| 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. |