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1What: /sys/devices/.../online2Date: April 20133Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>4Description:5 The /sys/devices/.../online attribute is only present for6 devices whose bus types provide .online() and .offline()7 callbacks. The number read from it (0 or 1) reflects the value8 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's10 .offline() callback is executed for the device and (if11 successful) its 'offline' field is updated accordingly. In12 turn, if that number is 0 and '1' (or 'y', or 'Y') is written to13 this file, the device bus type's .online() callback is executed14 for the device and (if successful) its 'offline' field is15 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 either19 it is removed (i.e. device_del() is called for it), or its bus20 type's .online() is executed successfully.21