From b406357c572b29cdcf05f717c69ae0018fa6a146 Mon Sep 17 00:00:00 2001 From: Christian Kellner Date: Thu, 3 Oct 2019 19:32:40 +0200 Subject: 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 Signed-off-by: Mika Westerberg --- drivers/thunderbolt/switch.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/thunderbolt/switch.c') 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_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, -- cgit v1.2.3