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Based on kernel version 3.15.4. Page generated on 2014-07-07 08:59 EST.

1	What:		/sys/devices/.../online
2	Date:		April 2013
3	Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
4	Description:
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.
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