[PATCH 6/8] arcnet: com20020-pci: add attribute to readback backplane status

[Michael Grzeschik]

We add the sysfs interface the read back the backplane
status of the interface.

Signed-off-by: Michael Grzeschik <m.grzesc...@pengutronix.de>
---
 drivers/net/arcnet/com20020-pci.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/net/arcnet/com20020-pci.c 
b/drivers/net/arcnet/com20020-pci.c
index 47f80b83dcf42..3f85a4d5f8c90 100644
--- a/drivers/net/arcnet/com20020-pci.c
+++ b/drivers/net/arcnet/com20020-pci.c
@@ -93,6 +93,27 @@ static void led_recon_set(struct led_classdev *led_cdev,
        outb(!!value, priv->misc + ci->leds[card->index].red);
 }
 
+static ssize_t backplane_mode_show(struct device *dev,
+                                  struct device_attribute *attr,
+                                  char *buf)
+{
+       struct net_device *net_dev = to_net_dev(dev);
+       struct arcnet_local *lp = netdev_priv(net_dev);
+
+       return sprintf(buf, "%s\n", lp->backplane ? "true" : "false");
+}
+static DEVICE_ATTR_RO(backplane_mode);
+
+static struct attribute *com20020_state_attrs[] = {
+       &dev_attr_backplane_mode.attr,
+       NULL,
+};
+
+static struct attribute_group com20020_state_group = {
+       .name = NULL,
+       .attrs = com20020_state_attrs,
+};
+
 static void com20020pci_remove(struct pci_dev *pdev);
 
 static int com20020pci_probe(struct pci_dev *pdev,
@@ -170,6 +191,7 @@ static int com20020pci_probe(struct pci_dev *pdev,
                SET_NETDEV_DEV(dev, &pdev->dev);
                dev->base_addr = ioaddr;
                dev->dev_addr[0] = node;
+               dev->sysfs_groups[0] = &com20020_state_group;
                dev->irq = pdev->irq;
                lp->card_name = "PCI COM20020";
                lp->card_flags = ci->flags;
-- 
2.11.0