| Rafael J. Wysocki | 4f3549d | 2013-05-02 22:15:29 +0200 | [diff] [blame] | 1 | What: /sys/devices/.../online |
| 2 | Date: April 2013 |
| 3 | Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
| 4 | Description: |
| 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 exeucted successfully. |