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authorVincent Mailhol <mailhol.vincent@wanadoo.fr>2021-09-18 12:56:36 +0300
committerMarc Kleine-Budde <mkl@pengutronix.de>2021-10-24 17:24:29 +0300
commite8060f08cd69d1d692cfb9f0a2808477a501f35a (patch)
treeaba297da76c0be7c5cc43789868c46d8ca2cd245 /include/linux/can
parentd99755f71a80df33b981484f0d3bb956ed15a247 (diff)
downloadlinux-e8060f08cd69d1d692cfb9f0a2808477a501f35a.tar.xz
can: netlink: add can_priv::do_get_auto_tdcv() to retrieve tdcv from device
Some CAN device can measure the TDCV (Transmission Delay Compensation Value) automatically for each transmitted CAN frames. A callback function do_get_auto_tdcv() is added to retrieve that value. This function is used only if CAN_CTRLMODE_TDC_AUTO is enabled (if CAN_CTRLMODE_TDC_MANUAL is selected, the TDCV value is provided by the user). If the device does not support reporting of TDCV, do_get_auto_tdcv() should be set to NULL and TDCV will not be reported by the netlink interface. On success, do_get_auto_tdcv() shall return 0. If the value can not be measured by the device, for example because network is down or because no frames were transmitted yet, can_priv::do_get_auto_tdcv() shall return a negative error code (e.g. -EINVAL) to signify that the value is not yet available. In such cases, TDCV is not reported by the netlink interface. Link: https://lore.kernel.org/all/20210918095637.20108-6-mailhol.vincent@wanadoo.fr CC: Stefan Mätje <stefan.maetje@esd.eu> Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'include/linux/can')
-rw-r--r--include/linux/can/dev.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 6dacbbb41e68..b4aa0f048cab 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -82,6 +82,7 @@ struct can_priv {
enum can_state *state);
int (*do_get_berr_counter)(const struct net_device *dev,
struct can_berr_counter *bec);
+ int (*do_get_auto_tdcv)(const struct net_device *dev, u32 *tdcv);
unsigned int echo_skb_max;
struct sk_buff **echo_skb;