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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/thunderbolt/usb4_port.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/thunderbolt/usb4_port.c')
-rw-r--r--drivers/thunderbolt/usb4_port.c323
1 files changed, 323 insertions, 0 deletions
diff --git a/drivers/thunderbolt/usb4_port.c b/drivers/thunderbolt/usb4_port.c
new file mode 100644
index 0000000000..e355bfd634
--- /dev/null
+++ b/drivers/thunderbolt/usb4_port.c
@@ -0,0 +1,323 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USB4 port device
+ *
+ * Copyright (C) 2021, Intel Corporation
+ * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
+ */
+
+#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)
+{
+ 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 if (port->xdomain)
+ link = port->xdomain->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 int usb4_port_offline(struct usb4_port *usb4)
+{
+ struct tb_port *port = usb4->port;
+ int ret;
+
+ ret = tb_acpi_power_on_retimers(port);
+ if (ret)
+ return ret;
+
+ ret = usb4_port_router_offline(port);
+ if (ret) {
+ tb_acpi_power_off_retimers(port);
+ return ret;
+ }
+
+ ret = tb_retimer_scan(port, false);
+ if (ret) {
+ usb4_port_router_online(port);
+ tb_acpi_power_off_retimers(port);
+ }
+
+ return ret;
+}
+
+static void usb4_port_online(struct usb4_port *usb4)
+{
+ struct tb_port *port = usb4->port;
+
+ usb4_port_router_online(port);
+ tb_acpi_power_off_retimers(port);
+}
+
+static ssize_t offline_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb4_port *usb4 = tb_to_usb4_port_device(dev);
+
+ return sysfs_emit(buf, "%d\n", usb4->offline);
+}
+
+static ssize_t offline_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb4_port *usb4 = tb_to_usb4_port_device(dev);
+ struct tb_port *port = usb4->port;
+ struct tb *tb = port->sw->tb;
+ bool val;
+ int ret;
+
+ ret = kstrtobool(buf, &val);
+ if (ret)
+ return ret;
+
+ pm_runtime_get_sync(&usb4->dev);
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out_rpm;
+ }
+
+ if (val == usb4->offline)
+ goto out_unlock;
+
+ /* Offline mode works only for ports that are not connected */
+ if (tb_port_has_remote(port)) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+
+ if (val) {
+ ret = usb4_port_offline(usb4);
+ if (ret)
+ goto out_unlock;
+ } else {
+ usb4_port_online(usb4);
+ tb_retimer_remove_all(port);
+ }
+
+ usb4->offline = val;
+ tb_port_dbg(port, "%s offline mode\n", val ? "enter" : "exit");
+
+out_unlock:
+ mutex_unlock(&tb->lock);
+out_rpm:
+ pm_runtime_mark_last_busy(&usb4->dev);
+ pm_runtime_put_autosuspend(&usb4->dev);
+
+ return ret ? ret : count;
+}
+static DEVICE_ATTR_RW(offline);
+
+static ssize_t rescan_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb4_port *usb4 = tb_to_usb4_port_device(dev);
+ struct tb_port *port = usb4->port;
+ struct tb *tb = port->sw->tb;
+ bool val;
+ int ret;
+
+ ret = kstrtobool(buf, &val);
+ if (ret)
+ return ret;
+
+ if (!val)
+ return count;
+
+ pm_runtime_get_sync(&usb4->dev);
+
+ if (mutex_lock_interruptible(&tb->lock)) {
+ ret = -ERESTARTSYS;
+ goto out_rpm;
+ }
+
+ /* Must be in offline mode already */
+ if (!usb4->offline) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ tb_retimer_remove_all(port);
+ ret = tb_retimer_scan(port, true);
+
+out_unlock:
+ mutex_unlock(&tb->lock);
+out_rpm:
+ pm_runtime_mark_last_busy(&usb4->dev);
+ pm_runtime_put_autosuspend(&usb4->dev);
+
+ return ret ? ret : count;
+}
+static DEVICE_ATTR_WO(rescan);
+
+static struct attribute *service_attrs[] = {
+ &dev_attr_offline.attr,
+ &dev_attr_rescan.attr,
+ NULL
+};
+
+static umode_t service_attr_is_visible(struct kobject *kobj,
+ struct attribute *attr, int n)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct usb4_port *usb4 = tb_to_usb4_port_device(dev);
+
+ /*
+ * Always need some platform help to cycle the modes so that
+ * retimers can be accessed through the sideband.
+ */
+ return usb4->can_offline ? attr->mode : 0;
+}
+
+static const struct attribute_group service_group = {
+ .attrs = service_attrs,
+ .is_visible = service_attr_is_visible,
+};
+
+static const struct attribute_group *usb4_port_device_groups[] = {
+ &common_group,
+ &service_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);
+ }
+
+ 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);
+ }
+ }
+
+ if (!tb_is_upstream_port(port))
+ device_set_wakeup_capable(&usb4->dev, true);
+
+ 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)
+{
+ if (dev_fwnode(&usb4->dev))
+ component_del(&usb4->dev, &connector_ops);
+ device_unregister(&usb4->dev);
+}
+
+/**
+ * usb4_port_device_resume() - Resumes USB4 port device
+ * @usb4: USB4 port device
+ *
+ * Used to resume USB4 port device after sleep state.
+ */
+int usb4_port_device_resume(struct usb4_port *usb4)
+{
+ return usb4->offline ? usb4_port_offline(usb4) : 0;
+}