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authorOleksij Rempel <o.rempel@pengutronix.de>2021-08-18 10:12:32 +0300
committerMarc Kleine-Budde <mkl@pengutronix.de>2021-08-19 16:07:03 +0300
commit6e86a1543c378f2e8837ad88f361b7bf606c80f7 (patch)
tree6450b887ef1a071b52e134e1bb3dc533c0a6d5b3 /drivers/net
parentfe7edf2482e1e3d677cd1b5acebf5dd06d6246e6 (diff)
downloadlinux-6e86a1543c378f2e8837ad88f361b7bf606c80f7.tar.xz
can: dev: provide optional GPIO based termination support
For CAN buses to work, a termination resistor has to be present at both ends of the bus. This resistor is usually 120 Ohms, other values may be required for special bus topologies. This patch adds support for a generic GPIO based CAN termination. The resistor value has to be specified via device tree, and it can only be attached to or detached from the bus. By default the termination is not active. Link: https://lore.kernel.org/r/20210818071232.20585-4-o.rempel@pengutronix.de Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/can/dev/dev.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/net/can/dev/dev.c b/drivers/net/can/dev/dev.c
index 311d8564d611..e3d840b81357 100644
--- a/drivers/net/can/dev/dev.c
+++ b/drivers/net/can/dev/dev.c
@@ -15,6 +15,7 @@
#include <linux/can/dev.h>
#include <linux/can/skb.h>
#include <linux/can/led.h>
+#include <linux/gpio/consumer.h>
#include <linux/of.h>
#define MOD_DESC "CAN device driver interface"
@@ -400,10 +401,69 @@ void close_candev(struct net_device *dev)
}
EXPORT_SYMBOL_GPL(close_candev);
+static int can_set_termination(struct net_device *ndev, u16 term)
+{
+ struct can_priv *priv = netdev_priv(ndev);
+ int set;
+
+ if (term == priv->termination_gpio_ohms[CAN_TERMINATION_GPIO_ENABLED])
+ set = 1;
+ else
+ set = 0;
+
+ gpiod_set_value(priv->termination_gpio, set);
+
+ return 0;
+}
+
+static int can_get_termination(struct net_device *ndev)
+{
+ struct can_priv *priv = netdev_priv(ndev);
+ struct device *dev = ndev->dev.parent;
+ struct gpio_desc *gpio;
+ u32 term;
+ int ret;
+
+ /* Disabling termination by default is the safe choice: Else if many
+ * bus participants enable it, no communication is possible at all.
+ */
+ gpio = devm_gpiod_get_optional(dev, "termination", GPIOD_OUT_LOW);
+ if (IS_ERR(gpio))
+ return dev_err_probe(dev, PTR_ERR(gpio),
+ "Cannot get termination-gpios\n");
+
+ if (!gpio)
+ return 0;
+
+ ret = device_property_read_u32(dev, "termination-ohms", &term);
+ if (ret) {
+ netdev_err(ndev, "Cannot get termination-ohms: %pe\n",
+ ERR_PTR(ret));
+ return ret;
+ }
+
+ if (term > U16_MAX) {
+ netdev_err(ndev, "Invalid termination-ohms value (%u > %u)\n",
+ term, U16_MAX);
+ return -EINVAL;
+ }
+
+ priv->termination_const_cnt = ARRAY_SIZE(priv->termination_gpio_ohms);
+ priv->termination_const = priv->termination_gpio_ohms;
+ priv->termination_gpio = gpio;
+ priv->termination_gpio_ohms[CAN_TERMINATION_GPIO_DISABLED] =
+ CAN_TERMINATION_DISABLED;
+ priv->termination_gpio_ohms[CAN_TERMINATION_GPIO_ENABLED] = term;
+ priv->do_set_termination = can_set_termination;
+
+ return 0;
+}
+
/* Register the CAN network device */
int register_candev(struct net_device *dev)
{
struct can_priv *priv = netdev_priv(dev);
+ int err;
/* Ensure termination_const, termination_const_cnt and
* do_set_termination consistency. All must be either set or
@@ -419,6 +479,12 @@ int register_candev(struct net_device *dev)
if (!priv->data_bitrate_const != !priv->data_bitrate_const_cnt)
return -EINVAL;
+ if (!priv->termination_const) {
+ err = can_get_termination(dev);
+ if (err)
+ return err;
+ }
+
dev->rtnl_link_ops = &can_link_ops;
netif_carrier_off(dev);