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| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2021-03-02 16:51:44 +0300 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2021-04-09 12:26:10 +0300 |
| commit | 2f608ba19610e9b05c38747d41b97af75455a478 (patch) | |
| tree | a0b75d16bf86ffaee762fa32448f325787418651 | |
| parent | 2e7a5b3e22368b65583d1b717e267de0a5906c32 (diff) | |
| download | linux-2f608ba19610e9b05c38747d41b97af75455a478.tar.xz | |
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: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/thunderbolt/switch.c | 34 |
1 files changed, 34 insertions, 0 deletions
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, }; |