Hi, Hinko Kocevar <hinkocevar@xxxxxxxxx> writes: > I'm using g_zero and dummy_hcd to test my userspace software dealing > with USB device I currently do not have. > Works great! > But for single g_zero instance ... is it possible to have two g_zero > devices seen in the system? > > Here is what I get: > > # Testing with dummy USB device > > Get kernel sources and compile drivers/usb/gadget/udc/dummy_hcd.ko > > Insert the __dummy_hcd.ko__. > > [1045716.944645] dummy_hcd dummy_hcd.0: USB Host+Gadget Emulator, > driver 02 May 2005 > [1045716.944648] dummy_hcd dummy_hcd.0: Dummy host controller > [1045716.944651] dummy_hcd dummy_hcd.0: new USB bus registered, > assigned bus number 6 > [1045716.944688] usb usb6: New USB device found, idVendor=1d6b, idProduct=0002 > [1045716.944690] usb usb6: New USB device strings: Mfr=3, Product=2, > SerialNumber=1 > [1045716.944691] usb usb6: Product: Dummy host controller > [1045716.944692] usb usb6: Manufacturer: Linux 4.10.0-37-generic dummy_hcd > [1045716.944693] usb usb6: SerialNumber: dummy_hcd.0 > [1045716.944835] hub 6-0:1.0: USB hub found > [1045716.944840] hub 6-0:1.0: 1 port detected > > > Now we can use __g_zero__ to mimic our desired USB device: > > sudo modprobe g_zero idVendor=0x1313 idProduct=0x8089 > iSerialNumber="M00407309" iManufacturer="Hinxx" iProduct="XOXO" > > [1049425.211438] zero gadget: Gadget Zero, version: Cinco de Mayo 2008 > [1049425.211439] zero gadget: zero ready > [1049425.437878] usb 6-1: new high-speed USB device number 4 using dummy_hcd > [1049425.681888] usb 6-1: New USB device found, idVendor=1313, idProduct=8089 > [1049425.681891] usb 6-1: New USB device strings: Mfr=1, Product=2, > SerialNumber=3 > [1049425.681892] usb 6-1: Product: XOXO > [1049425.681894] usb 6-1: Manufacturer: Hinxx > [1049425.681895] usb 6-1: SerialNumber: M00407309 > [1049425.689802] zero gadget: high-speed config #3: source/sink The way dummy was written, it can only instantiate one gadget. You either need a real USB peripheral controller, or you need to patch dummy to instantiate more than one gadget. -- balbi
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