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Commit | Line | Data |
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4f3549d7 RW |
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. |