This driver can also be built as a module. If so, the module
will be called vxcan.
-config CAN_SLCAN
- tristate "Serial / USB serial CAN Adaptors (slcan)"
- depends on TTY
- help
- CAN driver for several 'low cost' CAN interfaces that are attached
- via serial lines or via USB-to-serial adapters using the LAWICEL
- ASCII protocol. The driver implements the tty linediscipline N_SLCAN.
-
- As only the sending and receiving of CAN frames is implemented, this
- driver should work with the (serial/USB) CAN hardware from:
- www.canusb.com / www.can232.com / www.mictronics.de / www.canhack.de
-
- Userspace tools to attach the SLCAN line discipline (slcan_attach,
- slcand) can be found in the can-utils at the linux-can project, see
- https://github.com/linux-can/can-utils for details.
-
- The slcan driver supports up to 10 CAN netdevices by default which
- can be changed by the 'maxdev=xx' module option. This driver can
- also be built as a module. If so, the module will be called slcan.
-
config CAN_NETLINK
bool "CAN device drivers with Netlink support"
default y
Kvaser Mini PCI Express HS v2
Kvaser Mini PCI Express 2xHS v2
+config CAN_SLCAN
+ tristate "Serial / USB serial CAN Adaptors (slcan)"
+ depends on TTY
+ help
+ CAN driver for several 'low cost' CAN interfaces that are attached
+ via serial lines or via USB-to-serial adapters using the LAWICEL
+ ASCII protocol. The driver implements the tty linediscipline N_SLCAN.
+
+ As only the sending and receiving of CAN frames is implemented, this
+ driver should work with the (serial/USB) CAN hardware from:
+ www.canusb.com / www.can232.com / www.mictronics.de / www.canhack.de
+
+ Userspace tools to attach the SLCAN line discipline (slcan_attach,
+ slcand) can be found in the can-utils at the linux-can project, see
+ https://github.com/linux-can/can-utils for details.
+
+ The slcan driver supports up to 10 CAN netdevices by default which
+ can be changed by the 'maxdev=xx' module option. This driver can
+ also be built as a module. If so, the module will be called slcan.
+
config CAN_SUN4I
tristate "Allwinner A10 CAN controller"
depends on MACH_SUN4I || MACH_SUN7I || COMPILE_TEST
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/skb.h>
-#include <linux/can/can-ml.h>
MODULE_ALIAS_LDISC(N_SLCAN);
MODULE_DESCRIPTION("serial line CAN interface");
#define SLC_EFF_ID_LEN 8
struct slcan {
+ struct can_priv can;
int magic;
/* Various fields. */
clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
}
netif_stop_queue(dev);
+ close_candev(dev);
+ sl->can.state = CAN_STATE_STOPPED;
sl->rcount = 0;
sl->xleft = 0;
spin_unlock_bh(&sl->lock);
static int slc_open(struct net_device *dev)
{
struct slcan *sl = netdev_priv(dev);
+ int err;
if (sl->tty == NULL)
return -ENODEV;
+ /* The baud rate is not set with the command
+ * `ip link set <iface> type can bitrate <baud>' and therefore
+ * can.bittiming.bitrate is CAN_BITRATE_UNSET (0), causing
+ * open_candev() to fail. So let's set to a fake value.
+ */
+ sl->can.bittiming.bitrate = CAN_BITRATE_UNKNOWN;
+ err = open_candev(dev);
+ if (err) {
+ netdev_err(dev, "failed to open can device\n");
+ return err;
+ }
+
+ sl->can.state = CAN_STATE_ERROR_ACTIVE;
sl->flags &= BIT(SLF_INUSE);
netif_start_queue(dev);
return 0;
}
-/* Hook the destructor so we can free slcan devs at the right point in time */
-static void slc_free_netdev(struct net_device *dev)
+static void slc_dealloc(struct slcan *sl)
{
- int i = dev->base_addr;
+ int i = sl->dev->base_addr;
+ free_candev(sl->dev);
slcan_devs[i] = NULL;
}
.ndo_change_mtu = slcan_change_mtu,
};
-static void slc_setup(struct net_device *dev)
-{
- dev->netdev_ops = &slc_netdev_ops;
- dev->needs_free_netdev = true;
- dev->priv_destructor = slc_free_netdev;
-
- dev->hard_header_len = 0;
- dev->addr_len = 0;
- dev->tx_queue_len = 10;
-
- dev->mtu = CAN_MTU;
- dev->type = ARPHRD_CAN;
-
- /* New-style flags. */
- dev->flags = IFF_NOARP;
- dev->features = NETIF_F_HW_CSUM;
-}
-
/******************************************
Routines looking at TTY side.
******************************************/
static struct slcan *slc_alloc(void)
{
int i;
- char name[IFNAMSIZ];
struct net_device *dev = NULL;
- struct can_ml_priv *can_ml;
struct slcan *sl;
- int size;
for (i = 0; i < maxdev; i++) {
dev = slcan_devs[i];
if (i >= maxdev)
return NULL;
- sprintf(name, "slcan%d", i);
- size = ALIGN(sizeof(*sl), NETDEV_ALIGN) + sizeof(struct can_ml_priv);
- dev = alloc_netdev(size, name, NET_NAME_UNKNOWN, slc_setup);
+ dev = alloc_candev(sizeof(*sl), 1);
if (!dev)
return NULL;
+ snprintf(dev->name, sizeof(dev->name), "slcan%d", i);
+ dev->netdev_ops = &slc_netdev_ops;
dev->base_addr = i;
sl = netdev_priv(dev);
- can_ml = (void *)sl + ALIGN(sizeof(*sl), NETDEV_ALIGN);
- can_set_ml_priv(dev, can_ml);
/* Initialize channel control data */
sl->magic = SLCAN_MAGIC;
set_bit(SLF_INUSE, &sl->flags);
- err = register_netdevice(sl->dev);
- if (err)
+ rtnl_unlock();
+ err = register_candev(sl->dev);
+ if (err) {
+ pr_err("slcan: can't register candev\n");
goto err_free_chan;
+ }
+ } else {
+ rtnl_unlock();
}
- /* Done. We have linked the TTY line to a channel. */
- rtnl_unlock();
tty->receive_room = 65536; /* We don't flow control */
/* TTY layer expects 0 on success */
return 0;
err_free_chan:
+ rtnl_lock();
sl->tty = NULL;
tty->disc_data = NULL;
clear_bit(SLF_INUSE, &sl->flags);
- slc_free_netdev(sl->dev);
- /* do not call free_netdev before rtnl_unlock */
+ slc_dealloc(sl);
rtnl_unlock();
- free_netdev(sl->dev);
return err;
err_exit:
synchronize_rcu();
flush_work(&sl->tx_work);
- /* Flush network side */
- unregister_netdev(sl->dev);
- /* This will complete via sl_free_netdev */
+ slc_close(sl->dev);
+ unregister_candev(sl->dev);
+ rtnl_lock();
+ slc_dealloc(sl);
+ rtnl_unlock();
}
static void slcan_hangup(struct tty_struct *tty)
dev = slcan_devs[i];
if (!dev)
continue;
- slcan_devs[i] = NULL;
sl = netdev_priv(dev);
if (sl->tty) {
netdev_err(dev, "tty discipline still running\n");
}
- unregister_netdev(dev);
+ slc_close(dev);
+ unregister_candev(dev);
+ slc_dealloc(sl);
}
kfree(slcan_devs);
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