diff options
| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2022-09-27 18:07:07 +0300 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2023-02-06 15:57:26 +0300 |
| commit | 5988bf737deed86d6186a21e73e2fc253a4ff466 (patch) | |
| tree | 01a7b4ea6092f729a00c69c0edc515a4142d4365 | |
| parent | 286c0e09e8e07de0f116a01aa234b05d9956dcf5 (diff) | |
| download | linux-5988bf737deed86d6186a21e73e2fc253a4ff466.tar.xz | |
can: bittiming: factor out can_sjw_set_default() and can_sjw_check()
Factor out the functionality of assigning a SJW default value into
can_sjw_set_default() and the checking the SJW limits into
can_sjw_check().
This functions will be improved and called from a different function
in the following patches.
Link: https://lore.kernel.org/all/20230202110854.2318594-11-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
| -rw-r--r-- | drivers/net/can/dev/bittiming.c | 30 | ||||
| -rw-r--r-- | include/linux/can/bittiming.h | 5 |
2 files changed, 31 insertions, 4 deletions
diff --git a/drivers/net/can/dev/bittiming.c b/drivers/net/can/dev/bittiming.c index 0b0b8c767c5b..101de1b3bf30 100644 --- a/drivers/net/can/dev/bittiming.c +++ b/drivers/net/can/dev/bittiming.c @@ -6,6 +6,24 @@ #include <linux/can/dev.h> +void can_sjw_set_default(struct can_bittiming *bt) +{ + if (bt->sjw) + return; + + /* If user space provides no sjw, use 1 as default */ + bt->sjw = 1; +} + +int can_sjw_check(const struct net_device *dev, const struct can_bittiming *bt, + const struct can_bittiming_const *btc, struct netlink_ext_ack *extack) +{ + if (bt->sjw > btc->sjw_max) + return -ERANGE; + + return 0; +} + /* Checks the validity of the specified bit-timing parameters prop_seg, * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate * prescaler value brp. You can find more information in the header @@ -18,12 +36,16 @@ static int can_fixup_bittiming(const struct net_device *dev, struct can_bittimin const struct can_priv *priv = netdev_priv(dev); unsigned int tseg1; u64 brp64; + int err; + + can_sjw_set_default(bt); + + err = can_sjw_check(dev, bt, btc, extack); + if (err) + return err; tseg1 = bt->prop_seg + bt->phase_seg1; - if (!bt->sjw) - bt->sjw = 1; - if (bt->sjw > btc->sjw_max || - tseg1 < btc->tseg1_min || tseg1 > btc->tseg1_max || + if (tseg1 < btc->tseg1_min || tseg1 > btc->tseg1_max || bt->phase_seg2 < btc->tseg2_min || bt->phase_seg2 > btc->tseg2_max) return -ERANGE; diff --git a/include/linux/can/bittiming.h b/include/linux/can/bittiming.h index 53d693ae5397..6cb2ae308e3f 100644 --- a/include/linux/can/bittiming.h +++ b/include/linux/can/bittiming.h @@ -138,6 +138,11 @@ can_calc_tdco(struct can_tdc *tdc, const struct can_tdc_const *tdc_const, } #endif /* CONFIG_CAN_CALC_BITTIMING */ +void can_sjw_set_default(struct can_bittiming *bt); + +int can_sjw_check(const struct net_device *dev, const struct can_bittiming *bt, + const struct can_bittiming_const *btc, struct netlink_ext_ack *extack); + int can_get_bittiming(const struct net_device *dev, struct can_bittiming *bt, const struct can_bittiming_const *btc, const u32 *bitrate_const, |