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usb: Link the ports to the connectors they are attached to

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Creating link to the USB Type-C connector for every new port
that is added when possible.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20211223082349.45616-1-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2021-12-23 11:23:49 +03:00 committed by Greg Kroah-Hartman
parent 882c982dad
commit 8c67d06f3f
2 changed files with 41 additions and 0 deletions
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9
Documentation/ABI/testing/sysfs-bus-usb
View File

@ -244,6 +244,15 @@ Description:
is permitted, "u2" if only u2 is permitted, "u1_u2" if both u1 and
u2 are permitted.
What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/connector
Date: December 2021
Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Description:
Link to the USB Type-C connector when available. 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/usb/devices/.../power/usb2_lpm_l1_timeout
Date: May 2013
Contact: Mathias Nyman <mathias.nyman@linux.intel.com>

32
drivers/usb/core/port.c
View File

@ -9,6 +9,7 @@
#include <linux/slab.h>
#include <linux/pm_qos.h>
#include <linux/component.h>
#include "hub.h"
@ -528,6 +529,32 @@ static void find_and_link_peer(struct usb_hub *hub, int port1)
link_peers_report(port_dev, peer);
}
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,
};
int usb_hub_create_port_device(struct usb_hub *hub, int port1)
{
struct usb_port *port_dev;
@ -577,6 +604,10 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
find_and_link_peer(hub, port1);
retval = component_add(&port_dev->dev, &connector_ops);
if (retval)
dev_warn(&port_dev->dev, "failed to add component\n");
/*
* Enable runtime pm and hold a refernce that hub_configure()
* will drop once the PM_QOS_NO_POWER_OFF flag state has been set
@ -619,5 +650,6 @@ void usb_hub_remove_port_device(struct usb_hub *hub, int port1)
peer = port_dev->peer;
if (peer)
unlink_peers(port_dev, peer);
component_del(&port_dev->dev, &connector_ops);
device_unregister(&port_dev->dev);
}