+static ssize_t show_supports_autosuspend(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf;
+ struct usb_device *udev;
+ int ret;
+
+ intf = to_usb_interface(dev);
+ udev = interface_to_usbdev(intf);
+
+ usb_lock_device(udev);
+ /* Devices will be autosuspended even when an interface isn't claimed */
+ if (!intf->dev.driver ||
+ to_usb_driver(intf->dev.driver)->supports_autosuspend)
+ ret = sprintf(buf, "%u\n", 1);
+ else
+ ret = sprintf(buf, "%u\n", 0);
+ usb_unlock_device(udev);
+
+ return ret;
+}
+static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
+