1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index f9e4445d5b53..cfbd2bb8fa2c 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -398,6 +398,7 @@ struct usb_device {
         struct delayed_work autosuspend; /* for delayed autosuspends */
         struct mutex pm_mutex;          /* protects PM operations */
 
+        unsigned long last_busy;        /* time of last use */
         int autosuspend_delay;          /* in jiffies */
 
         unsigned auto_pm:1;             /* autosuspend/resume in progress */
@@ -443,6 +444,11 @@ static inline void usb_autopm_disable(struct usb_interface *intf)
         usb_autopm_set_interface(intf);
 }
 
+static inline void usb_mark_last_busy(struct usb_device *udev)
+{
+        udev->last_busy = jiffies;
+}
+
 #else
 
 static inline int usb_autopm_set_interface(struct usb_interface *intf)
@@ -457,6 +463,8 @@ static inline void usb_autopm_enable(struct usb_interface *intf)
 { }
 static inline void usb_autopm_disable(struct usb_interface *intf)
 { }
+static inline void usb_mark_last_busy(struct usb_device *udev)
+{ }
 #endif
 
 /*-------------------------------------------------------------------------*/