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From:   Christian Kellner <ckellner@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     Mario Limonciello <Mario.Limonciello@dell.com>,
        Christian Kellner <christian@kellner.me>,
        Andreas Noever <andreas.noever@gmail.com>,
        Michael Jamet <michael.jamet@intel.com>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Yehezkel Bernat <YehezkelShB@gmail.com>
Subject: [PATCH] thunderbolt: Add 'generation' attribute for devices
Date:   Thu,  3 Oct 2019 19:32:40 +0200
Message-Id: <20191003173242.80938-1-ckellner@redhat.com>
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From: Christian Kellner <christian@kellner.me>

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>
---
 Documentation/ABI/testing/sysfs-bus-thunderbolt |  8 ++++++++
 drivers/thunderbolt/switch.c                    | 10 ++++++++++
 2 files changed, 18 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt b/Documentatio=
n/ABI/testing/sysfs-bus-thunderbolt
index b21fba14689b..630e51344f1c 100644
--- a/Documentation/ABI/testing/sysfs-bus-thunderbolt
+++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt
@@ -80,6 +80,14 @@ Contact:=09thunderbolt-software@lists.01.org
 Description:=09This attribute contains 1 if Thunderbolt device was already
 =09=09authorized on boot and 0 otherwise.
=20
+What: /sys/bus/thunderbolt/devices/.../generation
+Date:=09=09Aug 2019
+KernelVersion:=095.5
+Contact:=09Christian Kellner <christian@kellner.me>
+Description:=09This attribute contains the generation of the Thunderbolt
+=09=09controller associated with the device. It will contain 4
+=09=09for USB4.
+
 What: /sys/bus/thunderbolt/devices/.../key
 Date:=09=09Sep 2017
 KernelVersion:=094.13
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 410bf1bceeee..ac9fa2740800 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -1120,6 +1120,15 @@ device_name_show(struct device *dev, struct device_a=
ttribute *attr, char *buf)
 }
 static DEVICE_ATTR_RO(device_name);
=20
+static ssize_t
+generation_show(struct device *dev, struct device_attribute *attr, char *b=
uf)
+{
+=09struct tb_switch *sw =3D tb_to_switch(dev);
+
+=09return sprintf(buf, "%u\n", sw->generation);
+}
+static DEVICE_ATTR_RO(generation);
+
 static ssize_t key_show(struct device *dev, struct device_attribute *attr,
 =09=09=09char *buf)
 {
@@ -1325,6 +1334,7 @@ static struct attribute *switch_attrs[] =3D {
 =09&dev_attr_boot.attr,
 =09&dev_attr_device.attr,
 =09&dev_attr_device_name.attr,
+=09&dev_attr_generation.attr,
 =09&dev_attr_key.attr,
 =09&dev_attr_nvm_authenticate.attr,
 =09&dev_attr_nvm_version.attr,
--=20
2.23.0