324 lines
7.1 KiB
C
324 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* USB4 port device
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*
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* Copyright (C) 2021, Intel Corporation
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* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#include <linux/pm_runtime.h>
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#include <linux/component.h>
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#include <linux/property.h>
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#include "tb.h"
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static int connector_bind(struct device *dev, struct device *connector, void *data)
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{
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int ret;
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ret = sysfs_create_link(&dev->kobj, &connector->kobj, "connector");
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if (ret)
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return ret;
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ret = sysfs_create_link(&connector->kobj, &dev->kobj, dev_name(dev));
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if (ret)
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sysfs_remove_link(&dev->kobj, "connector");
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return ret;
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}
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static void connector_unbind(struct device *dev, struct device *connector, void *data)
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{
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sysfs_remove_link(&connector->kobj, dev_name(dev));
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sysfs_remove_link(&dev->kobj, "connector");
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}
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static const struct component_ops connector_ops = {
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.bind = connector_bind,
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.unbind = connector_unbind,
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};
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static ssize_t link_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct usb4_port *usb4 = tb_to_usb4_port_device(dev);
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struct tb_port *port = usb4->port;
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struct tb *tb = port->sw->tb;
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const char *link;
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if (mutex_lock_interruptible(&tb->lock))
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return -ERESTARTSYS;
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if (tb_is_upstream_port(port))
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link = port->sw->link_usb4 ? "usb4" : "tbt";
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else if (tb_port_has_remote(port))
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link = port->remote->sw->link_usb4 ? "usb4" : "tbt";
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else if (port->xdomain)
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link = port->xdomain->link_usb4 ? "usb4" : "tbt";
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else
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link = "none";
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mutex_unlock(&tb->lock);
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return sysfs_emit(buf, "%s\n", link);
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}
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static DEVICE_ATTR_RO(link);
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static struct attribute *common_attrs[] = {
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&dev_attr_link.attr,
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NULL
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};
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static const struct attribute_group common_group = {
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.attrs = common_attrs,
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};
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static int usb4_port_offline(struct usb4_port *usb4)
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{
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struct tb_port *port = usb4->port;
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int ret;
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ret = tb_acpi_power_on_retimers(port);
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if (ret)
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return ret;
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ret = usb4_port_router_offline(port);
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if (ret) {
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tb_acpi_power_off_retimers(port);
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return ret;
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}
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ret = tb_retimer_scan(port, false);
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if (ret) {
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usb4_port_router_online(port);
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tb_acpi_power_off_retimers(port);
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}
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return ret;
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}
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static void usb4_port_online(struct usb4_port *usb4)
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{
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struct tb_port *port = usb4->port;
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usb4_port_router_online(port);
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tb_acpi_power_off_retimers(port);
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}
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static ssize_t offline_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usb4_port *usb4 = tb_to_usb4_port_device(dev);
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return sysfs_emit(buf, "%d\n", usb4->offline);
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}
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static ssize_t offline_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb4_port *usb4 = tb_to_usb4_port_device(dev);
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struct tb_port *port = usb4->port;
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struct tb *tb = port->sw->tb;
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bool val;
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int ret;
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ret = kstrtobool(buf, &val);
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if (ret)
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return ret;
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pm_runtime_get_sync(&usb4->dev);
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if (mutex_lock_interruptible(&tb->lock)) {
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ret = -ERESTARTSYS;
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goto out_rpm;
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}
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if (val == usb4->offline)
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goto out_unlock;
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/* Offline mode works only for ports that are not connected */
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if (tb_port_has_remote(port)) {
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ret = -EBUSY;
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goto out_unlock;
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}
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if (val) {
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ret = usb4_port_offline(usb4);
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if (ret)
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goto out_unlock;
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} else {
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usb4_port_online(usb4);
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tb_retimer_remove_all(port);
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}
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usb4->offline = val;
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tb_port_dbg(port, "%s offline mode\n", val ? "enter" : "exit");
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out_unlock:
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mutex_unlock(&tb->lock);
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out_rpm:
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pm_runtime_mark_last_busy(&usb4->dev);
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pm_runtime_put_autosuspend(&usb4->dev);
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return ret ? ret : count;
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}
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static DEVICE_ATTR_RW(offline);
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static ssize_t rescan_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb4_port *usb4 = tb_to_usb4_port_device(dev);
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struct tb_port *port = usb4->port;
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struct tb *tb = port->sw->tb;
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bool val;
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int ret;
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ret = kstrtobool(buf, &val);
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if (ret)
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return ret;
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if (!val)
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return count;
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pm_runtime_get_sync(&usb4->dev);
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if (mutex_lock_interruptible(&tb->lock)) {
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ret = -ERESTARTSYS;
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goto out_rpm;
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}
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/* Must be in offline mode already */
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if (!usb4->offline) {
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ret = -EINVAL;
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goto out_unlock;
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}
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tb_retimer_remove_all(port);
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ret = tb_retimer_scan(port, true);
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out_unlock:
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mutex_unlock(&tb->lock);
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out_rpm:
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pm_runtime_mark_last_busy(&usb4->dev);
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pm_runtime_put_autosuspend(&usb4->dev);
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return ret ? ret : count;
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}
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static DEVICE_ATTR_WO(rescan);
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static struct attribute *service_attrs[] = {
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&dev_attr_offline.attr,
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&dev_attr_rescan.attr,
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NULL
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};
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static umode_t service_attr_is_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct usb4_port *usb4 = tb_to_usb4_port_device(dev);
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/*
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* Always need some platform help to cycle the modes so that
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* retimers can be accessed through the sideband.
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*/
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return usb4->can_offline ? attr->mode : 0;
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}
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static const struct attribute_group service_group = {
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.attrs = service_attrs,
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.is_visible = service_attr_is_visible,
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};
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static const struct attribute_group *usb4_port_device_groups[] = {
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&common_group,
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&service_group,
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NULL
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};
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static void usb4_port_device_release(struct device *dev)
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{
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struct usb4_port *usb4 = container_of(dev, struct usb4_port, dev);
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kfree(usb4);
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}
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struct device_type usb4_port_device_type = {
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.name = "usb4_port",
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.groups = usb4_port_device_groups,
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.release = usb4_port_device_release,
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};
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/**
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* usb4_port_device_add() - Add USB4 port device
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* @port: Lane 0 adapter port to add the USB4 port
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*
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* Creates and registers a USB4 port device for @port. Returns the new
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* USB4 port device pointer or ERR_PTR() in case of error.
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*/
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struct usb4_port *usb4_port_device_add(struct tb_port *port)
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{
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struct usb4_port *usb4;
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int ret;
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usb4 = kzalloc(sizeof(*usb4), GFP_KERNEL);
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if (!usb4)
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return ERR_PTR(-ENOMEM);
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usb4->port = port;
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usb4->dev.type = &usb4_port_device_type;
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usb4->dev.parent = &port->sw->dev;
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dev_set_name(&usb4->dev, "usb4_port%d", port->port);
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ret = device_register(&usb4->dev);
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if (ret) {
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put_device(&usb4->dev);
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return ERR_PTR(ret);
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}
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if (dev_fwnode(&usb4->dev)) {
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ret = component_add(&usb4->dev, &connector_ops);
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if (ret) {
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dev_err(&usb4->dev, "failed to add component\n");
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device_unregister(&usb4->dev);
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}
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}
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if (!tb_is_upstream_port(port))
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device_set_wakeup_capable(&usb4->dev, true);
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pm_runtime_no_callbacks(&usb4->dev);
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pm_runtime_set_active(&usb4->dev);
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pm_runtime_enable(&usb4->dev);
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pm_runtime_set_autosuspend_delay(&usb4->dev, TB_AUTOSUSPEND_DELAY);
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pm_runtime_mark_last_busy(&usb4->dev);
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pm_runtime_use_autosuspend(&usb4->dev);
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return usb4;
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}
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/**
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* usb4_port_device_remove() - Removes USB4 port device
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* @usb4: USB4 port device
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*
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* Unregisters the USB4 port device from the system. The device will be
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* released when the last reference is dropped.
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*/
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void usb4_port_device_remove(struct usb4_port *usb4)
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{
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if (dev_fwnode(&usb4->dev))
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component_del(&usb4->dev, &connector_ops);
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device_unregister(&usb4->dev);
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}
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/**
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* usb4_port_device_resume() - Resumes USB4 port device
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* @usb4: USB4 port device
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*
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* Used to resume USB4 port device after sleep state.
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*/
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int usb4_port_device_resume(struct usb4_port *usb4)
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{
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return usb4->offline ? usb4_port_offline(usb4) : 0;
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}
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