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>

diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index 27bb340..ea18284 100644 (file)
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -175,6 +175,26 @@ static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
 }
 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,
                           char *buf)
 {
@@ -790,6 +810,8 @@ static struct attribute *dev_attrs[] = {
        &dev_attr_bNumConfigurations.attr,
        &dev_attr_bMaxPacketSize0.attr,
        &dev_attr_speed.attr,
+       &dev_attr_rx_lanes.attr,
+       &dev_attr_tx_lanes.attr,
        &dev_attr_busnum.attr,
        &dev_attr_devnum.attr,
        &dev_attr_devpath.attr,