Commit 5dddb416 authored by Heikki Krogerus's avatar Heikki Krogerus Committed by Mika Westerberg
Browse files

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



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: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: default avatarWon Chung <wonchung@google.com>
Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent 84d4333c

Documentation/ABI/testing/sysfs-bus-thunderbolt

+10 −0
Original line number Diff line number Diff line
@@ -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

drivers/thunderbolt/usb4_port.c

+38 −0
Original line number Diff line number Diff line
@@ -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);

}