Quelle  kvaser_usb_core.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/* 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)
 *  - Kvaser linux mhydra driver (version 5.24)
 *
 * Copyright (C) 2002-2018 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/completion.h>
#include <linux/device.h>
#include <linux/ethtool.h>
#include <linux/gfp.h>
#include <linux/if.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/usb.h>

#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/error.h>
#include <linux/can/netlink.h>

#include "kvaser_usb.h"

/* Kvaser USB vendor id. */
#define KVASER_VENDOR_ID 0x0bfd

/* Kvaser Leaf USB devices product ids */
#define USB_LEAF_DEVEL_PRODUCT_ID 0x000a
#define USB_LEAF_LITE_PRODUCT_ID 0x000b
#define USB_LEAF_PRO_PRODUCT_ID 0x000c
#define USB_LEAF_SPRO_PRODUCT_ID 0x000e
#define USB_LEAF_PRO_LS_PRODUCT_ID 0x000f
#define USB_LEAF_PRO_SWC_PRODUCT_ID 0x0010
#define USB_LEAF_PRO_LIN_PRODUCT_ID 0x0011
#define USB_LEAF_SPRO_LS_PRODUCT_ID 0x0012
#define USB_LEAF_SPRO_SWC_PRODUCT_ID 0x0013
#define USB_MEMO2_DEVEL_PRODUCT_ID 0x0016
#define USB_MEMO2_HSHS_PRODUCT_ID 0x0017
#define USB_UPRO_HSHS_PRODUCT_ID 0x0018
#define USB_LEAF_LITE_GI_PRODUCT_ID 0x0019
#define USB_LEAF_PRO_OBDII_PRODUCT_ID 0x001a
#define USB_MEMO2_HSLS_PRODUCT_ID 0x001b
#define USB_LEAF_LITE_CH_PRODUCT_ID 0x001c
#define USB_BLACKBIRD_SPRO_PRODUCT_ID 0x001d
#define USB_OEM_MERCURY_PRODUCT_ID 0x0022
#define USB_OEM_LEAF_PRODUCT_ID 0x0023
#define USB_CAN_R_PRODUCT_ID 0x0027
#define USB_LEAF_LITE_V2_PRODUCT_ID 0x0120
#define USB_MINI_PCIE_HS_PRODUCT_ID 0x0121
#define USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID 0x0122
#define USB_USBCAN_LIGHT_2HS_PRODUCT_ID 0x0123
#define USB_MINI_PCIE_2HS_PRODUCT_ID 0x0124
#define USB_USBCAN_R_V2_PRODUCT_ID 0x0126
#define USB_LEAF_LIGHT_R_V2_PRODUCT_ID 0x0127
#define USB_LEAF_LIGHT_HS_V2_OEM2_PRODUCT_ID 0x0128

/* Kvaser USBCan-II devices product ids */
#define USB_USBCAN_REVB_PRODUCT_ID 0x0002
#define USB_VCI2_PRODUCT_ID 0x0003
#define USB_USBCAN2_PRODUCT_ID 0x0004
#define USB_MEMORATOR_PRODUCT_ID 0x0005

/* Kvaser Minihydra USB devices product ids */
#define USB_BLACKBIRD_V2_PRODUCT_ID 0x0102
#define USB_MEMO_PRO_5HS_PRODUCT_ID 0x0104
#define USB_USBCAN_PRO_5HS_PRODUCT_ID 0x0105
#define USB_USBCAN_LIGHT_4HS_PRODUCT_ID 0x0106
#define USB_LEAF_PRO_HS_V2_PRODUCT_ID 0x0107
#define USB_USBCAN_PRO_2HS_V2_PRODUCT_ID 0x0108
#define USB_MEMO_2HS_PRODUCT_ID 0x0109
#define USB_MEMO_PRO_2HS_V2_PRODUCT_ID 0x010a
#define USB_HYBRID_2CANLIN_PRODUCT_ID 0x010b
#define USB_ATI_USBCAN_PRO_2HS_V2_PRODUCT_ID 0x010c
#define USB_ATI_MEMO_PRO_2HS_V2_PRODUCT_ID 0x010d
#define USB_HYBRID_PRO_2CANLIN_PRODUCT_ID 0x010e
#define USB_U100_PRODUCT_ID 0x0111
#define USB_U100P_PRODUCT_ID 0x0112
#define USB_U100S_PRODUCT_ID 0x0113
#define USB_USBCAN_PRO_4HS_PRODUCT_ID 0x0114
#define USB_HYBRID_CANLIN_PRODUCT_ID 0x0115
#define USB_HYBRID_PRO_CANLIN_PRODUCT_ID 0x0116
#define USB_LEAF_V3_PRODUCT_ID 0x0117
#define USB_VINING_800_PRODUCT_ID 0x0119
#define USB_USBCAN_PRO_5XCAN_PRODUCT_ID 0x011A
#define USB_MINI_PCIE_1XCAN_PRODUCT_ID 0x011B

static const struct kvaser_usb_driver_info kvaser_usb_driver_info_hydra = {
 .quirks = 0,
 .ops = &kvaser_usb_hydra_dev_ops,
};

static const struct kvaser_usb_driver_info kvaser_usb_driver_info_usbcan = {
 .quirks = KVASER_USB_QUIRK_HAS_TXRX_ERRORS |
    KVASER_USB_QUIRK_HAS_SILENT_MODE,
 .family = KVASER_USBCAN,
 .ops = &kvaser_usb_leaf_dev_ops,
};

static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leaf = {
 .quirks = KVASER_USB_QUIRK_IGNORE_CLK_FREQ,
 .family = KVASER_LEAF,
 .ops = &kvaser_usb_leaf_dev_ops,
};

static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leaf_err = {
 .quirks = KVASER_USB_QUIRK_HAS_TXRX_ERRORS |
    KVASER_USB_QUIRK_IGNORE_CLK_FREQ,
 .family = KVASER_LEAF,
 .ops = &kvaser_usb_leaf_dev_ops,
};

static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leaf_err_listen = {
 .quirks = KVASER_USB_QUIRK_HAS_TXRX_ERRORS |
    KVASER_USB_QUIRK_HAS_SILENT_MODE |
    KVASER_USB_QUIRK_IGNORE_CLK_FREQ,
 .family = KVASER_LEAF,
 .ops = &kvaser_usb_leaf_dev_ops,
};

static const struct kvaser_usb_driver_info kvaser_usb_driver_info_leafimx = {
 .quirks = 0,
 .family = KVASER_LEAF,
 .ops = &kvaser_usb_leaf_dev_ops,
};

static const struct usb_device_id kvaser_usb_table[] = {
 /* Leaf M32C USB product IDs */
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err_listen },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leaf_err },

 /* Leaf i.MX28 USB product IDs */
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_R_V2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_R_V2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_leafimx },

 /* USBCANII USB product IDs */
 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_usbcan },

 /* Minihydra USB product IDs */
 { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_V2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_5HS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_5HS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_4HS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_HS_V2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_2HS_V2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_2HS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_2HS_V2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_2CANLIN_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_USBCAN_PRO_2HS_V2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_MEMO_PRO_2HS_V2_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_PRO_2CANLIN_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_U100_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_U100P_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_U100S_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_4HS_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_CANLIN_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_PRO_CANLIN_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_V3_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_VINING_800_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_5XCAN_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_1XCAN_PRODUCT_ID),
  .driver_info = (kernel_ulong_t)&kvaser_usb_driver_info_hydra },
 { }
};
MODULE_DEVICE_TABLE(usb, kvaser_usb_table);

int kvaser_usb_send_cmd(const struct kvaser_usb *dev, void *cmd, int len)
{
 return usb_bulk_msg(dev->udev,
       usb_sndbulkpipe(dev->udev,
         dev->bulk_out->bEndpointAddress),
       cmd, len, NULL, KVASER_USB_TIMEOUT);
}

int kvaser_usb_recv_cmd(const struct kvaser_usb *dev, void *cmd, int len,
   int *actual_len)
{
 return usb_bulk_msg(dev->udev,
       usb_rcvbulkpipe(dev->udev,
         dev->bulk_in->bEndpointAddress),
       cmd, len, actual_len, KVASER_USB_TIMEOUT);
}

static void kvaser_usb_send_cmd_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);
}

int kvaser_usb_send_cmd_async(struct kvaser_usb_net_priv *priv, void *cmd,
         int len)
{
 struct kvaser_usb *dev = priv->dev;
 struct net_device *netdev = priv->netdev;
 struct urb *urb;
 int err;

 urb = usb_alloc_urb(0, GFP_ATOMIC);
 if (!urb)
  return -ENOMEM;

 usb_fill_bulk_urb(urb, dev->udev,
     usb_sndbulkpipe(dev->udev,
       dev->bulk_out->bEndpointAddress),
     cmd, len, kvaser_usb_send_cmd_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;
}

int kvaser_usb_can_rx_over_error(struct net_device *netdev)
{
 struct net_device_stats *stats = &netdev->stats;
 struct can_frame *cf;
 struct sk_buff *skb;

 stats->rx_over_errors++;
 stats->rx_errors++;

 skb = alloc_can_err_skb(netdev, &cf);
 if (!skb) {
  stats->rx_dropped++;
  netdev_warn(netdev, "No memory left for err_skb\n");
  return -ENOMEM;
 }

 cf->can_id |= CAN_ERR_CRTL;
 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;

 netif_rx(skb);

 return 0;
}

static void kvaser_usb_read_bulk_callback(struct urb *urb)
{
 struct kvaser_usb *dev = urb->context;
 const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 int err;
 unsigned int i;

 switch (urb->status) {
 case 0:
  break;
 case -ENOENT:
 case -EPIPE:
 case -EPROTO:
 case -ESHUTDOWN:
  return;
 default:
  dev_info(&dev->intf->dev, "Rx URB aborted (%d)\n", urb->status);
  goto resubmit_urb;
 }

 ops->dev_read_bulk_callback(dev, urb->transfer_buffer,
        urb->actual_length);

resubmit_urb:
 usb_fill_bulk_urb(urb, dev->udev,
     usb_rcvbulkpipe(dev->udev,
       dev->bulk_in->bEndpointAddress),
     urb->transfer_buffer, KVASER_USB_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++) {
   struct kvaser_usb_net_priv *priv;

   priv = dev->nets[i];
   if (!priv)
    continue;

   netif_device_detach(priv->netdev);
  }
 } else if (err) {
  dev_err(&dev->intf->dev,
   "Failed resubmitting read bulk urb: %d\n", err);
 }
}

static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
{
 int i, err = 0;

 if (dev->rxinitdone)
  return 0;

 for (i = 0; i < KVASER_USB_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) {
   err = -ENOMEM;
   break;
  }

  buf = usb_alloc_coherent(dev->udev, KVASER_USB_RX_BUFFER_SIZE,
      GFP_KERNEL, &buf_dma);
  if (!buf) {
   dev_warn(&dev->intf->dev,
     "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, KVASER_USB_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,
       KVASER_USB_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->intf->dev, "Cannot setup read URBs, error %d\n",
    err);
  return err;
 } else if (i < KVASER_USB_MAX_RX_URBS) {
  dev_warn(&dev->intf->dev, "RX performances may be slow\n");
 }

 dev->rxinitdone = true;

 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;
 const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 int err;

 err = open_candev(netdev);
 if (err)
  return err;

 err = ops->dev_set_opt_mode(priv);
 if (err)
  goto error;

 err = ops->dev_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.
 */
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 < KVASER_USB_MAX_RX_URBS; i++)
  usb_free_coherent(dev->udev, KVASER_USB_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_close(struct net_device *netdev)
{
 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 struct kvaser_usb *dev = priv->dev;
 const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 int err;

 netif_stop_queue(netdev);

 err = ops->dev_flush_queue(priv);
 if (err)
  netdev_warn(netdev, "Cannot flush queue, error %d\n", err);

 if (ops->dev_reset_chip) {
  err = ops->dev_reset_chip(dev, priv->channel);
  if (err)
   netdev_warn(netdev, "Cannot reset card, error %d\n",
        err);
 }

 err = ops->dev_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 int kvaser_usb_set_bittiming(struct net_device *netdev)
{
 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 struct kvaser_usb *dev = priv->dev;
 const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 struct can_bittiming *bt = &priv->can.bittiming;
 struct kvaser_usb_busparams busparams;
 int tseg1 = bt->prop_seg + bt->phase_seg1;
 int tseg2 = bt->phase_seg2;
 int sjw = bt->sjw;
 int err;

 busparams.bitrate = cpu_to_le32(bt->bitrate);
 busparams.sjw = (u8)sjw;
 busparams.tseg1 = (u8)tseg1;
 busparams.tseg2 = (u8)tseg2;
 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
  busparams.nsamples = 3;
 else
  busparams.nsamples = 1;

 err = ops->dev_set_bittiming(netdev, &busparams);
 if (err)
  return err;

 err = kvaser_usb_setup_rx_urbs(priv->dev);
 if (err)
  return err;

 err = ops->dev_get_busparams(priv);
 if (err) {
  /* Treat EOPNOTSUPP as success */
  if (err == -EOPNOTSUPP)
   err = 0;
  return err;
 }

 if (memcmp(&busparams, &priv->busparams_nominal,
     sizeof(priv->busparams_nominal)) != 0)
  err = -EINVAL;

 return err;
}

static int kvaser_usb_set_data_bittiming(struct net_device *netdev)
{
 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 struct kvaser_usb *dev = priv->dev;
 const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 struct can_bittiming *dbt = &priv->can.fd.data_bittiming;
 struct kvaser_usb_busparams busparams;
 int tseg1 = dbt->prop_seg + dbt->phase_seg1;
 int tseg2 = dbt->phase_seg2;
 int sjw = dbt->sjw;
 int err;

 if (!ops->dev_set_data_bittiming ||
     !ops->dev_get_data_busparams)
  return -EOPNOTSUPP;

 busparams.bitrate = cpu_to_le32(dbt->bitrate);
 busparams.sjw = (u8)sjw;
 busparams.tseg1 = (u8)tseg1;
 busparams.tseg2 = (u8)tseg2;
 busparams.nsamples = 1;

 err = ops->dev_set_data_bittiming(netdev, &busparams);
 if (err)
  return err;

 err = kvaser_usb_setup_rx_urbs(priv->dev);
 if (err)
  return err;

 err = ops->dev_get_data_busparams(priv);
 if (err)
  return err;

 if (memcmp(&busparams, &priv->busparams_data,
     sizeof(priv->busparams_data)) != 0)
  err = -EINVAL;

 return err;
}

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;
 const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 struct net_device_stats *stats = &netdev->stats;
 struct kvaser_usb_tx_urb_context *context = NULL;
 struct urb *urb;
 void *buf;
 int cmd_len = 0;
 int err, ret = NETDEV_TX_OK;
 unsigned int i;
 unsigned long flags;

 if (can_dev_dropped_skb(netdev, skb))
  return NETDEV_TX_OK;

 urb = usb_alloc_urb(0, GFP_ATOMIC);
 if (!urb) {
  stats->tx_dropped++;
  dev_kfree_skb(skb);
  return NETDEV_TX_OK;
 }

 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;
   ++priv->active_tx_contexts;
   if (priv->active_tx_contexts >= (int)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");

  ret = NETDEV_TX_BUSY;
  goto freeurb;
 }

 buf = ops->dev_frame_to_cmd(priv, skb, &cmd_len, context->echo_index);
 if (!buf) {
  stats->tx_dropped++;
  dev_kfree_skb(skb);
  spin_lock_irqsave(&priv->tx_contexts_lock, flags);

  context->echo_index = dev->max_tx_urbs;
  --priv->active_tx_contexts;
  netif_wake_queue(netdev);

  spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
  goto freeurb;
 }

 context->priv = priv;

 can_put_echo_skb(skb, netdev, context->echo_index, 0);

 usb_fill_bulk_urb(urb, dev->udev,
     usb_sndbulkpipe(dev->udev,
       dev->bulk_out->bEndpointAddress),
     buf, cmd_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, NULL);
  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);
  kfree(buf);

  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 int kvaser_usb_set_phys_id(struct net_device *netdev,
      enum ethtool_phys_id_state state)
{
 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
 const struct kvaser_usb_dev_ops *ops = priv->dev->driver_info->ops;

 switch (state) {
 case ETHTOOL_ID_ACTIVE:
  return 3; /* 3 On/Off cycles per second */

 case ETHTOOL_ID_ON:
  return ops->dev_set_led(priv, KVASER_USB_LED_ON, 1000);

 case ETHTOOL_ID_OFF:
  return ops->dev_set_led(priv, KVASER_USB_LED_OFF, 1000);

 case ETHTOOL_ID_INACTIVE:
  /* Turn LED off and restore standard function after 1ms */
  return ops->dev_set_led(priv, KVASER_USB_LED_OFF, 1);

 default:
  return -EINVAL;
 }
}

static const struct net_device_ops kvaser_usb_netdev_ops = {
 .ndo_open = kvaser_usb_open,
 .ndo_stop = kvaser_usb_close,
 .ndo_eth_ioctl = can_eth_ioctl_hwts,
 .ndo_start_xmit = kvaser_usb_start_xmit,
 .ndo_change_mtu = can_change_mtu,
};

static const struct ethtool_ops kvaser_usb_ethtool_ops = {
 .get_ts_info = can_ethtool_op_get_ts_info_hwts,
 .set_phys_id = kvaser_usb_set_phys_id,
};

static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
{
 const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 int i;
 struct kvaser_usb_net_priv *priv;

 for (i = 0; i < dev->nchannels; i++) {
  priv = dev->nets[i];
  if (!priv)
   continue;

  unregister_candev(priv->netdev);
 }

 kvaser_usb_unlink_all_urbs(dev);

 for (i = 0; i < dev->nchannels; i++) {
  priv = dev->nets[i];
  if (!priv)
   continue;

  if (ops->dev_remove_channel)
   ops->dev_remove_channel(priv);

  kvaser_usb_devlink_port_unregister(priv);
  free_candev(priv->netdev);
 }
}

static int kvaser_usb_init_one(struct kvaser_usb *dev, int channel)
{
 struct net_device *netdev;
 struct kvaser_usb_net_priv *priv;
 const struct kvaser_usb_driver_info *driver_info = dev->driver_info;
 const struct kvaser_usb_dev_ops *ops = driver_info->ops;
 int err;

 if (ops->dev_reset_chip) {
  err = ops->dev_reset_chip(dev, channel);
  if (err)
   return err;
 }

 netdev = alloc_candev(struct_size(priv, tx_contexts, dev->max_tx_urbs),
         dev->max_tx_urbs);
 if (!netdev) {
  dev_err(&dev->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);
 init_completion(&priv->flush_comp);
 init_completion(&priv->get_busparams_comp);
 priv->can.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC |
           CAN_CTRLMODE_BERR_REPORTING;

 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 = dev->cfg->clock.freq;
 priv->can.bittiming_const = dev->cfg->bittiming_const;
 priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
 priv->can.do_set_mode = ops->dev_set_mode;
 if ((driver_info->quirks & KVASER_USB_QUIRK_HAS_TXRX_ERRORS) ||
     (priv->dev->card_data.capabilities & KVASER_USB_CAP_BERR_CAP))
  priv->can.do_get_berr_counter = ops->dev_get_berr_counter;
 if (driver_info->quirks & KVASER_USB_QUIRK_HAS_SILENT_MODE)
  priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;

 priv->can.ctrlmode_supported |= dev->card_data.ctrlmode_supported;

 if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD) {
  priv->can.fd.data_bittiming_const = dev->cfg->data_bittiming_const;
  priv->can.fd.do_set_data_bittiming = kvaser_usb_set_data_bittiming;
 }

 netdev->flags |= IFF_ECHO;

 netdev->netdev_ops = &kvaser_usb_netdev_ops;
 netdev->ethtool_ops = &kvaser_usb_ethtool_ops;
 SET_NETDEV_DEV(netdev, &dev->intf->dev);
 netdev->dev_id = channel;
 netdev->dev_port = channel;

 dev->nets[channel] = priv;

 if (ops->dev_init_channel) {
  err = ops->dev_init_channel(priv);
  if (err)
   goto candev_free;
 }

 err = kvaser_usb_devlink_port_register(priv);
 if (err) {
  dev_err(&dev->intf->dev, "Failed to register devlink port\n");
  goto candev_free;
 }

 err = register_candev(netdev);
 if (err) {
  dev_err(&dev->intf->dev, "Failed to register CAN device\n");
  goto unregister_devlink_port;
 }

 netdev_dbg(netdev, "device registered\n");

 return 0;

unregister_devlink_port:
 kvaser_usb_devlink_port_unregister(priv);
candev_free:
 free_candev(netdev);
 dev->nets[channel] = NULL;
 return err;
}

static int kvaser_usb_probe(struct usb_interface *intf,
       const struct usb_device_id *id)
{
 struct kvaser_usb *dev;
 struct devlink *devlink;
 int err;
 int i;
 const struct kvaser_usb_driver_info *driver_info;
 const struct kvaser_usb_dev_ops *ops;

 driver_info = (const struct kvaser_usb_driver_info *)id->driver_info;
 if (!driver_info)
  return -ENODEV;

 devlink = devlink_alloc(&kvaser_usb_devlink_ops, sizeof(*dev), &intf->dev);
 if (!devlink)
  return -ENOMEM;

 dev = devlink_priv(devlink);
 dev->intf = intf;
 dev->driver_info = driver_info;
 ops = driver_info->ops;

 err = ops->dev_setup_endpoints(dev);
 if (err) {
  dev_err_probe(&intf->dev, err, "Cannot get usb endpoint(s)");
  goto free_devlink;
 }

 dev->udev = interface_to_usbdev(intf);

 init_usb_anchor(&dev->rx_submitted);

 usb_set_intfdata(intf, dev);

 dev->card_data.ctrlmode_supported = 0;
 dev->card_data.capabilities = 0;
 err = ops->dev_init_card(dev);
 if (err) {
  dev_err_probe(&intf->dev, err,
         "Failed to initialize card\n");
  goto free_devlink;
 }

 err = ops->dev_get_software_info(dev);
 if (err) {
  dev_err_probe(&intf->dev, err,
         "Cannot get software info\n");
  goto free_devlink;
 }

 if (ops->dev_get_software_details) {
  err = ops->dev_get_software_details(dev);
  if (err) {
   dev_err_probe(&intf->dev, err,
          "Cannot get software details\n");
   goto free_devlink;
  }
 }

 if (WARN_ON(!dev->cfg)) {
  err = -ENODEV;
  goto free_devlink;
 }

 dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs);

 err = ops->dev_get_card_info(dev);
 if (err) {
  dev_err_probe(&intf->dev, err,
         "Cannot get card info\n");
  goto free_devlink;
 }

 if (ops->dev_get_capabilities) {
  err = ops->dev_get_capabilities(dev);
  if (err) {
   dev_err_probe(&intf->dev, err,
          "Cannot get capabilities\n");
   goto remove_interfaces;
  }
 }

 for (i = 0; i < dev->nchannels; i++) {
  err = kvaser_usb_init_one(dev, i);
  if (err)
   goto remove_interfaces;
 }
 devlink_register(devlink);

 return 0;

remove_interfaces:
 kvaser_usb_remove_interfaces(dev);
free_devlink:
 devlink_free(devlink);

 return err;
}

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);
 devlink_unregister(priv_to_devlink(dev));
 devlink_free(priv_to_devlink(dev));
}

static struct usb_driver kvaser_usb_driver = {
 .name = KBUILD_MODNAME,
 .probe = kvaser_usb_probe,
 .disconnect = kvaser_usb_disconnect,
 .id_table = kvaser_usb_table,
};

module_usb_driver(kvaser_usb_driver);

MODULE_AUTHOR("Olivier Sobrie ");
MODULE_AUTHOR("Kvaser AB ");
MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
MODULE_LICENSE("GPL v2");