Patent ID: 8880909
Filing Date: 2014-11-04
Classification: G06F

Abstract:
1. A method for providing power to a USB client device and polling for a correct protocol comprising: supplying power from a USB host device to the USB client device in a low current mode; providing a first part of a first handshake from a USB host device to the USB client device, the first handshake determined by a first protocol; monitoring the USB client device by the USB host device for a second part of the first handshake, where the second part of the first handshake includes one of a predetermined response and no response to the first part of the first handshake; recognizing that power may be supplied from the USB host device to the USB client device according to the first protocol when the second part of the first handshake is received by the USB host device; if and only if the first handshake is not satisfied, providing a first part of a second handshake from the USB host device to the USB client device after the second part of the first handshake is not received by the USB host device, the second handshake determined by a second protocol; recognizing that power may be supplied from the USB host device to the USB client device according to the second protocol when a second part of the second handshake is received by the USB host device.