diff options
author | Marc Kleine-Budde <mkl@pengutronix.de> | 2017-01-11 17:05:35 +0100 |
---|---|---|
committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2017-01-24 13:52:00 +0100 |
commit | 431af779256cd6cb8328ac23c5696bae63c33a51 (patch) | |
tree | fdfd3634d376b4e010649e40bb6edf2f80d35948 /drivers/net/can/dev.c | |
parent | c3606d438a14faa8319eccb75b9502960a97af16 (diff) |
can: dev: add CAN interface API for fixed bitrates
Some CAN interfaces only support fixed fixed bitrates. This patch adds a
netlink interface to get the list of the CAN interface's fixed bitrates and
data bitrates.
Inside the driver arrays of supported data- bitrate values are defined.
const u32 drvname_bitrate[] = { 20000, 50000, 100000 };
const u32 drvname_data_bitrate[] = { 200000, 500000, 1000000 };
struct drvname_priv *priv;
priv = netdev_priv(dev);
priv->bitrate_const = drvname_bitrate;
priv->bitrate_const_cnt = ARRAY_SIZE(drvname_bitrate);
priv->data_bitrate_const = drvname_data_bitrate;
priv->data_bitrate_const_cnt = ARRAY_SIZE(drvname_data_bitrate);
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can/dev.c')
-rw-r--r-- | drivers/net/can/dev.c | 81 |
1 files changed, 65 insertions, 16 deletions
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c index afcf487382c9..611d16a7061d 100644 --- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -279,8 +279,29 @@ static int can_fixup_bittiming(struct net_device *dev, struct can_bittiming *bt, return 0; } +/* Checks the validity of predefined bitrate settings */ +static int can_validate_bitrate(struct net_device *dev, struct can_bittiming *bt, + const u32 *bitrate_const, + const unsigned int bitrate_const_cnt) +{ + struct can_priv *priv = netdev_priv(dev); + unsigned int i; + + for (i = 0; i < bitrate_const_cnt; i++) { + if (bt->bitrate == bitrate_const[i]) + break; + } + + if (i >= priv->bitrate_const_cnt) + return -EINVAL; + + return 0; +} + static int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt, - const struct can_bittiming_const *btc) + const struct can_bittiming_const *btc, + const u32 *bitrate_const, + const unsigned int bitrate_const_cnt) { int err; @@ -290,10 +311,13 @@ static int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt, * alternatively the CAN timing parameters (tq, prop_seg, etc.) are * provided directly which are then checked and fixed up. */ - if (!bt->tq && bt->bitrate) + if (!bt->tq && bt->bitrate && btc) err = can_calc_bittiming(dev, bt, btc); - else if (bt->tq && !bt->bitrate) + else if (bt->tq && !bt->bitrate && btc) err = can_fixup_bittiming(dev, bt, btc); + else if (!bt->tq && bt->bitrate && bitrate_const) + err = can_validate_bitrate(dev, bt, bitrate_const, + bitrate_const_cnt); else err = -EINVAL; @@ -878,12 +902,12 @@ static int can_changelink(struct net_device *dev, return -EOPNOTSUPP; memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt)); - if (priv->bittiming_const) { - err = can_get_bittiming(dev, &bt, - priv->bittiming_const); - if (err) - return err; - } + err = can_get_bittiming(dev, &bt, + priv->bittiming_const, + priv->bitrate_const, + priv->bitrate_const_cnt); + if (err) + return err; memcpy(&priv->bittiming, &bt, sizeof(bt)); if (priv->do_set_bittiming) { @@ -962,12 +986,12 @@ static int can_changelink(struct net_device *dev, memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]), sizeof(dbt)); - if (priv->data_bittiming_const) { - err = can_get_bittiming(dev, &dbt, - priv->data_bittiming_const); - if (err) - return err; - } + err = can_get_bittiming(dev, &dbt, + priv->data_bittiming_const, + priv->data_bitrate_const, + priv->data_bitrate_const_cnt); + if (err) + return err; memcpy(&priv->data_bittiming, &dbt, sizeof(dbt)); if (priv->do_set_data_bittiming) { @@ -1029,6 +1053,12 @@ static size_t can_get_size(const struct net_device *dev) size += nla_total_size(sizeof(*priv->termination_const) * /* IFLA_CAN_TERMINATION_CONST */ priv->termination_const_cnt); } + if (priv->bitrate_const) /* IFLA_CAN_BITRATE_CONST */ + size += nla_total_size(sizeof(*priv->bitrate_const) * + priv->bitrate_const_cnt); + if (priv->data_bitrate_const) /* IFLA_CAN_DATA_BITRATE_CONST */ + size += nla_total_size(sizeof(*priv->data_bitrate_const) * + priv->data_bitrate_const_cnt); return size; } @@ -1074,7 +1104,20 @@ static int can_fill_info(struct sk_buff *skb, const struct net_device *dev) nla_put(skb, IFLA_CAN_TERMINATION_CONST, sizeof(*priv->termination_const) * priv->termination_const_cnt, - priv->termination_const)))) + priv->termination_const))) || + + (priv->bitrate_const && + nla_put(skb, IFLA_CAN_BITRATE_CONST, + sizeof(*priv->bitrate_const) * + priv->bitrate_const_cnt, + priv->bitrate_const)) || + + (priv->data_bitrate_const && + nla_put(skb, IFLA_CAN_DATA_BITRATE_CONST, + sizeof(*priv->data_bitrate_const) * + priv->data_bitrate_const_cnt, + priv->data_bitrate_const)) + ) return -EMSGSIZE; @@ -1140,6 +1183,12 @@ int register_candev(struct net_device *dev) (!priv->termination_const != !priv->do_set_termination)) return -EINVAL; + if (!priv->bitrate_const != !priv->bitrate_const_cnt) + return -EINVAL; + + if (!priv->data_bitrate_const != !priv->data_bitrate_const_cnt) + return -EINVAL; + dev->rtnl_link_ops = &can_link_ops; return register_netdev(dev); } |