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// SPDX-License-Identifier: GPL-2.0
/*
* USB4 port device
*
* Copyright (C) 2021, Intel Corporation
* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
*/
#include <linux/acpi.h>
#include <linux/pm_runtime.h>
#include "tb.h"
static ssize_t link_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct usb4_port *usb4 = tb_to_usb4_port_device(dev);
struct tb_port *port = usb4->port;
struct tb *tb = port->sw->tb;
const char *link;
if (mutex_lock_interruptible(&tb->lock))
return -ERESTARTSYS;
if (tb_is_upstream_port(port))
link = port->sw->link_usb4 ? "usb4" : "tbt";
else if (tb_port_has_remote(port))
link = port->remote->sw->link_usb4 ? "usb4" : "tbt";
else
link = "none";
mutex_unlock(&tb->lock);
return sysfs_emit(buf, "%s\n", link);
}
static DEVICE_ATTR_RO(link);
static struct attribute *common_attrs[] = {
&dev_attr_link.attr,
NULL
};
static const struct attribute_group common_group = {
.attrs = common_attrs,
};
static const struct attribute_group *usb4_port_device_groups[] = {
&common_group,
NULL
};
static void usb4_port_device_release(struct device *dev)
{
struct usb4_port *usb4 = container_of(dev, struct usb4_port, dev);
kfree(usb4);
}
struct device_type usb4_port_device_type = {
.name = "usb4_port",
.groups = usb4_port_device_groups,
.release = usb4_port_device_release,
};
/**
* usb4_port_device_add() - Add USB4 port device
* @port: Lane 0 adapter port to add the USB4 port
*
* Creates and registers a USB4 port device for @port. Returns the new
* USB4 port device pointer or ERR_PTR() in case of error.
*/
struct usb4_port *usb4_port_device_add(struct tb_port *port)
{
struct usb4_port *usb4;
int ret;
usb4 = kzalloc(sizeof(*usb4), GFP_KERNEL);
if (!usb4)
return ERR_PTR(-ENOMEM);
usb4->port = port;
usb4->dev.type = &usb4_port_device_type;
usb4->dev.parent = &port->sw->dev;
dev_set_name(&usb4->dev, "usb4_port%d", port->port);
ret = device_register(&usb4->dev);
if (ret) {
put_device(&usb4->dev);
return ERR_PTR(ret);
}
pm_runtime_no_callbacks(&usb4->dev);
pm_runtime_set_active(&usb4->dev);
pm_runtime_enable(&usb4->dev);
pm_runtime_set_autosuspend_delay(&usb4->dev, TB_AUTOSUSPEND_DELAY);
pm_runtime_mark_last_busy(&usb4->dev);
pm_runtime_use_autosuspend(&usb4->dev);
return usb4;
}
/**
* usb4_port_device_remove() - Removes USB4 port device
* @usb4: USB4 port device
*
* Unregisters the USB4 port device from the system. The device will be
* released when the last reference is dropped.
*/
void usb4_port_device_remove(struct usb4_port *usb4)
{
device_unregister(&usb4->dev);
}
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