21 lines
1008 B
Plaintext
21 lines
1008 B
Plaintext
|
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.
|