makeUsable
Requests that a device become usable.
Declaration
IOReturn makeUsable(
void );Return Value
A return code that can be ignored by the caller.
Overview
This method is called when some client of a device (or the device's own driver) is asking for the device to become usable. Power management responds by telling the object upon which this method is called to change to its highest power state. makeUsable is implemented using changePowerStateToPriv. Subsequent requests for lower power, such as from changePowerStateToPriv, will pre-empt this request.
See Also
Miscellaneous
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