USB: Export if an interface driver supports autosuspend.
[linux-2.6.git] / drivers / usb / core / sysfs.c
index 5e1f5d5..f66fba1 100644 (file)
@@ -743,6 +743,29 @@ static ssize_t show_modalias(struct device *dev,
 }
 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 
+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);
+
 static struct attribute *intf_attrs[] = {
        &dev_attr_bInterfaceNumber.attr,
        &dev_attr_bAlternateSetting.attr,
@@ -751,6 +774,7 @@ static struct attribute *intf_attrs[] = {
        &dev_attr_bInterfaceSubClass.attr,
        &dev_attr_bInterfaceProtocol.attr,
        &dev_attr_modalias.attr,
+       &dev_attr_supports_autosuspend.attr,
        NULL,
 };
 static struct attribute_group intf_attr_grp = {