On Wed, Apr 12, 2017 at 06:18:20PM +0530, Niranjan Dighe wrote: > > Hi Niranjan, > > > > When working with iAP device, there are two role-switch methods > > - Through OTG FSM, and using sysfs entries under > > /sys/bus/platform/devices/ci_hdrc.0/inputs > > but you may need to patch code to keep vbus always on for A-device, > > it is not compliance with OTG spec. > > - Using role interface under debugfs (I move it under sysfs for v4.12). > > But you need to patch the code and let the A-device switch back to > > host after iAP is disconnected. > > > > You don't need to use above two methods together, I suggest using the > > 2nd method since OTG FSM is hard to maintain due to no mandatory use > > case for it. > > > > -- > > > > Best Regards, > > Peter Chen > > Thank you Peter for your response. > > Yes, I will try to switch the role on disconnection of iAP device to Host. If > I understand correctly I have to do something like this - > > ci_role_stop(ci); //Gadget role stop > ret = ci_role_start(ci, role); //Host role start > Applying below patch [1] first. - When your app detects the board needs to switch role to gadget, do echo gadget > /sys/bus/platform/devices/ci_hdrc.0/role - When your app detects the iAP devices is disconnected from the board, do echo host > /sys/bus/platform/devices/ci_hdrc.0/role [1] https://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb.git/commit/?h=ci-for-usb-next -- Best Regards, Peter Chen -- 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
