USB: add power/level sysfs attribute

This patch (as874) adds another piece to the user-visible part of the
USB autosuspend interface.  The new power/level sysfs attribute allows
users to force the device on (with autosuspend off), force the device
to sleep (with autoresume off), or return to normal automatic operation.

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

diff --git a/include/linux/usb.h b/include/linux/usb.h
index cc24d08..5e8e144 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -398,6 +398,8 @@
 
 	unsigned auto_pm:1;		/* autosuspend/resume in progress */
 	unsigned do_remote_wakeup:1;	/* remote wakeup should be enabled */
+	unsigned autosuspend_disabled:1; /* autosuspend and autoresume */
+	unsigned autoresume_disabled:1;  /*  disabled by the user */
 #endif
 };
 #define	to_usb_device(d) container_of(d, struct usb_device, dev)