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thunderbolt: Add 'generation' attribute for devices 

The Thunderbolt standard went through several major iterations, here
called generation. USB4, which will be based on Thunderbolt, will be
generation 4. Let userspace know the generation of the controller in
the devices in order to distinguish between Thunderbolt and USB4, so
it can be shown in various user interfaces.

Signed-off-by: Christian Kellner <christian@kellner.me>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Christian Kellner 2019-10-03 19:32:40 +02:00 committed by Mika Westerberg
parent da0c9ea146
commit b406357c57
2 changed files with 18 additions and 0 deletions
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8
Documentation/ABI/testing/sysfs-bus-thunderbolt
View File

@ -80,6 +80,14 @@ Contact: thunderbolt-software@lists.01.org
Description: This attribute contains 1 if Thunderbolt device was already
authorized on boot and 0 otherwise.
What: /sys/bus/thunderbolt/devices/.../generation
Date: Jan 2020
KernelVersion: 5.5
Contact: Christian Kellner <christian@kellner.me>
Description: This attribute contains the generation of the Thunderbolt
controller associated with the device. It will contain 4
for USB4.
What: /sys/bus/thunderbolt/devices/.../key
Date: Sep 2017
KernelVersion: 4.13

10
drivers/thunderbolt/switch.c
View File

@ -1120,6 +1120,15 @@ device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
}
static DEVICE_ATTR_RO(device_name);
static ssize_t
generation_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sprintf(buf, "%u\n", sw->generation);
}
static DEVICE_ATTR_RO(generation);
static ssize_t key_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -1325,6 +1334,7 @@ static struct attribute *switch_attrs[] = {
&dev_attr_boot.attr,
&dev_attr_device.attr,
&dev_attr_device_name.attr,
&dev_attr_generation.attr,
&dev_attr_key.attr,
&dev_attr_nvm_authenticate.attr,
&dev_attr_nvm_version.attr,