can: dev: add CAN interface termination API

This patch adds a netlink interface to configure the CAN bus termination of
CAN interfaces.

Inside the driver an array of supported termination values is defined:

const u16 drvname_termination[] = { 60, 120, CAN_TERMINATION_DISABLED };

struct drvname_priv *priv;
priv = netdev_priv(dev);

priv->termination_const = drvname_termination;
priv->termination_const_cnt = ARRAY_SIZE(drvname_termination);
priv->termination = CAN_TERMINATION_DISABLED;

And the funtion to set the value has to be defined:

priv->do_set_termination = drvname_set_termination;

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Reviewed-by: Ramesh Shanmugasundaram <Ramesh.shanmugasundaram@bp.renesas.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/uapi/linux/can/netlink.h b/include/uapi/linux/can/netlink.h
index 94ffe0c83ce7..7414771926fb 100644
--- a/include/uapi/linux/can/netlink.h
+++ b/include/uapi/linux/can/netlink.h
@@ -127,9 +127,14 @@ enum {
         IFLA_CAN_BERR_COUNTER,
         IFLA_CAN_DATA_BITTIMING,
         IFLA_CAN_DATA_BITTIMING_CONST,
+        IFLA_CAN_TERMINATION,
+        IFLA_CAN_TERMINATION_CONST,
         __IFLA_CAN_MAX
 };
 
 #define IFLA_CAN_MAX    (__IFLA_CAN_MAX - 1)
 
+/* u16 termination range: 1..65535 Ohms */
+#define CAN_TERMINATION_DISABLED 0
+
 #endif /* !_UAPI_CAN_NETLINK_H */