Fixed MTP to work with TWRP

drivers/net/can/usb/Kconfig

@@ -0,0 +1,67 @@
+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.
+
+	  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
+
+	  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"
+	---help---
+	  This driver supports the PCAN-USB and PCAN-USB Pro adapters
+	  from PEAK-System Technik (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

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

drivers/net/can/usb/gs_usb.c

@@ -0,0 +1,972 @@
+/* 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);
+	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");

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

drivers/net/can/usb/peak_usb/pcan_usb.c

@@ -0,0 +1,903 @@
+/*
+ * 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) {
+		u32 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)
+{
+	u16 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) {
+		u16 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;
+		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) {
+		u32 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 {
+		u16 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
+ */
+struct peak_usb_adapter pcan_usb = {
+	.name = "PCAN-USB",
+	.device_id = PCAN_USB_PRODUCT_ID,
+	.ctrl_count = 1,
+	.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,
+};

drivers/net/can/usb/peak_usb/pcan_usb_core.c

@@ -0,0 +1,953 @@
+/*
+ * 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)},
+	{} /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, peak_usb_table);
+
+/* List of supported PCAN-USB adapters (NULL terminated list) */
+static struct peak_usb_adapter *peak_usb_adapters_list[] = {
+	&pcan_usb,
+	&pcan_usb_pro,
+	NULL,
+};
+
+/*
+ * 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,
+			    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());
+	}
+}
+
+/*
+ * 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->dlc;
+
+		/* 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 can_frame *cf = (struct can_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;
+	context->dlc = cf->can_dlc;
+
+	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 bitrate.
+ */
+static int peak_usb_set_bittiming(struct net_device *netdev)
+{
+	struct peak_usb_device *dev = netdev_priv(netdev);
+	struct can_bittiming *bt = &dev->can.bittiming;
+
+	if (dev->adapter->dev_set_bittiming) {
+		int err = dev->adapter->dev_set_bittiming(dev, bt);
+
+		if (err)
+			netdev_info(netdev, "couldn't set 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(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.do_set_mode = peak_usb_set_mode;
+	dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
+				      CAN_CTRLMODE_LISTENONLY;
+
+	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);
+	struct peak_usb_adapter *peak_usb_adapter, **pp;
+	int i, err = -ENOMEM;
+
+	usb_dev = interface_to_usbdev(intf);
+
+	/* get corresponding PCAN-USB adapter */
+	for (pp = peak_usb_adapters_list; *pp; pp++)
+		if ((*pp)->device_id == usb_dev->descriptor.idProduct)
+			break;
+
+	peak_usb_adapter = *pp;
+	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);

drivers/net/can/usb/peak_usb/pcan_usb_core.h

@@ -0,0 +1,145 @@
+/*
+ * 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_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;
+	struct can_clock clock;
+	const struct can_bittiming_const 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_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);
+	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 struct peak_usb_adapter pcan_usb;
+extern struct peak_usb_adapter pcan_usb_pro;
+
+struct peak_time_ref {
+	struct timeval tv_host_0, tv_host;
+	u32 ts_dev_1, ts_dev_2;
+	u64 ts_total;
+	u32 tick_count;
+	struct peak_usb_adapter *adapter;
+};
+
+struct peak_tx_urb_context {
+	struct peak_usb_device *dev;
+	u32 echo_index;
+	u8 dlc;
+	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;
+	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,
+			    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);
+
+void peak_usb_async_complete(struct urb *urb);
+void peak_usb_restart_complete(struct peak_usb_device *dev);
+#endif

drivers/net/can/usb/peak_usb/pcan_usb_pro.h

@@ -0,0 +1,179 @@
+/*
+ * 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
+
+/* 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 {
+	u32 ctrl_type;
+	u8  version[4];
+	u8  day;
+	u8  month;
+	u8  year;
+	u8  dummy;
+	u32 serial_num_hi;
+	u32 serial_num_lo;
+	u32 hw_type;
+	u32 hw_rev;
+};
+
+/* PCAN_USBPRO_INFO_FW vendor request record type */
+struct __packed pcan_usb_pro_fwinfo {
+	u32 ctrl_type;
+	u8  version[4];
+	u8  day;
+	u8  month;
+	u8  year;
+	u8  dummy;
+	u32 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;
+	u16 dummy;
+	u32 CCBT;
+};
+
+struct __packed pcan_usb_pro_busact {
+	u8  data_type;
+	u8  channel;
+	u16 onoff;
+};
+
+struct __packed pcan_usb_pro_silent {
+	u8  data_type;
+	u8  channel;
+	u16 onoff;
+};
+
+struct __packed pcan_usb_pro_filter {
+	u8  data_type;
+	u8  dummy;
+	u16 filter_mode;
+};
+
+struct __packed pcan_usb_pro_setts {
+	u8  data_type;
+	u8  dummy;
+	u16 mode;
+};
+
+struct __packed pcan_usb_pro_devid {
+	u8  data_type;
+	u8  channel;
+	u16 dummy;
+	u32 serial_num;
+};
+
+struct __packed pcan_usb_pro_setled {
+	u8  data_type;
+	u8  channel;
+	u16 mode;
+	u32 timeout;
+};
+
+struct __packed pcan_usb_pro_rxmsg {
+	u8  data_type;
+	u8  client;
+	u8  flags;
+	u8  len;
+	u32 ts32;
+	u32 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;
+	u16 status;
+	u32 ts32;
+	u32 err_frm;
+};
+
+struct __packed pcan_usb_pro_rxts {
+	u8  data_type;
+	u8  dummy[3];
+	u32 ts64[2];
+};
+
+struct __packed pcan_usb_pro_txmsg {
+	u8  data_type;
+	u8  client;
+	u8  flags;
+	u8  len;
+	u32 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;
+};
+
+#endif