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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@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Loic Poulain 2021-05-25 18:31:18 +02:00 committed by David S. Miller
parent 1b19b3f790
commit e4e92ee787
1 changed files with 15 additions and 0 deletions
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15
drivers/net/wwan/wwan_core.c
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@ -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)