Commit 2f608ba1 authored by Mika Westerberg's avatar Mika Westerberg
Browse files

thunderbolt: Add details to router uevent 



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: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2e7a5b3e

drivers/thunderbolt/switch.c

+34 −0
Original line number Diff line number Diff line
@@ -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,

};