Expose two environment variables for routers as part of the initial
uevent:
USB4_VERSION=1.0
USB4_TYPE=host|device|hub
Userspace can use this information to expose more details about each
connected device. Only USB4 devices have USB4_VERSION but all devices
have USB4_TYPE.
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/thunderbolt/switch.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 321a5bcfce65..a1b4a695080e 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -1835,6 +1835,39 @@ static void tb_switch_release(struct device *dev)
kfree(sw);
}
+static int tb_switch_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct tb_switch *sw = tb_to_switch(dev);
+ const char *type;
+
+ if (sw->config.thunderbolt_version == USB4_VERSION_1_0) {
+ if (add_uevent_var(env, "USB4_VERSION=1.0"))
+ return -ENOMEM;
+ }
+
+ if (!tb_route(sw)) {
+ type = "host";
+ } else {
+ const struct tb_port *port;
+ bool hub = false;
+
+ /* Device is hub if it has any downstream ports */
+ tb_switch_for_each_port(sw, port) {
+ if (!port->disabled && !tb_is_upstream_port(port) &&
+ tb_port_is_null(port)) {
+ hub = true;
+ break;
+ }
+ }
+
+ type = hub ? "hub" : "device";
+ }
+
+ if (add_uevent_var(env, "USB4_TYPE=%s", type))
+ return -ENOMEM;
+ return 0;
+}
+
/*
* Currently only need to provide the callbacks. Everything else is handled
* in the connection manager.
@@ -1868,6 +1901,7 @@ static const struct dev_pm_ops tb_switch_pm_ops = {
struct device_type tb_switch_type = {
.name = "thunderbolt_device",
.release = tb_switch_release,
+ .uevent = tb_switch_uevent,
.pm = &tb_switch_pm_ops,
};
--
2.30.2
