Hi all, I'm new to linux usb and would like some guidance on achieving some of the following goals. I have a beaglebone black (BBB - currently running kernel v3.12) with OTG in peripheral mode on usb bus#1 and a host port to connect devices on usb bus#2. 1. usb bus#1: connect OTG on BBB as a musb gadget (via gadgetfs) to another PC host (e.g. linux, windows, etc); usb bus#2: connect a hub to BBB host + using libusb to control the hub + relay all traffics from host->musb gadget->libusb->hub->(applicable multiple devices hot-plugged to the hub), and vice versa So far I'm able to see traffics between the PC host and the hub before plugging any device into the hub. That is, usb traffics for endpoints of the hub itself. Once I plug in a device, after certain actions on the hub port, the host will send requests (get_descriptor/set_address) to address 0, which are not forwarded to the gadhetfs user space. I'd like to know: * Are traffics for address 0 visible to musb gadget? What code in usb/musb and/or usb/gadget can be used/revised to retrieve/handle them? * If it is feasible to accomplish the above, then the PC host would enumerate devices plugged into the hub. What code usage/change would be necessary to further retrieve messages addressed to endpoints of individual devices and relay them to the HUB (so the HUB can broadcast to individual devices), and also forward messages from devices received via hub (with libusb) back to host via musb gadget? 2. usb bus#1: connect the BBB OTG to a hub attached to the PC host + using musb gadget if needed: host-hub-OTG-(gadget) + when the host sends any messages to the hub, it would then broadcast (at least for usb2.0) to all ports on the hub. + sniff broadcast traffic on the OTG usb port (on bus#1) I don't necessarily need the OTG gadget to respond anything to the hub or PC host, but hope to sniff all usb messages broadcast by the hub, which means I will be able to see messages sent by the PC host to other devices plugged into the hub. What code in usb/musb and/or usb/gadget can be used/revised to sniff such traffics? I've tried usbmon but it only monitors devices controlled by hcd (on bus#2) not the OTG in peripheral mode (on bus#1) Thanks a lot in advance, Gordon -- 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
