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 executed successfully. 21