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