On Mon, Aug 11, 2014 at 5:28 PM, Peter Chen <Peter.Chen@xxxxxxxxxxxxx> wrote: > The OTG FSM at /usb/common/usb-otg-fsm.c is a software OTG FSM implementation > which follows On-The-Go and Embedded Host Supplement to the USB Revision 2.0 Specification > (Revision 2.0 version 1.1a) Chapter 7 State Diagrams. > > If the platform doesn't support hardware otg fsm, it should follow above fsm implementation since > it follows the newest OTG & EH spec. Besides, as far as I know, the qualcomm uses > chipidea core for its usb2, then it should be easy for qualcomm using this common > otg fsm implementation. OK. sounds good. Yes, the qualcomm chips use a chipidea core for usb2. The main difficulty, IMHO, will be mapping the qcom charger state machine onto the generic OTG state machine implementation in usb-otg-fsm. I'm not sure if I'll be able to embed the needed functionality into the existing functions called by the generic state machine, or if I'll need to add some new entries to the function table to handle this extra logic. I'll probably try to get the driver working without the charger stuff first, and then, once I have a better idea of how the state machines map, try adding the charger stuff. If I feel like I need to modify the generic state machine, I'll ask on list. I'm a newbie at USB stuff and I don't want to break anything. Thanks. -- Tim Bird Senior Software Engineer, Sony Mobile Architecture Group Chair, CE Workgroup, Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
