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USB: USB 3.2 Add sysfs entries for a usb device rx_lanes and tx_lanes 

Add rx_lanes and tx_lanes lane count sysfs entries for a usb device
struct usb_devuce rx_lanes and tx_lanes variables.

Shows number of lanes used by the usb device

Data rate of a device is the lane speed * lane count, for example
USB 3.2 Gen 2x2 device uses 10Gbps signaling per lane, and has dual-lane
support 10Gbps * 2 = 20Gbps

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2018-04-19 19:05:54 +03:00 committed by Greg Kroah-Hartman
parent 45455e4d7a
commit 460fd21618
1 changed files with 22 additions and 0 deletions
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22
drivers/usb/core/sysfs.c
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@ -175,6 +175,26 @@ static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
} }
static DEVICE_ATTR_RO(speed); static DEVICE_ATTR_RO(speed);
static ssize_t rx_lanes_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct usb_device *udev;
udev = to_usb_device(dev);
return sprintf(buf, "%d\n", udev->rx_lanes);
}
static DEVICE_ATTR_RO(rx_lanes);
static ssize_t tx_lanes_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct usb_device *udev;
udev = to_usb_device(dev);
return sprintf(buf, "%d\n", udev->tx_lanes);
}
static DEVICE_ATTR_RO(tx_lanes);
static ssize_t busnum_show(struct device *dev, struct device_attribute *attr, static ssize_t busnum_show(struct device *dev, struct device_attribute *attr,
char *buf) char *buf)
{ {
@ -790,6 +810,8 @@ static struct attribute *dev_attrs[] = {
&dev_attr_bNumConfigurations.attr, &dev_attr_bNumConfigurations.attr,
&dev_attr_bMaxPacketSize0.attr, &dev_attr_bMaxPacketSize0.attr,
&dev_attr_speed.attr, &dev_attr_speed.attr,
&dev_attr_rx_lanes.attr,
&dev_attr_tx_lanes.attr,
&dev_attr_busnum.attr, &dev_attr_busnum.attr,
&dev_attr_devnum.attr, &dev_attr_devnum.attr,
&dev_attr_devpath.attr, &dev_attr_devpath.attr,