Accessory power management

摘要

A computing device, comprising:
an interface configured to electrically couple to a cable; and
a power managing element coupled to the interface to:
establish a connection with a power source via the cable;
receive an indication that the power source can supply current at a first level;
receive an indication that the cable can supply current at a lower, second level; and
draw a current having a limit equal to the lower second level.