netdev - [PATCH net-next] net: wwan: core: Add WWAN device index sysfs attribute

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Date:   Tue, 25 May 2021 18:31:18 +0200
From:   Loic Poulain <loic.poulain@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, m.chetan.kumar@...el.com,
        Loic Poulain <loic.poulain@...aro.org>
Subject: [PATCH net-next] net: wwan: core: Add WWAN device index sysfs attribute

Add index sysfs attribute for WWAN devices. This index is used to
uniquely indentify and reference a WWAN device. 'index' is the
attribute name that other device classes use (wireless, v4l2-dev,
rfkill, etc...).

Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
---
 drivers/net/wwan/wwan_core.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/net/wwan/wwan_core.c b/drivers/net/wwan/wwan_core.c
index 92a8a6f..6e8f19c 100644
--- a/drivers/net/wwan/wwan_core.c
+++ b/drivers/net/wwan/wwan_core.c
@@ -63,6 +63,20 @@ struct wwan_port {
 	wait_queue_head_t waitqueue;
 };
 
+static ssize_t index_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct wwan_device *wwan = to_wwan_dev(dev);
+
+	return sprintf(buf, "%d\n", wwan->id);
+}
+static DEVICE_ATTR_RO(index);
+
+static struct attribute *wwan_dev_attrs[] = {
+	&dev_attr_index.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(wwan_dev);
+
 static void wwan_dev_destroy(struct device *dev)
 {
 	struct wwan_device *wwandev = to_wwan_dev(dev);
@@ -74,6 +88,7 @@ static void wwan_dev_destroy(struct device *dev)
 static const struct device_type wwan_dev_type = {
 	.name    = "wwan_dev",
 	.release = wwan_dev_destroy,
+	.groups = wwan_dev_groups,
 };
 
 static int wwan_dev_parent_match(struct device *dev, const void *parent)
-- 
2.7.4