1What:		/sys/devices/.../online
2Date:		April 2013
3Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
4Description:
5		The /sys/devices/.../online attribute is only present for
6		devices whose bus types provide .online() and .offline()
7		callbacks.  The number read from it (0 or 1) reflects the value
8		of the device's 'offline' field.  If that number is 1 and '0'
9		(or 'n', or 'N') is written to this file, the device bus type's
10		.offline() callback is executed for the device and (if
11		successful) its 'offline' field is updated accordingly.  In
12		turn, if that number is 0 and '1' (or 'y', or 'Y') is written to
13		this file, the device bus type's .online() callback is executed
14		for the device and (if successful) its 'offline' field is
15		updated as appropriate.
16
17		After a successful execution of the bus type's .offline()
18		callback the device cannot be used for any purpose until either
19		it is removed (i.e. device_del() is called for it), or its bus
20		type's .online() is exeucted successfully.
21