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