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/Documentation/ABI/obsolete/sysfs-bus-usb

https://bitbucket.org/agherzan/raspberrypi-linux
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 1What:		/sys/bus/usb/devices/.../power/level
 2Date:		March 2007
 3KernelVersion:	2.6.21
 4Contact:	Alan Stern <stern@rowland.harvard.edu>
 5Description:
 6		Each USB device directory will contain a file named
 7		power/level.  This file holds a power-level setting for
 8		the device, either "on" or "auto".
 9
10		"on" means that the device is not allowed to autosuspend,
11		although normal suspends for system sleep will still
12		be honored.  "auto" means the device will autosuspend
13		and autoresume in the usual manner, according to the
14		capabilities of its driver.
15
16		During normal use, devices should be left in the "auto"
17		level.  The "on" level is meant for administrative uses.
18		If you want to suspend a device immediately but leave it
19		free to wake up in response to I/O requests, you should
20		write "0" to power/autosuspend.
21
22		Device not capable of proper suspend and resume should be
23		left in the "on" level.  Although the USB spec requires
24		devices to support suspend/resume, many of them do not.
25		In fact so many don't that by default, the USB core
26		initializes all non-hub devices in the "on" level.  Some
27		drivers may change this setting when they are bound.
28
29		This file is deprecated and will be removed after 2010.
30		Use the power/control file instead; it does exactly the
31		same thing.