[v2,5/6] USB: USB 3.2 Add sysfs entries for a usb device rx_lanes and tx_lanes

Commit Message

Mathias Nyman April 19, 2018, 4:05 p.m. UTC

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 <[e-mail]>
---
 drivers/usb/core/sysfs.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

Patch

diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index 27bb340..ea18284 100644
--- 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,