	skb = alloc_can_err_skb(dev->netdev, &cf);
+	if (skb == NULL)
+		return;
+
+	if (msg->type == CPC_MSG_TYPE_CAN_STATE) {
+		u8 state = msg->msg.can_state;
+
+		if (state & SJA1000_SR_BS) {
+			dev->can.state = CAN_STATE_BUS_OFF;
+			cf->can_id |= CAN_ERR_BUSOFF;
+
+			dev->can.can_stats.bus_off++;
+			can_bus_off(dev->netdev);
+		} else if (state & SJA1000_SR_ES) {
+			dev->can.state = CAN_STATE_ERROR_WARNING;
+			dev->can.can_stats.error_warning++;
+		} else {
+			dev->can.state = CAN_STATE_ERROR_ACTIVE;
+			dev->can.can_stats.error_passive++;
+		}
+	} else if (msg->type == CPC_MSG_TYPE_CAN_FRAME_ERROR) {
+		u8 ecc = msg->msg.error.cc.regs.sja1000.ecc;
+		u8 txerr = msg->msg.error.cc.regs.sja1000.txerr;
+		u8 rxerr = msg->msg.error.cc.regs.sja1000.rxerr;
+
+		/* bus error interrupt */
+		dev->can.can_stats.bus_error++;
+		stats->rx_errors++;
+
+		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+
+		switch (ecc & SJA1000_ECC_MASK) {
+		case SJA1000_ECC_BIT:
+			cf->data[2] |= CAN_ERR_PROT_BIT;
+			break;
+		case SJA1000_ECC_FORM:
+			cf->data[2] |= CAN_ERR_PROT_FORM;
+			break;
+		case SJA1000_ECC_STUFF:
+			cf->data[2] |= CAN_ERR_PROT_STUFF;
+			break;
+		default:
+			cf->data[2] |= CAN_ERR_PROT_UNSPEC;
+			cf->data[3] = ecc & SJA1000_ECC_SEG;
+			break;
+		}
+
+		/* Error occurred during transmission? */
+		if ((ecc & SJA1000_ECC_DIR) == 0)
+			cf->data[2] |= CAN_ERR_PROT_TX;
+
+		if (dev->can.state == CAN_STATE_ERROR_WARNING ||
+		    dev->can.state == CAN_STATE_ERROR_PASSIVE) {
+			cf->data[1] = (txerr > rxerr) ?
+			    CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE;
+		}
+	} else if (msg->type == CPC_MSG_TYPE_OVERRUN) {
+		cf->can_id |= CAN_ERR_CRTL;
+		cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
+
+		stats->rx_over_errors++;
+		stats->rx_errors++;
+	}
+
+	netif_rx(skb);
+
+	stats->rx_packets++;
+	stats->rx_bytes += cf->can_dlc;
+}
+
+/*
+ * callback for bulk IN urb
+ */
+static void ems_usb_read_bulk_callback(struct urb *urb)
+{
+	struct ems_usb *dev = urb->context;
+	struct net_device *netdev;
+	int retval;
+
+	netdev = dev->netdev;
+
+	if (!netif_device_present(netdev))
+		return;
+
+	switch (urb->status) {
+	case 0: /* success */
+		break;
+
+	case -ENOENT:
+		return;
+
+	default:
+		netdev_info(netdev, "Rx URB aborted (%d)\n", urb->status);
+		goto resubmit_urb;
+	}
+
+	if (urb->actual_length > CPC_HEADER_SIZE) {
+		struct ems_cpc_msg *msg;
+		u8 *ibuf = urb->transfer_buffer;
+		u8 msg_count, start;
+
+		msg_count = ibuf[0] & ~0x80;
+
+		start = CPC_HEADER_SIZE;
+
+		while (msg_count) {
+			msg = (struct ems_cpc_msg *)&ibuf[start];
+
+			switch (msg->type) {
+			case CPC_MSG_TYPE_CAN_STATE:
+				/* Process CAN state changes */
+				ems_usb_rx_err(dev, msg);
+				break;
+
+			case CPC_MSG_TYPE_CAN_FRAME:
+			case CPC_MSG_TYPE_EXT_CAN_FRAME:
+			case CPC_MSG_TYPE_RTR_FRAME:
+			case CPC_MSG_TYPE_EXT_RTR_FRAME:
+				ems_usb_rx_can_msg(dev, msg);
+				break;
+
+			case CPC_MSG_TYPE_CAN_FRAME_ERROR:
+				/* Process errorframe */
+				ems_usb_rx_err(dev, msg);
+				break;
+
+			case CPC_MSG_TYPE_OVERRUN:
+				/* Message lost while receiving */
+				ems_usb_rx_err(dev, msg);
+				break;
+			}
+
+			start += CPC_MSG_HEADER_LEN + msg->length;
+			msg_count--;
+
+			if (start > urb->transfer_buffer_length) {
+				netdev_err(netdev, "format error\n");
+				break;
+			}
+		}
+	}
+
+resubmit_urb:
+	usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
+			  urb->transfer_buffer, RX_BUFFER_SIZE,
+			  ems_usb_read_bulk_callback, dev);
+
+	retval = usb_submit_urb(urb, GFP_ATOMIC);
+
+	if (retval == -ENODEV)
+		netif_device_detach(netdev);
+	else if (retval)
+		netdev_err(netdev,
+			   "failed resubmitting read bulk urb: %d\n", retval);
+}
+
+/*
+ * callback for bulk IN urb
+ */
+static void ems_usb_write_bulk_callback(struct urb *urb)
+{
+	struct ems_tx_urb_context *context = urb->context;
+	struct ems_usb *dev;
+	struct net_device *netdev;
+
+	BUG_ON(!context);
+
+	dev = context->dev;
+	netdev = dev->netdev;
+
+	/* free up our allocated buffer */
+	usb_free_coherent(urb->dev, urb->transfer_buffer_length,
+			  urb->transfer_buffer, urb->transfer_dma);
+
+	atomic_dec(&dev->active_tx_urbs);
+
+	if (!netif_device_present(netdev))
+		return;
+
+	if (urb->status)
+		netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
+
+	netdev->trans_start = jiffies;
+
+	/* transmission complete interrupt */
+	netdev->stats.tx_packets++;
+	netdev->stats.tx_bytes += context->dlc;
+
+	can_get_echo_skb(netdev, context->echo_index);
+
+	/* Release context */
+	context->echo_index = MAX_TX_URBS;
+
+	if (netif_queue_stopped(netdev))
+		netif_wake_queue(netdev);
+}
+
+/*
+ * Send the given CPC command synchronously
+ */
+static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
+{
+	int actual_length;
+
+	/* Copy payload */
+	memcpy(&dev->tx_msg_buffer[CPC_HEADER_SIZE], msg,
+	       msg->length + CPC_MSG_HEADER_LEN);
+
+	/* Clear header */
+	memset(&dev->tx_msg_buffer[0], 0, CPC_HEADER_SIZE);
+
+	return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2),
+			    &dev->tx_msg_buffer[0],
+			    msg->length + CPC_MSG_HEADER_LEN + CPC_HEADER_SIZE,
+			    &actual_length, 1000);
+}
+
+/*
+ * Change CAN controllers' mode register
+ */
+static int ems_usb_write_mode(struct ems_usb *dev, u8 mode)
+{
+	dev->active_params.msg.can_params.cc_params.sja1000.mode = mode;
+
+	return ems_usb_command_msg(dev, &dev->active_params);
+}
+
+/*
+ * Send a CPC_Control command to change behaviour when interface receives a CAN
+ * message, bus error or CAN state changed notifications.
+ */
+static int ems_usb_control_cmd(struct ems_usb *dev, u8 val)
+{
+	struct ems_cpc_msg cmd;
+
+	cmd.type = CPC_CMD_TYPE_CONTROL;
+	cmd.length = CPC_MSG_HEADER_LEN + 1;
+
+	cmd.msgid = 0;
+
+	cmd.msg.generic[0] = val;
+
+	return ems_usb_command_msg(dev, &cmd);
+}
+
+/*
+ * Start interface
+ */
+static int ems_usb_start(struct ems_usb *dev)
+{
+	struct net_device *netdev = dev->netdev;
+	int err, i;
+
+	dev->intr_in_buffer[0] = 0;
+	dev->free_slots = 15; /* initial size */
+
+	for (i = 0; i < MAX_RX_URBS; i++) {
+		struct urb *urb = NULL;
+		u8 *buf = NULL;
+
+		/* create a URB, and a buffer for it */
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!urb) {
+			netdev_err(netdev, "No memory left for URBs\n");
+			err = -ENOMEM;
+			break;
+		}
+
+		buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
+					 &urb->transfer_dma);
+		if (!buf) {
+			netdev_err(netdev, "No memory left for USB buffer\n");
+			usb_free_urb(urb);
+			err = -ENOMEM;
+			break;
+		}
+
+		usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
+				  buf, RX_BUFFER_SIZE,
+				  ems_usb_read_bulk_callback, dev);
+		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+		usb_anchor_urb(urb, &dev->rx_submitted);
+
+		err = usb_submit_urb(urb, GFP_KERNEL);
+		if (err) {
+			usb_unanchor_urb(urb);
+			usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
+					  urb->transfer_dma);
+			usb_free_urb(urb);
+			break;
+		}
+
+		/* Drop reference, USB core will take care of freeing it */
+		usb_free_urb(urb);
+	}
+
+	/* Did we submit any URBs */
+	if (i == 0) {
+		netdev_warn(netdev, "couldn't setup read URBs\n");
+		return err;
+	}
+
+	/* Warn if we've couldn't transmit all the URBs */
+	if (i < MAX_RX_URBS)
+		netdev_warn(netdev, "rx performance may be slow\n");
+
+	/* Setup and start interrupt URB */
+	usb_fill_int_urb(dev->intr_urb, dev->udev,
+			 usb_rcvintpipe(dev->udev, 1),
+			 dev->intr_in_buffer,
+			 INTR_IN_BUFFER_SIZE,
+			 ems_usb_read_interrupt_callback, dev, 1);
+
+	err = usb_submit_urb(dev->intr_urb, GFP_KERNEL);
+	if (err) {
+		netdev_warn(netdev, "intr URB submit failed: %d\n", err);
+
+		return err;
+	}
+
+	/* CPC-USB will transfer received message to host */
+	err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON);
+	if (err)
+		goto failed;
+
+	/* CPC-USB will transfer CAN state changes to host */
+	err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON);
+	if (err)
+		goto failed;
+
+	/* CPC-USB will transfer bus errors to host */
+	err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON);
+	if (err)
+		goto failed;
+
+	err = ems_usb_write_mode(dev, SJA1000_MOD_NORMAL);
+	if (err)
+		goto failed;
+
+	dev->can.state = CAN_STATE_ERROR_ACTIVE;
+
+	return 0;
+
+failed:
+	netdev_warn(netdev, "couldn't submit control: %d\n", err);
+
+	return err;
+}
+
+static void unlink_all_urbs(struct ems_usb *dev)
+{
+	int i;
+
+	usb_unlink_urb(dev->intr_urb);
+
+	usb_kill_anchored_urbs(&dev->rx_submitted);
+
+	usb_kill_anchored_urbs(&dev->tx_submitted);
+	atomic_set(&dev->active_tx_urbs, 0);
+
+	for (i = 0; i < MAX_TX_URBS; i++)
+		dev->tx_contexts[i].echo_index = MAX_TX_URBS;
+}
+
+static int ems_usb_open(struct net_device *netdev)
+{
+	struct ems_usb *dev = netdev_priv(netdev);
+	int err;
+
+	err = ems_usb_write_mode(dev, SJA1000_MOD_RM);
+	if (err)
+		return err;
+
+	/* common open */
+	err = open_candev(netdev);
+	if (err)
+		return err;
+
+	/* finally start device */
+	err = ems_usb_start(dev);
+	if (err) {
+		if (err == -ENODEV)
+			netif_device_detach(dev->netdev);
+
+		netdev_warn(netdev, "couldn't start device: %d\n", err);
+
+		close_candev(netdev);
+
+		return err;
+	}
+
+
+	netif_start_queue(netdev);
+
+	return 0;
+}
+
+static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct ems_usb *dev = netdev_priv(netdev);
+	struct ems_tx_urb_context *context = NULL;
+	struct net_device_stats *stats = &netdev->stats;
+	struct can_frame *cf = (struct can_frame *)skb->data;
+	struct ems_cpc_msg *msg;
+	struct urb *urb;
+	u8 *buf;
+	int i, err;
+	size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN
+			+ sizeof(struct cpc_can_msg);
+
+	if (can_dropped_invalid_skb(netdev, skb))
+		return NETDEV_TX_OK;
+
+	/* create a URB, and a buffer for it, and copy the data to the URB */
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!urb) {
+		netdev_err(netdev, "No memory left for URBs\n");
+		goto nomem;
+	}
+
+	buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma);
+	if (!buf) {
+		netdev_err(netdev, "No memory left for USB buffer\n");
+		usb_free_urb(urb);
+		goto nomem;
+	}
+
+	msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE];
+
+	msg->msg.can_msg.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
+	msg->msg.can_msg.length = cf->can_dlc;
+
+	if (cf->can_id & CAN_RTR_FLAG) {
+		msg->type = cf->can_id & CAN_EFF_FLAG ?
+			CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME;
+
+		msg->length = CPC_CAN_MSG_MIN_SIZE;
+	} else {
+		msg->type = cf->can_id & CAN_EFF_FLAG ?
+			CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME;
+
+		for (i = 0; i < cf->can_dlc; i++)
+			msg->msg.can_msg.msg[i] = cf->data[i];
+
+		msg->length = CPC_CAN_MSG_MIN_SIZE + cf->can_dlc;
+	}
+
+	for (i = 0; i < MAX_TX_URBS; i++) {
+		if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) {
+			context = &dev->tx_contexts[i];
+			break;
+		}
+	}
+
+	/*
+	 * May never happen! When this happens we'd more URBs in flight as
+	 * allowed (MAX_TX_URBS).
+	 */
+	if (!context) {
+		usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
+		usb_free_urb(urb);
+
+		netdev_warn(netdev, "couldn't find free context\n");
+
+		return NETDEV_TX_BUSY;
+	}
+
+	context->dev = dev;
+	context->echo_index = i;
+	context->dlc = cf->can_dlc;
+
+	usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
+			  size, ems_usb_write_bulk_callback, context);
+	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+	usb_anchor_urb(urb, &dev->tx_submitted);
+
+	can_put_echo_skb(skb, netdev, context->echo_index);
+
+	atomic_inc(&dev->active_tx_urbs);
+
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+	if (unlikely(err)) {
+		can_free_echo_skb(netdev, context->echo_index);
+
+		usb_unanchor_urb(urb);
+		usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
+		dev_kfree_skb(skb);
+
+		atomic_dec(&dev->active_tx_urbs);
+
+		if (err == -ENODEV) {
+			netif_device_detach(netdev);
+		} else {
+			netdev_warn(netdev, "failed tx_urb %d\n", err);
+
+			stats->tx_dropped++;
+		}
+	} else {
+		netdev->trans_start = jiffies;
+
+		/* Slow down tx path */
+		if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS ||
+		    dev->free_slots < 5) {
+			netif_stop_queue(netdev);
+		}
+	}
+
+	/*
+	 * Release our reference to this URB, the USB core will eventually free
+	 * it entirely.
+	 */
+	usb_free_urb(urb);
+
+	return NETDEV_TX_OK;
+
+nomem:
+	dev_kfree_skb(skb);
+	stats->tx_dropped++;
+
+	return NETDEV_TX_OK;
+}
+
+static int ems_usb_close(struct net_device *netdev)
+{
+	struct ems_usb *dev = netdev_priv(netdev);
+
+	/* Stop polling */
+	unlink_all_urbs(dev);
+
+	netif_stop_queue(netdev);
+
+	/* Set CAN controller to reset mode */
+	if (ems_usb_write_mode(dev, SJA1000_MOD_RM))
+		netdev_warn(netdev, "couldn't stop device");
+
+	close_candev(netdev);
+
+	return 0;
+}
+
+static const struct net_device_ops ems_usb_netdev_ops = {
+	.ndo_open = ems_usb_open,
+	.ndo_stop = ems_usb_close,
+	.ndo_start_xmit = ems_usb_start_xmit,
+	.ndo_change_mtu = can_change_mtu,
+};
+
+static const struct can_bittiming_const ems_usb_bittiming_const = {
+	.name = "ems_usb",
+	.tseg1_min = 1,
+	.tseg1_max = 16,
+	.tseg2_min = 1,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 64,
+	.brp_inc = 1,
+};
+
+static int ems_usb_set_mode(struct net_device *netdev, enum can_mode mode)
+{
+	struct ems_usb *dev = netdev_priv(netdev);
+
+	switch (mode) {
+	case CAN_MODE_START:
+		if (ems_usb_write_mode(dev, SJA1000_MOD_NORMAL))
+			netdev_warn(netdev, "couldn't start device");
+
+		if (netif_queue_stopped(netdev))
+			netif_wake_queue(netdev);
+		break;
+
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int ems_usb_set_bittiming(struct net_device *netdev)
+{
+	struct ems_usb *dev = netdev_priv(netdev);
+	struct can_bittiming *bt = &dev->can.bittiming;
+	u8 btr0, btr1;
+
+	btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
+	btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
+		(((bt->phase_seg2 - 1) & 0x7) << 4);
+	if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
+		btr1 |= 0x80;
+
+	netdev_info(netdev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
+
+	dev->active_params.msg.can_params.cc_params.sja1000.btr0 = btr0;
+	dev->active_params.msg.can_params.cc_params.sja1000.btr1 = btr1;
+
+	return ems_usb_command_msg(dev, &dev->active_params);
+}
+
+static void init_params_sja1000(struct ems_cpc_msg *msg)
+{
+	struct cpc_sja1000_params *sja1000 =
+		&msg->msg.can_params.cc_params.sja1000;
+
+	msg->type = CPC_CMD_TYPE_CAN_PARAMS;
+	msg->length = sizeof(struct cpc_can_params);
+	msg->msgid = 0;
+
+	msg->msg.can_params.cc_type = CPC_CC_TYPE_SJA1000;
+
+	/* Acceptance filter open */
+	sja1000->acc_code0 = 0x00;
+	sja1000->acc_code1 = 0x00;
+	sja1000->acc_code2 = 0x00;
+	sja1000->acc_code3 = 0x00;
+
+	/* Acceptance filter open */
+	sja1000->acc_mask0 = 0xFF;
+	sja1000->acc_mask1 = 0xFF;
+	sja1000->acc_mask2 = 0xFF;
+	sja1000->acc_mask3 = 0xFF;
+
+	sja1000->btr0 = 0;
+	sja1000->btr1 = 0;
+
+	sja1000->outp_contr = SJA1000_DEFAULT_OUTPUT_CONTROL;
+	sja1000->mode = SJA1000_MOD_RM;
+}
+
+/*
+ * probe function for new CPC-USB devices
+ */
+static int ems_usb_probe(struct usb_interface *intf,
+			 const struct usb_device_id *id)
+{
+	struct net_device *netdev;
+	struct ems_usb *dev;
+	int i, err = -ENOMEM;
+
+	netdev = alloc_candev(sizeof(struct ems_usb), MAX_TX_URBS);
+	if (!netdev) {
+		dev_err(&intf->dev, "ems_usb: Couldn't alloc candev\n");
+		return -ENOMEM;
+	}
+
+	dev = netdev_priv(netdev);
+
+	dev->udev = interface_to_usbdev(intf);
+	dev->netdev = netdev;
+
+	dev->can.state = CAN_STATE_STOPPED;
+	dev->can.clock.freq = EMS_USB_ARM7_CLOCK;
+	dev->can.bittiming_const = &ems_usb_bittiming_const;
+	dev->can.do_set_bittiming = ems_usb_set_bittiming;
+	dev->can.do_set_mode = ems_usb_set_mode;
+	dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
+
+	netdev->netdev_ops = &ems_usb_netdev_ops;
+
+	netdev->flags |= IFF_ECHO; /* we support local echo */
+
+	init_usb_anchor(&dev->rx_submitted);
+
+	init_usb_anchor(&dev->tx_submitted);
+	atomic_set(&dev->active_tx_urbs, 0);
+
+	for (i = 0; i < MAX_TX_URBS; i++)
+		dev->tx_contexts[i].echo_index = MAX_TX_URBS;
+
+	dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!dev->intr_urb) {
+		dev_err(&intf->dev, "Couldn't alloc intr URB\n");
+		goto cleanup_candev;
+	}
+
+	dev->intr_in_buffer = kzalloc(INTR_IN_BUFFER_SIZE, GFP_KERNEL);
+	if (!dev->intr_in_buffer)
+		goto cleanup_intr_urb;
+
+	dev->tx_msg_buffer = kzalloc(CPC_HEADER_SIZE +
+				     sizeof(struct ems_cpc_msg), GFP_KERNEL);
+	if (!dev->tx_msg_buffer)
+		goto cleanup_intr_in_buffer;
+
+	usb_set_intfdata(intf, dev);
+
+	SET_NETDEV_DEV(netdev, &intf->dev);
+
+	init_params_sja1000(&dev->active_params);
+
+	err = ems_usb_command_msg(dev, &dev->active_params);
+	if (err) {
+		netdev_err(netdev, "couldn't initialize controller: %d\n", err);
+		goto cleanup_tx_msg_buffer;
+	}
+
+	err = register_candev(netdev);
+	if (err) {
+		netdev_err(netdev, "couldn't register CAN device: %d\n", err);
+		goto cleanup_tx_msg_buffer;
+	}
+
+	return 0;
+
+cleanup_tx_msg_buffer:
+	kfree(dev->tx_msg_buffer);
+
+cleanup_intr_in_buffer:
+	kfree(dev->intr_in_buffer);
+
+cleanup_intr_urb:
+	usb_free_urb(dev->intr_urb);
+
+cleanup_candev:
+	free_candev(netdev);
+
+	return err;
+}
+
+/*
+ * called by the usb core when the device is removed from the system
+ */
+static void ems_usb_disconnect(struct usb_interface *intf)
+{
+	struct ems_usb *dev = usb_get_intfdata(intf);
+
+	usb_set_intfdata(intf, NULL);
+
+	if (dev) {
+		unregister_netdev(dev->netdev);
+		free_candev(dev->netdev);
+
+		unlink_all_urbs(dev);
+
+		usb_free_urb(dev->intr_urb);
+
+		kfree(dev->intr_in_buffer);
+	}
+}
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver ems_usb_driver = {
+	.name = "ems_usb",
+	.probe = ems_usb_probe,
+	.disconnect = ems_usb_disconnect,
+	.id_table = ems_usb_table,
+};
+
+module_usb_driver(ems_usb_driver);
diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c
new file mode 100644
index 000000000..411c1af92
--- /dev/null
+++ b/drivers/net/can/usb/esd_usb2.c
@@ -0,0 +1,1157 @@
+/*
+ * CAN driver for esd CAN-USB/2 and CAN-USB/Micro
+ *
+ * Copyright (C) 2010-2012 Matthias Fuchs <matthias.fuchs@esd.eu>, esd 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; version 2 of the License.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>");
+MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 and CAN-USB/Micro interfaces");
+MODULE_LICENSE("GPL v2");
+
+/* Define these values to match your devices */
+#define USB_ESDGMBH_VENDOR_ID	0x0ab4
+#define USB_CANUSB2_PRODUCT_ID	0x0010
+#define USB_CANUSBM_PRODUCT_ID	0x0011
+
+#define ESD_USB2_CAN_CLOCK	60000000
+#define ESD_USBM_CAN_CLOCK	36000000
+#define ESD_USB2_MAX_NETS	2
+
+/* USB2 commands */
+#define CMD_VERSION		1 /* also used for VERSION_REPLY */
+#define CMD_CAN_RX		2 /* device to host only */
+#define CMD_CAN_TX		3 /* also used for TX_DONE */
+#define CMD_SETBAUD		4 /* also used for SETBAUD_REPLY */
+#define CMD_TS			5 /* also used for TS_REPLY */
+#define CMD_IDADD		6 /* also used for IDADD_REPLY */
+
+/* esd CAN message flags - dlc field */
+#define ESD_RTR			0x10
+
+/* esd CAN message flags - id field */
+#define ESD_EXTID		0x20000000
+#define ESD_EVENT		0x40000000
+#define ESD_IDMASK		0x1fffffff
+
+/* esd CAN event ids used by this driver */
+#define ESD_EV_CAN_ERROR_EXT	2
+
+/* baudrate message flags */
+#define ESD_USB2_UBR		0x80000000
+#define ESD_USB2_LOM		0x40000000
+#define ESD_USB2_NO_BAUDRATE	0x7fffffff
+#define ESD_USB2_TSEG1_MIN	1
+#define ESD_USB2_TSEG1_MAX	16
+#define ESD_USB2_TSEG1_SHIFT	16
+#define ESD_USB2_TSEG2_MIN	1
+#define ESD_USB2_TSEG2_MAX	8
+#define ESD_USB2_TSEG2_SHIFT	20
+#define ESD_USB2_SJW_MAX	4
+#define ESD_USB2_SJW_SHIFT	14
+#define ESD_USBM_SJW_SHIFT	24
+#define ESD_USB2_BRP_MIN	1
+#define ESD_USB2_BRP_MAX	1024
+#define ESD_USB2_BRP_INC	1
+#define ESD_USB2_3_SAMPLES	0x00800000
+
+/* esd IDADD message */
+#define ESD_ID_ENABLE		0x80
+#define ESD_MAX_ID_SEGMENT	64
+
+/* SJA1000 ECC register (emulated by usb2 firmware) */
+#define SJA1000_ECC_SEG		0x1F
+#define SJA1000_ECC_DIR		0x20
+#define SJA1000_ECC_ERR		0x06
+#define SJA1000_ECC_BIT		0x00
+#define SJA1000_ECC_FORM	0x40
+#define SJA1000_ECC_STUFF	0x80
+#define SJA1000_ECC_MASK	0xc0
+
+/* esd bus state event codes */
+#define ESD_BUSSTATE_MASK	0xc0
+#define ESD_BUSSTATE_WARN	0x40
+#define ESD_BUSSTATE_ERRPASSIVE	0x80
+#define ESD_BUSSTATE_BUSOFF	0xc0
+
+#define RX_BUFFER_SIZE		1024
+#define MAX_RX_URBS		4
+#define MAX_TX_URBS		16 /* must be power of 2 */
+
+struct header_msg {
+	u8 len; /* len is always the total message length in 32bit words */
+	u8 cmd;
+	u8 rsvd[2];
+};
+
+struct version_msg {
+	u8 len;
+	u8 cmd;
+	u8 rsvd;
+	u8 flags;
+	__le32 drv_version;
+};
+
+struct version_reply_msg {
+	u8 len;
+	u8 cmd;
+	u8 nets;
+	u8 features;
+	__le32 version;
+	u8 name[16];
+	__le32 rsvd;
+	__le32 ts;
+};
+
+struct rx_msg {
+	u8 len;
+	u8 cmd;
+	u8 net;
+	u8 dlc;
+	__le32 ts;
+	__le32 id; /* upper 3 bits contain flags */
+	u8 data[8];
+};
+
+struct tx_msg {
+	u8 len;
+	u8 cmd;
+	u8 net;
+	u8 dlc;
+	u32 hnd;	/* opaque handle, not used by device */
+	__le32 id; /* upper 3 bits contain flags */
+	u8 data[8];
+};
+
+struct tx_done_msg {
+	u8 len;
+	u8 cmd;
+	u8 net;
+	u8 status;
+	u32 hnd;	/* opaque handle, not used by device */
+	__le32 ts;
+};
+
+struct id_filter_msg {
+	u8 len;
+	u8 cmd;
+	u8 net;
+	u8 option;
+	__le32 mask[ESD_MAX_ID_SEGMENT + 1];
+};
+
+struct set_baudrate_msg {
+	u8 len;
+	u8 cmd;
+	u8 net;
+	u8 rsvd;
+	__le32 baud;
+};
+
+/* Main message type used between library and application */
+struct __attribute__ ((packed)) esd_usb2_msg {
+	union {
+		struct header_msg hdr;
+		struct version_msg version;
+		struct version_reply_msg version_reply;
+		struct rx_msg rx;
+		struct tx_msg tx;
+		struct tx_done_msg txdone;
+		struct set_baudrate_msg setbaud;
+		struct id_filter_msg filter;
+	} msg;
+};
+
+static struct usb_device_id esd_usb2_table[] = {
+	{USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)},
+	{USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)},
+	{}
+};
+MODULE_DEVICE_TABLE(usb, esd_usb2_table);
+
+struct esd_usb2_net_priv;
+
+struct esd_tx_urb_context {
+	struct esd_usb2_net_priv *priv;
+	u32 echo_index;
+	int dlc;
+};
+
+struct esd_usb2 {
+	struct usb_device *udev;
+	struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS];
+
+	struct usb_anchor rx_submitted;
+
+	int net_count;
+	u32 version;
+	int rxinitdone;
+};
+
+struct esd_usb2_net_priv {
+	struct can_priv can; /* must be the first member */
+
+	atomic_t active_tx_jobs;
+	struct usb_anchor tx_submitted;
+	struct esd_tx_urb_context tx_contexts[MAX_TX_URBS];
+
+	struct esd_usb2 *usb2;
+	struct net_device *netdev;
+	int index;
+	u8 old_state;
+	struct can_berr_counter bec;
+};
+
+static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
+			      struct esd_usb2_msg *msg)
+{
+	struct net_device_stats *stats = &priv->netdev->stats;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
+
+	if (id == ESD_EV_CAN_ERROR_EXT) {
+		u8 state = msg->msg.rx.data[0];
+		u8 ecc = msg->msg.rx.data[1];
+		u8 txerr = msg->msg.rx.data[2];
+		u8 rxerr = msg->msg.rx.data[3];
+
+		skb = alloc_can_err_skb(priv->netdev, &cf);
+		if (skb == NULL) {
+			stats->rx_dropped++;
+			return;
+		}
+
+		if (state != priv->old_state) {
+			priv->old_state = state;
+
+			switch (state & ESD_BUSSTATE_MASK) {
+			case ESD_BUSSTATE_BUSOFF:
+				priv->can.state = CAN_STATE_BUS_OFF;
+				cf->can_id |= CAN_ERR_BUSOFF;
+				priv->can.can_stats.bus_off++;
+				can_bus_off(priv->netdev);
+				break;
+			case ESD_BUSSTATE_WARN:
+				priv->can.state = CAN_STATE_ERROR_WARNING;
+				priv->can.can_stats.error_warning++;
+				break;
+			case ESD_BUSSTATE_ERRPASSIVE:
+				priv->can.state = CAN_STATE_ERROR_PASSIVE;
+				priv->can.can_stats.error_passive++;
+				break;
+			default:
+				priv->can.state = CAN_STATE_ERROR_ACTIVE;
+				break;
+			}
+		} else {
+			priv->can.can_stats.bus_error++;
+			stats->rx_errors++;
+
+			cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+
+			switch (ecc & SJA1000_ECC_MASK) {
+			case SJA1000_ECC_BIT:
+				cf->data[2] |= CAN_ERR_PROT_BIT;
+				break;
+			case SJA1000_ECC_FORM:
+				cf->data[2] |= CAN_ERR_PROT_FORM;
+				break;
+			case SJA1000_ECC_STUFF:
+				cf->data[2] |= CAN_ERR_PROT_STUFF;
+				break;
+			default:
+				cf->data[2] |= CAN_ERR_PROT_UNSPEC;
+				cf->data[3] = ecc & SJA1000_ECC_SEG;
+				break;
+			}
+
+			/* Error occurred during transmission? */
+			if (!(ecc & SJA1000_ECC_DIR))
+				cf->data[2] |= CAN_ERR_PROT_TX;
+
+			if (priv->can.state == CAN_STATE_ERROR_WARNING ||
+			    priv->can.state == CAN_STATE_ERROR_PASSIVE) {
+				cf->data[1] = (txerr > rxerr) ?
+					CAN_ERR_CRTL_TX_PASSIVE :
+					CAN_ERR_CRTL_RX_PASSIVE;
+			}
+			cf->data[6] = txerr;
+			cf->data[7] = rxerr;
+		}
+
+		netif_rx(skb);
+
+		priv->bec.txerr = txerr;
+		priv->bec.rxerr = rxerr;
+
+		stats->rx_packets++;
+		stats->rx_bytes += cf->can_dlc;
+	}
+}
+
+static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
+				struct esd_usb2_msg *msg)
+{
+	struct net_device_stats *stats = &priv->netdev->stats;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	int i;
+	u32 id;
+
+	if (!netif_device_present(priv->netdev))
+		return;
+
+	id = le32_to_cpu(msg->msg.rx.id);
+
+	if (id & ESD_EVENT) {
+		esd_usb2_rx_event(priv, msg);
+	} else {
+		skb = alloc_can_skb(priv->netdev, &cf);
+		if (skb == NULL) {
+			stats->rx_dropped++;
+			return;
+		}
+
+		cf->can_id = id & ESD_IDMASK;
+		cf->can_dlc = get_can_dlc(msg->msg.rx.dlc);
+
+		if (id & ESD_EXTID)
+			cf->can_id |= CAN_EFF_FLAG;
+
+		if (msg->msg.rx.dlc & ESD_RTR) {
+			cf->can_id |= CAN_RTR_FLAG;
+		} else {
+			for (i = 0; i < cf->can_dlc; i++)
+				cf->data[i] = msg->msg.rx.data[i];
+		}
+
+		netif_rx(skb);
+
+		stats->rx_packets++;
+		stats->rx_bytes += cf->can_dlc;
+	}
+
+	return;
+}
+
+static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv,
+				 struct esd_usb2_msg *msg)
+{
+	struct net_device_stats *stats = &priv->netdev->stats;
+	struct net_device *netdev = priv->netdev;
+	struct esd_tx_urb_context *context;
+
+	if (!netif_device_present(netdev))
+		return;
+
+	context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)];
+
+	if (!msg->msg.txdone.status) {
+		stats->tx_packets++;
+		stats->tx_bytes += context->dlc;
+		can_get_echo_skb(netdev, context->echo_index);
+	} else {
+		stats->tx_errors++;
+		can_free_echo_skb(netdev, context->echo_index);
+	}
+
+	/* Release context */
+	context->echo_index = MAX_TX_URBS;
+	atomic_dec(&priv->active_tx_jobs);
+
+	netif_wake_queue(netdev);
+}
+
+static void esd_usb2_read_bulk_callback(struct urb *urb)
+{
+	struct esd_usb2 *dev = urb->context;
+	int retval;
+	int pos = 0;
+	int i;
+
+	switch (urb->status) {
+	case 0: /* success */
+		break;
+
+	case -ENOENT:
+	case -ESHUTDOWN:
+		return;
+
+	default:
+		dev_info(dev->udev->dev.parent,
+			 "Rx URB aborted (%d)\n", urb->status);
+		goto resubmit_urb;
+	}
+
+	while (pos < urb->actual_length) {
+		struct esd_usb2_msg *msg;
+
+		msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
+
+		switch (msg->msg.hdr.cmd) {
+		case CMD_CAN_RX:
+			if (msg->msg.rx.net >= dev->net_count) {
+				dev_err(dev->udev->dev.parent, "format error\n");
+				break;
+			}
+
+			esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
+			break;
+
+		case CMD_CAN_TX:
+			if (msg->msg.txdone.net >= dev->net_count) {
+				dev_err(dev->udev->dev.parent, "format error\n");
+				break;
+			}
+
+			esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
+					     msg);
+			break;
+		}
+
+		pos += msg->msg.hdr.len << 2;
+
+		if (pos > urb->actual_length) {
+			dev_err(dev->udev->dev.parent, "format error\n");
+			break;
+		}
+	}
+
+resubmit_urb:
+	usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
+			  urb->transfer_buffer, RX_BUFFER_SIZE,
+			  esd_usb2_read_bulk_callback, dev);
+
+	retval = usb_submit_urb(urb, GFP_ATOMIC);
+	if (retval == -ENODEV) {
+		for (i = 0; i < dev->net_count; i++) {
+			if (dev->nets[i])
+				netif_device_detach(dev->nets[i]->netdev);
+		}
+	} else if (retval) {
+		dev_err(dev->udev->dev.parent,
+			"failed resubmitting read bulk urb: %d\n", retval);
+	}
+
+	return;
+}
+
+/*
+ * callback for bulk IN urb
+ */
+static void esd_usb2_write_bulk_callback(struct urb *urb)
+{
+	struct esd_tx_urb_context *context = urb->context;
+	struct esd_usb2_net_priv *priv;
+	struct net_device *netdev;
+	size_t size = sizeof(struct esd_usb2_msg);
+
+	WARN_ON(!context);
+
+	priv = context->priv;
+	netdev = priv->netdev;
+
+	/* free up our allocated buffer */
+	usb_free_coherent(urb->dev, size,
+			  urb->transfer_buffer, urb->transfer_dma);
+
+	if (!netif_device_present(netdev))
+		return;
+
+	if (urb->status)
+		netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
+
+	netdev->trans_start = jiffies;
+}
+
+static ssize_t show_firmware(struct device *d,
+			     struct device_attribute *attr, char *buf)
+{
+	struct usb_interface *intf = to_usb_interface(d);
+	struct esd_usb2 *dev = usb_get_intfdata(intf);
+
+	return sprintf(buf, "%d.%d.%d\n",
+		       (dev->version >> 12) & 0xf,
+		       (dev->version >> 8) & 0xf,
+		       dev->version & 0xff);
+}
+static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
+
+static ssize_t show_hardware(struct device *d,
+			     struct device_attribute *attr, char *buf)
+{
+	struct usb_interface *intf = to_usb_interface(d);
+	struct esd_usb2 *dev = usb_get_intfdata(intf);
+
+	return sprintf(buf, "%d.%d.%d\n",
+		       (dev->version >> 28) & 0xf,
+		       (dev->version >> 24) & 0xf,
+		       (dev->version >> 16) & 0xff);
+}
+static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL);
+
+static ssize_t show_nets(struct device *d,
+			 struct device_attribute *attr, char *buf)
+{
+	struct usb_interface *intf = to_usb_interface(d);
+	struct esd_usb2 *dev = usb_get_intfdata(intf);
+
+	return sprintf(buf, "%d", dev->net_count);
+}
+static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL);
+
+static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg)
+{
+	int actual_length;
+
+	return usb_bulk_msg(dev->udev,
+			    usb_sndbulkpipe(dev->udev, 2),
+			    msg,
+			    msg->msg.hdr.len << 2,
+			    &actual_length,
+			    1000);
+}
+
+static int esd_usb2_wait_msg(struct esd_usb2 *dev,
+			     struct esd_usb2_msg *msg)
+{
+	int actual_length;
+
+	return usb_bulk_msg(dev->udev,
+			    usb_rcvbulkpipe(dev->udev, 1),
+			    msg,
+			    sizeof(*msg),
+			    &actual_length,
+			    1000);
+}
+
+static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev)
+{
+	int i, err = 0;
+
+	if (dev->rxinitdone)
+		return 0;
+
+	for (i = 0; i < MAX_RX_URBS; i++) {
+		struct urb *urb = NULL;
+		u8 *buf = NULL;
+
+		/* create a URB, and a buffer for it */
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!urb) {
+			dev_warn(dev->udev->dev.parent,
+				 "No memory left for URBs\n");
+			err = -ENOMEM;
+			break;
+		}
+
+		buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
+					 &urb->transfer_dma);
+		if (!buf) {
+			dev_warn(dev->udev->dev.parent,
+				 "No memory left for USB buffer\n");
+			err = -ENOMEM;
+			goto freeurb;
+		}
+
+		usb_fill_bulk_urb(urb, dev->udev,
+				  usb_rcvbulkpipe(dev->udev, 1),
+				  buf, RX_BUFFER_SIZE,
+				  esd_usb2_read_bulk_callback, dev);
+		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+		usb_anchor_urb(urb, &dev->rx_submitted);
+
+		err = usb_submit_urb(urb, GFP_KERNEL);
+		if (err) {
+			usb_unanchor_urb(urb);
+			usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
+					  urb->transfer_dma);
+		}
+
+freeurb:
+		/* Drop reference, USB core will take care of freeing it */
+		usb_free_urb(urb);
+		if (err)
+			break;
+	}
+
+	/* Did we submit any URBs */
+	if (i == 0) {
+		dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n");
+		return err;
+	}
+
+	/* Warn if we've couldn't transmit all the URBs */
+	if (i < MAX_RX_URBS) {
+		dev_warn(dev->udev->dev.parent,
+			 "rx performance may be slow\n");
+	}
+
+	dev->rxinitdone = 1;
+	return 0;
+}
+
+/*
+ * Start interface
+ */
+static int esd_usb2_start(struct esd_usb2_net_priv *priv)
+{
+	struct esd_usb2 *dev = priv->usb2;
+	struct net_device *netdev = priv->netdev;
+	struct esd_usb2_msg *msg;
+	int err, i;
+
+	msg = kmalloc(sizeof(*msg), GFP_KERNEL);
+	if (!msg) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	/*
+	 * Enable all IDs
+	 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits).
+	 * Each bit represents one 11 bit CAN identifier. A set bit
+	 * enables reception of the corresponding CAN identifier. A cleared
+	 * bit disabled this identifier. An additional bitmask value
+	 * following the CAN 2.0A bits is used to enable reception of
+	 * extended CAN frames. Only the LSB of this final mask is checked
+	 * for the complete 29 bit ID range. The IDADD message also allows
+	 * filter configuration for an ID subset. In this case you can add
+	 * the number of the starting bitmask (0..64) to the filter.option
+	 * field followed by only some bitmasks.
+	 */
+	msg->msg.hdr.cmd = CMD_IDADD;
+	msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
+	msg->msg.filter.net = priv->index;
+	msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
+	for (i = 0; i < ESD_MAX_ID_SEGMENT; i++)
+		msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff);
+	/* enable 29bit extended IDs */
+	msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001);
+
+	err = esd_usb2_send_msg(dev, msg);
+	if (err)
+		goto out;
+
+	err = esd_usb2_setup_rx_urbs(dev);
+	if (err)
+		goto out;
+
+	priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+out:
+	if (err == -ENODEV)
+		netif_device_detach(netdev);
+	if (err)
+		netdev_err(netdev, "couldn't start device: %d\n", err);
+
+	kfree(msg);
+	return err;
+}
+
+static void unlink_all_urbs(struct esd_usb2 *dev)
+{
+	struct esd_usb2_net_priv *priv;
+	int i, j;
+
+	usb_kill_anchored_urbs(&dev->rx_submitted);
+	for (i = 0; i < dev->net_count; i++) {
+		priv = dev->nets[i];
+		if (priv) {
+			usb_kill_anchored_urbs(&priv->tx_submitted);
+			atomic_set(&priv->active_tx_jobs, 0);
+
+			for (j = 0; j < MAX_TX_URBS; j++)
+				priv->tx_contexts[j].echo_index = MAX_TX_URBS;
+		}
+	}
+}
+
+static int esd_usb2_open(struct net_device *netdev)
+{
+	struct esd_usb2_net_priv *priv = netdev_priv(netdev);
+	int err;
+
+	/* common open */
+	err = open_candev(netdev);
+	if (err)
+		return err;
+
+	/* finally start device */
+	err = esd_usb2_start(priv);
+	if (err) {
+		netdev_warn(netdev, "couldn't start device: %d\n", err);
+		close_candev(netdev);
+		return err;
+	}
+
+	netif_start_queue(netdev);
+
+	return 0;
+}
+
+static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
+				      struct net_device *netdev)
+{
+	struct esd_usb2_net_priv *priv = netdev_priv(netdev);
+	struct esd_usb2 *dev = priv->usb2;
+	struct esd_tx_urb_context *context = NULL;
+	struct net_device_stats *stats = &netdev->stats;
+	struct can_frame *cf = (struct can_frame *)skb->data;
+	struct esd_usb2_msg *msg;
+	struct urb *urb;
+	u8 *buf;
+	int i, err;
+	int ret = NETDEV_TX_OK;
+	size_t size = sizeof(struct esd_usb2_msg);
+
+	if (can_dropped_invalid_skb(netdev, skb))
+		return NETDEV_TX_OK;
+
+	/* create a URB, and a buffer for it, and copy the data to the URB */
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!urb) {
+		netdev_err(netdev, "No memory left for URBs\n");
+		stats->tx_dropped++;
+		dev_kfree_skb(skb);
+		goto nourbmem;
+	}
+
+	buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
+				 &urb->transfer_dma);
+	if (!buf) {
+		netdev_err(netdev, "No memory left for USB buffer\n");
+		stats->tx_dropped++;
+		dev_kfree_skb(skb);
+		goto nobufmem;
+	}
+
+	msg = (struct esd_usb2_msg *)buf;
+
+	msg->msg.hdr.len = 3; /* minimal length */
+	msg->msg.hdr.cmd = CMD_CAN_TX;
+	msg->msg.tx.net = priv->index;
+	msg->msg.tx.dlc = cf->can_dlc;
+	msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
+
+	if (cf->can_id & CAN_RTR_FLAG)
+		msg->msg.tx.dlc |= ESD_RTR;
+
+	if (cf->can_id & CAN_EFF_FLAG)
+		msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
+
+	for (i = 0; i < cf->can_dlc; i++)
+		msg->msg.tx.data[i] = cf->data[i];
+
+	msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
+
+	for (i = 0; i < MAX_TX_URBS; i++) {
+		if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
+			context = &priv->tx_contexts[i];
+			break;
+		}
+	}
+
+	/*
+	 * This may never happen.
+	 */
+	if (!context) {
+		netdev_warn(netdev, "couldn't find free context\n");
+		ret = NETDEV_TX_BUSY;
+		goto releasebuf;
+	}
+
+	context->priv = priv;
+	context->echo_index = i;
+	context->dlc = cf->can_dlc;
+
+	/* hnd must not be 0 - MSB is stripped in txdone handling */
+	msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
+
+	usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
+			  msg->msg.hdr.len << 2,
+			  esd_usb2_write_bulk_callback, context);
+
+	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+	usb_anchor_urb(urb, &priv->tx_submitted);
+
+	can_put_echo_skb(skb, netdev, context->echo_index);
+
+	atomic_inc(&priv->active_tx_jobs);
+
+	/* Slow down tx path */
+	if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
+		netif_stop_queue(netdev);
+
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+	if (err) {
+		can_free_echo_skb(netdev, context->echo_index);
+
+		atomic_dec(&priv->active_tx_jobs);
+		usb_unanchor_urb(urb);
+
+		stats->tx_dropped++;
+
+		if (err == -ENODEV)
+			netif_device_detach(netdev);
+		else
+			netdev_warn(netdev, "failed tx_urb %d\n", err);
+
+		goto releasebuf;
+	}
+
+	netdev->trans_start = jiffies;
+
+	/*
+	 * Release our reference to this URB, the USB core will eventually free
+	 * it entirely.
+	 */
+	usb_free_urb(urb);
+
+	return NETDEV_TX_OK;
+
+releasebuf:
+	usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
+
+nobufmem:
+	usb_free_urb(urb);
+
+nourbmem:
+	return ret;
+}
+
+static int esd_usb2_close(struct net_device *netdev)
+{
+	struct esd_usb2_net_priv *priv = netdev_priv(netdev);
+	struct esd_usb2_msg *msg;
+	int i;
+
+	msg = kmalloc(sizeof(*msg), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	/* Disable all IDs (see esd_usb2_start()) */
+	msg->msg.hdr.cmd = CMD_IDADD;
+	msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
+	msg->msg.filter.net = priv->index;
+	msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
+	for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
+		msg->msg.filter.mask[i] = 0;
+	if (esd_usb2_send_msg(priv->usb2, msg) < 0)
+		netdev_err(netdev, "sending idadd message failed\n");
+
+	/* set CAN controller to reset mode */
+	msg->msg.hdr.len = 2;
+	msg->msg.hdr.cmd = CMD_SETBAUD;
+	msg->msg.setbaud.net = priv->index;
+	msg->msg.setbaud.rsvd = 0;
+	msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
+	if (esd_usb2_send_msg(priv->usb2, msg) < 0)
+		netdev_err(netdev, "sending setbaud message failed\n");
+
+	priv->can.state = CAN_STATE_STOPPED;
+
+	netif_stop_queue(netdev);
+
+	close_candev(netdev);
+
+	kfree(msg);
+
+	return 0;
+}
+
+static const struct net_device_ops esd_usb2_netdev_ops = {
+	.ndo_open = esd_usb2_open,
+	.ndo_stop = esd_usb2_close,
+	.ndo_start_xmit = esd_usb2_start_xmit,
+	.ndo_change_mtu = can_change_mtu,
+};
+
+static const struct can_bittiming_const esd_usb2_bittiming_const = {
+	.name = "esd_usb2",
+	.tseg1_min = ESD_USB2_TSEG1_MIN,
+	.tseg1_max = ESD_USB2_TSEG1_MAX,
+	.tseg2_min = ESD_USB2_TSEG2_MIN,
+	.tseg2_max = ESD_USB2_TSEG2_MAX,
+	.sjw_max = ESD_USB2_SJW_MAX,
+	.brp_min = ESD_USB2_BRP_MIN,
+	.brp_max = ESD_USB2_BRP_MAX,
+	.brp_inc = ESD_USB2_BRP_INC,
+};
+
+static int esd_usb2_set_bittiming(struct net_device *netdev)
+{
+	struct esd_usb2_net_priv *priv = netdev_priv(netdev);
+	struct can_bittiming *bt = &priv->can.bittiming;
+	struct esd_usb2_msg *msg;
+	int err;
+	u32 canbtr;
+	int sjw_shift;
+
+	canbtr = ESD_USB2_UBR;
+	if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
+		canbtr |= ESD_USB2_LOM;
+
+	canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
+
+	if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) ==
+	    USB_CANUSBM_PRODUCT_ID)
+		sjw_shift = ESD_USBM_SJW_SHIFT;
+	else
+		sjw_shift = ESD_USB2_SJW_SHIFT;
+
+	canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
+		<< sjw_shift;
+	canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
+		   & (ESD_USB2_TSEG1_MAX - 1))
+		<< ESD_USB2_TSEG1_SHIFT;
+	canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
+		<< ESD_USB2_TSEG2_SHIFT;
+	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
+		canbtr |= ESD_USB2_3_SAMPLES;
+
+	msg = kmalloc(sizeof(*msg), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	msg->msg.hdr.len = 2;
+	msg->msg.hdr.cmd = CMD_SETBAUD;
+	msg->msg.setbaud.net = priv->index;
+	msg->msg.setbaud.rsvd = 0;
+	msg->msg.setbaud.baud = cpu_to_le32(canbtr);
+
+	netdev_info(netdev, "setting BTR=%#x\n", canbtr);
+
+	err = esd_usb2_send_msg(priv->usb2, msg);
+
+	kfree(msg);
+	return err;
+}
+
+static int esd_usb2_get_berr_counter(const struct net_device *netdev,
+				     struct can_berr_counter *bec)
+{
+	struct esd_usb2_net_priv *priv = netdev_priv(netdev);
+
+	bec->txerr = priv->bec.txerr;
+	bec->rxerr = priv->bec.rxerr;
+
+	return 0;
+}
+
+static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
+{
+	switch (mode) {
+	case CAN_MODE_START:
+		netif_wake_queue(netdev);
+		break;
+
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
+{
+	struct esd_usb2 *dev = usb_get_intfdata(intf);
+	struct net_device *netdev;
+	struct esd_usb2_net_priv *priv;
+	int err = 0;
+	int i;
+
+	netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
+	if (!netdev) {
+		dev_err(&intf->dev, "couldn't alloc candev\n");
+		err = -ENOMEM;
+		goto done;
+	}
+
+	priv = netdev_priv(netdev);
+
+	init_usb_anchor(&priv->tx_submitted);
+	atomic_set(&priv->active_tx_jobs, 0);
+
+	for (i = 0; i < MAX_TX_URBS; i++)
+		priv->tx_contexts[i].echo_index = MAX_TX_URBS;
+
+	priv->usb2 = dev;
+	priv->netdev = netdev;
+	priv->index = index;
+
+	priv->can.state = CAN_STATE_STOPPED;
+	priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
+
+	if (le16_to_cpu(dev->udev->descriptor.idProduct) ==
+	    USB_CANUSBM_PRODUCT_ID)
+		priv->can.clock.freq = ESD_USBM_CAN_CLOCK;
+	else {
+		priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
+		priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
+	}
+
+	priv->can.bittiming_const = &esd_usb2_bittiming_const;
+	priv->can.do_set_bittiming = esd_usb2_set_bittiming;
+	priv->can.do_set_mode = esd_usb2_set_mode;
+	priv->can.do_get_berr_counter = esd_usb2_get_berr_counter;
+
+	netdev->flags |= IFF_ECHO; /* we support local echo */
+
+	netdev->netdev_ops = &esd_usb2_netdev_ops;
+
+	SET_NETDEV_DEV(netdev, &intf->dev);
+	netdev->dev_id = index;
+
+	err = register_candev(netdev);
+	if (err) {
+		dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
+		free_candev(netdev);
+		err = -ENOMEM;
+		goto done;
+	}
+
+	dev->nets[index] = priv;
+	netdev_info(netdev, "device %s registered\n", netdev->name);
+
+done:
+	return err;
+}
+
+/*
+ * probe function for new USB2 devices
+ *
+ * check version information and number of available
+ * CAN interfaces
+ */
+static int esd_usb2_probe(struct usb_interface *intf,
+			 const struct usb_device_id *id)
+{
+	struct esd_usb2 *dev;
+	struct esd_usb2_msg *msg;
+	int i, err;
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev) {
+		err = -ENOMEM;
+		goto done;
+	}
+
+	dev->udev = interface_to_usbdev(intf);
+
+	init_usb_anchor(&dev->rx_submitted);
+
+	usb_set_intfdata(intf, dev);
+
+	msg = kmalloc(sizeof(*msg), GFP_KERNEL);
+	if (!msg) {
+		err = -ENOMEM;
+		goto free_msg;
+	}
+
+	/* query number of CAN interfaces (nets) */
+	msg->msg.hdr.cmd = CMD_VERSION;
+	msg->msg.hdr.len = 2;
+	msg->msg.version.rsvd = 0;
+	msg->msg.version.flags = 0;
+	msg->msg.version.drv_version = 0;
+
+	err = esd_usb2_send_msg(dev, msg);
+	if (err < 0) {
+		dev_err(&intf->dev, "sending version message failed\n");
+		goto free_msg;
+	}
+
+	err = esd_usb2_wait_msg(dev, msg);
+	if (err < 0) {
+		dev_err(&intf->dev, "no version message answer\n");
+		goto free_msg;
+	}
+
+	dev->net_count = (int)msg->msg.version_reply.nets;
+	dev->version = le32_to_cpu(msg->msg.version_reply.version);
+
+	if (device_create_file(&intf->dev, &dev_attr_firmware))
+		dev_err(&intf->dev,
+			"Couldn't create device file for firmware\n");
+
+	if (device_create_file(&intf->dev, &dev_attr_hardware))
+		dev_err(&intf->dev,
+			"Couldn't create device file for hardware\n");
+
+	if (device_create_file(&intf->dev, &dev_attr_nets))
+		dev_err(&intf->dev,
+			"Couldn't create device file for nets\n");
+
+	/* do per device probing */
+	for (i = 0; i < dev->net_count; i++)
+		esd_usb2_probe_one_net(intf, i);
+
+free_msg:
+	kfree(msg);
+	if (err)
+		kfree(dev);
+done:
+	return err;
+}
+
+/*
+ * called by the usb core when the device is removed from the system
+ */
+static void esd_usb2_disconnect(struct usb_interface *intf)
+{
+	struct esd_usb2 *dev = usb_get_intfdata(intf);
+	struct net_device *netdev;
+	int i;
+
+	device_remove_file(&intf->dev, &dev_attr_firmware);
+	device_remove_file(&intf->dev, &dev_attr_hardware);
+	device_remove_file(&intf->dev, &dev_attr_nets);
+
+	usb_set_intfdata(intf, NULL);
+
+	if (dev) {
+		for (i = 0; i < dev->net_count; i++) {
+			if (dev->nets[i]) {
+				netdev = dev->nets[i]->netdev;
+				unregister_netdev(netdev);
+				free_candev(netdev);
+			}
+		}
+		unlink_all_urbs(dev);
+		kfree(dev);
+	}
+}
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver esd_usb2_driver = {
+	.name = "esd_usb2",
+	.probe = esd_usb2_probe,
+	.disconnect = esd_usb2_disconnect,
+	.id_table = esd_usb2_table,
+};
+
+module_usb_driver(esd_usb2_driver);
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
new file mode 100644
index 000000000..8b4d3e687
--- /dev/null
+++ b/drivers/net/can/usb/gs_usb.c
@@ -0,0 +1,974 @@
+/* CAN driver for Geschwister Schneider USB/CAN devices.
+ *
+ * Copyright (C) 2013 Geschwister Schneider Technologie-,
+ * Entwicklungs- und Vertriebs UG (Haftungsbeschränkt).
+ *
+ * Many thanks to all socketcan devs!
+ *
+ * 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 of the License.
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/signal.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+/* Device specific constants */
+#define USB_GSUSB_1_VENDOR_ID      0x1d50
+#define USB_GSUSB_1_PRODUCT_ID     0x606f
+
+#define GSUSB_ENDPOINT_IN          1
+#define GSUSB_ENDPOINT_OUT         2
+
+/* Device specific constants */
+enum gs_usb_breq {
+	GS_USB_BREQ_HOST_FORMAT = 0,
+	GS_USB_BREQ_BITTIMING,
+	GS_USB_BREQ_MODE,
+	GS_USB_BREQ_BERR,
+	GS_USB_BREQ_BT_CONST,
+	GS_USB_BREQ_DEVICE_CONFIG
+};
+
+enum gs_can_mode {
+	/* reset a channel. turns it off */
+	GS_CAN_MODE_RESET = 0,
+	/* starts a channel */
+	GS_CAN_MODE_START
+};
+
+enum gs_can_state {
+	GS_CAN_STATE_ERROR_ACTIVE = 0,
+	GS_CAN_STATE_ERROR_WARNING,
+	GS_CAN_STATE_ERROR_PASSIVE,
+	GS_CAN_STATE_BUS_OFF,
+	GS_CAN_STATE_STOPPED,
+	GS_CAN_STATE_SLEEPING
+};
+
+/* data types passed between host and device */
+struct gs_host_config {
+	u32 byte_order;
+} __packed;
+/* All data exchanged between host and device is exchanged in host byte order,
+ * thanks to the struct gs_host_config byte_order member, which is sent first
+ * to indicate the desired byte order.
+ */
+
+struct gs_device_config {
+	u8 reserved1;
+	u8 reserved2;
+	u8 reserved3;
+	u8 icount;
+	u32 sw_version;
+	u32 hw_version;
+} __packed;
+
+#define GS_CAN_MODE_NORMAL               0
+#define GS_CAN_MODE_LISTEN_ONLY          (1<<0)
+#define GS_CAN_MODE_LOOP_BACK            (1<<1)
+#define GS_CAN_MODE_TRIPLE_SAMPLE        (1<<2)
+#define GS_CAN_MODE_ONE_SHOT             (1<<3)
+
+struct gs_device_mode {
+	u32 mode;
+	u32 flags;
+} __packed;
+
+struct gs_device_state {
+	u32 state;
+	u32 rxerr;
+	u32 txerr;
+} __packed;
+
+struct gs_device_bittiming {
+	u32 prop_seg;
+	u32 phase_seg1;
+	u32 phase_seg2;
+	u32 sjw;
+	u32 brp;
+} __packed;
+
+#define GS_CAN_FEATURE_LISTEN_ONLY      (1<<0)
+#define GS_CAN_FEATURE_LOOP_BACK        (1<<1)
+#define GS_CAN_FEATURE_TRIPLE_SAMPLE    (1<<2)
+#define GS_CAN_FEATURE_ONE_SHOT         (1<<3)
+
+struct gs_device_bt_const {
+	u32 feature;
+	u32 fclk_can;
+	u32 tseg1_min;
+	u32 tseg1_max;
+	u32 tseg2_min;
+	u32 tseg2_max;
+	u32 sjw_max;
+	u32 brp_min;
+	u32 brp_max;
+	u32 brp_inc;
+} __packed;
+
+#define GS_CAN_FLAG_OVERFLOW 1
+
+struct gs_host_frame {
+	u32 echo_id;
+	u32 can_id;
+
+	u8 can_dlc;
+	u8 channel;
+	u8 flags;
+	u8 reserved;
+
+	u8 data[8];
+} __packed;
+/* The GS USB devices make use of the same flags and masks as in
+ * linux/can.h and linux/can/error.h, and no additional mapping is necessary.
+ */
+
+/* Only send a max of GS_MAX_TX_URBS frames per channel at a time. */
+#define GS_MAX_TX_URBS 10
+/* Only launch a max of GS_MAX_RX_URBS usb requests at a time. */
+#define GS_MAX_RX_URBS 30
+/* Maximum number of interfaces the driver supports per device.
+ * Current hardware only supports 2 interfaces. The future may vary.
+ */
+#define GS_MAX_INTF 2
+
+struct gs_tx_context {
+	struct gs_can *dev;
+	unsigned int echo_id;
+};
+
+struct gs_can {
+	struct can_priv can; /* must be the first member */
+
+	struct gs_usb *parent;
+
+	struct net_device *netdev;
+	struct usb_device *udev;
+	struct usb_interface *iface;
+
+	struct can_bittiming_const bt_const;
+	unsigned int channel;	/* channel number */
+
+	/* This lock prevents a race condition between xmit and recieve. */
+	spinlock_t tx_ctx_lock;
+	struct gs_tx_context tx_context[GS_MAX_TX_URBS];
+
+	struct usb_anchor tx_submitted;
+	atomic_t active_tx_urbs;
+};
+
+/* usb interface struct */
+struct gs_usb {
+	struct gs_can *canch[GS_MAX_INTF];
+	struct usb_anchor rx_submitted;
+	atomic_t active_channels;
+	struct usb_device *udev;
+};
+
+/* 'allocate' a tx context.
+ * returns a valid tx context or NULL if there is no space.
+ */
+static struct gs_tx_context *gs_alloc_tx_context(struct gs_can *dev)
+{
+	int i = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->tx_ctx_lock, flags);
+
+	for (; i < GS_MAX_TX_URBS; i++) {
+		if (dev->tx_context[i].echo_id == GS_MAX_TX_URBS) {
+			dev->tx_context[i].echo_id = i;
+			spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
+			return &dev->tx_context[i];
+		}
+	}
+
+	spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
+	return NULL;
+}
+
+/* releases a tx context
+ */
+static void gs_free_tx_context(struct gs_tx_context *txc)
+{
+	txc->echo_id = GS_MAX_TX_URBS;
+}
+
+/* Get a tx context by id.
+ */
+static struct gs_tx_context *gs_get_tx_context(struct gs_can *dev, unsigned int id)
+{
+	unsigned long flags;
+
+	if (id < GS_MAX_TX_URBS) {
+		spin_lock_irqsave(&dev->tx_ctx_lock, flags);
+		if (dev->tx_context[id].echo_id == id) {
+			spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
+			return &dev->tx_context[id];
+		}
+		spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
+	}
+	return NULL;
+}
+
+static int gs_cmd_reset(struct gs_usb *gsusb, struct gs_can *gsdev)
+{
+	struct gs_device_mode *dm;
+	struct usb_interface *intf = gsdev->iface;
+	int rc;
+
+	dm = kzalloc(sizeof(*dm), GFP_KERNEL);
+	if (!dm)
+		return -ENOMEM;
+
+	dm->mode = GS_CAN_MODE_RESET;
+
+	rc = usb_control_msg(interface_to_usbdev(intf),
+			     usb_sndctrlpipe(interface_to_usbdev(intf), 0),
+			     GS_USB_BREQ_MODE,
+			     USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
+			     gsdev->channel,
+			     0,
+			     dm,
+			     sizeof(*dm),
+			     1000);
+
+	return rc;
+}
+
+static void gs_update_state(struct gs_can *dev, struct can_frame *cf)
+{
+	struct can_device_stats *can_stats = &dev->can.can_stats;
+
+	if (cf->can_id & CAN_ERR_RESTARTED) {
+		dev->can.state = CAN_STATE_ERROR_ACTIVE;
+		can_stats->restarts++;
+	} else if (cf->can_id & CAN_ERR_BUSOFF) {
+		dev->can.state = CAN_STATE_BUS_OFF;
+		can_stats->bus_off++;
+	} else if (cf->can_id & CAN_ERR_CRTL) {
+		if ((cf->data[1] & CAN_ERR_CRTL_TX_WARNING) ||
+		    (cf->data[1] & CAN_ERR_CRTL_RX_WARNING)) {
+			dev->can.state = CAN_STATE_ERROR_WARNING;
+			can_stats->error_warning++;
+		} else if ((cf->data[1] & CAN_ERR_CRTL_TX_PASSIVE) ||
+			   (cf->data[1] & CAN_ERR_CRTL_RX_PASSIVE)) {
+			dev->can.state = CAN_STATE_ERROR_PASSIVE;
+			can_stats->error_passive++;
+		} else {
+			dev->can.state = CAN_STATE_ERROR_ACTIVE;
+		}
+	}
+}
+
+static void gs_usb_recieve_bulk_callback(struct urb *urb)
+{
+	struct gs_usb *usbcan = urb->context;
+	struct gs_can *dev;
+	struct net_device *netdev;
+	int rc;
+	struct net_device_stats *stats;
+	struct gs_host_frame *hf = urb->transfer_buffer;
+	struct gs_tx_context *txc;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+
+	BUG_ON(!usbcan);
+
+	switch (urb->status) {
+	case 0: /* success */
+		break;
+	case -ENOENT:
+	case -ESHUTDOWN:
+		return;
+	default:
+		/* do not resubmit aborted urbs. eg: when device goes down */
+		return;
+	}
+
+	/* device reports out of range channel id */
+	if (hf->channel >= GS_MAX_INTF)
+		goto resubmit_urb;
+
+	dev = usbcan->canch[hf->channel];
+
+	netdev = dev->netdev;
+	stats = &netdev->stats;
+
+	if (!netif_device_present(netdev))
+		return;
+
+	if (hf->echo_id == -1) { /* normal rx */
+		skb = alloc_can_skb(dev->netdev, &cf);
+		if (!skb)
+			return;
+
+		cf->can_id = hf->can_id;
+
+		cf->can_dlc = get_can_dlc(hf->can_dlc);
+		memcpy(cf->data, hf->data, 8);
+
+		/* ERROR frames tell us information about the controller */
+		if (hf->can_id & CAN_ERR_FLAG)
+			gs_update_state(dev, cf);
+
+		netdev->stats.rx_packets++;
+		netdev->stats.rx_bytes += hf->can_dlc;
+
+		netif_rx(skb);
+	} else { /* echo_id == hf->echo_id */
+		if (hf->echo_id >= GS_MAX_TX_URBS) {
+			netdev_err(netdev,
+				   "Unexpected out of range echo id %d\n",
+				   hf->echo_id);
+			goto resubmit_urb;
+		}
+
+		netdev->stats.tx_packets++;
+		netdev->stats.tx_bytes += hf->can_dlc;
+
+		txc = gs_get_tx_context(dev, hf->echo_id);
+
+		/* bad devices send bad echo_ids. */
+		if (!txc) {
+			netdev_err(netdev,
+				   "Unexpected unused echo id %d\n",
+				   hf->echo_id);
+			goto resubmit_urb;
+		}
+
+		can_get_echo_skb(netdev, hf->echo_id);
+
+		gs_free_tx_context(txc);
+
+		netif_wake_queue(netdev);
+	}
+
+	if (hf->flags & GS_CAN_FLAG_OVERFLOW) {
+		skb = alloc_can_err_skb(netdev, &cf);
+		if (!skb)
+			goto resubmit_urb;
+
+		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_dlc = CAN_ERR_DLC;
+		cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
+		stats->rx_over_errors++;
+		stats->rx_errors++;
+		netif_rx(skb);
+	}
+
+ resubmit_urb:
+	usb_fill_bulk_urb(urb,
+			  usbcan->udev,
+			  usb_rcvbulkpipe(usbcan->udev, GSUSB_ENDPOINT_IN),
+			  hf,
+			  sizeof(struct gs_host_frame),
+			  gs_usb_recieve_bulk_callback,
+			  usbcan
+			  );
+
+	rc = usb_submit_urb(urb, GFP_ATOMIC);
+
+	/* USB failure take down all interfaces */
+	if (rc == -ENODEV) {
+		for (rc = 0; rc < GS_MAX_INTF; rc++) {
+			if (usbcan->canch[rc])
+				netif_device_detach(usbcan->canch[rc]->netdev);
+		}
+	}
+}
+
+static int gs_usb_set_bittiming(struct net_device *netdev)
+{
+	struct gs_can *dev = netdev_priv(netdev);
+	struct can_bittiming *bt = &dev->can.bittiming;
+	struct usb_interface *intf = dev->iface;
+	int rc;
+	struct gs_device_bittiming *dbt;
+
+	dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
+	if (!dbt)
+		return -ENOMEM;
+
+	dbt->prop_seg = bt->prop_seg;
+	dbt->phase_seg1 = bt->phase_seg1;
+	dbt->phase_seg2 = bt->phase_seg2;
+	dbt->sjw = bt->sjw;
+	dbt->brp = bt->brp;
+
+	/* request bit timings */
+	rc = usb_control_msg(interface_to_usbdev(intf),
+			     usb_sndctrlpipe(interface_to_usbdev(intf), 0),
+			     GS_USB_BREQ_BITTIMING,
+			     USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
+			     dev->channel,
+			     0,
+			     dbt,
+			     sizeof(*dbt),
+			     1000);
+
+	kfree(dbt);
+
+	if (rc < 0)
+		dev_err(netdev->dev.parent, "Couldn't set bittimings (err=%d)",
+			rc);
+
+	return rc;
+}
+
+static void gs_usb_xmit_callback(struct urb *urb)
+{
+	struct gs_tx_context *txc = urb->context;
+	struct gs_can *dev = txc->dev;
+	struct net_device *netdev = dev->netdev;
+
+	if (urb->status)
+		netdev_info(netdev, "usb xmit fail %d\n", txc->echo_id);
+
+	usb_free_coherent(urb->dev,
+			  urb->transfer_buffer_length,
+			  urb->transfer_buffer,
+			  urb->transfer_dma);
+
+	atomic_dec(&dev->active_tx_urbs);
+
+	if (!netif_device_present(netdev))
+		return;
+
+	if (netif_queue_stopped(netdev))
+		netif_wake_queue(netdev);
+}
+
+static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct gs_can *dev = netdev_priv(netdev);
+	struct net_device_stats *stats = &dev->netdev->stats;
+	struct urb *urb;
+	struct gs_host_frame *hf;
+	struct can_frame *cf;
+	int rc;
+	unsigned int idx;
+	struct gs_tx_context *txc;
+
+	if (can_dropped_invalid_skb(netdev, skb))
+		return NETDEV_TX_OK;
+
+	/* find an empty context to keep track of transmission */
+	txc = gs_alloc_tx_context(dev);
+	if (!txc)
+		return NETDEV_TX_BUSY;
+
+	/* create a URB, and a buffer for it */
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!urb) {
+		netdev_err(netdev, "No memory left for URB\n");
+		goto nomem_urb;
+	}
+
+	hf = usb_alloc_coherent(dev->udev, sizeof(*hf), GFP_ATOMIC,
+				&urb->transfer_dma);
+	if (!hf) {
+		netdev_err(netdev, "No memory left for USB buffer\n");
+		goto nomem_hf;
+	}
+
+	idx = txc->echo_id;
+
+	if (idx >= GS_MAX_TX_URBS) {
+		netdev_err(netdev, "Invalid tx context %d\n", idx);
+		goto badidx;
+	}
+
+	hf->echo_id = idx;
+	hf->channel = dev->channel;
+
+	cf = (struct can_frame *)skb->data;
+
+	hf->can_id = cf->can_id;
+	hf->can_dlc = cf->can_dlc;
+	memcpy(hf->data, cf->data, cf->can_dlc);
+
+	usb_fill_bulk_urb(urb, dev->udev,
+			  usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
+			  hf,
+			  sizeof(*hf),
+			  gs_usb_xmit_callback,
+			  txc);
+
+	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+	usb_anchor_urb(urb, &dev->tx_submitted);
+
+	can_put_echo_skb(skb, netdev, idx);
+
+	atomic_inc(&dev->active_tx_urbs);
+
+	rc = usb_submit_urb(urb, GFP_ATOMIC);
+	if (unlikely(rc)) {			/* usb send failed */
+		atomic_dec(&dev->active_tx_urbs);
+
+		can_free_echo_skb(netdev, idx);
+		gs_free_tx_context(txc);
+
+		usb_unanchor_urb(urb);
+		usb_free_coherent(dev->udev,
+				  sizeof(*hf),
+				  hf,
+				  urb->transfer_dma);
+
+
+		if (rc == -ENODEV) {
+			netif_device_detach(netdev);
+		} else {
+			netdev_err(netdev, "usb_submit failed (err=%d)\n", rc);
+			stats->tx_dropped++;
+		}
+	} else {
+		/* Slow down tx path */
+		if (atomic_read(&dev->active_tx_urbs) >= GS_MAX_TX_URBS)
+			netif_stop_queue(netdev);
+	}
+
+	/* let usb core take care of this urb */
+	usb_free_urb(urb);
+
+	return NETDEV_TX_OK;
+
+ badidx:
+	usb_free_coherent(dev->udev,
+			  sizeof(*hf),
+			  hf,
+			  urb->transfer_dma);
+ nomem_hf:
+	usb_free_urb(urb);
+
+ nomem_urb:
+	gs_free_tx_context(txc);
+	dev_kfree_skb(skb);
+	stats->tx_dropped++;
+	return NETDEV_TX_OK;
+}
+
+static int gs_can_open(struct net_device *netdev)
+{
+	struct gs_can *dev = netdev_priv(netdev);
+	struct gs_usb *parent = dev->parent;
+	int rc, i;
+	struct gs_device_mode *dm;
+	u32 ctrlmode;
+
+	rc = open_candev(netdev);
+	if (rc)
+		return rc;
+
+	if (atomic_add_return(1, &parent->active_channels) == 1) {
+		for (i = 0; i < GS_MAX_RX_URBS; i++) {
+			struct urb *urb;
+			u8 *buf;
+
+			/* alloc rx urb */
+			urb = usb_alloc_urb(0, GFP_KERNEL);
+			if (!urb) {
+				netdev_err(netdev,
+					   "No memory left for URB\n");
+				return -ENOMEM;
+			}
+
+			/* alloc rx buffer */
+			buf = usb_alloc_coherent(dev->udev,
+						 sizeof(struct gs_host_frame),
+						 GFP_KERNEL,
+						 &urb->transfer_dma);
+			if (!buf) {
+				netdev_err(netdev,
+					   "No memory left for USB buffer\n");
+				usb_free_urb(urb);
+				return -ENOMEM;
+			}
+
+			/* fill, anchor, and submit rx urb */
+			usb_fill_bulk_urb(urb,
+					  dev->udev,
+					  usb_rcvbulkpipe(dev->udev,
+							  GSUSB_ENDPOINT_IN),
+					  buf,
+					  sizeof(struct gs_host_frame),
+					  gs_usb_recieve_bulk_callback,
+					  parent);
+			urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+			usb_anchor_urb(urb, &parent->rx_submitted);
+
+			rc = usb_submit_urb(urb, GFP_KERNEL);
+			if (rc) {
+				if (rc == -ENODEV)
+					netif_device_detach(dev->netdev);
+
+				netdev_err(netdev,
+					   "usb_submit failed (err=%d)\n",
+					   rc);
+
+				usb_unanchor_urb(urb);
+				break;
+			}
+
+			/* Drop reference,
+			 * USB core will take care of freeing it
+			 */
+			usb_free_urb(urb);
+		}
+	}
+
+	dm = kmalloc(sizeof(*dm), GFP_KERNEL);
+	if (!dm)
+		return -ENOMEM;
+
+	/* flags */
+	ctrlmode = dev->can.ctrlmode;
+	dm->flags = 0;
+
+	if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
+		dm->flags |= GS_CAN_MODE_LOOP_BACK;
+	else if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
+		dm->flags |= GS_CAN_MODE_LISTEN_ONLY;
+
+	/* Controller is not allowed to retry TX
+	 * this mode is unavailable on atmels uc3c hardware
+	 */
+	if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
+		dm->flags |= GS_CAN_MODE_ONE_SHOT;
+
+	if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
+		dm->flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
+
+	/* finally start device */
+	dm->mode = GS_CAN_MODE_START;
+	rc = usb_control_msg(interface_to_usbdev(dev->iface),
+			     usb_sndctrlpipe(interface_to_usbdev(dev->iface), 0),
+			     GS_USB_BREQ_MODE,
+			     USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
+			     dev->channel,
+			     0,
+			     dm,
+			     sizeof(*dm),
+			     1000);
+
+	if (rc < 0) {
+		netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
+		kfree(dm);
+		return rc;
+	}
+
+	kfree(dm);
+
+	dev->can.state = CAN_STATE_ERROR_ACTIVE;
+
+	if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
+		netif_start_queue(netdev);
+
+	return 0;
+}
+
+static int gs_can_close(struct net_device *netdev)
+{
+	int rc;
+	struct gs_can *dev = netdev_priv(netdev);
+	struct gs_usb *parent = dev->parent;
+
+	netif_stop_queue(netdev);
+
+	/* Stop polling */
+	if (atomic_dec_and_test(&parent->active_channels))
+		usb_kill_anchored_urbs(&parent->rx_submitted);
+
+	/* Stop sending URBs */
+	usb_kill_anchored_urbs(&dev->tx_submitted);
+	atomic_set(&dev->active_tx_urbs, 0);
+
+	/* reset the device */
+	rc = gs_cmd_reset(parent, dev);
+	if (rc < 0)
+		netdev_warn(netdev, "Couldn't shutdown device (err=%d)", rc);
+
+	/* reset tx contexts */
+	for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
+		dev->tx_context[rc].dev = dev;
+		dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
+	}
+
+	/* close the netdev */
+	close_candev(netdev);
+
+	return 0;
+}
+
+static const struct net_device_ops gs_usb_netdev_ops = {
+	.ndo_open = gs_can_open,
+	.ndo_stop = gs_can_close,
+	.ndo_start_xmit = gs_can_start_xmit,
+	.ndo_change_mtu = can_change_mtu,
+};
+
+static struct gs_can *gs_make_candev(unsigned int channel, struct usb_interface *intf)
+{
+	struct gs_can *dev;
+	struct net_device *netdev;
+	int rc;
+	struct gs_device_bt_const *bt_const;
+
+	bt_const = kmalloc(sizeof(*bt_const), GFP_KERNEL);
+	if (!bt_const)
+		return ERR_PTR(-ENOMEM);
+
+	/* fetch bit timing constants */
+	rc = usb_control_msg(interface_to_usbdev(intf),
+			     usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
+			     GS_USB_BREQ_BT_CONST,
+			     USB_DIR_IN|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
+			     channel,
+			     0,
+			     bt_const,
+			     sizeof(*bt_const),
+			     1000);
+
+	if (rc < 0) {
+		dev_err(&intf->dev,
+			"Couldn't get bit timing const for channel (err=%d)\n",
+			rc);
+		kfree(bt_const);
+		return ERR_PTR(rc);
+	}
+
+	/* create netdev */
+	netdev = alloc_candev(sizeof(struct gs_can), GS_MAX_TX_URBS);
+	if (!netdev) {
+		dev_err(&intf->dev, "Couldn't allocate candev\n");
+		kfree(bt_const);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	dev = netdev_priv(netdev);
+
+	netdev->netdev_ops = &gs_usb_netdev_ops;
+
+	netdev->flags |= IFF_ECHO; /* we support full roundtrip echo */
+
+	/* dev settup */
+	strcpy(dev->bt_const.name, "gs_usb");
+	dev->bt_const.tseg1_min = bt_const->tseg1_min;
+	dev->bt_const.tseg1_max = bt_const->tseg1_max;
+	dev->bt_const.tseg2_min = bt_const->tseg2_min;
+	dev->bt_const.tseg2_max = bt_const->tseg2_max;
+	dev->bt_const.sjw_max = bt_const->sjw_max;
+	dev->bt_const.brp_min = bt_const->brp_min;
+	dev->bt_const.brp_max = bt_const->brp_max;
+	dev->bt_const.brp_inc = bt_const->brp_inc;
+
+	dev->udev = interface_to_usbdev(intf);
+	dev->iface = intf;
+	dev->netdev = netdev;
+	dev->channel = channel;
+
+	init_usb_anchor(&dev->tx_submitted);
+	atomic_set(&dev->active_tx_urbs, 0);
+	spin_lock_init(&dev->tx_ctx_lock);
+	for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
+		dev->tx_context[rc].dev = dev;
+		dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
+	}
+
+	/* can settup */
+	dev->can.state = CAN_STATE_STOPPED;
+	dev->can.clock.freq = bt_const->fclk_can;
+	dev->can.bittiming_const = &dev->bt_const;
+	dev->can.do_set_bittiming = gs_usb_set_bittiming;
+
+	dev->can.ctrlmode_supported = 0;
+
+	if (bt_const->feature & GS_CAN_FEATURE_LISTEN_ONLY)
+		dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
+
+	if (bt_const->feature & GS_CAN_FEATURE_LOOP_BACK)
+		dev->can.ctrlmode_supported |= CAN_CTRLMODE_LOOPBACK;
+
+	if (bt_const->feature & GS_CAN_FEATURE_TRIPLE_SAMPLE)
+		dev->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
+
+	if (bt_const->feature & GS_CAN_FEATURE_ONE_SHOT)
+		dev->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
+
+	kfree(bt_const);
+
+	SET_NETDEV_DEV(netdev, &intf->dev);
+
+	rc = register_candev(dev->netdev);
+	if (rc) {
+		free_candev(dev->netdev);
+		dev_err(&intf->dev, "Couldn't register candev (err=%d)\n", rc);
+		return ERR_PTR(rc);
+	}
+
+	return dev;
+}
+
+static void gs_destroy_candev(struct gs_can *dev)
+{
+	unregister_candev(dev->netdev);
+	free_candev(dev->netdev);
+	usb_kill_anchored_urbs(&dev->tx_submitted);
+	kfree(dev);
+}
+
+static int gs_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
+{
+	struct gs_usb *dev;
+	int rc = -ENOMEM;
+	unsigned int icount, i;
+	struct gs_host_config *hconf;
+	struct gs_device_config *dconf;
+
+	hconf = kmalloc(sizeof(*hconf), GFP_KERNEL);
+	if (!hconf)
+		return -ENOMEM;
+
+	hconf->byte_order = 0x0000beef;
+
+	/* send host config */
+	rc = usb_control_msg(interface_to_usbdev(intf),
+			     usb_sndctrlpipe(interface_to_usbdev(intf), 0),
+			     GS_USB_BREQ_HOST_FORMAT,
+			     USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
+			     1,
+			     intf->altsetting[0].desc.bInterfaceNumber,
+			     hconf,
+			     sizeof(*hconf),
+			     1000);
+
+	kfree(hconf);
+
+	if (rc < 0) {
+		dev_err(&intf->dev, "Couldn't send data format (err=%d)\n",
+			rc);
+		return rc;
+	}
+
+	dconf = kmalloc(sizeof(*dconf), GFP_KERNEL);
+	if (!dconf)
+		return -ENOMEM;
+
+	/* read device config */
+	rc = usb_control_msg(interface_to_usbdev(intf),
+			     usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
+			     GS_USB_BREQ_DEVICE_CONFIG,
+			     USB_DIR_IN|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
+			     1,
+			     intf->altsetting[0].desc.bInterfaceNumber,
+			     dconf,
+			     sizeof(*dconf),
+			     1000);
+	if (rc < 0) {
+		dev_err(&intf->dev, "Couldn't get device config: (err=%d)\n",
+			rc);
+
+		kfree(dconf);
+
+		return rc;
+	}
+
+	icount = dconf->icount+1;
+
+	kfree(dconf);
+
+	dev_info(&intf->dev, "Configuring for %d interfaces\n", icount);
+
+	if (icount > GS_MAX_INTF) {
+		dev_err(&intf->dev,
+			"Driver cannot handle more that %d CAN interfaces\n",
+			GS_MAX_INTF);
+		return -EINVAL;
+	}
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+	init_usb_anchor(&dev->rx_submitted);
+
+	atomic_set(&dev->active_channels, 0);
+
+	usb_set_intfdata(intf, dev);
+	dev->udev = interface_to_usbdev(intf);
+
+	for (i = 0; i < icount; i++) {
+		dev->canch[i] = gs_make_candev(i, intf);
+		if (IS_ERR_OR_NULL(dev->canch[i])) {
+			/* on failure destroy previously created candevs */
+			icount = i;
+			for (i = 0; i < icount; i++) {
+				gs_destroy_candev(dev->canch[i]);
+				dev->canch[i] = NULL;
+			}
+			kfree(dev);
+			return rc;
+		}
+		dev->canch[i]->parent = dev;
+	}
+
+	return 0;
+}
+
+static void gs_usb_disconnect(struct usb_interface *intf)
+{
+	unsigned i;
+	struct gs_usb *dev = usb_get_intfdata(intf);
+	usb_set_intfdata(intf, NULL);
+
+	if (!dev) {
+		dev_err(&intf->dev, "Disconnect (nodata)\n");
+		return;
+	}
+
+	for (i = 0; i < GS_MAX_INTF; i++) {
+		struct gs_can *can = dev->canch[i];
+
+		if (!can)
+			continue;
+
+		gs_destroy_candev(can);
+	}
+
+	usb_kill_anchored_urbs(&dev->rx_submitted);
+}
+
+static const struct usb_device_id gs_usb_table[] = {
+	{USB_DEVICE(USB_GSUSB_1_VENDOR_ID, USB_GSUSB_1_PRODUCT_ID)},
+	{} /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, gs_usb_table);
+
+static struct usb_driver gs_usb_driver = {
+	.name       = "gs_usb",
+	.probe      = gs_usb_probe,
+	.disconnect = gs_usb_disconnect,
+	.id_table   = gs_usb_table,
+};
+
+module_usb_driver(gs_usb_driver);
+
+MODULE_AUTHOR("Maximilian Schneider <mws@schneidersoft.net>");
+MODULE_DESCRIPTION(
+"Socket CAN device driver for Geschwister Schneider Technologie-, "
+"Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces.");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
new file mode 100644
index 000000000..8b17a9065
--- /dev/null
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -0,0 +1,2073 @@
+/*
+ * 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.
+ *
+ * Parts of this driver are based on the following:
+ *  - Kvaser linux leaf driver (version 4.78)
+ *  - CAN driver for esd CAN-USB/2
+ *  - Kvaser linux usbcanII driver (version 5.3)
+ *
+ * Copyright (C) 2002-2006 KVASER AB, Sweden. All rights reserved.
+ * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
+ * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be>
+ * Copyright (C) 2015 Valeo S.A.
+ */
+
+#include <linux/spinlock.h>
+#include <linux/kernel.h>
+#include <linux/completion.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+#define MAX_RX_URBS			4
+#define START_TIMEOUT			1000 /* msecs */
+#define STOP_TIMEOUT			1000 /* msecs */
+#define USB_SEND_TIMEOUT		1000 /* msecs */
+#define USB_RECV_TIMEOUT		1000 /* msecs */
+#define RX_BUFFER_SIZE			3072
+#define CAN_USB_CLOCK			8000000
+#define MAX_NET_DEVICES			3
+#define MAX_USBCAN_NET_DEVICES		2
+
+/* Kvaser Leaf USB devices */
+#define KVASER_VENDOR_ID		0x0bfd
+#define USB_LEAF_DEVEL_PRODUCT_ID	10
+#define USB_LEAF_LITE_PRODUCT_ID	11
+#define USB_LEAF_PRO_PRODUCT_ID		12
+#define USB_LEAF_SPRO_PRODUCT_ID	14
+#define USB_LEAF_PRO_LS_PRODUCT_ID	15
+#define USB_LEAF_PRO_SWC_PRODUCT_ID	16
+#define USB_LEAF_PRO_LIN_PRODUCT_ID	17
+#define USB_LEAF_SPRO_LS_PRODUCT_ID	18
+#define USB_LEAF_SPRO_SWC_PRODUCT_ID	19
+#define USB_MEMO2_DEVEL_PRODUCT_ID	22
+#define USB_MEMO2_HSHS_PRODUCT_ID	23
+#define USB_UPRO_HSHS_PRODUCT_ID	24
+#define USB_LEAF_LITE_GI_PRODUCT_ID	25
+#define USB_LEAF_PRO_OBDII_PRODUCT_ID	26
+#define USB_MEMO2_HSLS_PRODUCT_ID	27
+#define USB_LEAF_LITE_CH_PRODUCT_ID	28
+#define USB_BLACKBIRD_SPRO_PRODUCT_ID	29
+#define USB_OEM_MERCURY_PRODUCT_ID	34
+#define USB_OEM_LEAF_PRODUCT_ID		35
+#define USB_CAN_R_PRODUCT_ID		39
+#define USB_LEAF_LITE_V2_PRODUCT_ID	288
+#define USB_MINI_PCIE_HS_PRODUCT_ID	289
+
+static inline bool kvaser_is_leaf(const struct usb_device_id *id)
+{
+	return id->idProduct >= USB_LEAF_DEVEL_PRODUCT_ID &&
+	       id->idProduct <= USB_MINI_PCIE_HS_PRODUCT_ID;
+}
+
+/* Kvaser USBCan-II devices */
+#define USB_USBCAN_REVB_PRODUCT_ID	2
+#define USB_VCI2_PRODUCT_ID		3
+#define USB_USBCAN2_PRODUCT_ID		4
+#define USB_MEMORATOR_PRODUCT_ID	5
+
+static inline bool kvaser_is_usbcan(const struct usb_device_id *id)
+{
+	return id->idProduct >= USB_USBCAN_REVB_PRODUCT_ID &&
+	       id->idProduct <= USB_MEMORATOR_PRODUCT_ID;
+}
+
+/* USB devices features */
+#define KVASER_HAS_SILENT_MODE		BIT(0)
+#define KVASER_HAS_TXRX_ERRORS		BIT(1)
+
+/* Message header size */
+#define MSG_HEADER_LEN			2
+
+/* Can message flags */
+#define MSG_FLAG_ERROR_FRAME		BIT(0)
+#define MSG_FLAG_OVERRUN		BIT(1)
+#define MSG_FLAG_NERR			BIT(2)
+#define MSG_FLAG_WAKEUP			BIT(3)
+#define MSG_FLAG_REMOTE_FRAME		BIT(4)
+#define MSG_FLAG_RESERVED		BIT(5)
+#define MSG_FLAG_TX_ACK			BIT(6)
+#define MSG_FLAG_TX_REQUEST		BIT(7)
+
+/* Can states (M16C CxSTRH register) */
+#define M16C_STATE_BUS_RESET		BIT(0)
+#define M16C_STATE_BUS_ERROR		BIT(4)
+#define M16C_STATE_BUS_PASSIVE		BIT(5)
+#define M16C_STATE_BUS_OFF		BIT(6)
+
+/* Can msg ids */
+#define CMD_RX_STD_MESSAGE		12
+#define CMD_TX_STD_MESSAGE		13
+#define CMD_RX_EXT_MESSAGE		14
+#define CMD_TX_EXT_MESSAGE		15
+#define CMD_SET_BUS_PARAMS		16
+#define CMD_GET_BUS_PARAMS		17
+#define CMD_GET_BUS_PARAMS_REPLY	18
+#define CMD_GET_CHIP_STATE		19
+#define CMD_CHIP_STATE_EVENT		20
+#define CMD_SET_CTRL_MODE		21
+#define CMD_GET_CTRL_MODE		22
+#define CMD_GET_CTRL_MODE_REPLY		23
+#define CMD_RESET_CHIP			24
+#define CMD_RESET_CARD			25
+#define CMD_START_CHIP			26
+#define CMD_START_CHIP_REPLY		27
+#define CMD_STOP_CHIP			28
+#define CMD_STOP_CHIP_REPLY		29
+
+#define CMD_LEAF_GET_CARD_INFO2		32
+#define CMD_USBCAN_RESET_CLOCK		32
+#define CMD_USBCAN_CLOCK_OVERFLOW_EVENT	33
+
+#define CMD_GET_CARD_INFO		34
+#define CMD_GET_CARD_INFO_REPLY		35
+#define CMD_GET_SOFTWARE_INFO		38
+#define CMD_GET_SOFTWARE_INFO_REPLY	39
+#define CMD_ERROR_EVENT			45
+#define CMD_FLUSH_QUEUE			48
+#define CMD_RESET_ERROR_COUNTER		49
+#define CMD_TX_ACKNOWLEDGE		50
+#define CMD_CAN_ERROR_EVENT		51
+
+#define CMD_LEAF_USB_THROTTLE		77
+#define CMD_LEAF_LOG_MESSAGE		106
+
+/* error factors */
+#define M16C_EF_ACKE			BIT(0)
+#define M16C_EF_CRCE			BIT(1)
+#define M16C_EF_FORME			BIT(2)
+#define M16C_EF_STFE			BIT(3)
+#define M16C_EF_BITE0			BIT(4)
+#define M16C_EF_BITE1			BIT(5)
+#define M16C_EF_RCVE			BIT(6)
+#define M16C_EF_TRE			BIT(7)
+
+/* Only Leaf-based devices can report M16C error factors,
+ * thus define our own error status flags for USBCANII
+ */
+#define USBCAN_ERROR_STATE_NONE		0
+#define USBCAN_ERROR_STATE_TX_ERROR	BIT(0)
+#define USBCAN_ERROR_STATE_RX_ERROR	BIT(1)
+#define USBCAN_ERROR_STATE_BUSERROR	BIT(2)
+
+/* bittiming parameters */
+#define KVASER_USB_TSEG1_MIN		1
+#define KVASER_USB_TSEG1_MAX		16
+#define KVASER_USB_TSEG2_MIN		1
+#define KVASER_USB_TSEG2_MAX		8
+#define KVASER_USB_SJW_MAX		4
+#define KVASER_USB_BRP_MIN		1
+#define KVASER_USB_BRP_MAX		64
+#define KVASER_USB_BRP_INC		1
+
+/* ctrl modes */
+#define KVASER_CTRL_MODE_NORMAL		1
+#define KVASER_CTRL_MODE_SILENT		2
+#define KVASER_CTRL_MODE_SELFRECEPTION	3
+#define KVASER_CTRL_MODE_OFF		4
+
+/* Extended CAN identifier flag */
+#define KVASER_EXTENDED_FRAME		BIT(31)
+
+/* Kvaser USB CAN dongles are divided into two major families:
+ * - Leaf: Based on Renesas M32C, running firmware labeled as 'filo'
+ * - UsbcanII: Based on Renesas M16C, running firmware labeled as 'helios'
+ */
+enum kvaser_usb_family {
+	KVASER_LEAF,
+	KVASER_USBCAN,
+};
+
+struct kvaser_msg_simple {
+	u8 tid;
+	u8 channel;
+} __packed;
+
+struct kvaser_msg_cardinfo {
+	u8 tid;
+	u8 nchannels;
+	union {
+		struct {
+			__le32 serial_number;
+			__le32 padding;
+		} __packed leaf0;
+		struct {
+			__le32 serial_number_low;
+			__le32 serial_number_high;
+		} __packed usbcan0;
+	} __packed;
+	__le32 clock_resolution;
+	__le32 mfgdate;
+	u8 ean[8];
+	u8 hw_revision;
+	union {
+		struct {
+			u8 usb_hs_mode;
+		} __packed leaf1;
+		struct {
+			u8 padding;
+		} __packed usbcan1;
+	} __packed;
+	__le16 padding;
+} __packed;
+
+struct kvaser_msg_cardinfo2 {
+	u8 tid;
+	u8 reserved;
+	u8 pcb_id[24];
+	__le32 oem_unlock_code;
+} __packed;
+
+struct leaf_msg_softinfo {
+	u8 tid;
+	u8 padding0;
+	__le32 sw_options;
+	__le32 fw_version;
+	__le16 max_outstanding_tx;
+	__le16 padding1[9];
+} __packed;
+
+struct usbcan_msg_softinfo {
+	u8 tid;
+	u8 fw_name[5];
+	__le16 max_outstanding_tx;
+	u8 padding[6];
+	__le32 fw_version;
+	__le16 checksum;
+	__le16 sw_options;
+} __packed;
+
+struct kvaser_msg_busparams {
+	u8 tid;
+	u8 channel;
+	__le32 bitrate;
+	u8 tseg1;
+	u8 tseg2;
+	u8 sjw;
+	u8 no_samp;
+} __packed;
+
+struct kvaser_msg_tx_can {
+	u8 channel;
+	u8 tid;
+	u8 msg[14];
+	union {
+		struct {
+			u8 padding;
+			u8 flags;
+		} __packed leaf;
+		struct {
+			u8 flags;
+			u8 padding;
+		} __packed usbcan;
+	} __packed;
+} __packed;
+
+struct kvaser_msg_rx_can_header {
+	u8 channel;
+	u8 flag;
+} __packed;
+
+struct leaf_msg_rx_can {
+	u8 channel;
+	u8 flag;
+
+	__le16 time[3];
+	u8 msg[14];
+} __packed;
+
+struct usbcan_msg_rx_can {
+	u8 channel;
+	u8 flag;
+
+	u8 msg[14];
+	__le16 time;
+} __packed;
+
+struct leaf_msg_chip_state_event {
+	u8 tid;
+	u8 channel;
+
+	__le16 time[3];
+	u8 tx_errors_count;
+	u8 rx_errors_count;
+
+	u8 status;
+	u8 padding[3];
+} __packed;
+
+struct usbcan_msg_chip_state_event {
+	u8 tid;
+	u8 channel;
+
+	u8 tx_errors_count;
+	u8 rx_errors_count;
+	__le16 time;
+
+	u8 status;
+	u8 padding[3];
+} __packed;
+
+struct kvaser_msg_tx_acknowledge_header {
+	u8 channel;
+	u8 tid;
+} __packed;
+
+struct leaf_msg_tx_acknowledge {
+	u8 channel;
+	u8 tid;
+
+	__le16 time[3];
+	u8 flags;
+	u8 time_offset;
+} __packed;
+
+struct usbcan_msg_tx_acknowledge {
+	u8 channel;
+	u8 tid;
+
+	__le16 time;
+	__le16 padding;
+} __packed;
+
+struct leaf_msg_error_event {
+	u8 tid;
+	u8 flags;
+	__le16 time[3];
+	u8 channel;
+	u8 padding;
+	u8 tx_errors_count;
+	u8 rx_errors_count;
+	u8 status;
+	u8 error_factor;
+} __packed;
+
+struct usbcan_msg_error_event {
+	u8 tid;
+	u8 padding;
+	u8 tx_errors_count_ch0;
+	u8 rx_errors_count_ch0;
+	u8 tx_errors_count_ch1;
+	u8 rx_errors_count_ch1;
+	u8 status_ch0;
+	u8 status_ch1;
+	__le16 time;
+} __packed;
+
+struct kvaser_msg_ctrl_mode {
+	u8 tid;
+	u8 channel;
+	u8 ctrl_mode;
+	u8 padding[3];
+} __packed;
+
+struct kvaser_msg_flush_queue {
+	u8 tid;
+	u8 channel;
+	u8 flags;
+	u8 padding[3];
+} __packed;
+
+struct leaf_msg_log_message {
+	u8 channel;
+	u8 flags;
+	__le16 time[3];
+	u8 dlc;
+	u8 time_offset;
+	__le32 id;
+	u8 data[8];
+} __packed;
+
+struct kvaser_msg {
+	u8 len;
+	u8 id;
+	union	{
+		struct kvaser_msg_simple simple;
+		struct kvaser_msg_cardinfo cardinfo;
+		struct kvaser_msg_cardinfo2 cardinfo2;
+		struct kvaser_msg_busparams busparams;
+
+		struct kvaser_msg_rx_can_header rx_can_header;
+		struct kvaser_msg_tx_acknowledge_header tx_acknowledge_header;
+
+		union {
+			struct leaf_msg_softinfo softinfo;
+			struct leaf_msg_rx_can rx_can;
+			struct leaf_msg_chip_state_event chip_state_event;
+			struct leaf_msg_tx_acknowledge tx_acknowledge;
+			struct leaf_msg_error_event error_event;
+			struct leaf_msg_log_message log_message;
+		} __packed leaf;
+
+		union {
+			struct usbcan_msg_softinfo softinfo;
+			struct usbcan_msg_rx_can rx_can;
+			struct usbcan_msg_chip_state_event chip_state_event;
+			struct usbcan_msg_tx_acknowledge tx_acknowledge;
+			struct usbcan_msg_error_event error_event;
+		} __packed usbcan;
+
+		struct kvaser_msg_tx_can tx_can;
+		struct kvaser_msg_ctrl_mode ctrl_mode;
+		struct kvaser_msg_flush_queue flush_queue;
+	} u;
+} __packed;
+
+/* Summary of a kvaser error event, for a unified Leaf/Usbcan error
+ * handling. Some discrepancies between the two families exist:
+ *
+ * - USBCAN firmware does not report M16C "error factors"
+ * - USBCAN controllers has difficulties reporting if the raised error
+ *   event is for ch0 or ch1. They leave such arbitration to the OS
+ *   driver by letting it compare error counters with previous values
+ *   and decide the error event's channel. Thus for USBCAN, the channel
+ *   field is only advisory.
+ */
+struct kvaser_usb_error_summary {
+	u8 channel, status, txerr, rxerr;
+	union {
+		struct {
+			u8 error_factor;
+		} leaf;
+		struct {
+			u8 other_ch_status;
+			u8 error_state;
+		} usbcan;
+	};
+};
+
+/* Context for an outstanding, not yet ACKed, transmission */
+struct kvaser_usb_tx_urb_context {
+	struct kvaser_usb_net_priv *priv;
+	u32 echo_index;
+	int dlc;
+};
+
+struct kvaser_usb {
+	struct usb_device *udev;
+	struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
+
+	struct usb_endpoint_descriptor *bulk_in, *bulk_out;
+	struct usb_anchor rx_submitted;
+
+	/* @max_tx_urbs: Firmware-reported maximum number of oustanding,
+	 * not yet ACKed, transmissions on this device. This value is
+	 * also used as a sentinel for marking free tx contexts.
+	 */
+	u32 fw_version;
+	unsigned int nchannels;
+	unsigned int max_tx_urbs;
+	enum kvaser_usb_family family;
+
+	bool rxinitdone;
+	void *rxbuf[MAX_RX_URBS];
+	dma_addr_t rxbuf_dma[MAX_RX_URBS];
+};
+
+struct kvaser_usb_net_priv {
+	struct can_priv can;
+	struct can_berr_counter bec;
+
+	struct kvaser_usb *dev;
+	struct net_device *netdev;
+	int channel;
+
+	struct completion start_comp, stop_comp;
+	struct usb_anchor tx_submitted;
+
+	spinlock_t tx_contexts_lock;
+	int active_tx_contexts;
+	struct kvaser_usb_tx_urb_context tx_contexts[];
+};
+
+static const struct usb_device_id kvaser_usb_table[] = {
+	/* Leaf family IDs */
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS |
+			       KVASER_HAS_SILENT_MODE },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS |
+			       KVASER_HAS_SILENT_MODE },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS |
+			       KVASER_HAS_SILENT_MODE },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS |
+			       KVASER_HAS_SILENT_MODE },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS |
+			       KVASER_HAS_SILENT_MODE },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS |
+			       KVASER_HAS_SILENT_MODE },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS |
+			       KVASER_HAS_SILENT_MODE },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS |
+			       KVASER_HAS_SILENT_MODE },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS |
+			       KVASER_HAS_SILENT_MODE },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS |
+			       KVASER_HAS_SILENT_MODE },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
+
+	/* USBCANII family IDs */
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS },
+	{ USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
+		.driver_info = KVASER_HAS_TXRX_ERRORS },
+
+	{ }
+};
+MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
+
+static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
+				      struct kvaser_msg *msg)
+{
+	int actual_len;
+
+	return usb_bulk_msg(dev->udev,
+			    usb_sndbulkpipe(dev->udev,
+					dev->bulk_out->bEndpointAddress),
+			    msg, msg->len, &actual_len,
+			    USB_SEND_TIMEOUT);
+}
+
+static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
+			       struct kvaser_msg *msg)
+{
+	struct kvaser_msg *tmp;
+	void *buf;
+	int actual_len;
+	int err;
+	int pos;
+	unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
+
+	buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	do {
+		err = usb_bulk_msg(dev->udev,
+				   usb_rcvbulkpipe(dev->udev,
+					dev->bulk_in->bEndpointAddress),
+				   buf, RX_BUFFER_SIZE, &actual_len,
+				   USB_RECV_TIMEOUT);
+		if (err < 0)
+			goto end;
+
+		pos = 0;
+		while (pos <= actual_len - MSG_HEADER_LEN) {
+			tmp = buf + pos;
+
+			/* Handle messages crossing the USB endpoint max packet
+			 * size boundary. Check kvaser_usb_read_bulk_callback()
+			 * for further details.
+			 */
+			if (tmp->len == 0) {
+				pos = round_up(pos, le16_to_cpu(dev->bulk_in->
+								wMaxPacketSize));
+				continue;
+			}
+
+			if (pos + tmp->len > actual_len) {
+				dev_err(dev->udev->dev.parent,
+					"Format error\n");
+				break;
+			}
+
+			if (tmp->id == id) {
+				memcpy(msg, tmp, tmp->len);
+				goto end;
+			}
+
+			pos += tmp->len;
+		}
+	} while (time_before(jiffies, to));
+
+	err = -EINVAL;
+
+end:
+	kfree(buf);
+
+	return err;
+}
+
+static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
+				      u8 msg_id, int channel)
+{
+	struct kvaser_msg *msg;
+	int rc;
+
+	msg = kmalloc(sizeof(*msg), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	msg->id = msg_id;
+	msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
+	msg->u.simple.channel = channel;
+	msg->u.simple.tid = 0xff;
+
+	rc = kvaser_usb_send_msg(dev, msg);
+
+	kfree(msg);
+	return rc;
+}
+
+static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
+{
+	struct kvaser_msg msg;
+	int err;
+
+	err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
+	if (err)
+		return err;
+
+	err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
+	if (err)
+		return err;
+
+	switch (dev->family) {
+	case KVASER_LEAF:
+		dev->fw_version = le32_to_cpu(msg.u.leaf.softinfo.fw_version);
+		dev->max_tx_urbs =
+			le16_to_cpu(msg.u.leaf.softinfo.max_outstanding_tx);
+		break;
+	case KVASER_USBCAN:
+		dev->fw_version = le32_to_cpu(msg.u.usbcan.softinfo.fw_version);
+		dev->max_tx_urbs =
+			le16_to_cpu(msg.u.usbcan.softinfo.max_outstanding_tx);
+		break;
+	}
+
+	return 0;
+}
+
+static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
+{
+	struct kvaser_msg msg;
+	int err;
+
+	err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
+	if (err)
+		return err;
+
+	err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
+	if (err)
+		return err;
+
+	dev->nchannels = msg.u.cardinfo.nchannels;
+	if ((dev->nchannels > MAX_NET_DEVICES) ||
+	    (dev->family == KVASER_USBCAN &&
+	     dev->nchannels > MAX_USBCAN_NET_DEVICES))
+		return -EINVAL;
+
+	return 0;
+}
+
+static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
+				      const struct kvaser_msg *msg)
+{
+	struct net_device_stats *stats;
+	struct kvaser_usb_tx_urb_context *context;
+	struct kvaser_usb_net_priv *priv;
+	struct sk_buff *skb;
+	struct can_frame *cf;
+	unsigned long flags;
+	u8 channel, tid;
+
+	channel = msg->u.tx_acknowledge_header.channel;
+	tid = msg->u.tx_acknowledge_header.tid;
+
+	if (channel >= dev->nchannels) {
+		dev_err(dev->udev->dev.parent,
+			"Invalid channel number (%d)\n", channel);
+		return;
+	}
+
+	priv = dev->nets[channel];
+
+	if (!netif_device_present(priv->netdev))
+		return;
+
+	stats = &priv->netdev->stats;
+
+	context = &priv->tx_contexts[tid % dev->max_tx_urbs];
+
+	/* Sometimes the state change doesn't come after a bus-off event */
+	if (priv->can.restart_ms &&
+	    (priv->can.state >= CAN_STATE_BUS_OFF)) {
+		skb = alloc_can_err_skb(priv->netdev, &cf);
+		if (skb) {
+			cf->can_id |= CAN_ERR_RESTARTED;
+
+			stats->rx_packets++;
+			stats->rx_bytes += cf->can_dlc;
+			netif_rx(skb);
+		} else {
+			netdev_err(priv->netdev,
+				   "No memory left for err_skb\n");
+		}
+
+		priv->can.can_stats.restarts++;
+		netif_carrier_on(priv->netdev);
+
+		priv->can.state = CAN_STATE_ERROR_ACTIVE;
+	}
+
+	stats->tx_packets++;
+	stats->tx_bytes += context->dlc;
+
+	spin_lock_irqsave(&priv->tx_contexts_lock, flags);
+
+	can_get_echo_skb(priv->netdev, context->echo_index);
+	context->echo_index = dev->max_tx_urbs;
+	--priv->active_tx_contexts;
+	netif_wake_queue(priv->netdev);
+
+	spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
+}
+
+static void kvaser_usb_simple_msg_callback(struct urb *urb)
+{
+	struct net_device *netdev = urb->context;
+
+	kfree(urb->transfer_buffer);
+
+	if (urb->status)
+		netdev_warn(netdev, "urb status received: %d\n",
+			    urb->status);
+}
+
+static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
+				       u8 msg_id)
+{
+	struct kvaser_usb *dev = priv->dev;
+	struct net_device *netdev = priv->netdev;
+	struct kvaser_msg *msg;
+	struct urb *urb;
+	void *buf;
+	int err;
+
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!urb) {
+		netdev_err(netdev, "No memory left for URBs\n");
+		return -ENOMEM;
+	}
+
+	buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
+	if (!buf) {
+		usb_free_urb(urb);
+		return -ENOMEM;
+	}
+
+	msg = (struct kvaser_msg *)buf;
+	msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
+	msg->id = msg_id;
+	msg->u.simple.channel = priv->channel;
+
+	usb_fill_bulk_urb(urb, dev->udev,
+			  usb_sndbulkpipe(dev->udev,
+					  dev->bulk_out->bEndpointAddress),
+			  buf, msg->len,
+			  kvaser_usb_simple_msg_callback, netdev);
+	usb_anchor_urb(urb, &priv->tx_submitted);
+
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+	if (err) {
+		netdev_err(netdev, "Error transmitting URB\n");
+		usb_unanchor_urb(urb);
+		usb_free_urb(urb);
+		return err;
+	}
+
+	usb_free_urb(urb);
+
+	return 0;
+}
+
+static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
+						 const struct kvaser_usb_error_summary *es,
+						 struct can_frame *cf)
+{
+	struct kvaser_usb *dev = priv->dev;
+	struct net_device_stats *stats = &priv->netdev->stats;
+	enum can_state cur_state, new_state, tx_state, rx_state;
+
+	netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
+
+	new_state = cur_state = priv->can.state;
+
+	if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET))
+		new_state = CAN_STATE_BUS_OFF;
+	else if (es->status & M16C_STATE_BUS_PASSIVE)
+		new_state = CAN_STATE_ERROR_PASSIVE;
+	else if (es->status & M16C_STATE_BUS_ERROR) {
+		/* Guard against spurious error events after a busoff */
+		if (cur_state < CAN_STATE_BUS_OFF) {
+			if ((es->txerr >= 128) || (es->rxerr >= 128))
+				new_state = CAN_STATE_ERROR_PASSIVE;
+			else if ((es->txerr >= 96) || (es->rxerr >= 96))
+				new_state = CAN_STATE_ERROR_WARNING;
+			else if (cur_state > CAN_STATE_ERROR_ACTIVE)
+				new_state = CAN_STATE_ERROR_ACTIVE;
+		}
+	}
+
+	if (!es->status)
+		new_state = CAN_STATE_ERROR_ACTIVE;
+
+	if (new_state != cur_state) {
+		tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
+		rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
+
+		can_change_state(priv->netdev, cf, tx_state, rx_state);
+	}
+
+	if (priv->can.restart_ms &&
+	    (cur_state >= CAN_STATE_BUS_OFF) &&
+	    (new_state < CAN_STATE_BUS_OFF)) {
+		priv->can.can_stats.restarts++;
+	}
+
+	switch (dev->family) {
+	case KVASER_LEAF:
+		if (es->leaf.error_factor) {
+			priv->can.can_stats.bus_error++;
+			stats->rx_errors++;
+		}
+		break;
+	case KVASER_USBCAN:
+		if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
+			stats->tx_errors++;
+		if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
+			stats->rx_errors++;
+		if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
+			priv->can.can_stats.bus_error++;
+		}
+		break;
+	}
+
+	priv->bec.txerr = es->txerr;
+	priv->bec.rxerr = es->rxerr;
+}
+
+static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
+				const struct kvaser_usb_error_summary *es)
+{
+	struct can_frame *cf, tmp_cf = { .can_id = CAN_ERR_FLAG, .can_dlc = CAN_ERR_DLC };
+	struct sk_buff *skb;
+	struct net_device_stats *stats;
+	struct kvaser_usb_net_priv *priv;
+	enum can_state old_state, new_state;
+
+	if (es->channel >= dev->nchannels) {
+		dev_err(dev->udev->dev.parent,
+			"Invalid channel number (%d)\n", es->channel);
+		return;
+	}
+
+	priv = dev->nets[es->channel];
+	stats = &priv->netdev->stats;
+
+	/* Update all of the can interface's state and error counters before
+	 * trying any memory allocation that can actually fail with -ENOMEM.
+	 *
+	 * We send a temporary stack-allocated error can frame to
+	 * can_change_state() for the very same reason.
+	 *
+	 * TODO: Split can_change_state() responsibility between updating the
+	 * can interface's state and counters, and the setting up of can error
+	 * frame ID and data to userspace. Remove stack allocation afterwards.
+	 */
+	old_state = priv->can.state;
+	kvaser_usb_rx_error_update_can_state(priv, es, &tmp_cf);
+	new_state = priv->can.state;
+
+	skb = alloc_can_err_skb(priv->netdev, &cf);
+	if (!skb) {
+		stats->rx_dropped++;
+		return;
+	}
+	memcpy(cf, &tmp_cf, sizeof(*cf));
+
+	if (new_state != old_state) {
+		if (es->status &
+		    (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
+			if (!priv->can.restart_ms)
+				kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
+			netif_carrier_off(priv->netdev);
+		}
+
+		if (priv->can.restart_ms &&
+		    (old_state >= CAN_STATE_BUS_OFF) &&
+		    (new_state < CAN_STATE_BUS_OFF)) {
+			cf->can_id |= CAN_ERR_RESTARTED;
+			netif_carrier_on(priv->netdev);
+		}
+	}
+
+	switch (dev->family) {
+	case KVASER_LEAF:
+		if (es->leaf.error_factor) {
+			cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
+
+			if (es->leaf.error_factor & M16C_EF_ACKE)
+				cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
+			if (es->leaf.error_factor & M16C_EF_CRCE)
+				cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
+						CAN_ERR_PROT_LOC_CRC_DEL);
+			if (es->leaf.error_factor & M16C_EF_FORME)
+				cf->data[2] |= CAN_ERR_PROT_FORM;
+			if (es->leaf.error_factor & M16C_EF_STFE)
+				cf->data[2] |= CAN_ERR_PROT_STUFF;
+			if (es->leaf.error_factor & M16C_EF_BITE0)
+				cf->data[2] |= CAN_ERR_PROT_BIT0;
+			if (es->leaf.error_factor & M16C_EF_BITE1)
+				cf->data[2] |= CAN_ERR_PROT_BIT1;
+			if (es->leaf.error_factor & M16C_EF_TRE)
+				cf->data[2] |= CAN_ERR_PROT_TX;
+		}
+		break;
+	case KVASER_USBCAN:
+		if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
+			cf->can_id |= CAN_ERR_BUSERROR;
+		}
+		break;
+	}
+
+	cf->data[6] = es->txerr;
+	cf->data[7] = es->rxerr;
+
+	stats->rx_packets++;
+	stats->rx_bytes += cf->can_dlc;
+	netif_rx(skb);
+}
+
+/* For USBCAN, report error to userspace iff the channels's errors counter
+ * has changed, or we're the only channel seeing a bus error state.
+ */
+static void kvaser_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
+						 struct kvaser_usb_error_summary *es)
+{
+	struct kvaser_usb_net_priv *priv;
+	int channel;
+	bool report_error;
+
+	channel = es->channel;
+	if (channel >= dev->nchannels) {
+		dev_err(dev->udev->dev.parent,
+			"Invalid channel number (%d)\n", channel);
+		return;
+	}
+
+	priv = dev->nets[channel];
+	report_error = false;
+
+	if (es->txerr != priv->bec.txerr) {
+		es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
+		report_error = true;
+	}
+	if (es->rxerr != priv->bec.rxerr) {
+		es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
+		report_error = true;
+	}
+	if ((es->status & M16C_STATE_BUS_ERROR) &&
+	    !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
+		es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
+		report_error = true;
+	}
+
+	if (report_error)
+		kvaser_usb_rx_error(dev, es);
+}
+
+static void kvaser_usbcan_rx_error(const struct kvaser_usb *dev,
+				   const struct kvaser_msg *msg)
+{
+	struct kvaser_usb_error_summary es = { };
+
+	switch (msg->id) {
+	/* Sometimes errors are sent as unsolicited chip state events */
+	case CMD_CHIP_STATE_EVENT:
+		es.channel = msg->u.usbcan.chip_state_event.channel;
+		es.status =  msg->u.usbcan.chip_state_event.status;
+		es.txerr = msg->u.usbcan.chip_state_event.tx_errors_count;
+		es.rxerr = msg->u.usbcan.chip_state_event.rx_errors_count;
+		kvaser_usbcan_conditionally_rx_error(dev, &es);
+		break;
+
+	case CMD_CAN_ERROR_EVENT:
+		es.channel = 0;
+		es.status = msg->u.usbcan.error_event.status_ch0;
+		es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch0;
+		es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch0;
+		es.usbcan.other_ch_status =
+			msg->u.usbcan.error_event.status_ch1;
+		kvaser_usbcan_conditionally_rx_error(dev, &es);
+
+		/* The USBCAN firmware supports up to 2 channels.
+		 * Now that ch0 was checked, check if ch1 has any errors.
+		 */
+		if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
+			es.channel = 1;
+			es.status = msg->u.usbcan.error_event.status_ch1;
+			es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch1;
+			es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch1;
+			es.usbcan.other_ch_status =
+				msg->u.usbcan.error_event.status_ch0;
+			kvaser_usbcan_conditionally_rx_error(dev, &es);
+		}
+		break;
+
+	default:
+		dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
+			msg->id);
+	}
+}
+
+static void kvaser_leaf_rx_error(const struct kvaser_usb *dev,
+				 const struct kvaser_msg *msg)
+{
+	struct kvaser_usb_error_summary es = { };
+
+	switch (msg->id) {
+	case CMD_CAN_ERROR_EVENT:
+		es.channel = msg->u.leaf.error_event.channel;
+		es.status =  msg->u.leaf.error_event.status;
+		es.txerr = msg->u.leaf.error_event.tx_errors_count;
+		es.rxerr = msg->u.leaf.error_event.rx_errors_count;
+		es.leaf.error_factor = msg->u.leaf.error_event.error_factor;
+		break;
+	case CMD_LEAF_LOG_MESSAGE:
+		es.channel = msg->u.leaf.log_message.channel;
+		es.status = msg->u.leaf.log_message.data[0];
+		es.txerr = msg->u.leaf.log_message.data[2];
+		es.rxerr = msg->u.leaf.log_message.data[3];
+		es.leaf.error_factor = msg->u.leaf.log_message.data[1];
+		break;
+	case CMD_CHIP_STATE_EVENT:
+		es.channel = msg->u.leaf.chip_state_event.channel;
+		es.status =  msg->u.leaf.chip_state_event.status;
+		es.txerr = msg->u.leaf.chip_state_event.tx_errors_count;
+		es.rxerr = msg->u.leaf.chip_state_event.rx_errors_count;
+		es.leaf.error_factor = 0;
+		break;
+	default:
+		dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
+			msg->id);
+		return;
+	}
+
+	kvaser_usb_rx_error(dev, &es);
+}
+
+static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
+				  const struct kvaser_msg *msg)
+{
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	struct net_device_stats *stats = &priv->netdev->stats;
+
+	if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
+					 MSG_FLAG_NERR)) {
+		netdev_err(priv->netdev, "Unknown error (flags: 0x%02x)\n",
+			   msg->u.rx_can_header.flag);
+
+		stats->rx_errors++;
+		return;
+	}
+
+	if (msg->u.rx_can_header.flag & MSG_FLAG_OVERRUN) {
+		stats->rx_over_errors++;
+		stats->rx_errors++;
+
+		skb = alloc_can_err_skb(priv->netdev, &cf);
+		if (!skb) {
+			stats->rx_dropped++;
+			return;
+		}
+
+		cf->can_id |= CAN_ERR_CRTL;
+		cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
+
+		stats->rx_packets++;
+		stats->rx_bytes += cf->can_dlc;
+		netif_rx(skb);
+	}
+}
+
+static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
+				  const struct kvaser_msg *msg)
+{
+	struct kvaser_usb_net_priv *priv;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	struct net_device_stats *stats;
+	u8 channel = msg->u.rx_can_header.channel;
+	const u8 *rx_msg = NULL;	/* GCC */
+
+	if (channel >= dev->nchannels) {
+		dev_err(dev->udev->dev.parent,
+			"Invalid channel number (%d)\n", channel);
+		return;
+	}
+
+	priv = dev->nets[channel];
+	stats = &priv->netdev->stats;
+
+	if ((msg->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
+	    (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE)) {
+		kvaser_leaf_rx_error(dev, msg);
+		return;
+	} else if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
+						MSG_FLAG_NERR |
+						MSG_FLAG_OVERRUN)) {
+		kvaser_usb_rx_can_err(priv, msg);
+		return;
+	} else if (msg->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
+		netdev_warn(priv->netdev,
+			    "Unhandled frame (flags: 0x%02x)",
+			    msg->u.rx_can_header.flag);
+		return;
+	}
+
+	switch (dev->family) {
+	case KVASER_LEAF:
+		rx_msg = msg->u.leaf.rx_can.msg;
+		break;
+	case KVASER_USBCAN:
+		rx_msg = msg->u.usbcan.rx_can.msg;
+		break;
+	}
+
+	skb = alloc_can_skb(priv->netdev, &cf);
+	if (!skb) {
+		stats->tx_dropped++;
+		return;
+	}
+
+	if (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE) {
+		cf->can_id = le32_to_cpu(msg->u.leaf.log_message.id);
+		if (cf->can_id & KVASER_EXTENDED_FRAME)
+			cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
+		else
+			cf->can_id &= CAN_SFF_MASK;
+
+		cf->can_dlc = get_can_dlc(msg->u.leaf.log_message.dlc);
+
+		if (msg->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
+			cf->can_id |= CAN_RTR_FLAG;
+		else
+			memcpy(cf->data, &msg->u.leaf.log_message.data,
+			       cf->can_dlc);
+	} else {
+		cf->can_id = ((rx_msg[0] & 0x1f) << 6) | (rx_msg[1] & 0x3f);
+
+		if (msg->id == CMD_RX_EXT_MESSAGE) {
+			cf->can_id <<= 18;
+			cf->can_id |= ((rx_msg[2] & 0x0f) << 14) |
+				      ((rx_msg[3] & 0xff) << 6) |
+				      (rx_msg[4] & 0x3f);
+			cf->can_id |= CAN_EFF_FLAG;
+		}
+
+		cf->can_dlc = get_can_dlc(rx_msg[5]);
+
+		if (msg->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
+			cf->can_id |= CAN_RTR_FLAG;
+		else
+			memcpy(cf->data, &rx_msg[6],
+			       cf->can_dlc);
+	}
+
+	stats->rx_packets++;
+	stats->rx_bytes += cf->can_dlc;
+	netif_rx(skb);
+}
+
+static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
+					const struct kvaser_msg *msg)
+{
+	struct kvaser_usb_net_priv *priv;
+	u8 channel = msg->u.simple.channel;
+
+	if (channel >= dev->nchannels) {
+		dev_err(dev->udev->dev.parent,
+			"Invalid channel number (%d)\n", channel);
+		return;
+	}
+
+	priv = dev->nets[channel];
+
+	if (completion_done(&priv->start_comp) &&
+	    netif_queue_stopped(priv->netdev)) {
+		netif_wake_queue(priv->netdev);
+	} else {
+		netif_start_queue(priv->netdev);
+		complete(&priv->start_comp);
+	}
+}
+
+static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
+				       const struct kvaser_msg *msg)
+{
+	struct kvaser_usb_net_priv *priv;
+	u8 channel = msg->u.simple.channel;
+
+	if (channel >= dev->nchannels) {
+		dev_err(dev->udev->dev.parent,
+			"Invalid channel number (%d)\n", channel);
+		return;
+	}
+
+	priv = dev->nets[channel];
+
+	complete(&priv->stop_comp);
+}
+
+static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
+				      const struct kvaser_msg *msg)
+{
+	switch (msg->id) {
+	case CMD_START_CHIP_REPLY:
+		kvaser_usb_start_chip_reply(dev, msg);
+		break;
+
+	case CMD_STOP_CHIP_REPLY:
+		kvaser_usb_stop_chip_reply(dev, msg);
+		break;
+
+	case CMD_RX_STD_MESSAGE:
+	case CMD_RX_EXT_MESSAGE:
+		kvaser_usb_rx_can_msg(dev, msg);
+		break;
+
+	case CMD_LEAF_LOG_MESSAGE:
+		if (dev->family != KVASER_LEAF)
+			goto warn;
+		kvaser_usb_rx_can_msg(dev, msg);
+		break;
+
+	case CMD_CHIP_STATE_EVENT:
+	case CMD_CAN_ERROR_EVENT:
+		if (dev->family == KVASER_LEAF)
+			kvaser_leaf_rx_error(dev, msg);
+		else
+			kvaser_usbcan_rx_error(dev, msg);
+		break;
+
+	case CMD_TX_ACKNOWLEDGE:
+		kvaser_usb_tx_acknowledge(dev, msg);
+		break;
+
+	/* Ignored messages */
+	case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
+		if (dev->family != KVASER_USBCAN)
+			goto warn;
+		break;
+
+	default:
+warn:		dev_warn(dev->udev->dev.parent,
+			 "Unhandled message (%d)\n", msg->id);
+		break;
+	}
+}
+
+static void kvaser_usb_read_bulk_callback(struct urb *urb)
+{
+	struct kvaser_usb *dev = urb->context;
+	struct kvaser_msg *msg;
+	int pos = 0;
+	int err, i;
+
+	switch (urb->status) {
+	case 0:
+		break;
+	case -ENOENT:
+	case -ESHUTDOWN:
+		return;
+	default:
+		dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
+			 urb->status);
+		goto resubmit_urb;
+	}
+
+	while (pos <= urb->actual_length - MSG_HEADER_LEN) {
+		msg = urb->transfer_buffer + pos;
+
+		/* The Kvaser firmware can only read and write messages that
+		 * does not cross the USB's endpoint wMaxPacketSize boundary.
+		 * If a follow-up command crosses such boundary, firmware puts
+		 * a placeholder zero-length command in its place then aligns
+		 * the real command to the next max packet size.
+		 *
+		 * Handle such cases or we're going to miss a significant
+		 * number of events in case of a heavy rx load on the bus.
+		 */
+		if (msg->len == 0) {
+			pos = round_up(pos, le16_to_cpu(dev->bulk_in->
+							wMaxPacketSize));
+			continue;
+		}
+
+		if (pos + msg->len > urb->actual_length) {
+			dev_err(dev->udev->dev.parent, "Format error\n");
+			break;
+		}
+
+		kvaser_usb_handle_message(dev, msg);
+		pos += msg->len;
+	}
+
+resubmit_urb:
+	usb_fill_bulk_urb(urb, dev->udev,
+			  usb_rcvbulkpipe(dev->udev,
+					  dev->bulk_in->bEndpointAddress),
+			  urb->transfer_buffer, RX_BUFFER_SIZE,
+			  kvaser_usb_read_bulk_callback, dev);
+
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+	if (err == -ENODEV) {
+		for (i = 0; i < dev->nchannels; i++) {
+			if (!dev->nets[i])
+				continue;
+
+			netif_device_detach(dev->nets[i]->netdev);
+		}
+	} else if (err) {
+		dev_err(dev->udev->dev.parent,
+			"Failed resubmitting read bulk urb: %d\n", err);
+	}
+
+	return;
+}
+
+static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
+{
+	int i, err = 0;
+
+	if (dev->rxinitdone)
+		return 0;
+
+	for (i = 0; i < MAX_RX_URBS; i++) {
+		struct urb *urb = NULL;
+		u8 *buf = NULL;
+		dma_addr_t buf_dma;
+
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!urb) {
+			dev_warn(dev->udev->dev.parent,
+				 "No memory left for URBs\n");
+			err = -ENOMEM;
+			break;
+		}
+
+		buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
+					 GFP_KERNEL, &buf_dma);
+		if (!buf) {
+			dev_warn(dev->udev->dev.parent,
+				 "No memory left for USB buffer\n");
+			usb_free_urb(urb);
+			err = -ENOMEM;
+			break;
+		}
+
+		usb_fill_bulk_urb(urb, dev->udev,
+				  usb_rcvbulkpipe(dev->udev,
+					  dev->bulk_in->bEndpointAddress),
+				  buf, RX_BUFFER_SIZE,
+				  kvaser_usb_read_bulk_callback,
+				  dev);
+		urb->transfer_dma = buf_dma;
+		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+		usb_anchor_urb(urb, &dev->rx_submitted);
+
+		err = usb_submit_urb(urb, GFP_KERNEL);
+		if (err) {
+			usb_unanchor_urb(urb);
+			usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
+					  buf_dma);
+			usb_free_urb(urb);
+			break;
+		}
+
+		dev->rxbuf[i] = buf;
+		dev->rxbuf_dma[i] = buf_dma;
+
+		usb_free_urb(urb);
+	}
+
+	if (i == 0) {
+		dev_warn(dev->udev->dev.parent,
+			 "Cannot setup read URBs, error %d\n", err);
+		return err;
+	} else if (i < MAX_RX_URBS) {
+		dev_warn(dev->udev->dev.parent,
+			 "RX performances may be slow\n");
+	}
+
+	dev->rxinitdone = true;
+
+	return 0;
+}
+
+static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
+{
+	struct kvaser_msg *msg;
+	int rc;
+
+	msg = kmalloc(sizeof(*msg), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	msg->id = CMD_SET_CTRL_MODE;
+	msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
+	msg->u.ctrl_mode.tid = 0xff;
+	msg->u.ctrl_mode.channel = priv->channel;
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
+		msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
+	else
+		msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
+
+	rc = kvaser_usb_send_msg(priv->dev, msg);
+
+	kfree(msg);
+	return rc;
+}
+
+static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
+{
+	int err;
+
+	init_completion(&priv->start_comp);
+
+	err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
+					 priv->channel);
+	if (err)
+		return err;
+
+	if (!wait_for_completion_timeout(&priv->start_comp,
+					 msecs_to_jiffies(START_TIMEOUT)))
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static int kvaser_usb_open(struct net_device *netdev)
+{
+	struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
+	struct kvaser_usb *dev = priv->dev;
+	int err;
+
+	err = open_candev(netdev);
+	if (err)
+		return err;
+
+	err = kvaser_usb_setup_rx_urbs(dev);
+	if (err)
+		goto error;
+
+	err = kvaser_usb_set_opt_mode(priv);
+	if (err)
+		goto error;
+
+	err = kvaser_usb_start_chip(priv);
+	if (err) {
+		netdev_warn(netdev, "Cannot start device, error %d\n", err);
+		goto error;
+	}
+
+	priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+	return 0;
+
+error:
+	close_candev(netdev);
+	return err;
+}
+
+static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
+{
+	int i, max_tx_urbs;
+
+	max_tx_urbs = priv->dev->max_tx_urbs;
+
+	priv->active_tx_contexts = 0;
+	for (i = 0; i < max_tx_urbs; i++)
+		priv->tx_contexts[i].echo_index = max_tx_urbs;
+}
+
+/* This method might sleep. Do not call it in the atomic context
+ * of URB completions.
+ */
+static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
+{
+	usb_kill_anchored_urbs(&priv->tx_submitted);
+	kvaser_usb_reset_tx_urb_contexts(priv);
+}
+
+static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
+{
+	int i;
+
+	usb_kill_anchored_urbs(&dev->rx_submitted);
+
+	for (i = 0; i < MAX_RX_URBS; i++)
+		usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
+				  dev->rxbuf[i],
+				  dev->rxbuf_dma[i]);
+
+	for (i = 0; i < dev->nchannels; i++) {
+		struct kvaser_usb_net_priv *priv = dev->nets[i];
+
+		if (priv)
+			kvaser_usb_unlink_tx_urbs(priv);
+	}
+}
+
+static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
+{
+	int err;
+
+	init_completion(&priv->stop_comp);
+
+	err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
+					 priv->channel);
+	if (err)
+		return err;
+
+	if (!wait_for_completion_timeout(&priv->stop_comp,
+					 msecs_to_jiffies(STOP_TIMEOUT)))
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
+{
+	struct kvaser_msg *msg;
+	int rc;
+
+	msg = kmalloc(sizeof(*msg), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	msg->id = CMD_FLUSH_QUEUE;
+	msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
+	msg->u.flush_queue.channel = priv->channel;
+	msg->u.flush_queue.flags = 0x00;
+
+	rc = kvaser_usb_send_msg(priv->dev, msg);
+
+	kfree(msg);
+	return rc;
+}
+
+static int kvaser_usb_close(struct net_device *netdev)
+{
+	struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
+	struct kvaser_usb *dev = priv->dev;
+	int err;
+
+	netif_stop_queue(netdev);
+
+	err = kvaser_usb_flush_queue(priv);
+	if (err)
+		netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
+
+	if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
+		netdev_warn(netdev, "Cannot reset card, error %d\n", err);
+
+	err = kvaser_usb_stop_chip(priv);
+	if (err)
+		netdev_warn(netdev, "Cannot stop device, error %d\n", err);
+
+	/* reset tx contexts */
+	kvaser_usb_unlink_tx_urbs(priv);
+
+	priv->can.state = CAN_STATE_STOPPED;
+	close_candev(priv->netdev);
+
+	return 0;
+}
+
+static void kvaser_usb_write_bulk_callback(struct urb *urb)
+{
+	struct kvaser_usb_tx_urb_context *context = urb->context;
+	struct kvaser_usb_net_priv *priv;
+	struct net_device *netdev;
+
+	if (WARN_ON(!context))
+		return;
+
+	priv = context->priv;
+	netdev = priv->netdev;
+
+	kfree(urb->transfer_buffer);
+
+	if (!netif_device_present(netdev))
+		return;
+
+	if (urb->status)
+		netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
+}
+
+static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
+					 struct net_device *netdev)
+{
+	struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
+	struct kvaser_usb *dev = priv->dev;
+	struct net_device_stats *stats = &netdev->stats;
+	struct can_frame *cf = (struct can_frame *)skb->data;
+	struct kvaser_usb_tx_urb_context *context = NULL;
+	struct urb *urb;
+	void *buf;
+	struct kvaser_msg *msg;
+	int i, err, ret = NETDEV_TX_OK;
+	u8 *msg_tx_can_flags = NULL;		/* GCC */
+	unsigned long flags;
+
+	if (can_dropped_invalid_skb(netdev, skb))
+		return NETDEV_TX_OK;
+
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!urb) {
+		netdev_err(netdev, "No memory left for URBs\n");
+		stats->tx_dropped++;
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
+	if (!buf) {
+		stats->tx_dropped++;
+		dev_kfree_skb(skb);
+		goto freeurb;
+	}
+
+	msg = buf;
+	msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
+	msg->u.tx_can.channel = priv->channel;
+
+	switch (dev->family) {
+	case KVASER_LEAF:
+		msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
+		break;
+	case KVASER_USBCAN:
+		msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
+		break;
+	}
+
+	*msg_tx_can_flags = 0;
+
+	if (cf->can_id & CAN_EFF_FLAG) {
+		msg->id = CMD_TX_EXT_MESSAGE;
+		msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
+		msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
+		msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
+		msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
+		msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
+	} else {
+		msg->id = CMD_TX_STD_MESSAGE;
+		msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
+		msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
+	}
+
+	msg->u.tx_can.msg[5] = cf->can_dlc;
+	memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
+
+	if (cf->can_id & CAN_RTR_FLAG)
+		*msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
+
+	spin_lock_irqsave(&priv->tx_contexts_lock, flags);
+	for (i = 0; i < dev->max_tx_urbs; i++) {
+		if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
+			context = &priv->tx_contexts[i];
+
+			context->echo_index = i;
+			can_put_echo_skb(skb, netdev, context->echo_index);
+			++priv->active_tx_contexts;
+			if (priv->active_tx_contexts >= dev->max_tx_urbs)
+				netif_stop_queue(netdev);
+
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
+
+	/* This should never happen; it implies a flow control bug */
+	if (!context) {
+		netdev_warn(netdev, "cannot find free context\n");
+
+		kfree(buf);
+		ret =  NETDEV_TX_BUSY;
+		goto freeurb;
+	}
+
+	context->priv = priv;
+	context->dlc = cf->can_dlc;
+
+	msg->u.tx_can.tid = context->echo_index;
+
+	usb_fill_bulk_urb(urb, dev->udev,
+			  usb_sndbulkpipe(dev->udev,
+					  dev->bulk_out->bEndpointAddress),
+			  buf, msg->len,
+			  kvaser_usb_write_bulk_callback, context);
+	usb_anchor_urb(urb, &priv->tx_submitted);
+
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+	if (unlikely(err)) {
+		spin_lock_irqsave(&priv->tx_contexts_lock, flags);
+
+		can_free_echo_skb(netdev, context->echo_index);
+		context->echo_index = dev->max_tx_urbs;
+		--priv->active_tx_contexts;
+		netif_wake_queue(netdev);
+
+		spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
+
+		usb_unanchor_urb(urb);
+
+		stats->tx_dropped++;
+
+		if (err == -ENODEV)
+			netif_device_detach(netdev);
+		else
+			netdev_warn(netdev, "Failed tx_urb %d\n", err);
+
+		goto freeurb;
+	}
+
+	ret = NETDEV_TX_OK;
+
+freeurb:
+	usb_free_urb(urb);
+	return ret;
+}
+
+static const struct net_device_ops kvaser_usb_netdev_ops = {
+	.ndo_open = kvaser_usb_open,
+	.ndo_stop = kvaser_usb_close,
+	.ndo_start_xmit = kvaser_usb_start_xmit,
+	.ndo_change_mtu = can_change_mtu,
+};
+
+static const struct can_bittiming_const kvaser_usb_bittiming_const = {
+	.name = "kvaser_usb",
+	.tseg1_min = KVASER_USB_TSEG1_MIN,
+	.tseg1_max = KVASER_USB_TSEG1_MAX,
+	.tseg2_min = KVASER_USB_TSEG2_MIN,
+	.tseg2_max = KVASER_USB_TSEG2_MAX,
+	.sjw_max = KVASER_USB_SJW_MAX,
+	.brp_min = KVASER_USB_BRP_MIN,
+	.brp_max = KVASER_USB_BRP_MAX,
+	.brp_inc = KVASER_USB_BRP_INC,
+};
+
+static int kvaser_usb_set_bittiming(struct net_device *netdev)
+{
+	struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
+	struct can_bittiming *bt = &priv->can.bittiming;
+	struct kvaser_usb *dev = priv->dev;
+	struct kvaser_msg *msg;
+	int rc;
+
+	msg = kmalloc(sizeof(*msg), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	msg->id = CMD_SET_BUS_PARAMS;
+	msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
+	msg->u.busparams.channel = priv->channel;
+	msg->u.busparams.tid = 0xff;
+	msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
+	msg->u.busparams.sjw = bt->sjw;
+	msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
+	msg->u.busparams.tseg2 = bt->phase_seg2;
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
+		msg->u.busparams.no_samp = 3;
+	else
+		msg->u.busparams.no_samp = 1;
+
+	rc = kvaser_usb_send_msg(dev, msg);
+
+	kfree(msg);
+	return rc;
+}
+
+static int kvaser_usb_set_mode(struct net_device *netdev,
+			       enum can_mode mode)
+{
+	struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
+	int err;
+
+	switch (mode) {
+	case CAN_MODE_START:
+		err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
+		if (err)
+			return err;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
+				       struct can_berr_counter *bec)
+{
+	struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
+
+	*bec = priv->bec;
+
+	return 0;
+}
+
+static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
+{
+	int i;
+
+	for (i = 0; i < dev->nchannels; i++) {
+		if (!dev->nets[i])
+			continue;
+
+		unregister_candev(dev->nets[i]->netdev);
+	}
+
+	kvaser_usb_unlink_all_urbs(dev);
+
+	for (i = 0; i < dev->nchannels; i++) {
+		if (!dev->nets[i])
+			continue;
+
+		free_candev(dev->nets[i]->netdev);
+	}
+}
+
+static int kvaser_usb_init_one(struct usb_interface *intf,
+			       const struct usb_device_id *id, int channel)
+{
+	struct kvaser_usb *dev = usb_get_intfdata(intf);
+	struct net_device *netdev;
+	struct kvaser_usb_net_priv *priv;
+	int err;
+
+	err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
+	if (err)
+		return err;
+
+	netdev = alloc_candev(sizeof(*priv) +
+			      dev->max_tx_urbs * sizeof(*priv->tx_contexts),
+			      dev->max_tx_urbs);
+	if (!netdev) {
+		dev_err(&intf->dev, "Cannot alloc candev\n");
+		return -ENOMEM;
+	}
+
+	priv = netdev_priv(netdev);
+
+	init_usb_anchor(&priv->tx_submitted);
+	init_completion(&priv->start_comp);
+	init_completion(&priv->stop_comp);
+
+	priv->dev = dev;
+	priv->netdev = netdev;
+	priv->channel = channel;
+
+	spin_lock_init(&priv->tx_contexts_lock);
+	kvaser_usb_reset_tx_urb_contexts(priv);
+
+	priv->can.state = CAN_STATE_STOPPED;
+	priv->can.clock.freq = CAN_USB_CLOCK;
+	priv->can.bittiming_const = &kvaser_usb_bittiming_const;
+	priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
+	priv->can.do_set_mode = kvaser_usb_set_mode;
+	if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
+		priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
+	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
+	if (id->driver_info & KVASER_HAS_SILENT_MODE)
+		priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
+
+	netdev->flags |= IFF_ECHO;
+
+	netdev->netdev_ops = &kvaser_usb_netdev_ops;
+
+	SET_NETDEV_DEV(netdev, &intf->dev);
+	netdev->dev_id = channel;
+
+	dev->nets[channel] = priv;
+
+	err = register_candev(netdev);
+	if (err) {
+		dev_err(&intf->dev, "Failed to register can device\n");
+		free_candev(netdev);
+		dev->nets[channel] = NULL;
+		return err;
+	}
+
+	netdev_dbg(netdev, "device registered\n");
+
+	return 0;
+}
+
+static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
+				    struct usb_endpoint_descriptor **in,
+				    struct usb_endpoint_descriptor **out)
+{
+	const struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+	int i;
+
+	iface_desc = &intf->altsetting[0];
+
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+		endpoint = &iface_desc->endpoint[i].desc;
+
+		if (!*in && usb_endpoint_is_bulk_in(endpoint))
+			*in = endpoint;
+
+		if (!*out && usb_endpoint_is_bulk_out(endpoint))
+			*out = endpoint;
+
+		/* use first bulk endpoint for in and out */
+		if (*in && *out)
+			return 0;
+	}
+
+	return -ENODEV;
+}
+
+static int kvaser_usb_probe(struct usb_interface *intf,
+			    const struct usb_device_id *id)
+{
+	struct kvaser_usb *dev;
+	int err = -ENOMEM;
+	int i, retry = 3;
+
+	dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	if (kvaser_is_leaf(id)) {
+		dev->family = KVASER_LEAF;
+	} else if (kvaser_is_usbcan(id)) {
+		dev->family = KVASER_USBCAN;
+	} else {
+		dev_err(&intf->dev,
+			"Product ID (%d) does not belong to any known Kvaser USB family",
+			id->idProduct);
+		return -ENODEV;
+	}
+
+	err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
+	if (err) {
+		dev_err(&intf->dev, "Cannot get usb endpoint(s)");
+		return err;
+	}
+
+	dev->udev = interface_to_usbdev(intf);
+
+	init_usb_anchor(&dev->rx_submitted);
+
+	usb_set_intfdata(intf, dev);
+
+	/* On some x86 laptops, plugging a Kvaser device again after
+	 * an unplug makes the firmware always ignore the very first
+	 * command. For such a case, provide some room for retries
+	 * instead of completely exiting the driver.
+	 */
+	do {
+		err = kvaser_usb_get_software_info(dev);
+	} while (--retry && err == -ETIMEDOUT);
+
+	if (err) {
+		dev_err(&intf->dev,
+			"Cannot get software infos, error %d\n", err);
+		return err;
+	}
+
+	dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
+		((dev->fw_version >> 24) & 0xff),
+		((dev->fw_version >> 16) & 0xff),
+		(dev->fw_version & 0xffff));
+
+	dev_dbg(&intf->dev, "Max oustanding tx = %d URBs\n", dev->max_tx_urbs);
+
+	err = kvaser_usb_get_card_info(dev);
+	if (err) {
+		dev_err(&intf->dev,
+			"Cannot get card infos, error %d\n", err);
+		return err;
+	}
+
+	for (i = 0; i < dev->nchannels; i++) {
+		err = kvaser_usb_init_one(intf, id, i);
+		if (err) {
+			kvaser_usb_remove_interfaces(dev);
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+static void kvaser_usb_disconnect(struct usb_interface *intf)
+{
+	struct kvaser_usb *dev = usb_get_intfdata(intf);
+
+	usb_set_intfdata(intf, NULL);
+
+	if (!dev)
+		return;
+
+	kvaser_usb_remove_interfaces(dev);
+}
+
+static struct usb_driver kvaser_usb_driver = {
+	.name = "kvaser_usb",
+	.probe = kvaser_usb_probe,
+	.disconnect = kvaser_usb_disconnect,
+	.id_table = kvaser_usb_table,
+};
+
+module_usb_driver(kvaser_usb_driver);
+
+MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
+MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/net/can/usb/peak_usb/Makefile b/drivers/net/can/usb/peak_usb/Makefile
new file mode 100644
index 000000000..1839e9ca6
--- /dev/null
+++ b/drivers/net/can/usb/peak_usb/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_CAN_PEAK_USB) += peak_usb.o
+peak_usb-y = pcan_usb_core.o pcan_usb.o pcan_usb_pro.o pcan_usb_fd.o
diff --git a/drivers/net/can/usb/peak_usb/pcan_ucan.h b/drivers/net/can/usb/peak_usb/pcan_ucan.h
new file mode 100644
index 000000000..e8fc4952c
--- /dev/null
+++ b/drivers/net/can/usb/peak_usb/pcan_ucan.h
@@ -0,0 +1,223 @@
+/*
+ * CAN driver for PEAK System micro-CAN based adapters
+ *
+ * Copyright (C) 2003-2011 PEAK System-Technik GmbH
+ * Copyright (C) 2011-2013 Stephane Grosjean <s.grosjean@peak-system.com>
+ *
+ * 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 of the License.
+ *
+ * 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.
+ */
+#ifndef PUCAN_H
+#define PUCAN_H
+
+/* uCAN commands opcodes list (low-order 10 bits) */
+#define PUCAN_CMD_NOP			0x000
+#define PUCAN_CMD_RESET_MODE		0x001
+#define PUCAN_CMD_NORMAL_MODE		0x002
+#define PUCAN_CMD_LISTEN_ONLY_MODE	0x003
+#define PUCAN_CMD_TIMING_SLOW		0x004
+#define PUCAN_CMD_TIMING_FAST		0x005
+#define PUCAN_CMD_FILTER_STD		0x008
+#define PUCAN_CMD_TX_ABORT		0x009
+#define PUCAN_CMD_WR_ERR_CNT		0x00a
+#define PUCAN_CMD_SET_EN_OPTION		0x00b
+#define PUCAN_CMD_CLR_DIS_OPTION	0x00c
+#define PUCAN_CMD_END_OF_COLLECTION	0x3ff
+
+/* uCAN received messages list */
+#define PUCAN_MSG_CAN_RX		0x0001
+#define PUCAN_MSG_ERROR			0x0002
+#define PUCAN_MSG_STATUS		0x0003
+#define PUCAN_MSG_BUSLOAD		0x0004
+#define PUCAN_MSG_CAN_TX		0x1000
+
+/* uCAN command common header */
+struct __packed pucan_command {
+	__le16	opcode_channel;
+	u16	args[3];
+};
+
+/* uCAN TIMING_SLOW command fields */
+#define PUCAN_TSLOW_SJW_T(s, t)		(((s) & 0xf) | ((!!(t)) << 7))
+#define PUCAN_TSLOW_TSEG2(t)		((t) & 0xf)
+#define PUCAN_TSLOW_TSEG1(t)		((t) & 0x3f)
+#define PUCAN_TSLOW_BRP(b)		((b) & 0x3ff)
+
+struct __packed pucan_timing_slow {
+	__le16	opcode_channel;
+
+	u8	ewl;		/* Error Warning limit */
+	u8	sjw_t;		/* Sync Jump Width + Triple sampling */
+	u8	tseg2;		/* Timing SEGment 2 */
+	u8	tseg1;		/* Timing SEGment 1 */
+
+	__le16	brp;		/* BaudRate Prescaler */
+};
+
+/* uCAN TIMING_FAST command fields */
+#define PUCAN_TFAST_SJW(s)		((s) & 0x3)
+#define PUCAN_TFAST_TSEG2(t)		((t) & 0x7)
+#define PUCAN_TFAST_TSEG1(t)		((t) & 0xf)
+#define PUCAN_TFAST_BRP(b)		((b) & 0x3ff)
+
+struct __packed pucan_timing_fast {
+	__le16	opcode_channel;
+
+	u8	unused;
+	u8	sjw;		/* Sync Jump Width */
+	u8	tseg2;		/* Timing SEGment 2 */
+	u8	tseg1;		/* Timing SEGment 1 */
+
+	__le16	brp;		/* BaudRate Prescaler */
+};
+
+/* uCAN FILTER_STD command fields */
+#define PUCAN_FLTSTD_ROW_IDX_BITS	6
+
+struct __packed pucan_filter_std {
+	__le16	opcode_channel;
+
+	__le16	idx;
+	__le32	mask;		/* CAN-ID bitmask in idx range */
+};
+
+/* uCAN WR_ERR_CNT command fields */
+#define PUCAN_WRERRCNT_TE		0x4000	/* Tx error cntr write Enable */
+#define PUCAN_WRERRCNT_RE		0x8000	/* Rx error cntr write Enable */
+
+struct __packed pucan_wr_err_cnt {
+	__le16	opcode_channel;
+
+	__le16	sel_mask;
+	u8	tx_counter;	/* Tx error counter new value */
+	u8	rx_counter;	/* Rx error counter new value */
+
+	u16	unused;
+};
+
+/* uCAN SET_EN/CLR_DIS _OPTION command fields */
+#define PUCAN_OPTION_ERROR		0x0001
+#define PUCAN_OPTION_BUSLOAD		0x0002
+#define PUCAN_OPTION_CANDFDISO		0x0004
+
+struct __packed pucan_options {
+	__le16	opcode_channel;
+
+	__le16	options;
+	u32	unused;
+};
+
+/* uCAN received messages global format */
+struct __packed pucan_msg {
+	__le16	size;
+	__le16	type;
+	__le32	ts_low;
+	__le32	ts_high;
+};
+
+/* uCAN flags for CAN/CANFD messages */
+#define PUCAN_MSG_SELF_RECEIVE		0x80
+#define PUCAN_MSG_ERROR_STATE_IND	0x40	/* error state indicator */
+#define PUCAN_MSG_BITRATE_SWITCH	0x20	/* bitrate switch */
+#define PUCAN_MSG_EXT_DATA_LEN		0x10	/* extended data length */
+#define PUCAN_MSG_SINGLE_SHOT		0x08
+#define PUCAN_MSG_LOOPED_BACK		0x04
+#define PUCAN_MSG_EXT_ID		0x02
+#define PUCAN_MSG_RTR			0x01
+
+struct __packed pucan_rx_msg {
+	__le16	size;
+	__le16	type;
+	__le32	ts_low;
+	__le32	ts_high;
+	__le32	tag_low;
+	__le32	tag_high;
+	u8	channel_dlc;
+	u8	client;
+	__le16	flags;
+	__le32	can_id;
+	u8	d[0];
+};
+
+/* uCAN error types */
+#define PUCAN_ERMSG_BIT_ERROR		0
+#define PUCAN_ERMSG_FORM_ERROR		1
+#define PUCAN_ERMSG_STUFF_ERROR		2
+#define PUCAN_ERMSG_OTHER_ERROR		3
+#define PUCAN_ERMSG_ERR_CNT_DEC		4
+
+struct __packed pucan_error_msg {
+	__le16	size;
+	__le16	type;
+	__le32	ts_low;
+	__le32	ts_high;
+	u8	channel_type_d;
+	u8	code_g;
+	u8	tx_err_cnt;
+	u8	rx_err_cnt;
+};
+
+#define PUCAN_BUS_PASSIVE		0x20
+#define PUCAN_BUS_WARNING		0x40
+#define PUCAN_BUS_BUSOFF		0x80
+
+struct __packed pucan_status_msg {
+	__le16	size;
+	__le16	type;
+	__le32	ts_low;
+	__le32	ts_high;
+	u8	channel_p_w_b;
+	u8	unused[3];
+};
+
+/* uCAN transmitted message format */
+#define PUCAN_MSG_CHANNEL_DLC(c, d)	(((c) & 0xf) | ((d) << 4))
+
+struct __packed pucan_tx_msg {
+	__le16	size;
+	__le16	type;
+	__le32	tag_low;
+	__le32	tag_high;
+	u8	channel_dlc;
+	u8	client;
+	__le16	flags;
+	__le32	can_id;
+	u8	d[0];
+};
+
+/* build the cmd opcode_channel field with respect to the correct endianness */
+static inline __le16 pucan_cmd_opcode_channel(struct peak_usb_device *dev,
+					      int opcode)
+{
+	return cpu_to_le16(((dev->ctrl_idx) << 12) | ((opcode) & 0x3ff));
+}
+
+/* return the channel number part from any received message channel_dlc field */
+static inline int pucan_msg_get_channel(struct pucan_rx_msg *rm)
+{
+	return rm->channel_dlc & 0xf;
+}
+
+/* return the dlc value from any received message channel_dlc field */
+static inline int pucan_msg_get_dlc(struct pucan_rx_msg *rm)
+{
+	return rm->channel_dlc >> 4;
+}
+
+static inline int pucan_ermsg_get_channel(struct pucan_error_msg *em)
+{
+	return em->channel_type_d & 0x0f;
+}
+
+static inline int pucan_stmsg_get_channel(struct pucan_status_msg *sm)
+{
+	return sm->channel_p_w_b & 0x0f;
+}
+
+#endif
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
new file mode 100644
index 000000000..72427f21e
--- /dev/null
+++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
@@ -0,0 +1,905 @@
+/*
+ * CAN driver for PEAK System PCAN-USB adapter
+ * Derived from the PCAN project file driver/src/pcan_usb.c
+ *
+ * Copyright (C) 2003-2010 PEAK System-Technik GmbH
+ * Copyright (C) 2011-2012 Stephane Grosjean <s.grosjean@peak-system.com>
+ *
+ * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de>
+ *
+ * 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 of the License.
+ *
+ * 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.
+ */
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+#include <linux/module.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+#include "pcan_usb_core.h"
+
+MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB adapter");
+
+/* PCAN-USB Endpoints */
+#define PCAN_USB_EP_CMDOUT		1
+#define PCAN_USB_EP_CMDIN		(PCAN_USB_EP_CMDOUT | USB_DIR_IN)
+#define PCAN_USB_EP_MSGOUT		2
+#define PCAN_USB_EP_MSGIN		(PCAN_USB_EP_MSGOUT | USB_DIR_IN)
+
+/* PCAN-USB command struct */
+#define PCAN_USB_CMD_FUNC		0
+#define PCAN_USB_CMD_NUM		1
+#define PCAN_USB_CMD_ARGS		2
+#define PCAN_USB_CMD_ARGS_LEN		14
+#define PCAN_USB_CMD_LEN		(PCAN_USB_CMD_ARGS + \
+					 PCAN_USB_CMD_ARGS_LEN)
+
+/* PCAN-USB command timeout (ms.) */
+#define PCAN_USB_COMMAND_TIMEOUT	1000
+
+/* PCAN-USB startup timeout (ms.) */
+#define PCAN_USB_STARTUP_TIMEOUT	10
+
+/* PCAN-USB rx/tx buffers size */
+#define PCAN_USB_RX_BUFFER_SIZE		64
+#define PCAN_USB_TX_BUFFER_SIZE		64
+
+#define PCAN_USB_MSG_HEADER_LEN		2
+
+/* PCAN-USB adapter internal clock (MHz) */
+#define PCAN_USB_CRYSTAL_HZ		16000000
+
+/* PCAN-USB USB message record status/len field */
+#define PCAN_USB_STATUSLEN_TIMESTAMP	(1 << 7)
+#define PCAN_USB_STATUSLEN_INTERNAL	(1 << 6)
+#define PCAN_USB_STATUSLEN_EXT_ID	(1 << 5)
+#define PCAN_USB_STATUSLEN_RTR		(1 << 4)
+#define PCAN_USB_STATUSLEN_DLC		(0xf)
+
+/* PCAN-USB error flags */
+#define PCAN_USB_ERROR_TXFULL		0x01
+#define PCAN_USB_ERROR_RXQOVR		0x02
+#define PCAN_USB_ERROR_BUS_LIGHT	0x04
+#define PCAN_USB_ERROR_BUS_HEAVY	0x08
+#define PCAN_USB_ERROR_BUS_OFF		0x10
+#define PCAN_USB_ERROR_RXQEMPTY		0x20
+#define PCAN_USB_ERROR_QOVR		0x40
+#define PCAN_USB_ERROR_TXQFULL		0x80
+
+/* SJA1000 modes */
+#define SJA1000_MODE_NORMAL		0x00
+#define SJA1000_MODE_INIT		0x01
+
+/*
+ * tick duration = 42.666 us =>
+ * (tick_number * 44739243) >> 20 ~ (tick_number * 42666) / 1000
+ * accuracy = 10^-7
+ */
+#define PCAN_USB_TS_DIV_SHIFTER		20
+#define PCAN_USB_TS_US_PER_TICK		44739243
+
+/* PCAN-USB messages record types */
+#define PCAN_USB_REC_ERROR		1
+#define PCAN_USB_REC_ANALOG		2
+#define PCAN_USB_REC_BUSLOAD		3
+#define PCAN_USB_REC_TS			4
+#define PCAN_USB_REC_BUSEVT		5
+
+/* private to PCAN-USB adapter */
+struct pcan_usb {
+	struct peak_usb_device dev;
+	struct peak_time_ref time_ref;
+	struct timer_list restart_timer;
+};
+
+/* incoming message context for decoding */
+struct pcan_usb_msg_context {
+	u16 ts16;
+	u8 prev_ts8;
+	u8 *ptr;
+	u8 *end;
+	u8 rec_cnt;
+	u8 rec_idx;
+	u8 rec_data_idx;
+	struct net_device *netdev;
+	struct pcan_usb *pdev;
+};
+
+/*
+ * send a command
+ */
+static int pcan_usb_send_cmd(struct peak_usb_device *dev, u8 f, u8 n, u8 *p)
+{
+	int err;
+	int actual_length;
+
+	/* usb device unregistered? */
+	if (!(dev->state & PCAN_USB_STATE_CONNECTED))
+		return 0;
+
+	dev->cmd_buf[PCAN_USB_CMD_FUNC] = f;
+	dev->cmd_buf[PCAN_USB_CMD_NUM] = n;
+
+	if (p)
+		memcpy(dev->cmd_buf + PCAN_USB_CMD_ARGS,
+			p, PCAN_USB_CMD_ARGS_LEN);
+
+	err = usb_bulk_msg(dev->udev,
+			usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT),
+			dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length,
+			PCAN_USB_COMMAND_TIMEOUT);
+	if (err)
+		netdev_err(dev->netdev,
+			"sending cmd f=0x%x n=0x%x failure: %d\n",
+			f, n, err);
+	return err;
+}
+
+/*
+ * send a command then wait for its response
+ */
+static int pcan_usb_wait_rsp(struct peak_usb_device *dev, u8 f, u8 n, u8 *p)
+{
+	int err;
+	int actual_length;
+
+	/* usb device unregistered? */
+	if (!(dev->state & PCAN_USB_STATE_CONNECTED))
+		return 0;
+
+	/* first, send command */
+	err = pcan_usb_send_cmd(dev, f, n, NULL);
+	if (err)
+		return err;
+
+	err = usb_bulk_msg(dev->udev,
+		usb_rcvbulkpipe(dev->udev, PCAN_USB_EP_CMDIN),
+		dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length,
+		PCAN_USB_COMMAND_TIMEOUT);
+	if (err)
+		netdev_err(dev->netdev,
+			"waiting rsp f=0x%x n=0x%x failure: %d\n", f, n, err);
+	else if (p)
+		memcpy(p, dev->cmd_buf + PCAN_USB_CMD_ARGS,
+			PCAN_USB_CMD_ARGS_LEN);
+
+	return err;
+}
+
+static int pcan_usb_set_sja1000(struct peak_usb_device *dev, u8 mode)
+{
+	u8 args[PCAN_USB_CMD_ARGS_LEN] = {
+		[1] = mode,
+	};
+
+	return pcan_usb_send_cmd(dev, 9, 2, args);
+}
+
+static int pcan_usb_set_bus(struct peak_usb_device *dev, u8 onoff)
+{
+	u8 args[PCAN_USB_CMD_ARGS_LEN] = {
+		[0] = !!onoff,
+	};
+
+	return pcan_usb_send_cmd(dev, 3, 2, args);
+}
+
+static int pcan_usb_set_silent(struct peak_usb_device *dev, u8 onoff)
+{
+	u8 args[PCAN_USB_CMD_ARGS_LEN] = {
+		[0] = !!onoff,
+	};
+
+	return pcan_usb_send_cmd(dev, 3, 3, args);
+}
+
+static int pcan_usb_set_ext_vcc(struct peak_usb_device *dev, u8 onoff)
+{
+	u8 args[PCAN_USB_CMD_ARGS_LEN] = {
+		[0] = !!onoff,
+	};
+
+	return pcan_usb_send_cmd(dev, 10, 2, args);
+}
+
+/*
+ * set bittiming value to can
+ */
+static int pcan_usb_set_bittiming(struct peak_usb_device *dev,
+				  struct can_bittiming *bt)
+{
+	u8 args[PCAN_USB_CMD_ARGS_LEN];
+	u8 btr0, btr1;
+
+	btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
+	btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
+		(((bt->phase_seg2 - 1) & 0x7) << 4);
+	if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
+		btr1 |= 0x80;
+
+	netdev_info(dev->netdev, "setting BTR0=0x%02x BTR1=0x%02x\n",
+		btr0, btr1);
+
+	args[0] = btr1;
+	args[1] = btr0;
+
+	return pcan_usb_send_cmd(dev, 1, 2, args);
+}
+
+/*
+ * init/reset can
+ */
+static int pcan_usb_write_mode(struct peak_usb_device *dev, u8 onoff)
+{
+	int err;
+
+	err = pcan_usb_set_bus(dev, onoff);
+	if (err)
+		return err;
+
+	if (!onoff) {
+		err = pcan_usb_set_sja1000(dev, SJA1000_MODE_INIT);
+	} else {
+		/* the PCAN-USB needs time to init */
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule_timeout(msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT));
+	}
+
+	return err;
+}
+
+/*
+ * handle end of waiting for the device to reset
+ */
+static void pcan_usb_restart(unsigned long arg)
+{
+	/* notify candev and netdev */
+	peak_usb_restart_complete((struct peak_usb_device *)arg);
+}
+
+/*
+ * handle the submission of the restart urb
+ */
+static void pcan_usb_restart_pending(struct urb *urb)
+{
+	struct pcan_usb *pdev = urb->context;
+
+	/* the PCAN-USB needs time to restart */
+	mod_timer(&pdev->restart_timer,
+			jiffies + msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT));
+
+	/* can delete usb resources */
+	peak_usb_async_complete(urb);
+}
+
+/*
+ * handle asynchronous restart
+ */
+static int pcan_usb_restart_async(struct peak_usb_device *dev, struct urb *urb,
+				  u8 *buf)
+{
+	struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
+
+	if (timer_pending(&pdev->restart_timer))
+		return -EBUSY;
+
+	/* set bus on */
+	buf[PCAN_USB_CMD_FUNC] = 3;
+	buf[PCAN_USB_CMD_NUM] = 2;
+	buf[PCAN_USB_CMD_ARGS] = 1;
+
+	usb_fill_bulk_urb(urb, dev->udev,
+			usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT),
+			buf, PCAN_USB_CMD_LEN,
+			pcan_usb_restart_pending, pdev);
+
+	return usb_submit_urb(urb, GFP_ATOMIC);
+}
+
+/*
+ * read serial number from device
+ */
+static int pcan_usb_get_serial(struct peak_usb_device *dev, u32 *serial_number)
+{
+	u8 args[PCAN_USB_CMD_ARGS_LEN];
+	int err;
+
+	err = pcan_usb_wait_rsp(dev, 6, 1, args);
+	if (err) {
+		netdev_err(dev->netdev, "getting serial failure: %d\n", err);
+	} else if (serial_number) {
+		__le32 tmp32;
+
+		memcpy(&tmp32, args, 4);
+		*serial_number = le32_to_cpu(tmp32);
+	}
+
+	return err;
+}
+
+/*
+ * read device id from device
+ */
+static int pcan_usb_get_device_id(struct peak_usb_device *dev, u32 *device_id)
+{
+	u8 args[PCAN_USB_CMD_ARGS_LEN];
+	int err;
+
+	err = pcan_usb_wait_rsp(dev, 4, 1, args);
+	if (err)
+		netdev_err(dev->netdev, "getting device id failure: %d\n", err);
+	else if (device_id)
+		*device_id = args[0];
+
+	return err;
+}
+
+/*
+ * update current time ref with received timestamp
+ */
+static int pcan_usb_update_ts(struct pcan_usb_msg_context *mc)
+{
+	__le16 tmp16;
+
+	if ((mc->ptr+2) > mc->end)
+		return -EINVAL;
+
+	memcpy(&tmp16, mc->ptr, 2);
+
+	mc->ts16 = le16_to_cpu(tmp16);
+
+	if (mc->rec_idx > 0)
+		peak_usb_update_ts_now(&mc->pdev->time_ref, mc->ts16);
+	else
+		peak_usb_set_ts_now(&mc->pdev->time_ref, mc->ts16);
+
+	return 0;
+}
+
+/*
+ * decode received timestamp
+ */
+static int pcan_usb_decode_ts(struct pcan_usb_msg_context *mc, u8 first_packet)
+{
+	/* only 1st packet supplies a word timestamp */
+	if (first_packet) {
+		__le16 tmp16;
+
+		if ((mc->ptr + 2) > mc->end)
+			return -EINVAL;
+
+		memcpy(&tmp16, mc->ptr, 2);
+		mc->ptr += 2;
+
+		mc->ts16 = le16_to_cpu(tmp16);
+		mc->prev_ts8 = mc->ts16 & 0x00ff;
+	} else {
+		u8 ts8;
+
+		if ((mc->ptr + 1) > mc->end)
+			return -EINVAL;
+
+		ts8 = *mc->ptr++;
+
+		if (ts8 < mc->prev_ts8)
+			mc->ts16 += 0x100;
+
+		mc->ts16 &= 0xff00;
+		mc->ts16 |= ts8;
+		mc->prev_ts8 = ts8;
+	}
+
+	return 0;
+}
+
+static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n,
+				 u8 status_len)
+{
+	struct sk_buff *skb;
+	struct can_frame *cf;
+	struct timeval tv;
+	enum can_state new_state;
+
+	/* ignore this error until 1st ts received */
+	if (n == PCAN_USB_ERROR_QOVR)
+		if (!mc->pdev->time_ref.tick_count)
+			return 0;
+
+	new_state = mc->pdev->dev.can.state;
+
+	switch (mc->pdev->dev.can.state) {
+	case CAN_STATE_ERROR_ACTIVE:
+		if (n & PCAN_USB_ERROR_BUS_LIGHT) {
+			new_state = CAN_STATE_ERROR_WARNING;
+			break;
+		}
+
+	case CAN_STATE_ERROR_WARNING:
+		if (n & PCAN_USB_ERROR_BUS_HEAVY) {
+			new_state = CAN_STATE_ERROR_PASSIVE;
+			break;
+		}
+		if (n & PCAN_USB_ERROR_BUS_OFF) {
+			new_state = CAN_STATE_BUS_OFF;
+			break;
+		}
+		if (n & (PCAN_USB_ERROR_RXQOVR | PCAN_USB_ERROR_QOVR)) {
+			/*
+			 * trick to bypass next comparison and process other
+			 * errors
+			 */
+			new_state = CAN_STATE_MAX;
+			break;
+		}
+		if ((n & PCAN_USB_ERROR_BUS_LIGHT) == 0) {
+			/* no error (back to active state) */
+			mc->pdev->dev.can.state = CAN_STATE_ERROR_ACTIVE;
+			return 0;
+		}
+		break;
+
+	case CAN_STATE_ERROR_PASSIVE:
+		if (n & PCAN_USB_ERROR_BUS_OFF) {
+			new_state = CAN_STATE_BUS_OFF;
+			break;
+		}
+		if (n & PCAN_USB_ERROR_BUS_LIGHT) {
+			new_state = CAN_STATE_ERROR_WARNING;
+			break;
+		}
+		if (n & (PCAN_USB_ERROR_RXQOVR | PCAN_USB_ERROR_QOVR)) {
+			/*
+			 * trick to bypass next comparison and process other
+			 * errors
+			 */
+			new_state = CAN_STATE_MAX;
+			break;
+		}
+
+		if ((n & PCAN_USB_ERROR_BUS_HEAVY) == 0) {
+			/* no error (back to active state) */
+			mc->pdev->dev.can.state = CAN_STATE_ERROR_ACTIVE;
+			return 0;
+		}
+		break;
+
+	default:
+		/* do nothing waiting for restart */
+		return 0;
+	}
+
+	/* donot post any error if current state didn't change */
+	if (mc->pdev->dev.can.state == new_state)
+		return 0;
+
+	/* allocate an skb to store the error frame */
+	skb = alloc_can_err_skb(mc->netdev, &cf);
+	if (!skb)
+		return -ENOMEM;
+
+	switch (new_state) {
+	case CAN_STATE_BUS_OFF:
+		cf->can_id |= CAN_ERR_BUSOFF;
+		mc->pdev->dev.can.can_stats.bus_off++;
+		can_bus_off(mc->netdev);
+		break;
+
+	case CAN_STATE_ERROR_PASSIVE:
+		cf->can_id |= CAN_ERR_CRTL;
+		cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE |
+			       CAN_ERR_CRTL_RX_PASSIVE;
+		mc->pdev->dev.can.can_stats.error_passive++;
+		break;
+
+	case CAN_STATE_ERROR_WARNING:
+		cf->can_id |= CAN_ERR_CRTL;
+		cf->data[1] |= CAN_ERR_CRTL_TX_WARNING |
+			       CAN_ERR_CRTL_RX_WARNING;
+		mc->pdev->dev.can.can_stats.error_warning++;
+		break;
+
+	default:
+		/* CAN_STATE_MAX (trick to handle other errors) */
+		cf->can_id |= CAN_ERR_CRTL;
+		cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
+		mc->netdev->stats.rx_over_errors++;
+		mc->netdev->stats.rx_errors++;
+
+		new_state = mc->pdev->dev.can.state;
+		break;
+	}
+
+	mc->pdev->dev.can.state = new_state;
+
+	if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) {
+		struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
+
+		peak_usb_get_ts_tv(&mc->pdev->time_ref, mc->ts16, &tv);
+		hwts->hwtstamp = timeval_to_ktime(tv);
+	}
+
+	netif_rx(skb);
+	mc->netdev->stats.rx_packets++;
+	mc->netdev->stats.rx_bytes += cf->can_dlc;
+
+	return 0;
+}
+
+/*
+ * decode non-data usb message
+ */
+static int pcan_usb_decode_status(struct pcan_usb_msg_context *mc,
+				  u8 status_len)
+{
+	u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC;
+	u8 f, n;
+	int err;
+
+	/* check whether function and number can be read */
+	if ((mc->ptr + 2) > mc->end)
+		return -EINVAL;
+
+	f = mc->ptr[PCAN_USB_CMD_FUNC];
+	n = mc->ptr[PCAN_USB_CMD_NUM];
+	mc->ptr += PCAN_USB_CMD_ARGS;
+
+	if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) {
+		int err = pcan_usb_decode_ts(mc, !mc->rec_idx);
+
+		if (err)
+			return err;
+	}
+
+	switch (f) {
+	case PCAN_USB_REC_ERROR:
+		err = pcan_usb_decode_error(mc, n, status_len);
+		if (err)
+			return err;
+		break;
+
+	case PCAN_USB_REC_ANALOG:
+		/* analog values (ignored) */
+		rec_len = 2;
+		break;
+
+	case PCAN_USB_REC_BUSLOAD:
+		/* bus load (ignored) */
+		rec_len = 1;
+		break;
+
+	case PCAN_USB_REC_TS:
+		/* only timestamp */
+		if (pcan_usb_update_ts(mc))
+			return -EINVAL;
+		break;
+
+	case PCAN_USB_REC_BUSEVT:
+		/* error frame/bus event */
+		if (n & PCAN_USB_ERROR_TXQFULL)
+			netdev_dbg(mc->netdev, "device Tx queue full)\n");
+		break;
+	default:
+		netdev_err(mc->netdev, "unexpected function %u\n", f);
+		break;
+	}
+
+	if ((mc->ptr + rec_len) > mc->end)
+		return -EINVAL;
+
+	mc->ptr += rec_len;
+
+	return 0;
+}
+
+/*
+ * decode data usb message
+ */
+static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len)
+{
+	u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC;
+	struct sk_buff *skb;
+	struct can_frame *cf;
+	struct timeval tv;
+	struct skb_shared_hwtstamps *hwts;
+
+	skb = alloc_can_skb(mc->netdev, &cf);
+	if (!skb)
+		return -ENOMEM;
+
+	if (status_len & PCAN_USB_STATUSLEN_EXT_ID) {
+		__le32 tmp32;
+
+		if ((mc->ptr + 4) > mc->end)
+			goto decode_failed;
+
+		memcpy(&tmp32, mc->ptr, 4);
+		mc->ptr += 4;
+
+		cf->can_id = (le32_to_cpu(tmp32) >> 3) | CAN_EFF_FLAG;
+	} else {
+		__le16 tmp16;
+
+		if ((mc->ptr + 2) > mc->end)
+			goto decode_failed;
+
+		memcpy(&tmp16, mc->ptr, 2);
+		mc->ptr += 2;
+
+		cf->can_id = le16_to_cpu(tmp16) >> 5;
+	}
+
+	cf->can_dlc = get_can_dlc(rec_len);
+
+	/* first data packet timestamp is a word */
+	if (pcan_usb_decode_ts(mc, !mc->rec_data_idx))
+		goto decode_failed;
+
+	/* read data */
+	memset(cf->data, 0x0, sizeof(cf->data));
+	if (status_len & PCAN_USB_STATUSLEN_RTR) {
+		cf->can_id |= CAN_RTR_FLAG;
+	} else {
+		if ((mc->ptr + rec_len) > mc->end)
+			goto decode_failed;
+
+		memcpy(cf->data, mc->ptr, cf->can_dlc);
+		mc->ptr += rec_len;
+	}
+
+	/* convert timestamp into kernel time */
+	peak_usb_get_ts_tv(&mc->pdev->time_ref, mc->ts16, &tv);
+	hwts = skb_hwtstamps(skb);
+	hwts->hwtstamp = timeval_to_ktime(tv);
+
+	/* push the skb */
+	netif_rx(skb);
+
+	/* update statistics */
+	mc->netdev->stats.rx_packets++;
+	mc->netdev->stats.rx_bytes += cf->can_dlc;
+
+	return 0;
+
+decode_failed:
+	dev_kfree_skb(skb);
+	return -EINVAL;
+}
+
+/*
+ * process incoming message
+ */
+static int pcan_usb_decode_msg(struct peak_usb_device *dev, u8 *ibuf, u32 lbuf)
+{
+	struct pcan_usb_msg_context mc = {
+		.rec_cnt = ibuf[1],
+		.ptr = ibuf + PCAN_USB_MSG_HEADER_LEN,
+		.end = ibuf + lbuf,
+		.netdev = dev->netdev,
+		.pdev = container_of(dev, struct pcan_usb, dev),
+	};
+	int err;
+
+	for (err = 0; mc.rec_idx < mc.rec_cnt && !err; mc.rec_idx++) {
+		u8 sl = *mc.ptr++;
+
+		/* handle status and error frames here */
+		if (sl & PCAN_USB_STATUSLEN_INTERNAL) {
+			err = pcan_usb_decode_status(&mc, sl);
+		/* handle normal can frames here */
+		} else {
+			err = pcan_usb_decode_data(&mc, sl);
+			mc.rec_data_idx++;
+		}
+	}
+
+	return err;
+}
+
+/*
+ * process any incoming buffer
+ */
+static int pcan_usb_decode_buf(struct peak_usb_device *dev, struct urb *urb)
+{
+	int err = 0;
+
+	if (urb->actual_length > PCAN_USB_MSG_HEADER_LEN) {
+		err = pcan_usb_decode_msg(dev, urb->transfer_buffer,
+			urb->actual_length);
+
+	} else if (urb->actual_length > 0) {
+		netdev_err(dev->netdev, "usb message length error (%u)\n",
+			urb->actual_length);
+		err = -EINVAL;
+	}
+
+	return err;
+}
+
+/*
+ * process outgoing packet
+ */
+static int pcan_usb_encode_msg(struct peak_usb_device *dev, struct sk_buff *skb,
+			       u8 *obuf, size_t *size)
+{
+	struct net_device *netdev = dev->netdev;
+	struct net_device_stats *stats = &netdev->stats;
+	struct can_frame *cf = (struct can_frame *)skb->data;
+	u8 *pc;
+
+	obuf[0] = 2;
+	obuf[1] = 1;
+
+	pc = obuf + PCAN_USB_MSG_HEADER_LEN;
+
+	/* status/len byte */
+	*pc = cf->can_dlc;
+	if (cf->can_id & CAN_RTR_FLAG)
+		*pc |= PCAN_USB_STATUSLEN_RTR;
+
+	/* can id */
+	if (cf->can_id & CAN_EFF_FLAG) {
+		__le32 tmp32 = cpu_to_le32((cf->can_id & CAN_ERR_MASK) << 3);
+
+		*pc |= PCAN_USB_STATUSLEN_EXT_ID;
+		memcpy(++pc, &tmp32, 4);
+		pc += 4;
+	} else {
+		__le16 tmp16 = cpu_to_le16((cf->can_id & CAN_ERR_MASK) << 5);
+
+		memcpy(++pc, &tmp16, 2);
+		pc += 2;
+	}
+
+	/* can data */
+	if (!(cf->can_id & CAN_RTR_FLAG)) {
+		memcpy(pc, cf->data, cf->can_dlc);
+		pc += cf->can_dlc;
+	}
+
+	obuf[(*size)-1] = (u8)(stats->tx_packets & 0xff);
+
+	return 0;
+}
+
+/*
+ * start interface
+ */
+static int pcan_usb_start(struct peak_usb_device *dev)
+{
+	struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
+
+	/* number of bits used in timestamps read from adapter struct */
+	peak_usb_init_time_ref(&pdev->time_ref, &pcan_usb);
+
+	/* if revision greater than 3, can put silent mode on/off */
+	if (dev->device_rev > 3) {
+		int err;
+
+		err = pcan_usb_set_silent(dev,
+				dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY);
+		if (err)
+			return err;
+	}
+
+	return pcan_usb_set_ext_vcc(dev, 0);
+}
+
+static int pcan_usb_init(struct peak_usb_device *dev)
+{
+	struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
+	u32 serial_number;
+	int err;
+
+	/* initialize a timer needed to wait for hardware restart */
+	init_timer(&pdev->restart_timer);
+	pdev->restart_timer.function = pcan_usb_restart;
+	pdev->restart_timer.data = (unsigned long)dev;
+
+	/*
+	 * explicit use of dev_xxx() instead of netdev_xxx() here:
+	 * information displayed are related to the device itself, not
+	 * to the canx netdevice.
+	 */
+	err = pcan_usb_get_serial(dev, &serial_number);
+	if (err) {
+		dev_err(dev->netdev->dev.parent,
+			"unable to read %s serial number (err %d)\n",
+			pcan_usb.name, err);
+		return err;
+	}
+
+	dev_info(dev->netdev->dev.parent,
+		 "PEAK-System %s adapter hwrev %u serial %08X (%u channel)\n",
+		 pcan_usb.name, dev->device_rev, serial_number,
+		 pcan_usb.ctrl_count);
+
+	return 0;
+}
+
+/*
+ * probe function for new PCAN-USB usb interface
+ */
+static int pcan_usb_probe(struct usb_interface *intf)
+{
+	struct usb_host_interface *if_desc;
+	int i;
+
+	if_desc = intf->altsetting;
+
+	/* check interface endpoint addresses */
+	for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
+		struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
+
+		switch (ep->bEndpointAddress) {
+		case PCAN_USB_EP_CMDOUT:
+		case PCAN_USB_EP_CMDIN:
+		case PCAN_USB_EP_MSGOUT:
+		case PCAN_USB_EP_MSGIN:
+			break;
+		default:
+			return -ENODEV;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * describe the PCAN-USB adapter
+ */
+const struct peak_usb_adapter pcan_usb = {
+	.name = "PCAN-USB",
+	.device_id = PCAN_USB_PRODUCT_ID,
+	.ctrl_count = 1,
+	.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
+	.clock = {
+		.freq = PCAN_USB_CRYSTAL_HZ / 2 ,
+	},
+	.bittiming_const = {
+		.name = "pcan_usb",
+		.tseg1_min = 1,
+		.tseg1_max = 16,
+		.tseg2_min = 1,
+		.tseg2_max = 8,
+		.sjw_max = 4,
+		.brp_min = 1,
+		.brp_max = 64,
+		.brp_inc = 1,
+	},
+
+	/* size of device private data */
+	.sizeof_dev_private = sizeof(struct pcan_usb),
+
+	/* timestamps usage */
+	.ts_used_bits = 16,
+	.ts_period = 24575, /* calibration period in ts. */
+	.us_per_ts_scale = PCAN_USB_TS_US_PER_TICK, /* us=(ts*scale) */
+	.us_per_ts_shift = PCAN_USB_TS_DIV_SHIFTER, /*  >> shift     */
+
+	/* give here messages in/out endpoints */
+	.ep_msg_in = PCAN_USB_EP_MSGIN,
+	.ep_msg_out = {PCAN_USB_EP_MSGOUT},
+
+	/* size of rx/tx usb buffers */
+	.rx_buffer_size = PCAN_USB_RX_BUFFER_SIZE,
+	.tx_buffer_size = PCAN_USB_TX_BUFFER_SIZE,
+
+	/* device callbacks */
+	.intf_probe = pcan_usb_probe,
+	.dev_init = pcan_usb_init,
+	.dev_set_bus = pcan_usb_write_mode,
+	.dev_set_bittiming = pcan_usb_set_bittiming,
+	.dev_get_device_id = pcan_usb_get_device_id,
+	.dev_decode_buf = pcan_usb_decode_buf,
+	.dev_encode_msg = pcan_usb_encode_msg,
+	.dev_start = pcan_usb_start,
+	.dev_restart_async = pcan_usb_restart_async,
+};
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
new file mode 100644
index 000000000..7921cff93
--- /dev/null
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
@@ -0,0 +1,1001 @@
+/*
+ * CAN driver for PEAK System USB adapters
+ * Derived from the PCAN project file driver/src/pcan_usb_core.c
+ *
+ * Copyright (C) 2003-2010 PEAK System-Technik GmbH
+ * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com>
+ *
+ * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de>
+ *
+ * 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 of the License.
+ *
+ * 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.
+ */
+#include <linux/init.h>
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+#include "pcan_usb_core.h"
+
+MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
+MODULE_DESCRIPTION("CAN driver for PEAK-System USB adapters");
+MODULE_LICENSE("GPL v2");
+
+/* Table of devices that work with this driver */
+static struct usb_device_id peak_usb_table[] = {
+	{USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USB_PRODUCT_ID)},
+	{USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBPRO_PRODUCT_ID)},
+	{USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBFD_PRODUCT_ID)},
+	{USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBPROFD_PRODUCT_ID)},
+	{} /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, peak_usb_table);
+
+/* List of supported PCAN-USB adapters (NULL terminated list) */
+static const struct peak_usb_adapter *const peak_usb_adapters_list[] = {
+	&pcan_usb,
+	&pcan_usb_pro,
+	&pcan_usb_fd,
+	&pcan_usb_pro_fd,
+};
+
+/*
+ * dump memory
+ */
+#define DUMP_WIDTH	16
+void pcan_dump_mem(char *prompt, void *p, int l)
+{
+	pr_info("%s dumping %s (%d bytes):\n",
+		PCAN_USB_DRIVER_NAME, prompt ? prompt : "memory", l);
+	print_hex_dump(KERN_INFO, PCAN_USB_DRIVER_NAME " ", DUMP_PREFIX_NONE,
+		       DUMP_WIDTH, 1, p, l, false);
+}
+
+/*
+ * initialize a time_ref object with usb adapter own settings
+ */
+void peak_usb_init_time_ref(struct peak_time_ref *time_ref,
+			    const struct peak_usb_adapter *adapter)
+{
+	if (time_ref) {
+		memset(time_ref, 0, sizeof(struct peak_time_ref));
+		time_ref->adapter = adapter;
+	}
+}
+
+static void peak_usb_add_us(struct timeval *tv, u32 delta_us)
+{
+	/* number of s. to add to final time */
+	u32 delta_s = delta_us / 1000000;
+
+	delta_us -= delta_s * 1000000;
+
+	tv->tv_usec += delta_us;
+	if (tv->tv_usec >= 1000000) {
+		tv->tv_usec -= 1000000;
+		delta_s++;
+	}
+	tv->tv_sec += delta_s;
+}
+
+/*
+ * sometimes, another now may be  more recent than current one...
+ */
+void peak_usb_update_ts_now(struct peak_time_ref *time_ref, u32 ts_now)
+{
+	time_ref->ts_dev_2 = ts_now;
+
+	/* should wait at least two passes before computing */
+	if (time_ref->tv_host.tv_sec > 0) {
+		u32 delta_ts = time_ref->ts_dev_2 - time_ref->ts_dev_1;
+
+		if (time_ref->ts_dev_2 < time_ref->ts_dev_1)
+			delta_ts &= (1 << time_ref->adapter->ts_used_bits) - 1;
+
+		time_ref->ts_total += delta_ts;
+	}
+}
+
+/*
+ * register device timestamp as now
+ */
+void peak_usb_set_ts_now(struct peak_time_ref *time_ref, u32 ts_now)
+{
+	if (time_ref->tv_host_0.tv_sec == 0) {
+		/* use monotonic clock to correctly compute further deltas */
+		time_ref->tv_host_0 = ktime_to_timeval(ktime_get());
+		time_ref->tv_host.tv_sec = 0;
+	} else {
+		/*
+		 * delta_us should not be >= 2^32 => delta_s should be < 4294
+		 * handle 32-bits wrapping here: if count of s. reaches 4200,
+		 * reset counters and change time base
+		 */
+		if (time_ref->tv_host.tv_sec != 0) {
+			u32 delta_s = time_ref->tv_host.tv_sec
+						- time_ref->tv_host_0.tv_sec;
+			if (delta_s > 4200) {
+				time_ref->tv_host_0 = time_ref->tv_host;
+				time_ref->ts_total = 0;
+			}
+		}
+
+		time_ref->tv_host = ktime_to_timeval(ktime_get());
+		time_ref->tick_count++;
+	}
+
+	time_ref->ts_dev_1 = time_ref->ts_dev_2;
+	peak_usb_update_ts_now(time_ref, ts_now);
+}
+
+/*
+ * compute timeval according to current ts and time_ref data
+ */
+void peak_usb_get_ts_tv(struct peak_time_ref *time_ref, u32 ts,
+			struct timeval *tv)
+{
+	/* protect from getting timeval before setting now */
+	if (time_ref->tv_host.tv_sec > 0) {
+		u64 delta_us;
+
+		delta_us = ts - time_ref->ts_dev_2;
+		if (ts < time_ref->ts_dev_2)
+			delta_us &= (1 << time_ref->adapter->ts_used_bits) - 1;
+
+		delta_us += time_ref->ts_total;
+
+		delta_us *= time_ref->adapter->us_per_ts_scale;
+		delta_us >>= time_ref->adapter->us_per_ts_shift;
+
+		*tv = time_ref->tv_host_0;
+		peak_usb_add_us(tv, (u32)delta_us);
+	} else {
+		*tv = ktime_to_timeval(ktime_get());
+	}
+}
+
+/*
+ * post received skb after having set any hw timestamp
+ */
+int peak_usb_netif_rx(struct sk_buff *skb,
+		      struct peak_time_ref *time_ref, u32 ts_low, u32 ts_high)
+{
+	struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
+	struct timeval tv;
+
+	peak_usb_get_ts_tv(time_ref, ts_low, &tv);
+	hwts->hwtstamp = timeval_to_ktime(tv);
+
+	return netif_rx(skb);
+}
+
+/*
+ * callback for bulk Rx urb
+ */
+static void peak_usb_read_bulk_callback(struct urb *urb)
+{
+	struct peak_usb_device *dev = urb->context;
+	struct net_device *netdev;
+	int err;
+
+	netdev = dev->netdev;
+
+	if (!netif_device_present(netdev))
+		return;
+
+	/* check reception status */
+	switch (urb->status) {
+	case 0:
+		/* success */
+		break;
+
+	case -EILSEQ:
+	case -ENOENT:
+	case -ECONNRESET:
+	case -ESHUTDOWN:
+		return;
+
+	default:
+		if (net_ratelimit())
+			netdev_err(netdev,
+				   "Rx urb aborted (%d)\n", urb->status);
+		goto resubmit_urb;
+	}
+
+	/* protect from any incoming empty msgs */
+	if ((urb->actual_length > 0) && (dev->adapter->dev_decode_buf)) {
+		/* handle these kinds of msgs only if _start callback called */
+		if (dev->state & PCAN_USB_STATE_STARTED) {
+			err = dev->adapter->dev_decode_buf(dev, urb);
+			if (err)
+				pcan_dump_mem("received usb message",
+					      urb->transfer_buffer,
+					      urb->transfer_buffer_length);
+		}
+	}
+
+resubmit_urb:
+	usb_fill_bulk_urb(urb, dev->udev,
+		usb_rcvbulkpipe(dev->udev, dev->ep_msg_in),
+		urb->transfer_buffer, dev->adapter->rx_buffer_size,
+		peak_usb_read_bulk_callback, dev);
+
+	usb_anchor_urb(urb, &dev->rx_submitted);
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+	if (!err)
+		return;
+
+	usb_unanchor_urb(urb);
+
+	if (err == -ENODEV)
+		netif_device_detach(netdev);
+	else
+		netdev_err(netdev, "failed resubmitting read bulk urb: %d\n",
+			   err);
+}
+
+/*
+ * callback for bulk Tx urb
+ */
+static void peak_usb_write_bulk_callback(struct urb *urb)
+{
+	struct peak_tx_urb_context *context = urb->context;
+	struct peak_usb_device *dev;
+	struct net_device *netdev;
+
+	BUG_ON(!context);
+
+	dev = context->dev;
+	netdev = dev->netdev;
+
+	atomic_dec(&dev->active_tx_urbs);
+
+	if (!netif_device_present(netdev))
+		return;
+
+	/* check tx status */
+	switch (urb->status) {
+	case 0:
+		/* transmission complete */
+		netdev->stats.tx_packets++;
+		netdev->stats.tx_bytes += context->data_len;
+
+		/* prevent tx timeout */
+		netdev->trans_start = jiffies;
+		break;
+
+	default:
+		if (net_ratelimit())
+			netdev_err(netdev, "Tx urb aborted (%d)\n",
+				   urb->status);
+	case -EPROTO:
+	case -ENOENT:
+	case -ECONNRESET:
+	case -ESHUTDOWN:
+
+		break;
+	}
+
+	/* should always release echo skb and corresponding context */
+	can_get_echo_skb(netdev, context->echo_index);
+	context->echo_index = PCAN_USB_MAX_TX_URBS;
+
+	/* do wakeup tx queue in case of success only */
+	if (!urb->status)
+		netif_wake_queue(netdev);
+}
+
+/*
+ * called by netdev to send one skb on the CAN interface.
+ */
+static netdev_tx_t peak_usb_ndo_start_xmit(struct sk_buff *skb,
+					   struct net_device *netdev)
+{
+	struct peak_usb_device *dev = netdev_priv(netdev);
+	struct peak_tx_urb_context *context = NULL;
+	struct net_device_stats *stats = &netdev->stats;
+	struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
+	struct urb *urb;
+	u8 *obuf;
+	int i, err;
+	size_t size = dev->adapter->tx_buffer_size;
+
+	if (can_dropped_invalid_skb(netdev, skb))
+		return NETDEV_TX_OK;
+
+	for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++)
+		if (dev->tx_contexts[i].echo_index == PCAN_USB_MAX_TX_URBS) {
+			context = dev->tx_contexts + i;
+			break;
+		}
+
+	if (!context) {
+		/* should not occur except during restart */
+		return NETDEV_TX_BUSY;
+	}
+
+	urb = context->urb;
+	obuf = urb->transfer_buffer;
+
+	err = dev->adapter->dev_encode_msg(dev, skb, obuf, &size);
+	if (err) {
+		if (net_ratelimit())
+			netdev_err(netdev, "packet dropped\n");
+		dev_kfree_skb(skb);
+		stats->tx_dropped++;
+		return NETDEV_TX_OK;
+	}
+
+	context->echo_index = i;
+
+	/* Note: this works with CANFD frames too */
+	context->data_len = cfd->len;
+
+	usb_anchor_urb(urb, &dev->tx_submitted);
+
+	can_put_echo_skb(skb, netdev, context->echo_index);
+
+	atomic_inc(&dev->active_tx_urbs);
+
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+	if (err) {
+		can_free_echo_skb(netdev, context->echo_index);
+
+		usb_unanchor_urb(urb);
+
+		/* this context is not used in fact */
+		context->echo_index = PCAN_USB_MAX_TX_URBS;
+
+		atomic_dec(&dev->active_tx_urbs);
+
+		switch (err) {
+		case -ENODEV:
+			netif_device_detach(netdev);
+			break;
+		default:
+			netdev_warn(netdev, "tx urb submitting failed err=%d\n",
+				    err);
+		case -ENOENT:
+			/* cable unplugged */
+			stats->tx_dropped++;
+		}
+	} else {
+		netdev->trans_start = jiffies;
+
+		/* slow down tx path */
+		if (atomic_read(&dev->active_tx_urbs) >= PCAN_USB_MAX_TX_URBS)
+			netif_stop_queue(netdev);
+	}
+
+	return NETDEV_TX_OK;
+}
+
+/*
+ * start the CAN interface.
+ * Rx and Tx urbs are allocated here. Rx urbs are submitted here.
+ */
+static int peak_usb_start(struct peak_usb_device *dev)
+{
+	struct net_device *netdev = dev->netdev;
+	int err, i;
+
+	for (i = 0; i < PCAN_USB_MAX_RX_URBS; i++) {
+		struct urb *urb;
+		u8 *buf;
+
+		/* create a URB, and a buffer for it, to receive usb messages */
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!urb) {
+			netdev_err(netdev, "No memory left for URBs\n");
+			err = -ENOMEM;
+			break;
+		}
+
+		buf = kmalloc(dev->adapter->rx_buffer_size, GFP_KERNEL);
+		if (!buf) {
+			usb_free_urb(urb);
+			err = -ENOMEM;
+			break;
+		}
+
+		usb_fill_bulk_urb(urb, dev->udev,
+			usb_rcvbulkpipe(dev->udev, dev->ep_msg_in),
+			buf, dev->adapter->rx_buffer_size,
+			peak_usb_read_bulk_callback, dev);
+
+		/* ask last usb_free_urb() to also kfree() transfer_buffer */
+		urb->transfer_flags |= URB_FREE_BUFFER;
+		usb_anchor_urb(urb, &dev->rx_submitted);
+
+		err = usb_submit_urb(urb, GFP_KERNEL);
+		if (err) {
+			if (err == -ENODEV)
+				netif_device_detach(dev->netdev);
+
+			usb_unanchor_urb(urb);
+			kfree(buf);
+			usb_free_urb(urb);
+			break;
+		}
+
+		/* drop reference, USB core will take care of freeing it */
+		usb_free_urb(urb);
+	}
+
+	/* did we submit any URBs? Warn if we was not able to submit all urbs */
+	if (i < PCAN_USB_MAX_RX_URBS) {
+		if (i == 0) {
+			netdev_err(netdev, "couldn't setup any rx URB\n");
+			return err;
+		}
+
+		netdev_warn(netdev, "rx performance may be slow\n");
+	}
+
+	/* pre-alloc tx buffers and corresponding urbs */
+	for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
+		struct peak_tx_urb_context *context;
+		struct urb *urb;
+		u8 *buf;
+
+		/* create a URB and a buffer for it, to transmit usb messages */
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!urb) {
+			netdev_err(netdev, "No memory left for URBs\n");
+			err = -ENOMEM;
+			break;
+		}
+
+		buf = kmalloc(dev->adapter->tx_buffer_size, GFP_KERNEL);
+		if (!buf) {
+			usb_free_urb(urb);
+			err = -ENOMEM;
+			break;
+		}
+
+		context = dev->tx_contexts + i;
+		context->dev = dev;
+		context->urb = urb;
+
+		usb_fill_bulk_urb(urb, dev->udev,
+			usb_sndbulkpipe(dev->udev, dev->ep_msg_out),
+			buf, dev->adapter->tx_buffer_size,
+			peak_usb_write_bulk_callback, context);
+
+		/* ask last usb_free_urb() to also kfree() transfer_buffer */
+		urb->transfer_flags |= URB_FREE_BUFFER;
+	}
+
+	/* warn if we were not able to allocate enough tx contexts */
+	if (i < PCAN_USB_MAX_TX_URBS) {
+		if (i == 0) {
+			netdev_err(netdev, "couldn't setup any tx URB\n");
+			goto err_tx;
+		}
+
+		netdev_warn(netdev, "tx performance may be slow\n");
+	}
+
+	if (dev->adapter->dev_start) {
+		err = dev->adapter->dev_start(dev);
+		if (err)
+			goto err_adapter;
+	}
+
+	dev->state |= PCAN_USB_STATE_STARTED;
+
+	/* can set bus on now */
+	if (dev->adapter->dev_set_bus) {
+		err = dev->adapter->dev_set_bus(dev, 1);
+		if (err)
+			goto err_adapter;
+	}
+
+	dev->can.state = CAN_STATE_ERROR_ACTIVE;
+
+	return 0;
+
+err_adapter:
+	if (err == -ENODEV)
+		netif_device_detach(dev->netdev);
+
+	netdev_warn(netdev, "couldn't submit control: %d\n", err);
+
+	for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
+		usb_free_urb(dev->tx_contexts[i].urb);
+		dev->tx_contexts[i].urb = NULL;
+	}
+err_tx:
+	usb_kill_anchored_urbs(&dev->rx_submitted);
+
+	return err;
+}
+
+/*
+ * called by netdev to open the corresponding CAN interface.
+ */
+static int peak_usb_ndo_open(struct net_device *netdev)
+{
+	struct peak_usb_device *dev = netdev_priv(netdev);
+	int err;
+
+	/* common open */
+	err = open_candev(netdev);
+	if (err)
+		return err;
+
+	/* finally start device */
+	err = peak_usb_start(dev);
+	if (err) {
+		netdev_err(netdev, "couldn't start device: %d\n", err);
+		close_candev(netdev);
+		return err;
+	}
+
+	netif_start_queue(netdev);
+
+	return 0;
+}
+
+/*
+ * unlink in-flight Rx and Tx urbs and free their memory.
+ */
+static void peak_usb_unlink_all_urbs(struct peak_usb_device *dev)
+{
+	int i;
+
+	/* free all Rx (submitted) urbs */
+	usb_kill_anchored_urbs(&dev->rx_submitted);
+
+	/* free unsubmitted Tx urbs first */
+	for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
+		struct urb *urb = dev->tx_contexts[i].urb;
+
+		if (!urb ||
+		    dev->tx_contexts[i].echo_index != PCAN_USB_MAX_TX_URBS) {
+			/*
+			 * this urb is already released or always submitted,
+			 * let usb core free by itself
+			 */
+			continue;
+		}
+
+		usb_free_urb(urb);
+		dev->tx_contexts[i].urb = NULL;
+	}
+
+	/* then free all submitted Tx urbs */
+	usb_kill_anchored_urbs(&dev->tx_submitted);
+	atomic_set(&dev->active_tx_urbs, 0);
+}
+
+/*
+ * called by netdev to close the corresponding CAN interface.
+ */
+static int peak_usb_ndo_stop(struct net_device *netdev)
+{
+	struct peak_usb_device *dev = netdev_priv(netdev);
+
+	dev->state &= ~PCAN_USB_STATE_STARTED;
+	netif_stop_queue(netdev);
+
+	/* unlink all pending urbs and free used memory */
+	peak_usb_unlink_all_urbs(dev);
+
+	if (dev->adapter->dev_stop)
+		dev->adapter->dev_stop(dev);
+
+	close_candev(netdev);
+
+	dev->can.state = CAN_STATE_STOPPED;
+
+	/* can set bus off now */
+	if (dev->adapter->dev_set_bus) {
+		int err = dev->adapter->dev_set_bus(dev, 0);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+/*
+ * handle end of waiting for the device to reset
+ */
+void peak_usb_restart_complete(struct peak_usb_device *dev)
+{
+	/* finally MUST update can state */
+	dev->can.state = CAN_STATE_ERROR_ACTIVE;
+
+	/* netdev queue can be awaken now */
+	netif_wake_queue(dev->netdev);
+}
+
+void peak_usb_async_complete(struct urb *urb)
+{
+	kfree(urb->transfer_buffer);
+	usb_free_urb(urb);
+}
+
+/*
+ * device (auto-)restart mechanism runs in a timer context =>
+ * MUST handle restart with asynchronous usb transfers
+ */
+static int peak_usb_restart(struct peak_usb_device *dev)
+{
+	struct urb *urb;
+	int err;
+	u8 *buf;
+
+	/*
+	 * if device doesn't define any asynchronous restart handler, simply
+	 * wake the netdev queue up
+	 */
+	if (!dev->adapter->dev_restart_async) {
+		peak_usb_restart_complete(dev);
+		return 0;
+	}
+
+	/* first allocate a urb to handle the asynchronous steps */
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!urb) {
+		netdev_err(dev->netdev, "no memory left for urb\n");
+		return -ENOMEM;
+	}
+
+	/* also allocate enough space for the commands to send */
+	buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_ATOMIC);
+	if (!buf) {
+		usb_free_urb(urb);
+		return -ENOMEM;
+	}
+
+	/* call the device specific handler for the restart */
+	err = dev->adapter->dev_restart_async(dev, urb, buf);
+	if (!err)
+		return 0;
+
+	kfree(buf);
+	usb_free_urb(urb);
+
+	return err;
+}
+
+/*
+ * candev callback used to change CAN mode.
+ * Warning: this is called from a timer context!
+ */
+static int peak_usb_set_mode(struct net_device *netdev, enum can_mode mode)
+{
+	struct peak_usb_device *dev = netdev_priv(netdev);
+	int err = 0;
+
+	switch (mode) {
+	case CAN_MODE_START:
+		err = peak_usb_restart(dev);
+		if (err)
+			netdev_err(netdev, "couldn't start device (err %d)\n",
+				   err);
+		break;
+
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return err;
+}
+
+/*
+ * candev callback used to set device nominal/arbitration bitrate.
+ */
+static int peak_usb_set_bittiming(struct net_device *netdev)
+{
+	struct peak_usb_device *dev = netdev_priv(netdev);
+	const struct peak_usb_adapter *pa = dev->adapter;
+
+	if (pa->dev_set_bittiming) {
+		struct can_bittiming *bt = &dev->can.bittiming;
+		int err = pa->dev_set_bittiming(dev, bt);
+
+		if (err)
+			netdev_info(netdev, "couldn't set bitrate (err %d)\n",
+				    err);
+		return err;
+	}
+
+	return 0;
+}
+
+/*
+ * candev callback used to set device data bitrate.
+ */
+static int peak_usb_set_data_bittiming(struct net_device *netdev)
+{
+	struct peak_usb_device *dev = netdev_priv(netdev);
+	const struct peak_usb_adapter *pa = dev->adapter;
+
+	if (pa->dev_set_data_bittiming) {
+		struct can_bittiming *bt = &dev->can.data_bittiming;
+		int err = pa->dev_set_data_bittiming(dev, bt);
+
+		if (err)
+			netdev_info(netdev,
+				    "couldn't set data bitrate (err %d)\n",
+				    err);
+
+		return err;
+	}
+
+	return 0;
+}
+
+static const struct net_device_ops peak_usb_netdev_ops = {
+	.ndo_open = peak_usb_ndo_open,
+	.ndo_stop = peak_usb_ndo_stop,
+	.ndo_start_xmit = peak_usb_ndo_start_xmit,
+	.ndo_change_mtu = can_change_mtu,
+};
+
+/*
+ * create one device which is attached to CAN controller #ctrl_idx of the
+ * usb adapter.
+ */
+static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter,
+			       struct usb_interface *intf, int ctrl_idx)
+{
+	struct usb_device *usb_dev = interface_to_usbdev(intf);
+	int sizeof_candev = peak_usb_adapter->sizeof_dev_private;
+	struct peak_usb_device *dev;
+	struct net_device *netdev;
+	int i, err;
+	u16 tmp16;
+
+	if (sizeof_candev < sizeof(struct peak_usb_device))
+		sizeof_candev = sizeof(struct peak_usb_device);
+
+	netdev = alloc_candev(sizeof_candev, PCAN_USB_MAX_TX_URBS);
+	if (!netdev) {
+		dev_err(&intf->dev, "%s: couldn't alloc candev\n",
+			PCAN_USB_DRIVER_NAME);
+		return -ENOMEM;
+	}
+
+	dev = netdev_priv(netdev);
+
+	/* allocate a buffer large enough to send commands */
+	dev->cmd_buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_KERNEL);
+	if (!dev->cmd_buf) {
+		err = -ENOMEM;
+		goto lbl_free_candev;
+	}
+
+	dev->udev = usb_dev;
+	dev->netdev = netdev;
+	dev->adapter = peak_usb_adapter;
+	dev->ctrl_idx = ctrl_idx;
+	dev->state = PCAN_USB_STATE_CONNECTED;
+
+	dev->ep_msg_in = peak_usb_adapter->ep_msg_in;
+	dev->ep_msg_out = peak_usb_adapter->ep_msg_out[ctrl_idx];
+
+	dev->can.clock = peak_usb_adapter->clock;
+	dev->can.bittiming_const = &peak_usb_adapter->bittiming_const;
+	dev->can.do_set_bittiming = peak_usb_set_bittiming;
+	dev->can.data_bittiming_const = &peak_usb_adapter->data_bittiming_const;
+	dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;
+	dev->can.do_set_mode = peak_usb_set_mode;
+	dev->can.do_get_berr_counter = peak_usb_adapter->do_get_berr_counter;
+	dev->can.ctrlmode_supported = peak_usb_adapter->ctrlmode_supported;
+
+	netdev->netdev_ops = &peak_usb_netdev_ops;
+
+	netdev->flags |= IFF_ECHO; /* we support local echo */
+
+	init_usb_anchor(&dev->rx_submitted);
+
+	init_usb_anchor(&dev->tx_submitted);
+	atomic_set(&dev->active_tx_urbs, 0);
+
+	for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++)
+		dev->tx_contexts[i].echo_index = PCAN_USB_MAX_TX_URBS;
+
+	dev->prev_siblings = usb_get_intfdata(intf);
+	usb_set_intfdata(intf, dev);
+
+	SET_NETDEV_DEV(netdev, &intf->dev);
+	netdev->dev_id = ctrl_idx;
+
+	err = register_candev(netdev);
+	if (err) {
+		dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
+		goto lbl_restore_intf_data;
+	}
+
+	if (dev->prev_siblings)
+		(dev->prev_siblings)->next_siblings = dev;
+
+	/* keep hw revision into the netdevice */
+	tmp16 = le16_to_cpu(usb_dev->descriptor.bcdDevice);
+	dev->device_rev = tmp16 >> 8;
+
+	if (dev->adapter->dev_init) {
+		err = dev->adapter->dev_init(dev);
+		if (err)
+			goto lbl_unregister_candev;
+	}
+
+	/* set bus off */
+	if (dev->adapter->dev_set_bus) {
+		err = dev->adapter->dev_set_bus(dev, 0);
+		if (err)
+			goto lbl_unregister_candev;
+	}
+
+	/* get device number early */
+	if (dev->adapter->dev_get_device_id)
+		dev->adapter->dev_get_device_id(dev, &dev->device_number);
+
+	netdev_info(netdev, "attached to %s channel %u (device %u)\n",
+			peak_usb_adapter->name, ctrl_idx, dev->device_number);
+
+	return 0;
+
+lbl_unregister_candev:
+	unregister_candev(netdev);
+
+lbl_restore_intf_data:
+	usb_set_intfdata(intf, dev->prev_siblings);
+	kfree(dev->cmd_buf);
+
+lbl_free_candev:
+	free_candev(netdev);
+
+	return err;
+}
+
+/*
+ * called by the usb core when the device is unplugged from the system
+ */
+static void peak_usb_disconnect(struct usb_interface *intf)
+{
+	struct peak_usb_device *dev;
+
+	/* unregister as many netdev devices as siblings */
+	for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) {
+		struct net_device *netdev = dev->netdev;
+		char name[IFNAMSIZ];
+
+		dev->state &= ~PCAN_USB_STATE_CONNECTED;
+		strncpy(name, netdev->name, IFNAMSIZ);
+
+		unregister_netdev(netdev);
+		free_candev(netdev);
+
+		kfree(dev->cmd_buf);
+		dev->next_siblings = NULL;
+		if (dev->adapter->dev_free)
+			dev->adapter->dev_free(dev);
+
+		dev_info(&intf->dev, "%s removed\n", name);
+	}
+
+	usb_set_intfdata(intf, NULL);
+}
+
+/*
+ * probe function for new PEAK-System devices
+ */
+static int peak_usb_probe(struct usb_interface *intf,
+			  const struct usb_device_id *id)
+{
+	struct usb_device *usb_dev = interface_to_usbdev(intf);
+	const u16 usb_id_product = le16_to_cpu(usb_dev->descriptor.idProduct);
+	const struct peak_usb_adapter *peak_usb_adapter = NULL;
+	int i, err = -ENOMEM;
+
+	usb_dev = interface_to_usbdev(intf);
+
+	/* get corresponding PCAN-USB adapter */
+	for (i = 0; i < ARRAY_SIZE(peak_usb_adapters_list); i++)
+		if (peak_usb_adapters_list[i]->device_id == usb_id_product) {
+			peak_usb_adapter = peak_usb_adapters_list[i];
+			break;
+		}
+
+	if (!peak_usb_adapter) {
+		/* should never come except device_id bad usage in this file */
+		pr_err("%s: didn't find device id. 0x%x in devices list\n",
+			PCAN_USB_DRIVER_NAME, usb_dev->descriptor.idProduct);
+		return -ENODEV;
+	}
+
+	/* got corresponding adapter: check if it handles current interface */
+	if (peak_usb_adapter->intf_probe) {
+		err = peak_usb_adapter->intf_probe(intf);
+		if (err)
+			return err;
+	}
+
+	for (i = 0; i < peak_usb_adapter->ctrl_count; i++) {
+		err = peak_usb_create_dev(peak_usb_adapter, intf, i);
+		if (err) {
+			/* deregister already created devices */
+			peak_usb_disconnect(intf);
+			break;
+		}
+	}
+
+	return err;
+}
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver peak_usb_driver = {
+	.name = PCAN_USB_DRIVER_NAME,
+	.disconnect = peak_usb_disconnect,
+	.probe = peak_usb_probe,
+	.id_table = peak_usb_table,
+};
+
+static int __init peak_usb_init(void)
+{
+	int err;
+
+	/* register this driver with the USB subsystem */
+	err = usb_register(&peak_usb_driver);
+	if (err)
+		pr_err("%s: usb_register failed (err %d)\n",
+			PCAN_USB_DRIVER_NAME, err);
+
+	return err;
+}
+
+static int peak_usb_do_device_exit(struct device *d, void *arg)
+{
+	struct usb_interface *intf = to_usb_interface(d);
+	struct peak_usb_device *dev;
+
+	/* stop as many netdev devices as siblings */
+	for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) {
+		struct net_device *netdev = dev->netdev;
+
+		if (netif_device_present(netdev))
+			if (dev->adapter->dev_exit)
+				dev->adapter->dev_exit(dev);
+	}
+
+	return 0;
+}
+
+static void __exit peak_usb_exit(void)
+{
+	int err;
+
+	/* last chance do send any synchronous commands here */
+	err = driver_for_each_device(&peak_usb_driver.drvwrap.driver, NULL,
+				     NULL, peak_usb_do_device_exit);
+	if (err)
+		pr_err("%s: failed to stop all can devices (err %d)\n",
+			PCAN_USB_DRIVER_NAME, err);
+
+	/* deregister this driver with the USB subsystem */
+	usb_deregister(&peak_usb_driver);
+
+	pr_info("%s: PCAN-USB interfaces driver unloaded\n",
+		PCAN_USB_DRIVER_NAME);
+}
+
+module_init(peak_usb_init);
+module_exit(peak_usb_exit);
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.h b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
new file mode 100644
index 000000000..9e624f05a
--- /dev/null
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
@@ -0,0 +1,157 @@
+/*
+ * CAN driver for PEAK System USB adapters
+ * Derived from the PCAN project file driver/src/pcan_usb_core.c
+ *
+ * Copyright (C) 2003-2010 PEAK System-Technik GmbH
+ * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com>
+ *
+ * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de>
+ *
+ * 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 of the License.
+ *
+ * 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.
+ */
+#ifndef PCAN_USB_CORE_H
+#define PCAN_USB_CORE_H
+
+/* PEAK-System vendor id. */
+#define PCAN_USB_VENDOR_ID		0x0c72
+
+/* supported device ids. */
+#define PCAN_USB_PRODUCT_ID		0x000c
+#define PCAN_USBPRO_PRODUCT_ID		0x000d
+#define PCAN_USBPROFD_PRODUCT_ID	0x0011
+#define PCAN_USBFD_PRODUCT_ID		0x0012
+
+#define PCAN_USB_DRIVER_NAME		"peak_usb"
+
+/* number of urbs that are submitted for rx/tx per channel */
+#define PCAN_USB_MAX_RX_URBS		4
+#define PCAN_USB_MAX_TX_URBS		10
+
+/* usb adapters maximum channels per usb interface */
+#define PCAN_USB_MAX_CHANNEL		2
+
+/* maximum length of the usb commands sent to/received from  the devices */
+#define PCAN_USB_MAX_CMD_LEN		32
+
+struct peak_usb_device;
+
+/* PEAK-System USB adapter descriptor */
+struct peak_usb_adapter {
+	char *name;
+	u32 device_id;
+	u32 ctrlmode_supported;
+	struct can_clock clock;
+	const struct can_bittiming_const bittiming_const;
+	const struct can_bittiming_const data_bittiming_const;
+	unsigned int ctrl_count;
+
+	int (*intf_probe)(struct usb_interface *intf);
+
+	int (*dev_init)(struct peak_usb_device *dev);
+	void (*dev_exit)(struct peak_usb_device *dev);
+	void (*dev_free)(struct peak_usb_device *dev);
+	int (*dev_open)(struct peak_usb_device *dev);
+	int (*dev_close)(struct peak_usb_device *dev);
+	int (*dev_set_bittiming)(struct peak_usb_device *dev,
+					struct can_bittiming *bt);
+	int (*dev_set_data_bittiming)(struct peak_usb_device *dev,
+				      struct can_bittiming *bt);
+	int (*dev_set_bus)(struct peak_usb_device *dev, u8 onoff);
+	int (*dev_get_device_id)(struct peak_usb_device *dev, u32 *device_id);
+	int (*dev_decode_buf)(struct peak_usb_device *dev, struct urb *urb);
+	int (*dev_encode_msg)(struct peak_usb_device *dev, struct sk_buff *skb,
+					u8 *obuf, size_t *size);
+	int (*dev_start)(struct peak_usb_device *dev);
+	int (*dev_stop)(struct peak_usb_device *dev);
+	int (*dev_restart_async)(struct peak_usb_device *dev, struct urb *urb,
+					u8 *buf);
+	int (*do_get_berr_counter)(const struct net_device *netdev,
+				   struct can_berr_counter *bec);
+	u8 ep_msg_in;
+	u8 ep_msg_out[PCAN_USB_MAX_CHANNEL];
+	u8 ts_used_bits;
+	u32 ts_period;
+	u8 us_per_ts_shift;
+	u32 us_per_ts_scale;
+
+	int rx_buffer_size;
+	int tx_buffer_size;
+	int sizeof_dev_private;
+};
+
+extern const struct peak_usb_adapter pcan_usb;
+extern const struct peak_usb_adapter pcan_usb_pro;
+extern const struct peak_usb_adapter pcan_usb_fd;
+extern const struct peak_usb_adapter pcan_usb_pro_fd;
+
+struct peak_time_ref {
+	struct timeval tv_host_0, tv_host;
+	u32 ts_dev_1, ts_dev_2;
+	u64 ts_total;
+	u32 tick_count;
+	const struct peak_usb_adapter *adapter;
+};
+
+struct peak_tx_urb_context {
+	struct peak_usb_device *dev;
+	u32 echo_index;
+	u8 data_len;
+	struct urb *urb;
+};
+
+#define PCAN_USB_STATE_CONNECTED	0x00000001
+#define PCAN_USB_STATE_STARTED		0x00000002
+
+/* PEAK-System USB device */
+struct peak_usb_device {
+	struct can_priv can;
+	const struct peak_usb_adapter *adapter;
+	unsigned int ctrl_idx;
+	u32 state;
+
+	struct sk_buff *echo_skb[PCAN_USB_MAX_TX_URBS];
+
+	struct usb_device *udev;
+	struct net_device *netdev;
+
+	atomic_t active_tx_urbs;
+	struct usb_anchor tx_submitted;
+	struct peak_tx_urb_context tx_contexts[PCAN_USB_MAX_TX_URBS];
+
+	u8 *cmd_buf;
+	struct usb_anchor rx_submitted;
+
+	u32 device_number;
+	u8 device_rev;
+
+	u8 ep_msg_in;
+	u8 ep_msg_out;
+
+	u16 bus_load;
+
+	struct peak_usb_device *prev_siblings;
+	struct peak_usb_device *next_siblings;
+};
+
+void pcan_dump_mem(char *prompt, void *p, int l);
+
+/* common timestamp management */
+void peak_usb_init_time_ref(struct peak_time_ref *time_ref,
+			    const struct peak_usb_adapter *adapter);
+void peak_usb_update_ts_now(struct peak_time_ref *time_ref, u32 ts_now);
+void peak_usb_set_ts_now(struct peak_time_ref *time_ref, u32 ts_now);
+void peak_usb_get_ts_tv(struct peak_time_ref *time_ref, u32 ts,
+			struct timeval *tv);
+int peak_usb_netif_rx(struct sk_buff *skb,
+		      struct peak_time_ref *time_ref, u32 ts_low, u32 ts_high);
+void peak_usb_async_complete(struct urb *urb);
+void peak_usb_restart_complete(struct peak_usb_device *dev);
+
+#endif
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
new file mode 100644
index 000000000..09d14e70a
--- /dev/null
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -0,0 +1,1126 @@
+/*
+ * CAN driver for PEAK System PCAN-USB FD / PCAN-USB Pro FD adapter
+ *
+ * Copyright (C) 2013-2014 Stephane Grosjean <s.grosjean@peak-system.com>
+ *
+ * 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 of the License.
+ *
+ * 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.
+ */
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+#include <linux/module.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+#include "pcan_usb_core.h"
+#include "pcan_usb_pro.h"
+#include "pcan_ucan.h"
+
+MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB FD adapter");
+MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB Pro FD adapter");
+
+#define PCAN_USBPROFD_CHANNEL_COUNT	2
+#define PCAN_USBFD_CHANNEL_COUNT	1
+
+/* PCAN-USB Pro FD adapter internal clock (Hz) */
+#define PCAN_UFD_CRYSTAL_HZ		80000000
+
+#define PCAN_UFD_CMD_BUFFER_SIZE	512
+#define PCAN_UFD_LOSPD_PKT_SIZE		64
+
+/* PCAN-USB Pro FD command timeout (ms.) */
+#define PCAN_UFD_CMD_TIMEOUT_MS		1000
+
+/* PCAN-USB Pro FD rx/tx buffers size */
+#define PCAN_UFD_RX_BUFFER_SIZE		2048
+#define PCAN_UFD_TX_BUFFER_SIZE		512
+
+/* read some versions info from the hw devcie */
+struct __packed pcan_ufd_fw_info {
+	__le16	size_of;	/* sizeof this */
+	__le16	type;		/* type of this structure */
+	u8	hw_type;	/* Type of hardware (HW_TYPE_xxx) */
+	u8	bl_version[3];	/* Bootloader version */
+	u8	hw_version;	/* Hardware version (PCB) */
+	u8	fw_version[3];	/* Firmware version */
+	__le32	dev_id[2];	/* "device id" per CAN */
+	__le32	ser_no;		/* S/N */
+	__le32	flags;		/* special functions */
+};
+
+/* handle device specific info used by the netdevices */
+struct pcan_usb_fd_if {
+	struct peak_usb_device	*dev[PCAN_USB_MAX_CHANNEL];
+	struct pcan_ufd_fw_info	fw_info;
+	struct peak_time_ref	time_ref;
+	int			cm_ignore_count;
+	int			dev_opened_count;
+};
+
+/* device information */
+struct pcan_usb_fd_device {
+	struct peak_usb_device	dev;
+	struct can_berr_counter	bec;
+	struct pcan_usb_fd_if	*usb_if;
+	u8			*cmd_buffer_addr;
+};
+
+/* Extended USB commands (non uCAN commands) */
+
+/* Clock Modes command */
+#define PCAN_UFD_CMD_CLK_SET		0x80
+
+#define PCAN_UFD_CLK_80MHZ		0x0
+#define PCAN_UFD_CLK_60MHZ		0x1
+#define PCAN_UFD_CLK_40MHZ		0x2
+#define PCAN_UFD_CLK_30MHZ		0x3
+#define PCAN_UFD_CLK_24MHZ		0x4
+#define PCAN_UFD_CLK_20MHZ		0x5
+#define PCAN_UFD_CLK_DEF		PCAN_UFD_CLK_80MHZ
+
+struct __packed pcan_ufd_clock {
+	__le16	opcode_channel;
+
+	u8	mode;
+	u8	unused[5];
+};
+
+/* LED control command */
+#define PCAN_UFD_CMD_LED_SET		0x86
+
+#define PCAN_UFD_LED_DEV		0x00
+#define PCAN_UFD_LED_FAST		0x01
+#define PCAN_UFD_LED_SLOW		0x02
+#define PCAN_UFD_LED_ON			0x03
+#define PCAN_UFD_LED_OFF		0x04
+#define PCAN_UFD_LED_DEF		PCAN_UFD_LED_DEV
+
+struct __packed pcan_ufd_led {
+	__le16	opcode_channel;
+
+	u8	mode;
+	u8	unused[5];
+};
+
+/* Extended usage of uCAN commands CMD_xxx_xx_OPTION for PCAN-USB Pro FD */
+#define PCAN_UFD_FLTEXT_CALIBRATION	0x8000
+
+struct __packed pcan_ufd_options {
+	__le16	opcode_channel;
+
+	__le16	ucan_mask;
+	u16	unused;
+	__le16	usb_mask;
+};
+
+/* Extended usage of uCAN messages for PCAN-USB Pro FD */
+#define PCAN_UFD_MSG_CALIBRATION	0x100
+
+struct __packed pcan_ufd_ts_msg {
+	__le16	size;
+	__le16	type;
+	__le32	ts_low;
+	__le32	ts_high;
+	__le16	usb_frame_index;
+	u16	unused;
+};
+
+#define PCAN_UFD_MSG_OVERRUN		0x101
+
+#define PCAN_UFD_OVMSG_CHANNEL(o)	((o)->channel & 0xf)
+
+struct __packed pcan_ufd_ovr_msg {
+	__le16	size;
+	__le16	type;
+	__le32	ts_low;
+	__le32	ts_high;
+	u8	channel;
+	u8	unused[3];
+};
+
+static inline int pufd_omsg_get_channel(struct pcan_ufd_ovr_msg *om)
+{
+	return om->channel & 0xf;
+}
+
+/* Clock mode frequency values */
+static const u32 pcan_usb_fd_clk_freq[6] = {
+	[PCAN_UFD_CLK_80MHZ] = 80000000,
+	[PCAN_UFD_CLK_60MHZ] = 60000000,
+	[PCAN_UFD_CLK_40MHZ] = 40000000,
+	[PCAN_UFD_CLK_30MHZ] = 30000000,
+	[PCAN_UFD_CLK_24MHZ] = 24000000,
+	[PCAN_UFD_CLK_20MHZ] = 20000000
+};
+
+/* return a device USB interface */
+static inline
+struct pcan_usb_fd_if *pcan_usb_fd_dev_if(struct peak_usb_device *dev)
+{
+	struct pcan_usb_fd_device *pdev =
+			container_of(dev, struct pcan_usb_fd_device, dev);
+	return pdev->usb_if;
+}
+
+/* return a device USB commands buffer */
+static inline void *pcan_usb_fd_cmd_buffer(struct peak_usb_device *dev)
+{
+	struct pcan_usb_fd_device *pdev =
+			container_of(dev, struct pcan_usb_fd_device, dev);
+	return pdev->cmd_buffer_addr;
+}
+
+/* send PCAN-USB Pro FD commands synchronously */
+static int pcan_usb_fd_send_cmd(struct peak_usb_device *dev, void *cmd_tail)
+{
+	void *cmd_head = pcan_usb_fd_cmd_buffer(dev);
+	int err = 0;
+	u8 *packet_ptr;
+	int i, n = 1, packet_len;
+	ptrdiff_t cmd_len;
+
+	/* usb device unregistered? */
+	if (!(dev->state & PCAN_USB_STATE_CONNECTED))
+		return 0;
+
+	/* if a packet is not filled completely by commands, the command list
+	 * is terminated with an "end of collection" record.
+	 */
+	cmd_len = cmd_tail - cmd_head;
+	if (cmd_len <= (PCAN_UFD_CMD_BUFFER_SIZE - sizeof(u64))) {
+		memset(cmd_tail, 0xff, sizeof(u64));
+		cmd_len += sizeof(u64);
+	}
+
+	packet_ptr = cmd_head;
+
+	/* firmware is not able to re-assemble 512 bytes buffer in full-speed */
+	if ((dev->udev->speed != USB_SPEED_HIGH) &&
+	    (cmd_len > PCAN_UFD_LOSPD_PKT_SIZE)) {
+		packet_len = PCAN_UFD_LOSPD_PKT_SIZE;
+		n += cmd_len / packet_len;
+	} else {
+		packet_len = cmd_len;
+	}
+
+	for (i = 0; i < n; i++) {
+		err = usb_bulk_msg(dev->udev,
+				   usb_sndbulkpipe(dev->udev,
+						   PCAN_USBPRO_EP_CMDOUT),
+				   packet_ptr, packet_len,
+				   NULL, PCAN_UFD_CMD_TIMEOUT_MS);
+		if (err) {
+			netdev_err(dev->netdev,
+				   "sending command failure: %d\n", err);
+			break;
+		}
+
+		packet_ptr += packet_len;
+	}
+
+	return err;
+}
+
+/* build the commands list in the given buffer, to enter operational mode */
+static int pcan_usb_fd_build_restart_cmd(struct peak_usb_device *dev, u8 *buf)
+{
+	struct pucan_wr_err_cnt *prc;
+	struct pucan_command *cmd;
+	u8 *pc = buf;
+
+	/* 1st, reset error counters: */
+	prc = (struct pucan_wr_err_cnt *)pc;
+	prc->opcode_channel = pucan_cmd_opcode_channel(dev,
+						       PUCAN_CMD_WR_ERR_CNT);
+
+	/* select both counters */
+	prc->sel_mask = cpu_to_le16(PUCAN_WRERRCNT_TE|PUCAN_WRERRCNT_RE);
+
+	/* and reset their values */
+	prc->tx_counter = 0;
+	prc->rx_counter = 0;
+
+	/* moves the pointer forward */
+	pc += sizeof(struct pucan_wr_err_cnt);
+
+	/* add command to switch from ISO to non-ISO mode, if fw allows it */
+	if (dev->can.ctrlmode_supported & CAN_CTRLMODE_FD_NON_ISO) {
+		struct pucan_options *puo = (struct pucan_options *)pc;
+
+		puo->opcode_channel =
+			(dev->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO) ?
+			pucan_cmd_opcode_channel(dev,
+						 PUCAN_CMD_CLR_DIS_OPTION) :
+			pucan_cmd_opcode_channel(dev, PUCAN_CMD_SET_EN_OPTION);
+
+		puo->options = cpu_to_le16(PUCAN_OPTION_CANDFDISO);
+
+		/* to be sure that no other extended bits will be taken into
+		 * account
+		 */
+		puo->unused = 0;
+
+		/* moves the pointer forward */
+		pc += sizeof(struct pucan_options);
+	}
+
+	/* next, go back to operational mode */
+	cmd = (struct pucan_command *)pc;
+	cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
+				(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) ?
+						PUCAN_CMD_LISTEN_ONLY_MODE :
+						PUCAN_CMD_NORMAL_MODE);
+	pc += sizeof(struct pucan_command);
+
+	return pc - buf;
+}
+
+/* set CAN bus on/off */
+static int pcan_usb_fd_set_bus(struct peak_usb_device *dev, u8 onoff)
+{
+	u8 *pc = pcan_usb_fd_cmd_buffer(dev);
+	int l;
+
+	if (onoff) {
+		/* build the cmds list to enter operational mode */
+		l = pcan_usb_fd_build_restart_cmd(dev, pc);
+	} else {
+		struct pucan_command *cmd = (struct pucan_command *)pc;
+
+		/* build cmd to go back to reset mode */
+		cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
+							PUCAN_CMD_RESET_MODE);
+		l = sizeof(struct pucan_command);
+	}
+
+	/* send the command */
+	return pcan_usb_fd_send_cmd(dev, pc + l);
+}
+
+/* set filtering masks:
+ *
+ *	idx  in range [0..63] selects a row #idx, all rows otherwise
+ *	mask in range [0..0xffffffff] defines up to 32 CANIDs in the row(s)
+ *
+ *	Each bit of this 64 x 32 bits array defines a CANID value:
+ *
+ *	bit[i,j] = 1 implies that CANID=(i x 32)+j will be received, while
+ *	bit[i,j] = 0 implies that CANID=(i x 32)+j will be discarded.
+ */
+static int pcan_usb_fd_set_filter_std(struct peak_usb_device *dev, int idx,
+				      u32 mask)
+{
+	struct pucan_filter_std *cmd = pcan_usb_fd_cmd_buffer(dev);
+	int i, n;
+
+	/* select all rows when idx is out of range [0..63] */
+	if ((idx < 0) || (idx >= (1 << PUCAN_FLTSTD_ROW_IDX_BITS))) {
+		n = 1 << PUCAN_FLTSTD_ROW_IDX_BITS;
+		idx = 0;
+
+	/* select the row (and only the row) otherwise */
+	} else {
+		n = idx + 1;
+	}
+
+	for (i = idx; i < n; i++, cmd++) {
+		cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
+							PUCAN_CMD_FILTER_STD);
+		cmd->idx = cpu_to_le16(i);
+		cmd->mask = cpu_to_le32(mask);
+	}
+
+	/* send the command */
+	return pcan_usb_fd_send_cmd(dev, cmd);
+}
+
+/* set/unset options
+ *
+ *	onoff	set(1)/unset(0) options
+ *	mask	each bit defines a kind of options to set/unset
+ */
+static int pcan_usb_fd_set_options(struct peak_usb_device *dev,
+				   bool onoff, u16 ucan_mask, u16 usb_mask)
+{
+	struct pcan_ufd_options *cmd = pcan_usb_fd_cmd_buffer(dev);
+
+	cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
+					(onoff) ? PUCAN_CMD_SET_EN_OPTION :
+						  PUCAN_CMD_CLR_DIS_OPTION);
+
+	cmd->ucan_mask = cpu_to_le16(ucan_mask);
+	cmd->usb_mask = cpu_to_le16(usb_mask);
+
+	/* send the command */
+	return pcan_usb_fd_send_cmd(dev, ++cmd);
+}
+
+/* setup LED control */
+static int pcan_usb_fd_set_can_led(struct peak_usb_device *dev, u8 led_mode)
+{
+	struct pcan_ufd_led *cmd = pcan_usb_fd_cmd_buffer(dev);
+
+	cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
+						       PCAN_UFD_CMD_LED_SET);
+	cmd->mode = led_mode;
+
+	/* send the command */
+	return pcan_usb_fd_send_cmd(dev, ++cmd);
+}
+
+/* set CAN clock domain */
+static int pcan_usb_fd_set_clock_domain(struct peak_usb_device *dev,
+					u8 clk_mode)
+{
+	struct pcan_ufd_clock *cmd = pcan_usb_fd_cmd_buffer(dev);
+
+	cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
+						       PCAN_UFD_CMD_CLK_SET);
+	cmd->mode = clk_mode;
+
+	/* send the command */
+	return pcan_usb_fd_send_cmd(dev, ++cmd);
+}
+
+/* set bittiming for CAN and CAN-FD header */
+static int pcan_usb_fd_set_bittiming_slow(struct peak_usb_device *dev,
+					  struct can_bittiming *bt)
+{
+	struct pucan_timing_slow *cmd = pcan_usb_fd_cmd_buffer(dev);
+
+	cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
+						       PUCAN_CMD_TIMING_SLOW);
+	cmd->sjw_t = PUCAN_TSLOW_SJW_T(bt->sjw - 1,
+				dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES);
+
+	cmd->tseg2 = PUCAN_TSLOW_TSEG2(bt->phase_seg2 - 1);
+	cmd->tseg1 = PUCAN_TSLOW_TSEG1(bt->prop_seg + bt->phase_seg1 - 1);
+	cmd->brp = cpu_to_le16(PUCAN_TSLOW_BRP(bt->brp - 1));
+
+	cmd->ewl = 96;	/* default */
+
+	/* send the command */
+	return pcan_usb_fd_send_cmd(dev, ++cmd);
+}
+
+/* set CAN-FD bittiming for data */
+static int pcan_usb_fd_set_bittiming_fast(struct peak_usb_device *dev,
+					  struct can_bittiming *bt)
+{
+	struct pucan_timing_fast *cmd = pcan_usb_fd_cmd_buffer(dev);
+
+	cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
+						       PUCAN_CMD_TIMING_FAST);
+	cmd->sjw = PUCAN_TFAST_SJW(bt->sjw - 1);
+	cmd->tseg2 = PUCAN_TFAST_TSEG2(bt->phase_seg2 - 1);
+	cmd->tseg1 = PUCAN_TFAST_TSEG1(bt->prop_seg + bt->phase_seg1 - 1);
+	cmd->brp = cpu_to_le16(PUCAN_TFAST_BRP(bt->brp - 1));
+
+	/* send the command */
+	return pcan_usb_fd_send_cmd(dev, ++cmd);
+}
+
+/* handle restart but in asynchronously way
+ * (uses PCAN-USB Pro code to complete asynchronous request)
+ */
+static int pcan_usb_fd_restart_async(struct peak_usb_device *dev,
+				     struct urb *urb, u8 *buf)
+{
+	u8 *pc = buf;
+
+	/* build the entire cmds list in the provided buffer, to go back into
+	 * operational mode.
+	 */
+	pc += pcan_usb_fd_build_restart_cmd(dev, pc);
+
+	/* add EOC */
+	memset(pc, 0xff, sizeof(struct pucan_command));
+	pc += sizeof(struct pucan_command);
+
+	/* complete the URB */
+	usb_fill_bulk_urb(urb, dev->udev,
+			  usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
+			  buf, pc - buf,
+			  pcan_usb_pro_restart_complete, dev);
+
+	/* and submit it. */
+	return usb_submit_urb(urb, GFP_ATOMIC);
+}
+
+static int pcan_usb_fd_drv_loaded(struct peak_usb_device *dev, bool loaded)
+{
+	struct pcan_usb_fd_device *pdev =
+			container_of(dev, struct pcan_usb_fd_device, dev);
+
+	pdev->cmd_buffer_addr[0] = 0;
+	pdev->cmd_buffer_addr[1] = !!loaded;
+
+	return pcan_usb_pro_send_req(dev,
+				PCAN_USBPRO_REQ_FCT,
+				PCAN_USBPRO_FCT_DRVLD,
+				pdev->cmd_buffer_addr,
+				PCAN_USBPRO_FCT_DRVLD_REQ_LEN);
+}
+
+static int pcan_usb_fd_decode_canmsg(struct pcan_usb_fd_if *usb_if,
+				     struct pucan_msg *rx_msg)
+{
+	struct pucan_rx_msg *rm = (struct pucan_rx_msg *)rx_msg;
+	struct peak_usb_device *dev = usb_if->dev[pucan_msg_get_channel(rm)];
+	struct net_device *netdev = dev->netdev;
+	struct canfd_frame *cfd;
+	struct sk_buff *skb;
+	const u16 rx_msg_flags = le16_to_cpu(rm->flags);
+
+	if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN) {
+		/* CANFD frame case */
+		skb = alloc_canfd_skb(netdev, &cfd);
+		if (!skb)
+			return -ENOMEM;
+
+		if (rx_msg_flags & PUCAN_MSG_BITRATE_SWITCH)
+			cfd->flags |= CANFD_BRS;
+
+		if (rx_msg_flags & PUCAN_MSG_ERROR_STATE_IND)
+			cfd->flags |= CANFD_ESI;
+
+		cfd->len = can_dlc2len(get_canfd_dlc(pucan_msg_get_dlc(rm)));
+	} else {
+		/* CAN 2.0 frame case */
+		skb = alloc_can_skb(netdev, (struct can_frame **)&cfd);
+		if (!skb)
+			return -ENOMEM;
+
+		cfd->len = get_can_dlc(pucan_msg_get_dlc(rm));
+	}
+
+	cfd->can_id = le32_to_cpu(rm->can_id);
+
+	if (rx_msg_flags & PUCAN_MSG_EXT_ID)
+		cfd->can_id |= CAN_EFF_FLAG;
+
+	if (rx_msg_flags & PUCAN_MSG_RTR)
+		cfd->can_id |= CAN_RTR_FLAG;
+	else
+		memcpy(cfd->data, rm->d, cfd->len);
+
+	peak_usb_netif_rx(skb, &usb_if->time_ref,
+			  le32_to_cpu(rm->ts_low), le32_to_cpu(rm->ts_high));
+
+	netdev->stats.rx_packets++;
+	netdev->stats.rx_bytes += cfd->len;
+
+	return 0;
+}
+
+/* handle uCAN status message */
+static int pcan_usb_fd_decode_status(struct pcan_usb_fd_if *usb_if,
+				     struct pucan_msg *rx_msg)
+{
+	struct pucan_status_msg *sm = (struct pucan_status_msg *)rx_msg;
+	struct peak_usb_device *dev = usb_if->dev[pucan_stmsg_get_channel(sm)];
+	struct pcan_usb_fd_device *pdev =
+			container_of(dev, struct pcan_usb_fd_device, dev);
+	enum can_state new_state = CAN_STATE_ERROR_ACTIVE;
+	enum can_state rx_state, tx_state;
+	struct net_device *netdev = dev->netdev;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+
+	/* nothing should be sent while in BUS_OFF state */
+	if (dev->can.state == CAN_STATE_BUS_OFF)
+		return 0;
+
+	if (sm->channel_p_w_b & PUCAN_BUS_BUSOFF) {
+		new_state = CAN_STATE_BUS_OFF;
+	} else if (sm->channel_p_w_b & PUCAN_BUS_PASSIVE) {
+		new_state = CAN_STATE_ERROR_PASSIVE;
+	} else if (sm->channel_p_w_b & PUCAN_BUS_WARNING) {
+		new_state = CAN_STATE_ERROR_WARNING;
+	} else {
+		/* no error bit (so, no error skb, back to active state) */
+		dev->can.state = CAN_STATE_ERROR_ACTIVE;
+		pdev->bec.txerr = 0;
+		pdev->bec.rxerr = 0;
+		return 0;
+	}
+
+	/* state hasn't changed */
+	if (new_state == dev->can.state)
+		return 0;
+
+	/* handle bus state change */
+	tx_state = (pdev->bec.txerr >= pdev->bec.rxerr) ? new_state : 0;
+	rx_state = (pdev->bec.txerr <= pdev->bec.rxerr) ? new_state : 0;
+
+	/* allocate an skb to store the error frame */
+	skb = alloc_can_err_skb(netdev, &cf);
+	if (skb)
+		can_change_state(netdev, cf, tx_state, rx_state);
+
+	/* things must be done even in case of OOM */
+	if (new_state == CAN_STATE_BUS_OFF)
+		can_bus_off(netdev);
+
+	if (!skb)
+		return -ENOMEM;
+
+	peak_usb_netif_rx(skb, &usb_if->time_ref,
+			  le32_to_cpu(sm->ts_low), le32_to_cpu(sm->ts_high));
+
+	netdev->stats.rx_packets++;
+	netdev->stats.rx_bytes += cf->can_dlc;
+
+	return 0;
+}
+
+/* handle uCAN error message */
+static int pcan_usb_fd_decode_error(struct pcan_usb_fd_if *usb_if,
+				    struct pucan_msg *rx_msg)
+{
+	struct pucan_error_msg *er = (struct pucan_error_msg *)rx_msg;
+	struct peak_usb_device *dev = usb_if->dev[pucan_ermsg_get_channel(er)];
+	struct pcan_usb_fd_device *pdev =
+			container_of(dev, struct pcan_usb_fd_device, dev);
+
+	/* keep a trace of tx and rx error counters for later use */
+	pdev->bec.txerr = er->tx_err_cnt;
+	pdev->bec.rxerr = er->rx_err_cnt;
+
+	return 0;
+}
+
+/* handle uCAN overrun message */
+static int pcan_usb_fd_decode_overrun(struct pcan_usb_fd_if *usb_if,
+				      struct pucan_msg *rx_msg)
+{
+	struct pcan_ufd_ovr_msg *ov = (struct pcan_ufd_ovr_msg *)rx_msg;
+	struct peak_usb_device *dev = usb_if->dev[pufd_omsg_get_channel(ov)];
+	struct net_device *netdev = dev->netdev;
+	struct can_frame *cf;
+	struct sk_buff *skb;
+
+	/* allocate an skb to store the error frame */
+	skb = alloc_can_err_skb(netdev, &cf);
+	if (!skb)
+		return -ENOMEM;
+
+	cf->can_id |= CAN_ERR_CRTL;
+	cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
+
+	peak_usb_netif_rx(skb, &usb_if->time_ref,
+			  le32_to_cpu(ov->ts_low), le32_to_cpu(ov->ts_high));
+
+	netdev->stats.rx_over_errors++;
+	netdev->stats.rx_errors++;
+
+	return 0;
+}
+
+/* handle USB calibration message */
+static void pcan_usb_fd_decode_ts(struct pcan_usb_fd_if *usb_if,
+				  struct pucan_msg *rx_msg)
+{
+	struct pcan_ufd_ts_msg *ts = (struct pcan_ufd_ts_msg *)rx_msg;
+
+	/* should wait until clock is stabilized */
+	if (usb_if->cm_ignore_count > 0)
+		usb_if->cm_ignore_count--;
+	else
+		peak_usb_set_ts_now(&usb_if->time_ref, le32_to_cpu(ts->ts_low));
+}
+
+/* callback for bulk IN urb */
+static int pcan_usb_fd_decode_buf(struct peak_usb_device *dev, struct urb *urb)
+{
+	struct pcan_usb_fd_if *usb_if = pcan_usb_fd_dev_if(dev);
+	struct net_device *netdev = dev->netdev;
+	struct pucan_msg *rx_msg;
+	u8 *msg_ptr, *msg_end;
+	int err = 0;
+
+	/* loop reading all the records from the incoming message */
+	msg_ptr = urb->transfer_buffer;
+	msg_end = urb->transfer_buffer + urb->actual_length;
+	for (; msg_ptr < msg_end;) {
+		u16 rx_msg_type, rx_msg_size;
+
+		rx_msg = (struct pucan_msg *)msg_ptr;
+		if (!rx_msg->size) {
+			/* null packet found: end of list */
+			break;
+		}
+
+		rx_msg_size = le16_to_cpu(rx_msg->size);
+		rx_msg_type = le16_to_cpu(rx_msg->type);
+
+		/* check if the record goes out of current packet */
+		if (msg_ptr + rx_msg_size > msg_end) {
+			netdev_err(netdev,
+				   "got frag rec: should inc usb rx buf sze\n");
+			err = -EBADMSG;
+			break;
+		}
+
+		switch (rx_msg_type) {
+		case PUCAN_MSG_CAN_RX:
+			err = pcan_usb_fd_decode_canmsg(usb_if, rx_msg);
+			if (err < 0)
+				goto fail;
+			break;
+
+		case PCAN_UFD_MSG_CALIBRATION:
+			pcan_usb_fd_decode_ts(usb_if, rx_msg);
+			break;
+
+		case PUCAN_MSG_ERROR:
+			err = pcan_usb_fd_decode_error(usb_if, rx_msg);
+			if (err < 0)
+				goto fail;
+			break;
+
+		case PUCAN_MSG_STATUS:
+			err = pcan_usb_fd_decode_status(usb_if, rx_msg);
+			if (err < 0)
+				goto fail;
+			break;
+
+		case PCAN_UFD_MSG_OVERRUN:
+			err = pcan_usb_fd_decode_overrun(usb_if, rx_msg);
+			if (err < 0)
+				goto fail;
+			break;
+
+		default:
+			netdev_err(netdev,
+				   "unhandled msg type 0x%02x (%d): ignored\n",
+				   rx_msg_type, rx_msg_type);
+			break;
+		}
+
+		msg_ptr += rx_msg_size;
+	}
+
+fail:
+	if (err)
+		pcan_dump_mem("received msg",
+			      urb->transfer_buffer, urb->actual_length);
+	return err;
+}
+
+/* CAN/CANFD frames encoding callback */
+static int pcan_usb_fd_encode_msg(struct peak_usb_device *dev,
+				  struct sk_buff *skb, u8 *obuf, size_t *size)
+{
+	struct pucan_tx_msg *tx_msg = (struct pucan_tx_msg *)obuf;
+	struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
+	u16 tx_msg_size, tx_msg_flags;
+	u8 can_dlc;
+
+	tx_msg_size = ALIGN(sizeof(struct pucan_tx_msg) + cfd->len, 4);
+	tx_msg->size = cpu_to_le16(tx_msg_size);
+	tx_msg->type = cpu_to_le16(PUCAN_MSG_CAN_TX);
+
+	tx_msg_flags = 0;
+	if (cfd->can_id & CAN_EFF_FLAG) {
+		tx_msg_flags |= PUCAN_MSG_EXT_ID;
+		tx_msg->can_id = cpu_to_le32(cfd->can_id & CAN_EFF_MASK);
+	} else {
+		tx_msg->can_id = cpu_to_le32(cfd->can_id & CAN_SFF_MASK);
+	}
+
+	if (can_is_canfd_skb(skb)) {
+		/* considering a CANFD frame */
+		can_dlc = can_len2dlc(cfd->len);
+
+		tx_msg_flags |= PUCAN_MSG_EXT_DATA_LEN;
+
+		if (cfd->flags & CANFD_BRS)
+			tx_msg_flags |= PUCAN_MSG_BITRATE_SWITCH;
+
+		if (cfd->flags & CANFD_ESI)
+			tx_msg_flags |= PUCAN_MSG_ERROR_STATE_IND;
+	} else {
+		/* CAND 2.0 frames */
+		can_dlc = cfd->len;
+
+		if (cfd->can_id & CAN_RTR_FLAG)
+			tx_msg_flags |= PUCAN_MSG_RTR;
+	}
+
+	tx_msg->flags = cpu_to_le16(tx_msg_flags);
+	tx_msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(dev->ctrl_idx, can_dlc);
+	memcpy(tx_msg->d, cfd->data, cfd->len);
+
+	/* add null size message to tag the end (messages are 32-bits aligned)
+	 */
+	tx_msg = (struct pucan_tx_msg *)(obuf + tx_msg_size);
+
+	tx_msg->size = 0;
+
+	/* set the whole size of the USB packet to send */
+	*size = tx_msg_size + sizeof(u32);
+
+	return 0;
+}
+
+/* start the interface (last chance before set bus on) */
+static int pcan_usb_fd_start(struct peak_usb_device *dev)
+{
+	struct pcan_usb_fd_device *pdev =
+			container_of(dev, struct pcan_usb_fd_device, dev);
+	int err;
+
+	/* set filter mode: all acceptance */
+	err = pcan_usb_fd_set_filter_std(dev, -1, 0xffffffff);
+	if (err)
+		return err;
+
+	/* opening first device: */
+	if (pdev->usb_if->dev_opened_count == 0) {
+		/* reset time_ref */
+		peak_usb_init_time_ref(&pdev->usb_if->time_ref,
+				       &pcan_usb_pro_fd);
+
+		/* enable USB calibration messages */
+		err = pcan_usb_fd_set_options(dev, 1,
+					      PUCAN_OPTION_ERROR,
+					      PCAN_UFD_FLTEXT_CALIBRATION);
+	}
+
+	pdev->usb_if->dev_opened_count++;
+
+	/* reset cached error counters */
+	pdev->bec.txerr = 0;
+	pdev->bec.rxerr = 0;
+
+	return err;
+}
+
+/* socket callback used to copy berr counters values receieved through USB */
+static int pcan_usb_fd_get_berr_counter(const struct net_device *netdev,
+					struct can_berr_counter *bec)
+{
+	struct peak_usb_device *dev = netdev_priv(netdev);
+	struct pcan_usb_fd_device *pdev =
+			container_of(dev, struct pcan_usb_fd_device, dev);
+
+	*bec = pdev->bec;
+
+	/* must return 0 */
+	return 0;
+}
+
+/* stop interface (last chance before set bus off) */
+static int pcan_usb_fd_stop(struct peak_usb_device *dev)
+{
+	struct pcan_usb_fd_device *pdev =
+			container_of(dev, struct pcan_usb_fd_device, dev);
+
+	/* turn off special msgs for that interface if no other dev opened */
+	if (pdev->usb_if->dev_opened_count == 1)
+		pcan_usb_fd_set_options(dev, 0,
+					PUCAN_OPTION_ERROR,
+					PCAN_UFD_FLTEXT_CALIBRATION);
+	pdev->usb_if->dev_opened_count--;
+
+	return 0;
+}
+
+/* called when probing, to initialize a device object */
+static int pcan_usb_fd_init(struct peak_usb_device *dev)
+{
+	struct pcan_usb_fd_device *pdev =
+			container_of(dev, struct pcan_usb_fd_device, dev);
+	int i, err = -ENOMEM;
+
+	/* do this for 1st channel only */
+	if (!dev->prev_siblings) {
+		/* allocate netdevices common structure attached to first one */
+		pdev->usb_if = kzalloc(sizeof(*pdev->usb_if), GFP_KERNEL);
+		if (!pdev->usb_if)
+			goto err_out;
+
+		/* allocate command buffer once for all for the interface */
+		pdev->cmd_buffer_addr = kmalloc(PCAN_UFD_CMD_BUFFER_SIZE,
+						GFP_KERNEL);
+		if (!pdev->cmd_buffer_addr)
+			goto err_out_1;
+
+		/* number of ts msgs to ignore before taking one into account */
+		pdev->usb_if->cm_ignore_count = 5;
+
+		err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
+					    PCAN_USBPRO_INFO_FW,
+					    &pdev->usb_if->fw_info,
+					    sizeof(pdev->usb_if->fw_info));
+		if (err) {
+			dev_err(dev->netdev->dev.parent,
+				"unable to read %s firmware info (err %d)\n",
+				dev->adapter->name, err);
+			goto err_out_2;
+		}
+
+		/* explicit use of dev_xxx() instead of netdev_xxx() here:
+		 * information displayed are related to the device itself, not
+		 * to the canx (channel) device.
+		 */
+		dev_info(dev->netdev->dev.parent,
+			 "PEAK-System %s v%u fw v%u.%u.%u (%u channels)\n",
+			 dev->adapter->name, pdev->usb_if->fw_info.hw_version,
+			 pdev->usb_if->fw_info.fw_version[0],
+			 pdev->usb_if->fw_info.fw_version[1],
+			 pdev->usb_if->fw_info.fw_version[2],
+			 dev->adapter->ctrl_count);
+
+		/* check for ability to switch between ISO/non-ISO modes */
+		if (pdev->usb_if->fw_info.fw_version[0] >= 2) {
+			/* firmware >= 2.x supports ISO/non-ISO switching */
+			dev->can.ctrlmode_supported |= CAN_CTRLMODE_FD_NON_ISO;
+		} else {
+			/* firmware < 2.x only supports fixed(!) non-ISO */
+			dev->can.ctrlmode |= CAN_CTRLMODE_FD_NON_ISO;
+		}
+
+		/* tell the hardware the can driver is running */
+		err = pcan_usb_fd_drv_loaded(dev, 1);
+		if (err) {
+			dev_err(dev->netdev->dev.parent,
+				"unable to tell %s driver is loaded (err %d)\n",
+				dev->adapter->name, err);
+			goto err_out_2;
+		}
+	} else {
+		/* otherwise, simply copy previous sibling's values */
+		struct pcan_usb_fd_device *ppdev =
+			container_of(dev->prev_siblings,
+				     struct pcan_usb_fd_device, dev);
+
+		pdev->usb_if = ppdev->usb_if;
+		pdev->cmd_buffer_addr = ppdev->cmd_buffer_addr;
+
+		/* do a copy of the ctrlmode[_supported] too */
+		dev->can.ctrlmode = ppdev->dev.can.ctrlmode;
+		dev->can.ctrlmode_supported = ppdev->dev.can.ctrlmode_supported;
+	}
+
+	pdev->usb_if->dev[dev->ctrl_idx] = dev;
+	dev->device_number =
+		le32_to_cpu(pdev->usb_if->fw_info.dev_id[dev->ctrl_idx]);
+
+	/* set clock domain */
+	for (i = 0; i < ARRAY_SIZE(pcan_usb_fd_clk_freq); i++)
+		if (dev->adapter->clock.freq == pcan_usb_fd_clk_freq[i])
+			break;
+
+	if (i >= ARRAY_SIZE(pcan_usb_fd_clk_freq)) {
+		dev_warn(dev->netdev->dev.parent,
+			 "incompatible clock frequencies\n");
+		err = -EINVAL;
+		goto err_out_2;
+	}
+
+	pcan_usb_fd_set_clock_domain(dev, i);
+
+	/* set LED in default state (end of init phase) */
+	pcan_usb_fd_set_can_led(dev, PCAN_UFD_LED_DEF);
+
+	return 0;
+
+err_out_2:
+	kfree(pdev->cmd_buffer_addr);
+err_out_1:
+	kfree(pdev->usb_if);
+err_out:
+	return err;
+}
+
+/* called when driver module is being unloaded */
+static void pcan_usb_fd_exit(struct peak_usb_device *dev)
+{
+	struct pcan_usb_fd_device *pdev =
+			container_of(dev, struct pcan_usb_fd_device, dev);
+
+	/* when rmmod called before unplug and if down, should reset things
+	 * before leaving
+	 */
+	if (dev->can.state != CAN_STATE_STOPPED) {
+		/* set bus off on the corresponding channel */
+		pcan_usb_fd_set_bus(dev, 0);
+	}
+
+	/* switch off corresponding CAN LEDs */
+	pcan_usb_fd_set_can_led(dev, PCAN_UFD_LED_OFF);
+
+	/* if channel #0 (only) */
+	if (dev->ctrl_idx == 0) {
+		/* turn off calibration message if any device were opened */
+		if (pdev->usb_if->dev_opened_count > 0)
+			pcan_usb_fd_set_options(dev, 0,
+						PUCAN_OPTION_ERROR,
+						PCAN_UFD_FLTEXT_CALIBRATION);
+
+		/* tell USB adapter that the driver is being unloaded */
+		pcan_usb_fd_drv_loaded(dev, 0);
+	}
+}
+
+/* called when the USB adapter is unplugged */
+static void pcan_usb_fd_free(struct peak_usb_device *dev)
+{
+	/* last device: can free shared objects now */
+	if (!dev->prev_siblings && !dev->next_siblings) {
+		struct pcan_usb_fd_device *pdev =
+			container_of(dev, struct pcan_usb_fd_device, dev);
+
+		/* free commands buffer */
+		kfree(pdev->cmd_buffer_addr);
+
+		/* free usb interface object */
+		kfree(pdev->usb_if);
+	}
+}
+
+/* describes the PCAN-USB FD adapter */
+const struct peak_usb_adapter pcan_usb_fd = {
+	.name = "PCAN-USB FD",
+	.device_id = PCAN_USBFD_PRODUCT_ID,
+	.ctrl_count = PCAN_USBFD_CHANNEL_COUNT,
+	.ctrlmode_supported = CAN_CTRLMODE_FD |
+			CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
+	.clock = {
+		.freq = PCAN_UFD_CRYSTAL_HZ,
+	},
+	.bittiming_const = {
+		.name = "pcan_usb_fd",
+		.tseg1_min = 1,
+		.tseg1_max = 64,
+		.tseg2_min = 1,
+		.tseg2_max = 16,
+		.sjw_max = 16,
+		.brp_min = 1,
+		.brp_max = 1024,
+		.brp_inc = 1,
+	},
+	.data_bittiming_const = {
+		.name = "pcan_usb_fd",
+		.tseg1_min = 1,
+		.tseg1_max = 16,
+		.tseg2_min = 1,
+		.tseg2_max = 8,
+		.sjw_max = 4,
+		.brp_min = 1,
+		.brp_max = 1024,
+		.brp_inc = 1,
+	},
+
+	/* size of device private data */
+	.sizeof_dev_private = sizeof(struct pcan_usb_fd_device),
+
+	/* timestamps usage */
+	.ts_used_bits = 32,
+	.ts_period = 1000000, /* calibration period in ts. */
+	.us_per_ts_scale = 1, /* us = (ts * scale) >> shift */
+	.us_per_ts_shift = 0,
+
+	/* give here messages in/out endpoints */
+	.ep_msg_in = PCAN_USBPRO_EP_MSGIN,
+	.ep_msg_out = {PCAN_USBPRO_EP_MSGOUT_0},
+
+	/* size of rx/tx usb buffers */
+	.rx_buffer_size = PCAN_UFD_RX_BUFFER_SIZE,
+	.tx_buffer_size = PCAN_UFD_TX_BUFFER_SIZE,
+
+	/* device callbacks */
+	.intf_probe = pcan_usb_pro_probe,	/* same as PCAN-USB Pro */
+	.dev_init = pcan_usb_fd_init,
+
+	.dev_exit = pcan_usb_fd_exit,
+	.dev_free = pcan_usb_fd_free,
+	.dev_set_bus = pcan_usb_fd_set_bus,
+	.dev_set_bittiming = pcan_usb_fd_set_bittiming_slow,
+	.dev_set_data_bittiming = pcan_usb_fd_set_bittiming_fast,
+	.dev_decode_buf = pcan_usb_fd_decode_buf,
+	.dev_start = pcan_usb_fd_start,
+	.dev_stop = pcan_usb_fd_stop,
+	.dev_restart_async = pcan_usb_fd_restart_async,
+	.dev_encode_msg = pcan_usb_fd_encode_msg,
+
+	.do_get_berr_counter = pcan_usb_fd_get_berr_counter,
+};
+
+/* describes the PCAN-USB Pro FD adapter */
+const struct peak_usb_adapter pcan_usb_pro_fd = {
+	.name = "PCAN-USB Pro FD",
+	.device_id = PCAN_USBPROFD_PRODUCT_ID,
+	.ctrl_count = PCAN_USBPROFD_CHANNEL_COUNT,
+	.ctrlmode_supported = CAN_CTRLMODE_FD |
+			CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
+	.clock = {
+		.freq = PCAN_UFD_CRYSTAL_HZ,
+	},
+	.bittiming_const = {
+		.name = "pcan_usb_pro_fd",
+		.tseg1_min = 1,
+		.tseg1_max = 64,
+		.tseg2_min = 1,
+		.tseg2_max = 16,
+		.sjw_max = 16,
+		.brp_min = 1,
+		.brp_max = 1024,
+		.brp_inc = 1,
+	},
+	.data_bittiming_const = {
+		.name = "pcan_usb_pro_fd",
+		.tseg1_min = 1,
+		.tseg1_max = 16,
+		.tseg2_min = 1,
+		.tseg2_max = 8,
+		.sjw_max = 4,
+		.brp_min = 1,
+		.brp_max = 1024,
+		.brp_inc = 1,
+	},
+
+	/* size of device private data */
+	.sizeof_dev_private = sizeof(struct pcan_usb_fd_device),
+
+	/* timestamps usage */
+	.ts_used_bits = 32,
+	.ts_period = 1000000, /* calibration period in ts. */
+	.us_per_ts_scale = 1, /* us = (ts * scale) >> shift */
+	.us_per_ts_shift = 0,
+
+	/* give here messages in/out endpoints */
+	.ep_msg_in = PCAN_USBPRO_EP_MSGIN,
+	.ep_msg_out = {PCAN_USBPRO_EP_MSGOUT_0, PCAN_USBPRO_EP_MSGOUT_1},
+
+	/* size of rx/tx usb buffers */
+	.rx_buffer_size = PCAN_UFD_RX_BUFFER_SIZE,
+	.tx_buffer_size = PCAN_UFD_TX_BUFFER_SIZE,
+
+	/* device callbacks */
+	.intf_probe = pcan_usb_pro_probe,	/* same as PCAN-USB Pro */
+	.dev_init = pcan_usb_fd_init,
+
+	.dev_exit = pcan_usb_fd_exit,
+	.dev_free = pcan_usb_fd_free,
+	.dev_set_bus = pcan_usb_fd_set_bus,
+	.dev_set_bittiming = pcan_usb_fd_set_bittiming_slow,
+	.dev_set_data_bittiming = pcan_usb_fd_set_bittiming_fast,
+	.dev_decode_buf = pcan_usb_fd_decode_buf,
+	.dev_start = pcan_usb_fd_start,
+	.dev_stop = pcan_usb_fd_stop,
+	.dev_restart_async = pcan_usb_fd_restart_async,
+	.dev_encode_msg = pcan_usb_fd_encode_msg,
+
+	.do_get_berr_counter = pcan_usb_fd_get_berr_counter,
+};
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
new file mode 100644
index 000000000..dec517176
--- /dev/null
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -0,0 +1,1057 @@
+/*
+ * CAN driver for PEAK System PCAN-USB Pro adapter
+ * Derived from the PCAN project file driver/src/pcan_usbpro.c
+ *
+ * Copyright (C) 2003-2011 PEAK System-Technik GmbH
+ * Copyright (C) 2011-2012 Stephane Grosjean <s.grosjean@peak-system.com>
+ *
+ * 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 of the License.
+ *
+ * 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.
+ */
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+#include <linux/module.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+#include "pcan_usb_core.h"
+#include "pcan_usb_pro.h"
+
+MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB Pro adapter");
+
+#define PCAN_USBPRO_CHANNEL_COUNT	2
+
+/* PCAN-USB Pro adapter internal clock (MHz) */
+#define PCAN_USBPRO_CRYSTAL_HZ		56000000
+
+/* PCAN-USB Pro command timeout (ms.) */
+#define PCAN_USBPRO_COMMAND_TIMEOUT	1000
+
+/* PCAN-USB Pro rx/tx buffers size */
+#define PCAN_USBPRO_RX_BUFFER_SIZE	1024
+#define PCAN_USBPRO_TX_BUFFER_SIZE	64
+
+#define PCAN_USBPRO_MSG_HEADER_LEN	4
+
+/* some commands responses need to be re-submitted */
+#define PCAN_USBPRO_RSP_SUBMIT_MAX	2
+
+#define PCAN_USBPRO_RTR			0x01
+#define PCAN_USBPRO_EXT			0x02
+
+#define PCAN_USBPRO_CMD_BUFFER_SIZE	512
+
+/* handle device specific info used by the netdevices */
+struct pcan_usb_pro_interface {
+	struct peak_usb_device *dev[PCAN_USBPRO_CHANNEL_COUNT];
+	struct peak_time_ref time_ref;
+	int cm_ignore_count;
+	int dev_opened_count;
+};
+
+/* device information */
+struct pcan_usb_pro_device {
+	struct peak_usb_device dev;
+	struct pcan_usb_pro_interface *usb_if;
+	u32 cached_ccbt;
+};
+
+/* internal structure used to handle messages sent to bulk urb */
+struct pcan_usb_pro_msg {
+	u8 *rec_ptr;
+	int rec_buffer_size;
+	int rec_buffer_len;
+	union {
+		__le16 *rec_cnt_rd;
+		__le32 *rec_cnt;
+		u8 *rec_buffer;
+	} u;
+};
+
+/* records sizes table indexed on message id. (8-bits value) */
+static u16 pcan_usb_pro_sizeof_rec[256] = {
+	[PCAN_USBPRO_SETBTR] = sizeof(struct pcan_usb_pro_btr),
+	[PCAN_USBPRO_SETBUSACT] = sizeof(struct pcan_usb_pro_busact),
+	[PCAN_USBPRO_SETSILENT] = sizeof(struct pcan_usb_pro_silent),
+	[PCAN_USBPRO_SETFILTR] = sizeof(struct pcan_usb_pro_filter),
+	[PCAN_USBPRO_SETTS] = sizeof(struct pcan_usb_pro_setts),
+	[PCAN_USBPRO_GETDEVID] = sizeof(struct pcan_usb_pro_devid),
+	[PCAN_USBPRO_SETLED] = sizeof(struct pcan_usb_pro_setled),
+	[PCAN_USBPRO_RXMSG8] = sizeof(struct pcan_usb_pro_rxmsg),
+	[PCAN_USBPRO_RXMSG4] = sizeof(struct pcan_usb_pro_rxmsg) - 4,
+	[PCAN_USBPRO_RXMSG0] = sizeof(struct pcan_usb_pro_rxmsg) - 8,
+	[PCAN_USBPRO_RXRTR] = sizeof(struct pcan_usb_pro_rxmsg) - 8,
+	[PCAN_USBPRO_RXSTATUS] = sizeof(struct pcan_usb_pro_rxstatus),
+	[PCAN_USBPRO_RXTS] = sizeof(struct pcan_usb_pro_rxts),
+	[PCAN_USBPRO_TXMSG8] = sizeof(struct pcan_usb_pro_txmsg),
+	[PCAN_USBPRO_TXMSG4] = sizeof(struct pcan_usb_pro_txmsg) - 4,
+	[PCAN_USBPRO_TXMSG0] = sizeof(struct pcan_usb_pro_txmsg) - 8,
+};
+
+/*
+ * initialize PCAN-USB Pro message data structure
+ */
+static u8 *pcan_msg_init(struct pcan_usb_pro_msg *pm, void *buffer_addr,
+			 int buffer_size)
+{
+	if (buffer_size < PCAN_USBPRO_MSG_HEADER_LEN)
+		return NULL;
+
+	pm->u.rec_buffer = (u8 *)buffer_addr;
+	pm->rec_buffer_size = pm->rec_buffer_len = buffer_size;
+	pm->rec_ptr = pm->u.rec_buffer + PCAN_USBPRO_MSG_HEADER_LEN;
+
+	return pm->rec_ptr;
+}
+
+static u8 *pcan_msg_init_empty(struct pcan_usb_pro_msg *pm,
+			       void *buffer_addr, int buffer_size)
+{
+	u8 *pr = pcan_msg_init(pm, buffer_addr, buffer_size);
+
+	if (pr) {
+		pm->rec_buffer_len = PCAN_USBPRO_MSG_HEADER_LEN;
+		*pm->u.rec_cnt = 0;
+	}
+	return pr;
+}
+
+/*
+ * add one record to a message being built
+ */
+static int pcan_msg_add_rec(struct pcan_usb_pro_msg *pm, u8 id, ...)
+{
+	int len, i;
+	u8 *pc;
+	va_list ap;
+
+	va_start(ap, id);
+
+	pc = pm->rec_ptr + 1;
+
+	i = 0;
+	switch (id) {
+	case PCAN_USBPRO_TXMSG8:
+		i += 4;
+	case PCAN_USBPRO_TXMSG4:
+		i += 4;
+	case PCAN_USBPRO_TXMSG0:
+		*pc++ = va_arg(ap, int);
+		*pc++ = va_arg(ap, int);
+		*pc++ = va_arg(ap, int);
+		*(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
+		pc += 4;
+		memcpy(pc, va_arg(ap, int *), i);
+		pc += i;
+		break;
+
+	case PCAN_USBPRO_SETBTR:
+	case PCAN_USBPRO_GETDEVID:
+		*pc++ = va_arg(ap, int);
+		pc += 2;
+		*(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
+		pc += 4;
+		break;
+
+	case PCAN_USBPRO_SETFILTR:
+	case PCAN_USBPRO_SETBUSACT:
+	case PCAN_USBPRO_SETSILENT:
+		*pc++ = va_arg(ap, int);
+		*(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
+		pc += 2;
+		break;
+
+	case PCAN_USBPRO_SETLED:
+		*pc++ = va_arg(ap, int);
+		*(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
+		pc += 2;
+		*(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
+		pc += 4;
+		break;
+
+	case PCAN_USBPRO_SETTS:
+		pc++;
+		*(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
+		pc += 2;
+		break;
+
+	default:
+		pr_err("%s: %s(): unknown data type %02Xh (%d)\n",
+			PCAN_USB_DRIVER_NAME, __func__, id, id);
+		pc--;
+		break;
+	}
+
+	len = pc - pm->rec_ptr;
+	if (len > 0) {
+		*pm->u.rec_cnt = cpu_to_le32(le32_to_cpu(*pm->u.rec_cnt) + 1);
+		*pm->rec_ptr = id;
+
+		pm->rec_ptr = pc;
+		pm->rec_buffer_len += len;
+	}
+
+	va_end(ap);
+
+	return len;
+}
+
+/*
+ * send PCAN-USB Pro command synchronously
+ */
+static int pcan_usb_pro_send_cmd(struct peak_usb_device *dev,
+				 struct pcan_usb_pro_msg *pum)
+{
+	int actual_length;
+	int err;
+
+	/* usb device unregistered? */
+	if (!(dev->state & PCAN_USB_STATE_CONNECTED))
+		return 0;
+
+	err = usb_bulk_msg(dev->udev,
+		usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
+		pum->u.rec_buffer, pum->rec_buffer_len,
+		&actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
+	if (err)
+		netdev_err(dev->netdev, "sending command failure: %d\n", err);
+
+	return err;
+}
+
+/*
+ * wait for PCAN-USB Pro command response
+ */
+static int pcan_usb_pro_wait_rsp(struct peak_usb_device *dev,
+				 struct pcan_usb_pro_msg *pum)
+{
+	u8 req_data_type, req_channel;
+	int actual_length;
+	int i, err = 0;
+
+	/* usb device unregistered? */
+	if (!(dev->state & PCAN_USB_STATE_CONNECTED))
+		return 0;
+
+	req_data_type = pum->u.rec_buffer[4];
+	req_channel = pum->u.rec_buffer[5];
+
+	*pum->u.rec_cnt = 0;
+	for (i = 0; !err && i < PCAN_USBPRO_RSP_SUBMIT_MAX; i++) {
+		struct pcan_usb_pro_msg rsp;
+		union pcan_usb_pro_rec *pr;
+		u32 r, rec_cnt;
+		u16 rec_len;
+		u8 *pc;
+
+		err = usb_bulk_msg(dev->udev,
+			usb_rcvbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDIN),
+			pum->u.rec_buffer, pum->rec_buffer_len,
+			&actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
+		if (err) {
+			netdev_err(dev->netdev, "waiting rsp error %d\n", err);
+			break;
+		}
+
+		if (actual_length == 0)
+			continue;
+
+		err = -EBADMSG;
+		if (actual_length < PCAN_USBPRO_MSG_HEADER_LEN) {
+			netdev_err(dev->netdev,
+				   "got abnormal too small rsp (len=%d)\n",
+				   actual_length);
+			break;
+		}
+
+		pc = pcan_msg_init(&rsp, pum->u.rec_buffer,
+			actual_length);
+
+		rec_cnt = le32_to_cpu(*rsp.u.rec_cnt);
+
+		/* loop on records stored into message */
+		for (r = 0; r < rec_cnt; r++) {
+			pr = (union pcan_usb_pro_rec *)pc;
+			rec_len = pcan_usb_pro_sizeof_rec[pr->data_type];
+			if (!rec_len) {
+				netdev_err(dev->netdev,
+					   "got unprocessed record in msg\n");
+				pcan_dump_mem("rcvd rsp msg", pum->u.rec_buffer,
+					      actual_length);
+				break;
+			}
+
+			/* check if response corresponds to request */
+			if (pr->data_type != req_data_type)
+				netdev_err(dev->netdev,
+					   "got unwanted rsp %xh: ignored\n",
+					   pr->data_type);
+
+			/* check if channel in response corresponds too */
+			else if ((req_channel != 0xff) && \
+				(pr->bus_act.channel != req_channel))
+				netdev_err(dev->netdev,
+					"got rsp %xh but on chan%u: ignored\n",
+					req_data_type, pr->bus_act.channel);
+
+			/* got the response */
+			else
+				return 0;
+
+			/* otherwise, go on with next record in message */
+			pc += rec_len;
+		}
+	}
+
+	return (i >= PCAN_USBPRO_RSP_SUBMIT_MAX) ? -ERANGE : err;
+}
+
+int pcan_usb_pro_send_req(struct peak_usb_device *dev, int req_id,
+			  int req_value, void *req_addr, int req_size)
+{
+	int err;
+	u8 req_type;
+	unsigned int p;
+
+	/* usb device unregistered? */
+	if (!(dev->state & PCAN_USB_STATE_CONNECTED))
+		return 0;
+
+	req_type = USB_TYPE_VENDOR | USB_RECIP_OTHER;
+
+	switch (req_id) {
+	case PCAN_USBPRO_REQ_FCT:
+		p = usb_sndctrlpipe(dev->udev, 0);
+		break;
+
+	default:
+		p = usb_rcvctrlpipe(dev->udev, 0);
+		req_type |= USB_DIR_IN;
+		memset(req_addr, '\0', req_size);
+		break;
+	}
+
+	err = usb_control_msg(dev->udev, p, req_id, req_type, req_value, 0,
+			      req_addr, req_size, 2 * USB_CTRL_GET_TIMEOUT);
+	if (err < 0) {
+		netdev_info(dev->netdev,
+			    "unable to request usb[type=%d value=%d] err=%d\n",
+			    req_id, req_value, err);
+		return err;
+	}
+
+	return 0;
+}
+
+static int pcan_usb_pro_set_ts(struct peak_usb_device *dev, u16 onoff)
+{
+	struct pcan_usb_pro_msg um;
+
+	pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
+	pcan_msg_add_rec(&um, PCAN_USBPRO_SETTS, onoff);
+
+	return pcan_usb_pro_send_cmd(dev, &um);
+}
+
+static int pcan_usb_pro_set_bitrate(struct peak_usb_device *dev, u32 ccbt)
+{
+	struct pcan_usb_pro_device *pdev =
+			container_of(dev, struct pcan_usb_pro_device, dev);
+	struct pcan_usb_pro_msg um;
+
+	pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
+	pcan_msg_add_rec(&um, PCAN_USBPRO_SETBTR, dev->ctrl_idx, ccbt);
+
+	/* cache the CCBT value to reuse it before next buson */
+	pdev->cached_ccbt = ccbt;
+
+	return pcan_usb_pro_send_cmd(dev, &um);
+}
+
+static int pcan_usb_pro_set_bus(struct peak_usb_device *dev, u8 onoff)
+{
+	struct pcan_usb_pro_msg um;
+
+	/* if bus=on, be sure the bitrate being set before! */
+	if (onoff) {
+		struct pcan_usb_pro_device *pdev =
+			     container_of(dev, struct pcan_usb_pro_device, dev);
+
+		pcan_usb_pro_set_bitrate(dev, pdev->cached_ccbt);
+	}
+
+	pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
+	pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, onoff);
+
+	return pcan_usb_pro_send_cmd(dev, &um);
+}
+
+static int pcan_usb_pro_set_silent(struct peak_usb_device *dev, u8 onoff)
+{
+	struct pcan_usb_pro_msg um;
+
+	pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
+	pcan_msg_add_rec(&um, PCAN_USBPRO_SETSILENT, dev->ctrl_idx, onoff);
+
+	return pcan_usb_pro_send_cmd(dev, &um);
+}
+
+static int pcan_usb_pro_set_filter(struct peak_usb_device *dev, u16 filter_mode)
+{
+	struct pcan_usb_pro_msg um;
+
+	pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
+	pcan_msg_add_rec(&um, PCAN_USBPRO_SETFILTR, dev->ctrl_idx, filter_mode);
+
+	return pcan_usb_pro_send_cmd(dev, &um);
+}
+
+static int pcan_usb_pro_set_led(struct peak_usb_device *dev, u8 mode,
+				u32 timeout)
+{
+	struct pcan_usb_pro_msg um;
+
+	pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
+	pcan_msg_add_rec(&um, PCAN_USBPRO_SETLED, dev->ctrl_idx, mode, timeout);
+
+	return pcan_usb_pro_send_cmd(dev, &um);
+}
+
+static int pcan_usb_pro_get_device_id(struct peak_usb_device *dev,
+				      u32 *device_id)
+{
+	struct pcan_usb_pro_devid *pdn;
+	struct pcan_usb_pro_msg um;
+	int err;
+	u8 *pc;
+
+	pc = pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
+	pcan_msg_add_rec(&um, PCAN_USBPRO_GETDEVID, dev->ctrl_idx);
+
+	err =  pcan_usb_pro_send_cmd(dev, &um);
+	if (err)
+		return err;
+
+	err = pcan_usb_pro_wait_rsp(dev, &um);
+	if (err)
+		return err;
+
+	pdn = (struct pcan_usb_pro_devid *)pc;
+	if (device_id)
+		*device_id = le32_to_cpu(pdn->serial_num);
+
+	return err;
+}
+
+static int pcan_usb_pro_set_bittiming(struct peak_usb_device *dev,
+				      struct can_bittiming *bt)
+{
+	u32 ccbt;
+
+	ccbt = (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 0x00800000 : 0;
+	ccbt |= (bt->sjw - 1) << 24;
+	ccbt |= (bt->phase_seg2 - 1) << 20;
+	ccbt |= (bt->prop_seg + bt->phase_seg1 - 1) << 16; /* = tseg1 */
+	ccbt |= bt->brp - 1;
+
+	netdev_info(dev->netdev, "setting ccbt=0x%08x\n", ccbt);
+
+	return pcan_usb_pro_set_bitrate(dev, ccbt);
+}
+
+void pcan_usb_pro_restart_complete(struct urb *urb)
+{
+	/* can delete usb resources */
+	peak_usb_async_complete(urb);
+
+	/* notify candev and netdev */
+	peak_usb_restart_complete(urb->context);
+}
+
+/*
+ * handle restart but in asynchronously way
+ */
+static int pcan_usb_pro_restart_async(struct peak_usb_device *dev,
+				      struct urb *urb, u8 *buf)
+{
+	struct pcan_usb_pro_msg um;
+
+	pcan_msg_init_empty(&um, buf, PCAN_USB_MAX_CMD_LEN);
+	pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, 1);
+
+	usb_fill_bulk_urb(urb, dev->udev,
+			usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
+			buf, PCAN_USB_MAX_CMD_LEN,
+			pcan_usb_pro_restart_complete, dev);
+
+	return usb_submit_urb(urb, GFP_ATOMIC);
+}
+
+static int pcan_usb_pro_drv_loaded(struct peak_usb_device *dev, int loaded)
+{
+	u8 *buffer;
+	int err;
+
+	buffer = kmalloc(PCAN_USBPRO_FCT_DRVLD_REQ_LEN, GFP_KERNEL);
+	if (!buffer)
+		return -ENOMEM;
+
+	buffer[0] = 0;
+	buffer[1] = !!loaded;
+
+	err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_FCT,
+				    PCAN_USBPRO_FCT_DRVLD, buffer,
+				    PCAN_USBPRO_FCT_DRVLD_REQ_LEN);
+	kfree(buffer);
+
+	return err;
+}
+
+static inline
+struct pcan_usb_pro_interface *pcan_usb_pro_dev_if(struct peak_usb_device *dev)
+{
+	struct pcan_usb_pro_device *pdev =
+			container_of(dev, struct pcan_usb_pro_device, dev);
+	return pdev->usb_if;
+}
+
+static int pcan_usb_pro_handle_canmsg(struct pcan_usb_pro_interface *usb_if,
+				      struct pcan_usb_pro_rxmsg *rx)
+{
+	const unsigned int ctrl_idx = (rx->len >> 4) & 0x0f;
+	struct peak_usb_device *dev = usb_if->dev[ctrl_idx];
+	struct net_device *netdev = dev->netdev;
+	struct can_frame *can_frame;
+	struct sk_buff *skb;
+	struct timeval tv;
+	struct skb_shared_hwtstamps *hwts;
+
+	skb = alloc_can_skb(netdev, &can_frame);
+	if (!skb)
+		return -ENOMEM;
+
+	can_frame->can_id = le32_to_cpu(rx->id);
+	can_frame->can_dlc = rx->len & 0x0f;
+
+	if (rx->flags & PCAN_USBPRO_EXT)
+		can_frame->can_id |= CAN_EFF_FLAG;
+
+	if (rx->flags & PCAN_USBPRO_RTR)
+		can_frame->can_id |= CAN_RTR_FLAG;
+	else
+		memcpy(can_frame->data, rx->data, can_frame->can_dlc);
+
+	peak_usb_get_ts_tv(&usb_if->time_ref, le32_to_cpu(rx->ts32), &tv);
+	hwts = skb_hwtstamps(skb);
+	hwts->hwtstamp = timeval_to_ktime(tv);
+
+	netif_rx(skb);
+	netdev->stats.rx_packets++;
+	netdev->stats.rx_bytes += can_frame->can_dlc;
+
+	return 0;
+}
+
+static int pcan_usb_pro_handle_error(struct pcan_usb_pro_interface *usb_if,
+				     struct pcan_usb_pro_rxstatus *er)
+{
+	const u16 raw_status = le16_to_cpu(er->status);
+	const unsigned int ctrl_idx = (er->channel >> 4) & 0x0f;
+	struct peak_usb_device *dev = usb_if->dev[ctrl_idx];
+	struct net_device *netdev = dev->netdev;
+	struct can_frame *can_frame;
+	enum can_state new_state = CAN_STATE_ERROR_ACTIVE;
+	u8 err_mask = 0;
+	struct sk_buff *skb;
+	struct timeval tv;
+	struct skb_shared_hwtstamps *hwts;
+
+	/* nothing should be sent while in BUS_OFF state */
+	if (dev->can.state == CAN_STATE_BUS_OFF)
+		return 0;
+
+	if (!raw_status) {
+		/* no error bit (back to active state) */
+		dev->can.state = CAN_STATE_ERROR_ACTIVE;
+		return 0;
+	}
+
+	if (raw_status & (PCAN_USBPRO_STATUS_OVERRUN |
+			  PCAN_USBPRO_STATUS_QOVERRUN)) {
+		/* trick to bypass next comparison and process other errors */
+		new_state = CAN_STATE_MAX;
+	}
+
+	if (raw_status & PCAN_USBPRO_STATUS_BUS) {
+		new_state = CAN_STATE_BUS_OFF;
+	} else if (raw_status & PCAN_USBPRO_STATUS_ERROR) {
+		u32 rx_err_cnt = (le32_to_cpu(er->err_frm) & 0x00ff0000) >> 16;
+		u32 tx_err_cnt = (le32_to_cpu(er->err_frm) & 0xff000000) >> 24;
+
+		if (rx_err_cnt > 127)
+			err_mask |= CAN_ERR_CRTL_RX_PASSIVE;
+		else if (rx_err_cnt > 96)
+			err_mask |= CAN_ERR_CRTL_RX_WARNING;
+
+		if (tx_err_cnt > 127)
+			err_mask |= CAN_ERR_CRTL_TX_PASSIVE;
+		else if (tx_err_cnt > 96)
+			err_mask |= CAN_ERR_CRTL_TX_WARNING;
+
+		if (err_mask & (CAN_ERR_CRTL_RX_WARNING |
+				CAN_ERR_CRTL_TX_WARNING))
+			new_state = CAN_STATE_ERROR_WARNING;
+		else if (err_mask & (CAN_ERR_CRTL_RX_PASSIVE |
+				     CAN_ERR_CRTL_TX_PASSIVE))
+			new_state = CAN_STATE_ERROR_PASSIVE;
+	}
+
+	/* donot post any error if current state didn't change */
+	if (dev->can.state == new_state)
+		return 0;
+
+	/* allocate an skb to store the error frame */
+	skb = alloc_can_err_skb(netdev, &can_frame);
+	if (!skb)
+		return -ENOMEM;
+
+	switch (new_state) {
+	case CAN_STATE_BUS_OFF:
+		can_frame->can_id |= CAN_ERR_BUSOFF;
+		dev->can.can_stats.bus_off++;
+		can_bus_off(netdev);
+		break;
+
+	case CAN_STATE_ERROR_PASSIVE:
+		can_frame->can_id |= CAN_ERR_CRTL;
+		can_frame->data[1] |= err_mask;
+		dev->can.can_stats.error_passive++;
+		break;
+
+	case CAN_STATE_ERROR_WARNING:
+		can_frame->can_id |= CAN_ERR_CRTL;
+		can_frame->data[1] |= err_mask;
+		dev->can.can_stats.error_warning++;
+		break;
+
+	case CAN_STATE_ERROR_ACTIVE:
+		break;
+
+	default:
+		/* CAN_STATE_MAX (trick to handle other errors) */
+		if (raw_status & PCAN_USBPRO_STATUS_OVERRUN) {
+			can_frame->can_id |= CAN_ERR_PROT;
+			can_frame->data[2] |= CAN_ERR_PROT_OVERLOAD;
+			netdev->stats.rx_over_errors++;
+			netdev->stats.rx_errors++;
+		}
+
+		if (raw_status & PCAN_USBPRO_STATUS_QOVERRUN) {
+			can_frame->can_id |= CAN_ERR_CRTL;
+			can_frame->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
+			netdev->stats.rx_over_errors++;
+			netdev->stats.rx_errors++;
+		}
+
+		new_state = CAN_STATE_ERROR_ACTIVE;
+		break;
+	}
+
+	dev->can.state = new_state;
+
+	peak_usb_get_ts_tv(&usb_if->time_ref, le32_to_cpu(er->ts32), &tv);
+	hwts = skb_hwtstamps(skb);
+	hwts->hwtstamp = timeval_to_ktime(tv);
+	netif_rx(skb);
+	netdev->stats.rx_packets++;
+	netdev->stats.rx_bytes += can_frame->can_dlc;
+
+	return 0;
+}
+
+static void pcan_usb_pro_handle_ts(struct pcan_usb_pro_interface *usb_if,
+				   struct pcan_usb_pro_rxts *ts)
+{
+	/* should wait until clock is stabilized */
+	if (usb_if->cm_ignore_count > 0)
+		usb_if->cm_ignore_count--;
+	else
+		peak_usb_set_ts_now(&usb_if->time_ref,
+				    le32_to_cpu(ts->ts64[1]));
+}
+
+/*
+ * callback for bulk IN urb
+ */
+static int pcan_usb_pro_decode_buf(struct peak_usb_device *dev, struct urb *urb)
+{
+	struct pcan_usb_pro_interface *usb_if = pcan_usb_pro_dev_if(dev);
+	struct net_device *netdev = dev->netdev;
+	struct pcan_usb_pro_msg usb_msg;
+	u8 *rec_ptr, *msg_end;
+	u16 rec_cnt;
+	int err = 0;
+
+	rec_ptr = pcan_msg_init(&usb_msg, urb->transfer_buffer,
+					urb->actual_length);
+	if (!rec_ptr) {
+		netdev_err(netdev, "bad msg hdr len %d\n", urb->actual_length);
+		return -EINVAL;
+	}
+
+	/* loop reading all the records from the incoming message */
+	msg_end = urb->transfer_buffer + urb->actual_length;
+	rec_cnt = le16_to_cpu(*usb_msg.u.rec_cnt_rd);
+	for (; rec_cnt > 0; rec_cnt--) {
+		union pcan_usb_pro_rec *pr = (union pcan_usb_pro_rec *)rec_ptr;
+		u16 sizeof_rec = pcan_usb_pro_sizeof_rec[pr->data_type];
+
+		if (!sizeof_rec) {
+			netdev_err(netdev,
+				   "got unsupported rec in usb msg:\n");
+			err = -ENOTSUPP;
+			break;
+		}
+
+		/* check if the record goes out of current packet */
+		if (rec_ptr + sizeof_rec > msg_end) {
+			netdev_err(netdev,
+				"got frag rec: should inc usb rx buf size\n");
+			err = -EBADMSG;
+			break;
+		}
+
+		switch (pr->data_type) {
+		case PCAN_USBPRO_RXMSG8:
+		case PCAN_USBPRO_RXMSG4:
+		case PCAN_USBPRO_RXMSG0:
+		case PCAN_USBPRO_RXRTR:
+			err = pcan_usb_pro_handle_canmsg(usb_if, &pr->rx_msg);
+			if (err < 0)
+				goto fail;
+			break;
+
+		case PCAN_USBPRO_RXSTATUS:
+			err = pcan_usb_pro_handle_error(usb_if, &pr->rx_status);
+			if (err < 0)
+				goto fail;
+			break;
+
+		case PCAN_USBPRO_RXTS:
+			pcan_usb_pro_handle_ts(usb_if, &pr->rx_ts);
+			break;
+
+		default:
+			netdev_err(netdev,
+				   "unhandled rec type 0x%02x (%d): ignored\n",
+				   pr->data_type, pr->data_type);
+			break;
+		}
+
+		rec_ptr += sizeof_rec;
+	}
+
+fail:
+	if (err)
+		pcan_dump_mem("received msg",
+			      urb->transfer_buffer, urb->actual_length);
+
+	return err;
+}
+
+static int pcan_usb_pro_encode_msg(struct peak_usb_device *dev,
+				   struct sk_buff *skb, u8 *obuf, size_t *size)
+{
+	struct can_frame *cf = (struct can_frame *)skb->data;
+	u8 data_type, len, flags;
+	struct pcan_usb_pro_msg usb_msg;
+
+	pcan_msg_init_empty(&usb_msg, obuf, *size);
+
+	if ((cf->can_id & CAN_RTR_FLAG) || (cf->can_dlc == 0))
+		data_type = PCAN_USBPRO_TXMSG0;
+	else if (cf->can_dlc <= 4)
+		data_type = PCAN_USBPRO_TXMSG4;
+	else
+		data_type = PCAN_USBPRO_TXMSG8;
+
+	len = (dev->ctrl_idx << 4) | (cf->can_dlc & 0x0f);
+
+	flags = 0;
+	if (cf->can_id & CAN_EFF_FLAG)
+		flags |= 0x02;
+	if (cf->can_id & CAN_RTR_FLAG)
+		flags |= 0x01;
+
+	pcan_msg_add_rec(&usb_msg, data_type, 0, flags, len, cf->can_id,
+			 cf->data);
+
+	*size = usb_msg.rec_buffer_len;
+
+	return 0;
+}
+
+static int pcan_usb_pro_start(struct peak_usb_device *dev)
+{
+	struct pcan_usb_pro_device *pdev =
+			container_of(dev, struct pcan_usb_pro_device, dev);
+	int err;
+
+	err = pcan_usb_pro_set_silent(dev,
+				dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY);
+	if (err)
+		return err;
+
+	/* filter mode: 0-> All OFF; 1->bypass */
+	err = pcan_usb_pro_set_filter(dev, 1);
+	if (err)
+		return err;
+
+	/* opening first device: */
+	if (pdev->usb_if->dev_opened_count == 0) {
+		/* reset time_ref */
+		peak_usb_init_time_ref(&pdev->usb_if->time_ref, &pcan_usb_pro);
+
+		/* ask device to send ts messages */
+		err = pcan_usb_pro_set_ts(dev, 1);
+	}
+
+	pdev->usb_if->dev_opened_count++;
+
+	return err;
+}
+
+/*
+ * stop interface
+ * (last chance before set bus off)
+ */
+static int pcan_usb_pro_stop(struct peak_usb_device *dev)
+{
+	struct pcan_usb_pro_device *pdev =
+			container_of(dev, struct pcan_usb_pro_device, dev);
+
+	/* turn off ts msgs for that interface if no other dev opened */
+	if (pdev->usb_if->dev_opened_count == 1)
+		pcan_usb_pro_set_ts(dev, 0);
+
+	pdev->usb_if->dev_opened_count--;
+
+	return 0;
+}
+
+/*
+ * called when probing to initialize a device object.
+ */
+static int pcan_usb_pro_init(struct peak_usb_device *dev)
+{
+	struct pcan_usb_pro_device *pdev =
+			container_of(dev, struct pcan_usb_pro_device, dev);
+	struct pcan_usb_pro_interface *usb_if = NULL;
+	struct pcan_usb_pro_fwinfo *fi = NULL;
+	struct pcan_usb_pro_blinfo *bi = NULL;
+	int err;
+
+	/* do this for 1st channel only */
+	if (!dev->prev_siblings) {
+		/* allocate netdevices common structure attached to first one */
+		usb_if = kzalloc(sizeof(struct pcan_usb_pro_interface),
+				 GFP_KERNEL);
+		fi = kmalloc(sizeof(struct pcan_usb_pro_fwinfo), GFP_KERNEL);
+		bi = kmalloc(sizeof(struct pcan_usb_pro_blinfo), GFP_KERNEL);
+		if (!usb_if || !fi || !bi) {
+			err = -ENOMEM;
+			goto err_out;
+		}
+
+		/* number of ts msgs to ignore before taking one into account */
+		usb_if->cm_ignore_count = 5;
+
+		/*
+		 * explicit use of dev_xxx() instead of netdev_xxx() here:
+		 * information displayed are related to the device itself, not
+		 * to the canx netdevices.
+		 */
+		err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
+					    PCAN_USBPRO_INFO_FW,
+					    fi, sizeof(*fi));
+		if (err) {
+			dev_err(dev->netdev->dev.parent,
+				"unable to read %s firmware info (err %d)\n",
+				pcan_usb_pro.name, err);
+			goto err_out;
+		}
+
+		err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
+					    PCAN_USBPRO_INFO_BL,
+					    bi, sizeof(*bi));
+		if (err) {
+			dev_err(dev->netdev->dev.parent,
+				"unable to read %s bootloader info (err %d)\n",
+				pcan_usb_pro.name, err);
+			goto err_out;
+		}
+
+		/* tell the device the can driver is running */
+		err = pcan_usb_pro_drv_loaded(dev, 1);
+		if (err)
+			goto err_out;
+
+		dev_info(dev->netdev->dev.parent,
+		     "PEAK-System %s hwrev %u serial %08X.%08X (%u channels)\n",
+		     pcan_usb_pro.name,
+		     bi->hw_rev, bi->serial_num_hi, bi->serial_num_lo,
+		     pcan_usb_pro.ctrl_count);
+	} else {
+		usb_if = pcan_usb_pro_dev_if(dev->prev_siblings);
+	}
+
+	pdev->usb_if = usb_if;
+	usb_if->dev[dev->ctrl_idx] = dev;
+
+	/* set LED in default state (end of init phase) */
+	pcan_usb_pro_set_led(dev, 0, 1);
+
+	kfree(bi);
+	kfree(fi);
+
+	return 0;
+
+ err_out:
+	kfree(bi);
+	kfree(fi);
+	kfree(usb_if);
+
+	return err;
+}
+
+static void pcan_usb_pro_exit(struct peak_usb_device *dev)
+{
+	struct pcan_usb_pro_device *pdev =
+			container_of(dev, struct pcan_usb_pro_device, dev);
+
+	/*
+	 * when rmmod called before unplug and if down, should reset things
+	 * before leaving
+	 */
+	if (dev->can.state != CAN_STATE_STOPPED) {
+		/* set bus off on the corresponding channel */
+		pcan_usb_pro_set_bus(dev, 0);
+	}
+
+	/* if channel #0 (only) */
+	if (dev->ctrl_idx == 0) {
+		/* turn off calibration message if any device were opened */
+		if (pdev->usb_if->dev_opened_count > 0)
+			pcan_usb_pro_set_ts(dev, 0);
+
+		/* tell the PCAN-USB Pro device the driver is being unloaded */
+		pcan_usb_pro_drv_loaded(dev, 0);
+	}
+}
+
+/*
+ * called when PCAN-USB Pro adapter is unplugged
+ */
+static void pcan_usb_pro_free(struct peak_usb_device *dev)
+{
+	/* last device: can free pcan_usb_pro_interface object now */
+	if (!dev->prev_siblings && !dev->next_siblings)
+		kfree(pcan_usb_pro_dev_if(dev));
+}
+
+/*
+ * probe function for new PCAN-USB Pro usb interface
+ */
+int pcan_usb_pro_probe(struct usb_interface *intf)
+{
+	struct usb_host_interface *if_desc;
+	int i;
+
+	if_desc = intf->altsetting;
+
+	/* check interface endpoint addresses */
+	for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
+		struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
+
+		/*
+		 * below is the list of valid ep addreses. Any other ep address
+		 * is considered as not-CAN interface address => no dev created
+		 */
+		switch (ep->bEndpointAddress) {
+		case PCAN_USBPRO_EP_CMDOUT:
+		case PCAN_USBPRO_EP_CMDIN:
+		case PCAN_USBPRO_EP_MSGOUT_0:
+		case PCAN_USBPRO_EP_MSGOUT_1:
+		case PCAN_USBPRO_EP_MSGIN:
+		case PCAN_USBPRO_EP_UNUSED:
+			break;
+		default:
+			return -ENODEV;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * describe the PCAN-USB Pro adapter
+ */
+const struct peak_usb_adapter pcan_usb_pro = {
+	.name = "PCAN-USB Pro",
+	.device_id = PCAN_USBPRO_PRODUCT_ID,
+	.ctrl_count = PCAN_USBPRO_CHANNEL_COUNT,
+	.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
+	.clock = {
+		.freq = PCAN_USBPRO_CRYSTAL_HZ,
+	},
+	.bittiming_const = {
+		.name = "pcan_usb_pro",
+		.tseg1_min = 1,
+		.tseg1_max = 16,
+		.tseg2_min = 1,
+		.tseg2_max = 8,
+		.sjw_max = 4,
+		.brp_min = 1,
+		.brp_max = 1024,
+		.brp_inc = 1,
+	},
+
+	/* size of device private data */
+	.sizeof_dev_private = sizeof(struct pcan_usb_pro_device),
+
+	/* timestamps usage */
+	.ts_used_bits = 32,
+	.ts_period = 1000000, /* calibration period in ts. */
+	.us_per_ts_scale = 1, /* us = (ts * scale) >> shift */
+	.us_per_ts_shift = 0,
+
+	/* give here messages in/out endpoints */
+	.ep_msg_in = PCAN_USBPRO_EP_MSGIN,
+	.ep_msg_out = {PCAN_USBPRO_EP_MSGOUT_0, PCAN_USBPRO_EP_MSGOUT_1},
+
+	/* size of rx/tx usb buffers */
+	.rx_buffer_size = PCAN_USBPRO_RX_BUFFER_SIZE,
+	.tx_buffer_size = PCAN_USBPRO_TX_BUFFER_SIZE,
+
+	/* device callbacks */
+	.intf_probe = pcan_usb_pro_probe,
+	.dev_init = pcan_usb_pro_init,
+	.dev_exit = pcan_usb_pro_exit,
+	.dev_free = pcan_usb_pro_free,
+	.dev_set_bus = pcan_usb_pro_set_bus,
+	.dev_set_bittiming = pcan_usb_pro_set_bittiming,
+	.dev_get_device_id = pcan_usb_pro_get_device_id,
+	.dev_decode_buf = pcan_usb_pro_decode_buf,
+	.dev_encode_msg = pcan_usb_pro_encode_msg,
+	.dev_start = pcan_usb_pro_start,
+	.dev_stop = pcan_usb_pro_stop,
+	.dev_restart_async = pcan_usb_pro_restart_async,
+};
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.h b/drivers/net/can/usb/peak_usb/pcan_usb_pro.h
new file mode 100644
index 000000000..a62f7ab89
--- /dev/null
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.h
@@ -0,0 +1,192 @@
+/*
+ * CAN driver for PEAK System PCAN-USB Pro adapter
+ * Derived from the PCAN project file driver/src/pcan_usbpro_fw.h
+ *
+ * Copyright (C) 2003-2011 PEAK System-Technik GmbH
+ * Copyright (C) 2011-2012 Stephane Grosjean <s.grosjean@peak-system.com>
+ *
+ * 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 of the License.
+ *
+ * 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.
+ */
+#ifndef PCAN_USB_PRO_H
+#define PCAN_USB_PRO_H
+
+/*
+ * USB Vendor request data types
+ */
+#define PCAN_USBPRO_REQ_INFO		0
+#define PCAN_USBPRO_REQ_FCT		2
+
+/* Vendor Request value for XXX_INFO */
+#define PCAN_USBPRO_INFO_BL		0
+#define PCAN_USBPRO_INFO_FW		1
+
+/* PCAN-USB Pro (FD) Endpoints */
+#define PCAN_USBPRO_EP_CMDOUT		1
+#define PCAN_USBPRO_EP_CMDIN		(PCAN_USBPRO_EP_CMDOUT | USB_DIR_IN)
+#define PCAN_USBPRO_EP_MSGOUT_0		2
+#define PCAN_USBPRO_EP_MSGIN		(PCAN_USBPRO_EP_MSGOUT_0 | USB_DIR_IN)
+#define PCAN_USBPRO_EP_MSGOUT_1		3
+#define PCAN_USBPRO_EP_UNUSED		(PCAN_USBPRO_EP_MSGOUT_1 | USB_DIR_IN)
+
+/* Vendor Request value for XXX_FCT */
+#define PCAN_USBPRO_FCT_DRVLD		5 /* tell device driver is loaded */
+#define PCAN_USBPRO_FCT_DRVLD_REQ_LEN	16
+
+/* PCAN_USBPRO_INFO_BL vendor request record type */
+struct __packed pcan_usb_pro_blinfo {
+	__le32 ctrl_type;
+	u8  version[4];
+	u8  day;
+	u8  month;
+	u8  year;
+	u8  dummy;
+	__le32 serial_num_hi;
+	__le32 serial_num_lo;
+	__le32 hw_type;
+	__le32 hw_rev;
+};
+
+/* PCAN_USBPRO_INFO_FW vendor request record type */
+struct __packed pcan_usb_pro_fwinfo {
+	__le32 ctrl_type;
+	u8  version[4];
+	u8  day;
+	u8  month;
+	u8  year;
+	u8  dummy;
+	__le32 fw_type;
+};
+
+/*
+ * USB Command record types
+ */
+#define PCAN_USBPRO_SETBTR	0x02
+#define PCAN_USBPRO_SETBUSACT	0x04
+#define PCAN_USBPRO_SETSILENT	0x05
+#define PCAN_USBPRO_SETFILTR	0x0a
+#define PCAN_USBPRO_SETTS	0x10
+#define PCAN_USBPRO_GETDEVID	0x12
+#define PCAN_USBPRO_SETLED	0x1C
+#define PCAN_USBPRO_RXMSG8	0x80
+#define PCAN_USBPRO_RXMSG4	0x81
+#define PCAN_USBPRO_RXMSG0	0x82
+#define PCAN_USBPRO_RXRTR	0x83
+#define PCAN_USBPRO_RXSTATUS	0x84
+#define PCAN_USBPRO_RXTS	0x85
+#define PCAN_USBPRO_TXMSG8	0x41
+#define PCAN_USBPRO_TXMSG4	0x42
+#define PCAN_USBPRO_TXMSG0	0x43
+
+/* record structures */
+struct __packed pcan_usb_pro_btr {
+	u8  data_type;
+	u8  channel;
+	__le16 dummy;
+	__le32 CCBT;
+};
+
+struct __packed pcan_usb_pro_busact {
+	u8  data_type;
+	u8  channel;
+	__le16 onoff;
+};
+
+struct __packed pcan_usb_pro_silent {
+	u8  data_type;
+	u8  channel;
+	__le16 onoff;
+};
+
+struct __packed pcan_usb_pro_filter {
+	u8  data_type;
+	u8  dummy;
+	__le16 filter_mode;
+};
+
+struct __packed pcan_usb_pro_setts {
+	u8  data_type;
+	u8  dummy;
+	__le16 mode;
+};
+
+struct __packed pcan_usb_pro_devid {
+	u8  data_type;
+	u8  channel;
+	__le16 dummy;
+	__le32 serial_num;
+};
+
+struct __packed pcan_usb_pro_setled {
+	u8  data_type;
+	u8  channel;
+	__le16 mode;
+	__le32 timeout;
+};
+
+struct __packed pcan_usb_pro_rxmsg {
+	u8  data_type;
+	u8  client;
+	u8  flags;
+	u8  len;
+	__le32 ts32;
+	__le32 id;
+
+	u8  data[8];
+};
+
+#define PCAN_USBPRO_STATUS_ERROR	0x0001
+#define PCAN_USBPRO_STATUS_BUS		0x0002
+#define PCAN_USBPRO_STATUS_OVERRUN	0x0004
+#define PCAN_USBPRO_STATUS_QOVERRUN	0x0008
+
+struct __packed pcan_usb_pro_rxstatus {
+	u8  data_type;
+	u8  channel;
+	__le16 status;
+	__le32 ts32;
+	__le32 err_frm;
+};
+
+struct __packed pcan_usb_pro_rxts {
+	u8  data_type;
+	u8  dummy[3];
+	__le32 ts64[2];
+};
+
+struct __packed pcan_usb_pro_txmsg {
+	u8  data_type;
+	u8  client;
+	u8  flags;
+	u8  len;
+	__le32 id;
+	u8  data[8];
+};
+
+union pcan_usb_pro_rec {
+	u8				data_type;
+	struct pcan_usb_pro_btr		btr;
+	struct pcan_usb_pro_busact	bus_act;
+	struct pcan_usb_pro_silent	silent_mode;
+	struct pcan_usb_pro_filter	filter_mode;
+	struct pcan_usb_pro_setts	ts;
+	struct pcan_usb_pro_devid	dev_id;
+	struct pcan_usb_pro_setled	set_led;
+	struct pcan_usb_pro_rxmsg	rx_msg;
+	struct pcan_usb_pro_rxstatus	rx_status;
+	struct pcan_usb_pro_rxts	rx_ts;
+	struct pcan_usb_pro_txmsg	tx_msg;
+};
+
+int pcan_usb_pro_probe(struct usb_interface *intf);
+int pcan_usb_pro_send_req(struct peak_usb_device *dev, int req_id,
+			  int req_value, void *req_addr, int req_size);
+void pcan_usb_pro_restart_complete(struct urb *urb);
+
+#endif
diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
new file mode 100644
index 000000000..dd52c7a4c
--- /dev/null
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -0,0 +1,1036 @@
+/*
+ * CAN driver for "8 devices" USB2CAN converter
+ *
+ * Copyright (C) 2012 Bernd Krumboeck (krumboeck@universalnet.at)
+ *
+ * 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 of the License.
+ *
+ * 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.
+ *
+ * This driver is inspired by the 3.2.0 version of drivers/net/can/usb/ems_usb.c
+ * and drivers/net/can/usb/esd_usb2.c
+ *
+ * Many thanks to Gerhard Bertelsmann (info@gerhard-bertelsmann.de)
+ * for testing and fixing this driver. Also many thanks to "8 devices",
+ * who were very cooperative and answered my questions.
+ */
+
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+#include <linux/can/led.h>
+
+/* driver constants */
+#define MAX_RX_URBS			20
+#define MAX_TX_URBS			20
+#define RX_BUFFER_SIZE			64
+
+/* vendor and product id */
+#define USB_8DEV_VENDOR_ID		0x0483
+#define USB_8DEV_PRODUCT_ID		0x1234
+
+/* endpoints */
+enum usb_8dev_endpoint {
+	USB_8DEV_ENDP_DATA_RX = 1,
+	USB_8DEV_ENDP_DATA_TX,
+	USB_8DEV_ENDP_CMD_RX,
+	USB_8DEV_ENDP_CMD_TX
+};
+
+/* device CAN clock */
+#define USB_8DEV_ABP_CLOCK		32000000
+
+/* setup flags */
+#define USB_8DEV_SILENT			0x01
+#define USB_8DEV_LOOPBACK		0x02
+#define USB_8DEV_DISABLE_AUTO_RESTRANS	0x04
+#define USB_8DEV_STATUS_FRAME		0x08
+
+/* commands */
+enum usb_8dev_cmd {
+	USB_8DEV_RESET = 1,
+	USB_8DEV_OPEN,
+	USB_8DEV_CLOSE,
+	USB_8DEV_SET_SPEED,
+	USB_8DEV_SET_MASK_FILTER,
+	USB_8DEV_GET_STATUS,
+	USB_8DEV_GET_STATISTICS,
+	USB_8DEV_GET_SERIAL,
+	USB_8DEV_GET_SOFTW_VER,
+	USB_8DEV_GET_HARDW_VER,
+	USB_8DEV_RESET_TIMESTAMP,
+	USB_8DEV_GET_SOFTW_HARDW_VER
+};
+
+/* command options */
+#define USB_8DEV_BAUD_MANUAL		0x09
+#define USB_8DEV_CMD_START		0x11
+#define USB_8DEV_CMD_END		0x22
+
+#define USB_8DEV_CMD_SUCCESS		0
+#define USB_8DEV_CMD_ERROR		255
+
+#define USB_8DEV_CMD_TIMEOUT		1000
+
+/* frames */
+#define USB_8DEV_DATA_START		0x55
+#define USB_8DEV_DATA_END		0xAA
+
+#define USB_8DEV_TYPE_CAN_FRAME		0
+#define USB_8DEV_TYPE_ERROR_FRAME	3
+
+#define USB_8DEV_EXTID			0x01
+#define USB_8DEV_RTR			0x02
+#define USB_8DEV_ERR_FLAG		0x04
+
+/* status */
+#define USB_8DEV_STATUSMSG_OK		0x00  /* Normal condition. */
+#define USB_8DEV_STATUSMSG_OVERRUN	0x01  /* Overrun occured when sending */
+#define USB_8DEV_STATUSMSG_BUSLIGHT	0x02  /* Error counter has reached 96 */
+#define USB_8DEV_STATUSMSG_BUSHEAVY	0x03  /* Error count. has reached 128 */
+#define USB_8DEV_STATUSMSG_BUSOFF	0x04  /* Device is in BUSOFF */
+#define USB_8DEV_STATUSMSG_STUFF	0x20  /* Stuff Error */
+#define USB_8DEV_STATUSMSG_FORM		0x21  /* Form Error */
+#define USB_8DEV_STATUSMSG_ACK		0x23  /* Ack Error */
+#define USB_8DEV_STATUSMSG_BIT0		0x24  /* Bit1 Error */
+#define USB_8DEV_STATUSMSG_BIT1		0x25  /* Bit0 Error */
+#define USB_8DEV_STATUSMSG_CRC		0x27  /* CRC Error */
+
+#define USB_8DEV_RP_MASK		0x7F  /* Mask for Receive Error Bit */
+
+
+/* table of devices that work with this driver */
+static const struct usb_device_id usb_8dev_table[] = {
+	{ USB_DEVICE(USB_8DEV_VENDOR_ID, USB_8DEV_PRODUCT_ID) },
+	{ }					/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, usb_8dev_table);
+
+struct usb_8dev_tx_urb_context {
+	struct usb_8dev_priv *priv;
+
+	u32 echo_index;
+	u8 dlc;
+};
+
+/* Structure to hold all of our device specific stuff */
+struct usb_8dev_priv {
+	struct can_priv can; /* must be the first member */
+
+	struct sk_buff *echo_skb[MAX_TX_URBS];
+
+	struct usb_device *udev;
+	struct net_device *netdev;
+
+	atomic_t active_tx_urbs;
+	struct usb_anchor tx_submitted;
+	struct usb_8dev_tx_urb_context tx_contexts[MAX_TX_URBS];
+
+	struct usb_anchor rx_submitted;
+
+	struct can_berr_counter bec;
+
+	u8 *cmd_msg_buffer;
+
+	struct mutex usb_8dev_cmd_lock;
+
+};
+
+/* tx frame */
+struct __packed usb_8dev_tx_msg {
+	u8 begin;
+	u8 flags;	/* RTR and EXT_ID flag */
+	__be32 id;	/* upper 3 bits not used */
+	u8 dlc;		/* data length code 0-8 bytes */
+	u8 data[8];	/* 64-bit data */
+	u8 end;
+};
+
+/* rx frame */
+struct __packed usb_8dev_rx_msg {
+	u8 begin;
+	u8 type;		/* frame type */
+	u8 flags;		/* RTR and EXT_ID flag */
+	__be32 id;		/* upper 3 bits not used */
+	u8 dlc;			/* data length code 0-8 bytes */
+	u8 data[8];		/* 64-bit data */
+	__be32 timestamp;	/* 32-bit timestamp */
+	u8 end;
+};
+
+/* command frame */
+struct __packed usb_8dev_cmd_msg {
+	u8 begin;
+	u8 channel;	/* unkown - always 0 */
+	u8 command;	/* command to execute */
+	u8 opt1;	/* optional parameter / return value */
+	u8 opt2;	/* optional parameter 2 */
+	u8 data[10];	/* optional parameter and data */
+	u8 end;
+};
+
+static int usb_8dev_send_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size)
+{
+	int actual_length;
+
+	return usb_bulk_msg(priv->udev,
+			    usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_TX),
+			    msg, size, &actual_length, USB_8DEV_CMD_TIMEOUT);
+}
+
+static int usb_8dev_wait_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size,
+				int *actual_length)
+{
+	return usb_bulk_msg(priv->udev,
+			    usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_RX),
+			    msg, size, actual_length, USB_8DEV_CMD_TIMEOUT);
+}
+
+/* Send command to device and receive result.
+ * Command was successful when opt1 = 0.
+ */
+static int usb_8dev_send_cmd(struct usb_8dev_priv *priv,
+			     struct usb_8dev_cmd_msg *out,
+			     struct usb_8dev_cmd_msg *in)
+{
+	int err;
+	int num_bytes_read;
+	struct net_device *netdev;
+
+	netdev = priv->netdev;
+
+	out->begin = USB_8DEV_CMD_START;
+	out->end = USB_8DEV_CMD_END;
+
+	mutex_lock(&priv->usb_8dev_cmd_lock);
+
+	memcpy(priv->cmd_msg_buffer, out,
+		sizeof(struct usb_8dev_cmd_msg));
+
+	err = usb_8dev_send_cmd_msg(priv, priv->cmd_msg_buffer,
+				    sizeof(struct usb_8dev_cmd_msg));
+	if (err < 0) {
+		netdev_err(netdev, "sending command message failed\n");
+		goto failed;
+	}
+
+	err = usb_8dev_wait_cmd_msg(priv, priv->cmd_msg_buffer,
+				    sizeof(struct usb_8dev_cmd_msg),
+				    &num_bytes_read);
+	if (err < 0) {
+		netdev_err(netdev, "no command message answer\n");
+		goto failed;
+	}
+
+	memcpy(in, priv->cmd_msg_buffer, sizeof(struct usb_8dev_cmd_msg));
+
+	if (in->begin != USB_8DEV_CMD_START || in->end != USB_8DEV_CMD_END ||
+			num_bytes_read != 16 || in->opt1 != 0)
+		err = -EPROTO;
+
+failed:
+	mutex_unlock(&priv->usb_8dev_cmd_lock);
+	return err;
+}
+
+/* Send open command to device */
+static int usb_8dev_cmd_open(struct usb_8dev_priv *priv)
+{
+	struct can_bittiming *bt = &priv->can.bittiming;
+	struct usb_8dev_cmd_msg outmsg;
+	struct usb_8dev_cmd_msg inmsg;
+	u32 ctrlmode = priv->can.ctrlmode;
+	u32 flags = USB_8DEV_STATUS_FRAME;
+	__be32 beflags;
+	__be16 bebrp;
+
+	memset(&outmsg, 0, sizeof(outmsg));
+	outmsg.command = USB_8DEV_OPEN;
+	outmsg.opt1 = USB_8DEV_BAUD_MANUAL;
+	outmsg.data[0] = bt->prop_seg + bt->phase_seg1;
+	outmsg.data[1] = bt->phase_seg2;
+	outmsg.data[2] = bt->sjw;
+
+	/* BRP */
+	bebrp = cpu_to_be16((u16)bt->brp);
+	memcpy(&outmsg.data[3], &bebrp, sizeof(bebrp));
+
+	/* flags */
+	if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
+		flags |= USB_8DEV_LOOPBACK;
+	if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
+		flags |= USB_8DEV_SILENT;
+	if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
+		flags |= USB_8DEV_DISABLE_AUTO_RESTRANS;
+
+	beflags = cpu_to_be32(flags);
+	memcpy(&outmsg.data[5], &beflags, sizeof(beflags));
+
+	return usb_8dev_send_cmd(priv, &outmsg, &inmsg);
+}
+
+/* Send close command to device */
+static int usb_8dev_cmd_close(struct usb_8dev_priv *priv)
+{
+	struct usb_8dev_cmd_msg inmsg;
+	struct usb_8dev_cmd_msg outmsg = {
+		.channel = 0,
+		.command = USB_8DEV_CLOSE,
+		.opt1 = 0,
+		.opt2 = 0
+	};
+
+	return usb_8dev_send_cmd(priv, &outmsg, &inmsg);
+}
+
+/* Get firmware and hardware version */
+static int usb_8dev_cmd_version(struct usb_8dev_priv *priv, u32 *res)
+{
+	struct usb_8dev_cmd_msg	inmsg;
+	struct usb_8dev_cmd_msg	outmsg = {
+		.channel = 0,
+		.command = USB_8DEV_GET_SOFTW_HARDW_VER,
+		.opt1 = 0,
+		.opt2 = 0
+	};
+
+	int err = usb_8dev_send_cmd(priv, &outmsg, &inmsg);
+	if (err)
+		return err;
+
+	*res = be32_to_cpup((__be32 *)inmsg.data);
+
+	return err;
+}
+
+/* Set network device mode
+ *
+ * Maybe we should leave this function empty, because the device
+ * set mode variable with open command.
+ */
+static int usb_8dev_set_mode(struct net_device *netdev, enum can_mode mode)
+{
+	struct usb_8dev_priv *priv = netdev_priv(netdev);
+	int err = 0;
+
+	switch (mode) {
+	case CAN_MODE_START:
+		err = usb_8dev_cmd_open(priv);
+		if (err)
+			netdev_warn(netdev, "couldn't start device");
+		break;
+
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return err;
+}
+
+/* Read error/status frames */
+static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv,
+				struct usb_8dev_rx_msg *msg)
+{
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	struct net_device_stats *stats = &priv->netdev->stats;
+
+	/* Error message:
+	 * byte 0: Status
+	 * byte 1: bit   7: Receive Passive
+	 * byte 1: bit 0-6: Receive Error Counter
+	 * byte 2: Transmit Error Counter
+	 * byte 3: Always 0 (maybe reserved for future use)
+	 */
+
+	u8 state = msg->data[0];
+	u8 rxerr = msg->data[1] & USB_8DEV_RP_MASK;
+	u8 txerr = msg->data[2];
+	int rx_errors = 0;
+	int tx_errors = 0;
+
+	skb = alloc_can_err_skb(priv->netdev, &cf);
+	if (!skb)
+		return;
+
+	switch (state) {
+	case USB_8DEV_STATUSMSG_OK:
+		priv->can.state = CAN_STATE_ERROR_ACTIVE;
+		cf->can_id |= CAN_ERR_PROT;
+		cf->data[2] = CAN_ERR_PROT_ACTIVE;
+		break;
+	case USB_8DEV_STATUSMSG_BUSOFF:
+		priv->can.state = CAN_STATE_BUS_OFF;
+		cf->can_id |= CAN_ERR_BUSOFF;
+		priv->can.can_stats.bus_off++;
+		can_bus_off(priv->netdev);
+		break;
+	case USB_8DEV_STATUSMSG_OVERRUN:
+	case USB_8DEV_STATUSMSG_BUSLIGHT:
+	case USB_8DEV_STATUSMSG_BUSHEAVY:
+		cf->can_id |= CAN_ERR_CRTL;
+		break;
+	default:
+		priv->can.state = CAN_STATE_ERROR_WARNING;
+		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+		priv->can.can_stats.bus_error++;
+		break;
+	}
+
+	switch (state) {
+	case USB_8DEV_STATUSMSG_OK:
+	case USB_8DEV_STATUSMSG_BUSOFF:
+		break;
+	case USB_8DEV_STATUSMSG_ACK:
+		cf->can_id |= CAN_ERR_ACK;
+		tx_errors = 1;
+		break;
+	case USB_8DEV_STATUSMSG_CRC:
+		cf->data[2] |= CAN_ERR_PROT_UNSPEC;
+		cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ |
+			       CAN_ERR_PROT_LOC_CRC_DEL;
+		rx_errors = 1;
+		break;
+	case USB_8DEV_STATUSMSG_BIT0:
+		cf->data[2] |= CAN_ERR_PROT_BIT0;
+		tx_errors = 1;
+		break;
+	case USB_8DEV_STATUSMSG_BIT1:
+		cf->data[2] |= CAN_ERR_PROT_BIT1;
+		tx_errors = 1;
+		break;
+	case USB_8DEV_STATUSMSG_FORM:
+		cf->data[2] |= CAN_ERR_PROT_FORM;
+		rx_errors = 1;
+		break;
+	case USB_8DEV_STATUSMSG_STUFF:
+		cf->data[2] |= CAN_ERR_PROT_STUFF;
+		rx_errors = 1;
+		break;
+	case USB_8DEV_STATUSMSG_OVERRUN:
+		cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
+		stats->rx_over_errors++;
+		rx_errors = 1;
+		break;
+	case USB_8DEV_STATUSMSG_BUSLIGHT:
+		priv->can.state = CAN_STATE_ERROR_WARNING;
+		cf->data[1] = (txerr > rxerr) ?
+			CAN_ERR_CRTL_TX_WARNING :
+			CAN_ERR_CRTL_RX_WARNING;
+		priv->can.can_stats.error_warning++;
+		break;
+	case USB_8DEV_STATUSMSG_BUSHEAVY:
+		priv->can.state = CAN_STATE_ERROR_PASSIVE;
+		cf->data[1] = (txerr > rxerr) ?
+			CAN_ERR_CRTL_TX_PASSIVE :
+			CAN_ERR_CRTL_RX_PASSIVE;
+		priv->can.can_stats.error_passive++;
+		break;
+	default:
+		netdev_warn(priv->netdev,
+			    "Unknown status/error message (%d)\n", state);
+		break;
+	}
+
+	if (tx_errors) {
+		cf->data[2] |= CAN_ERR_PROT_TX;
+		stats->tx_errors++;
+	}
+
+	if (rx_errors)
+		stats->rx_errors++;
+
+	cf->data[6] = txerr;
+	cf->data[7] = rxerr;
+
+	priv->bec.txerr = txerr;
+	priv->bec.rxerr = rxerr;
+
+	netif_rx(skb);
+
+	stats->rx_packets++;
+	stats->rx_bytes += cf->can_dlc;
+}
+
+/* Read data and status frames */
+static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
+				struct usb_8dev_rx_msg *msg)
+{
+	struct can_frame *cf;
+	struct sk_buff *skb;
+	struct net_device_stats *stats = &priv->netdev->stats;
+
+	if (msg->type == USB_8DEV_TYPE_ERROR_FRAME &&
+		   msg->flags == USB_8DEV_ERR_FLAG) {
+		usb_8dev_rx_err_msg(priv, msg);
+	} else if (msg->type == USB_8DEV_TYPE_CAN_FRAME) {
+		skb = alloc_can_skb(priv->netdev, &cf);
+		if (!skb)
+			return;
+
+		cf->can_id = be32_to_cpu(msg->id);
+		cf->can_dlc = get_can_dlc(msg->dlc & 0xF);
+
+		if (msg->flags & USB_8DEV_EXTID)
+			cf->can_id |= CAN_EFF_FLAG;
+
+		if (msg->flags & USB_8DEV_RTR)
+			cf->can_id |= CAN_RTR_FLAG;
+		else
+			memcpy(cf->data, msg->data, cf->can_dlc);
+
+		netif_rx(skb);
+
+		stats->rx_packets++;
+		stats->rx_bytes += cf->can_dlc;
+
+		can_led_event(priv->netdev, CAN_LED_EVENT_RX);
+	} else {
+		netdev_warn(priv->netdev, "frame type %d unknown",
+			 msg->type);
+	}
+
+}
+
+/* Callback for reading data from device
+ *
+ * Check urb status, call read function and resubmit urb read operation.
+ */
+static void usb_8dev_read_bulk_callback(struct urb *urb)
+{
+	struct usb_8dev_priv *priv = urb->context;
+	struct net_device *netdev;
+	int retval;
+	int pos = 0;
+
+	netdev = priv->netdev;
+
+	if (!netif_device_present(netdev))
+		return;
+
+	switch (urb->status) {
+	case 0: /* success */
+		break;
+
+	case -ENOENT:
+	case -ESHUTDOWN:
+		return;
+
+	default:
+		netdev_info(netdev, "Rx URB aborted (%d)\n",
+			 urb->status);
+		goto resubmit_urb;
+	}
+
+	while (pos < urb->actual_length) {
+		struct usb_8dev_rx_msg *msg;
+
+		if (pos + sizeof(struct usb_8dev_rx_msg) > urb->actual_length) {
+			netdev_err(priv->netdev, "format error\n");
+			break;
+		}
+
+		msg = (struct usb_8dev_rx_msg *)(urb->transfer_buffer + pos);
+		usb_8dev_rx_can_msg(priv, msg);
+
+		pos += sizeof(struct usb_8dev_rx_msg);
+	}
+
+resubmit_urb:
+	usb_fill_bulk_urb(urb, priv->udev,
+			  usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_RX),
+			  urb->transfer_buffer, RX_BUFFER_SIZE,
+			  usb_8dev_read_bulk_callback, priv);
+
+	retval = usb_submit_urb(urb, GFP_ATOMIC);
+
+	if (retval == -ENODEV)
+		netif_device_detach(netdev);
+	else if (retval)
+		netdev_err(netdev,
+			"failed resubmitting read bulk urb: %d\n", retval);
+}
+
+/* Callback handler for write operations
+ *
+ * Free allocated buffers, check transmit status and
+ * calculate statistic.
+ */
+static void usb_8dev_write_bulk_callback(struct urb *urb)
+{
+	struct usb_8dev_tx_urb_context *context = urb->context;
+	struct usb_8dev_priv *priv;
+	struct net_device *netdev;
+
+	BUG_ON(!context);
+
+	priv = context->priv;
+	netdev = priv->netdev;
+
+	/* free up our allocated buffer */
+	usb_free_coherent(urb->dev, urb->transfer_buffer_length,
+			  urb->transfer_buffer, urb->transfer_dma);
+
+	atomic_dec(&priv->active_tx_urbs);
+
+	if (!netif_device_present(netdev))
+		return;
+
+	if (urb->status)
+		netdev_info(netdev, "Tx URB aborted (%d)\n",
+			 urb->status);
+
+	netdev->stats.tx_packets++;
+	netdev->stats.tx_bytes += context->dlc;
+
+	can_get_echo_skb(netdev, context->echo_index);
+
+	can_led_event(netdev, CAN_LED_EVENT_TX);
+
+	/* Release context */
+	context->echo_index = MAX_TX_URBS;
+
+	netif_wake_queue(netdev);
+}
+
+/* Send data to device */
+static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
+				      struct net_device *netdev)
+{
+	struct usb_8dev_priv *priv = netdev_priv(netdev);
+	struct net_device_stats *stats = &netdev->stats;
+	struct can_frame *cf = (struct can_frame *) skb->data;
+	struct usb_8dev_tx_msg *msg;
+	struct urb *urb;
+	struct usb_8dev_tx_urb_context *context = NULL;
+	u8 *buf;
+	int i, err;
+	size_t size = sizeof(struct usb_8dev_tx_msg);
+
+	if (can_dropped_invalid_skb(netdev, skb))
+		return NETDEV_TX_OK;
+
+	/* create a URB, and a buffer for it, and copy the data to the URB */
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!urb) {
+		netdev_err(netdev, "No memory left for URBs\n");
+		goto nomem;
+	}
+
+	buf = usb_alloc_coherent(priv->udev, size, GFP_ATOMIC,
+				 &urb->transfer_dma);
+	if (!buf) {
+		netdev_err(netdev, "No memory left for USB buffer\n");
+		goto nomembuf;
+	}
+
+	memset(buf, 0, size);
+
+	msg = (struct usb_8dev_tx_msg *)buf;
+	msg->begin = USB_8DEV_DATA_START;
+	msg->flags = 0x00;
+
+	if (cf->can_id & CAN_RTR_FLAG)
+		msg->flags |= USB_8DEV_RTR;
+
+	if (cf->can_id & CAN_EFF_FLAG)
+		msg->flags |= USB_8DEV_EXTID;
+
+	msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK);
+	msg->dlc = cf->can_dlc;
+	memcpy(msg->data, cf->data, cf->can_dlc);
+	msg->end = USB_8DEV_DATA_END;
+
+	for (i = 0; i < MAX_TX_URBS; i++) {
+		if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
+			context = &priv->tx_contexts[i];
+			break;
+		}
+	}
+
+	/* May never happen! When this happens we'd more URBs in flight as
+	 * allowed (MAX_TX_URBS).
+	 */
+	if (!context)
+		goto nofreecontext;
+
+	context->priv = priv;
+	context->echo_index = i;
+	context->dlc = cf->can_dlc;
+
+	usb_fill_bulk_urb(urb, priv->udev,
+			  usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_TX),
+			  buf, size, usb_8dev_write_bulk_callback, context);
+	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+	usb_anchor_urb(urb, &priv->tx_submitted);
+
+	can_put_echo_skb(skb, netdev, context->echo_index);
+
+	atomic_inc(&priv->active_tx_urbs);
+
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+	if (unlikely(err))
+		goto failed;
+	else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
+		/* Slow down tx path */
+		netif_stop_queue(netdev);
+
+	/* Release our reference to this URB, the USB core will eventually free
+	 * it entirely.
+	 */
+	usb_free_urb(urb);
+
+	return NETDEV_TX_OK;
+
+nofreecontext:
+	usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
+	usb_free_urb(urb);
+
+	netdev_warn(netdev, "couldn't find free context");
+
+	return NETDEV_TX_BUSY;
+
+failed:
+	can_free_echo_skb(netdev, context->echo_index);
+
+	usb_unanchor_urb(urb);
+	usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
+
+	atomic_dec(&priv->active_tx_urbs);
+
+	if (err == -ENODEV)
+		netif_device_detach(netdev);
+	else
+		netdev_warn(netdev, "failed tx_urb %d\n", err);
+
+nomembuf:
+	usb_free_urb(urb);
+
+nomem:
+	dev_kfree_skb(skb);
+	stats->tx_dropped++;
+
+	return NETDEV_TX_OK;
+}
+
+static int usb_8dev_get_berr_counter(const struct net_device *netdev,
+				     struct can_berr_counter *bec)
+{
+	struct usb_8dev_priv *priv = netdev_priv(netdev);
+
+	bec->txerr = priv->bec.txerr;
+	bec->rxerr = priv->bec.rxerr;
+
+	return 0;
+}
+
+/* Start USB device */
+static int usb_8dev_start(struct usb_8dev_priv *priv)
+{
+	struct net_device *netdev = priv->netdev;
+	int err, i;
+
+	for (i = 0; i < MAX_RX_URBS; i++) {
+		struct urb *urb = NULL;
+		u8 *buf;
+
+		/* create a URB, and a buffer for it */
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!urb) {
+			netdev_err(netdev, "No memory left for URBs\n");
+			err = -ENOMEM;
+			break;
+		}
+
+		buf = usb_alloc_coherent(priv->udev, RX_BUFFER_SIZE, GFP_KERNEL,
+					 &urb->transfer_dma);
+		if (!buf) {
+			netdev_err(netdev, "No memory left for USB buffer\n");
+			usb_free_urb(urb);
+			err = -ENOMEM;
+			break;
+		}
+
+		usb_fill_bulk_urb(urb, priv->udev,
+				  usb_rcvbulkpipe(priv->udev,
+						  USB_8DEV_ENDP_DATA_RX),
+				  buf, RX_BUFFER_SIZE,
+				  usb_8dev_read_bulk_callback, priv);
+		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+		usb_anchor_urb(urb, &priv->rx_submitted);
+
+		err = usb_submit_urb(urb, GFP_KERNEL);
+		if (err) {
+			usb_unanchor_urb(urb);
+			usb_free_coherent(priv->udev, RX_BUFFER_SIZE, buf,
+					  urb->transfer_dma);
+			usb_free_urb(urb);
+			break;
+		}
+
+		/* Drop reference, USB core will take care of freeing it */
+		usb_free_urb(urb);
+	}
+
+	/* Did we submit any URBs */
+	if (i == 0) {
+		netdev_warn(netdev, "couldn't setup read URBs\n");
+		return err;
+	}
+
+	/* Warn if we've couldn't transmit all the URBs */
+	if (i < MAX_RX_URBS)
+		netdev_warn(netdev, "rx performance may be slow\n");
+
+	err = usb_8dev_cmd_open(priv);
+	if (err)
+		goto failed;
+
+	priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+	return 0;
+
+failed:
+	if (err == -ENODEV)
+		netif_device_detach(priv->netdev);
+
+	netdev_warn(netdev, "couldn't submit control: %d\n", err);
+
+	return err;
+}
+
+/* Open USB device */
+static int usb_8dev_open(struct net_device *netdev)
+{
+	struct usb_8dev_priv *priv = netdev_priv(netdev);
+	int err;
+
+	/* common open */
+	err = open_candev(netdev);
+	if (err)
+		return err;
+
+	can_led_event(netdev, CAN_LED_EVENT_OPEN);
+
+	/* finally start device */
+	err = usb_8dev_start(priv);
+	if (err) {
+		if (err == -ENODEV)
+			netif_device_detach(priv->netdev);
+
+		netdev_warn(netdev, "couldn't start device: %d\n",
+			 err);
+
+		close_candev(netdev);
+
+		return err;
+	}
+
+	netif_start_queue(netdev);
+
+	return 0;
+}
+
+static void unlink_all_urbs(struct usb_8dev_priv *priv)
+{
+	int i;
+
+	usb_kill_anchored_urbs(&priv->rx_submitted);
+
+	usb_kill_anchored_urbs(&priv->tx_submitted);
+	atomic_set(&priv->active_tx_urbs, 0);
+
+	for (i = 0; i < MAX_TX_URBS; i++)
+		priv->tx_contexts[i].echo_index = MAX_TX_URBS;
+}
+
+/* Close USB device */
+static int usb_8dev_close(struct net_device *netdev)
+{
+	struct usb_8dev_priv *priv = netdev_priv(netdev);
+	int err = 0;
+
+	/* Send CLOSE command to CAN controller */
+	err = usb_8dev_cmd_close(priv);
+	if (err)
+		netdev_warn(netdev, "couldn't stop device");
+
+	priv->can.state = CAN_STATE_STOPPED;
+
+	netif_stop_queue(netdev);
+
+	/* Stop polling */
+	unlink_all_urbs(priv);
+
+	close_candev(netdev);
+
+	can_led_event(netdev, CAN_LED_EVENT_STOP);
+
+	return err;
+}
+
+static const struct net_device_ops usb_8dev_netdev_ops = {
+	.ndo_open = usb_8dev_open,
+	.ndo_stop = usb_8dev_close,
+	.ndo_start_xmit = usb_8dev_start_xmit,
+	.ndo_change_mtu = can_change_mtu,
+};
+
+static const struct can_bittiming_const usb_8dev_bittiming_const = {
+	.name = "usb_8dev",
+	.tseg1_min = 1,
+	.tseg1_max = 16,
+	.tseg2_min = 1,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
+/* Probe USB device
+ *
+ * Check device and firmware.
+ * Set supported modes and bittiming constants.
+ * Allocate some memory.
+ */
+static int usb_8dev_probe(struct usb_interface *intf,
+			 const struct usb_device_id *id)
+{
+	struct net_device *netdev;
+	struct usb_8dev_priv *priv;
+	int i, err = -ENOMEM;
+	u32 version;
+	char buf[18];
+	struct usb_device *usbdev = interface_to_usbdev(intf);
+
+	/* product id looks strange, better we also check iProduct string */
+	if (usb_string(usbdev, usbdev->descriptor.iProduct, buf,
+		       sizeof(buf)) > 0 && strcmp(buf, "USB2CAN converter")) {
+		dev_info(&usbdev->dev, "ignoring: not an USB2CAN converter\n");
+		return -ENODEV;
+	}
+
+	netdev = alloc_candev(sizeof(struct usb_8dev_priv), MAX_TX_URBS);
+	if (!netdev) {
+		dev_err(&intf->dev, "Couldn't alloc candev\n");
+		return -ENOMEM;
+	}
+
+	priv = netdev_priv(netdev);
+
+	priv->udev = usbdev;
+	priv->netdev = netdev;
+
+	priv->can.state = CAN_STATE_STOPPED;
+	priv->can.clock.freq = USB_8DEV_ABP_CLOCK;
+	priv->can.bittiming_const = &usb_8dev_bittiming_const;
+	priv->can.do_set_mode = usb_8dev_set_mode;
+	priv->can.do_get_berr_counter = usb_8dev_get_berr_counter;
+	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
+				      CAN_CTRLMODE_LISTENONLY |
+				      CAN_CTRLMODE_ONE_SHOT;
+
+	netdev->netdev_ops = &usb_8dev_netdev_ops;
+
+	netdev->flags |= IFF_ECHO; /* we support local echo */
+
+	init_usb_anchor(&priv->rx_submitted);
+
+	init_usb_anchor(&priv->tx_submitted);
+	atomic_set(&priv->active_tx_urbs, 0);
+
+	for (i = 0; i < MAX_TX_URBS; i++)
+		priv->tx_contexts[i].echo_index = MAX_TX_URBS;
+
+	priv->cmd_msg_buffer = kzalloc(sizeof(struct usb_8dev_cmd_msg),
+				      GFP_KERNEL);
+	if (!priv->cmd_msg_buffer)
+		goto cleanup_candev;
+
+	usb_set_intfdata(intf, priv);
+
+	SET_NETDEV_DEV(netdev, &intf->dev);
+
+	mutex_init(&priv->usb_8dev_cmd_lock);
+
+	err = register_candev(netdev);
+	if (err) {
+		netdev_err(netdev,
+			"couldn't register CAN device: %d\n", err);
+		goto cleanup_cmd_msg_buffer;
+	}
+
+	err = usb_8dev_cmd_version(priv, &version);
+	if (err) {
+		netdev_err(netdev, "can't get firmware version\n");
+		goto cleanup_unregister_candev;
+	} else {
+		netdev_info(netdev,
+			 "firmware: %d.%d, hardware: %d.%d\n",
+			 (version>>24) & 0xff, (version>>16) & 0xff,
+			 (version>>8) & 0xff, version & 0xff);
+	}
+
+	devm_can_led_init(netdev);
+
+	return 0;
+
+cleanup_unregister_candev:
+	unregister_netdev(priv->netdev);
+
+cleanup_cmd_msg_buffer:
+	kfree(priv->cmd_msg_buffer);
+
+cleanup_candev:
+	free_candev(netdev);
+
+	return err;
+
+}
+
+/* Called by the usb core when driver is unloaded or device is removed */
+static void usb_8dev_disconnect(struct usb_interface *intf)
+{
+	struct usb_8dev_priv *priv = usb_get_intfdata(intf);
+
+	usb_set_intfdata(intf, NULL);
+
+	if (priv) {
+		netdev_info(priv->netdev, "device disconnected\n");
+
+		unregister_netdev(priv->netdev);
+		free_candev(priv->netdev);
+
+		unlink_all_urbs(priv);
+	}
+
+}
+
+static struct usb_driver usb_8dev_driver = {
+	.name =		"usb_8dev",
+	.probe =	usb_8dev_probe,
+	.disconnect =	usb_8dev_disconnect,
+	.id_table =	usb_8dev_table,
+};
+
+module_usb_driver(usb_8dev_driver);
+
+MODULE_AUTHOR("Bernd Krumboeck <krumboeck@universalnet.at>");
+MODULE_DESCRIPTION("CAN driver for 8 devices USB2CAN interfaces");
+MODULE_LICENSE("GPL v2");