Providing power to an accessory during portable computing device hibernation

摘要

A portable computing device (PCD) can selectively supply power to an accessory during PCD hibernation. In some embodiments, the PCD's default behavior is to disable accessory power output during hibernation, and this default behavior can be overridden in response to a request from a connected accessory. The accessory can use the power supplied during PCD hibernation to detect user input (or other) events and wake the PCD from hibernation in response to a detected event. Some accessories can wake the PCD by emulating accessory detachment and reattachment.

主权项

1. A method of operating an accessory, the method comprising:
establishing a connection to a portable computing device that is external to the accessory; receiving operating power from the portable computing device via the connection; communicating a command from the accessory to the portable computing device indicating that the accessory should continue to receive power from the portable computing device when the portable computing device is in a hibernation mode, wherein communicating a command indicating that the accessory should continue to receive power from the portable computing device when the portable computing device is in the hibernation mode includes specifying a level of power that should be provided to the accessory during the hibernation mode; and while the portable computing device is in the hibernation mode: continuing to receive operating power at the accessory from the portable computing device via the connection in response to the command; detecting, by the accessory, an accessory event; and in response to the accessory event, sending a wake event signal from the accessory to the portable computing device, wherein the wake event signal signals the portable computing device to wake from the hibernation mode.