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thunderbolt: Link USB4 ports to their USB Type-C connectors

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Creating a symlink pointing to the correct USB Type-C
connector for the on-board USB4 ports when they are created.
The link will be created only if the firmware is able to
describe the connection between the port and its connector.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Won Chung <wonchung@google.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Heikki Krogerus 2022-04-18 17:59:32 +00:00 committed by Mika Westerberg
parent 84d4333c1e
commit 5dddb41692
2 changed files with 48 additions and 0 deletions
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10
Documentation/ABI/testing/sysfs-bus-thunderbolt
View File

@ -293,6 +293,16 @@ Contact: thunderbolt-software@lists.01.org
Description: This contains XDomain service specific settings as
bitmask. Format: %x
What: /sys/bus/thunderbolt/devices/usb4_portX/connector
Date: April 2022
Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Description:
Symlink to the USB Type-C connector. This link is only
created when USB Type-C Connector Class is enabled,
and only if the system firmware is capable of
describing the connection between a port and its
connector.
What: /sys/bus/thunderbolt/devices/usb4_portX/link
Date: Sep 2021
KernelVersion: v5.14

38
drivers/thunderbolt/usb4_port.c
View File

@ -7,9 +7,37 @@
*/
#include <linux/pm_runtime.h>
#include <linux/component.h>
#include <linux/property.h>
#include "tb.h"
static int connector_bind(struct device *dev, struct device *connector, void *data)
{
int ret;
ret = sysfs_create_link(&dev->kobj, &connector->kobj, "connector");
if (ret)
return ret;
ret = sysfs_create_link(&connector->kobj, &dev->kobj, dev_name(dev));
if (ret)
sysfs_remove_link(&dev->kobj, "connector");
return ret;
}
static void connector_unbind(struct device *dev, struct device *connector, void *data)
{
sysfs_remove_link(&connector->kobj, dev_name(dev));
sysfs_remove_link(&dev->kobj, "connector");
}
static const struct component_ops connector_ops = {
.bind = connector_bind,
.unbind = connector_unbind,
};
static ssize_t link_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -246,6 +274,14 @@ struct usb4_port *usb4_port_device_add(struct tb_port *port)
return ERR_PTR(ret);
}
if (dev_fwnode(&usb4->dev)) {
ret = component_add(&usb4->dev, &connector_ops);
if (ret) {
dev_err(&usb4->dev, "failed to add component\n");
device_unregister(&usb4->dev);
}
}
pm_runtime_no_callbacks(&usb4->dev);
pm_runtime_set_active(&usb4->dev);
pm_runtime_enable(&usb4->dev);
@ -265,6 +301,8 @@ struct usb4_port *usb4_port_device_add(struct tb_port *port)
*/
void usb4_port_device_remove(struct usb4_port *usb4)
{
if (dev_fwnode(&usb4->dev))
component_del(&usb4->dev, &connector_ops);
device_unregister(&usb4->dev);
}