USB: add "busnum" attribute for USB devices

This patch (as903) adds a "busnum" sysfs attribute for USB devices.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index 2ea47a38aefa..e7c982377488 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -118,6 +118,16 @@ show_speed(struct device *dev, struct device_attribute *attr, char *buf)
 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
 
 static ssize_t
+show_busnum(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct usb_device *udev;
+
+        udev = to_usb_device(dev);
+        return sprintf(buf, "%d\n", udev->bus->busnum);
+}
+static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL);
+
+static ssize_t
 show_devnum(struct device *dev, struct device_attribute *attr, char *buf)
 {
         struct usb_device *udev;
@@ -347,6 +357,7 @@ static struct attribute *dev_attrs[] = {
         &dev_attr_bNumConfigurations.attr,
         &dev_attr_bMaxPacketSize0.attr,
         &dev_attr_speed.attr,
+        &dev_attr_busnum.attr,
         &dev_attr_devnum.attr,
         &dev_attr_version.attr,
         &dev_attr_maxchild.attr,