undefined reference to `usb_add_gadget_udc' while building GadgetFS as module

[azmathmoosa]

I am trying to build with support for GadgetFS. I tried to build it inside the kernel (using *) and it successfully builds, but when trying to mount using it, a runtime error occurs and it fails to mount.

So I tried to make it as a module but the build fails with the above error.

In function `sunxi_udc_probe_otg':
/work/12_Kyloren/13_NanoPi/Debian/lichee/linux-3.4/drivers/usb/sunxi_usb/udc/sunxi_udc.c:3004: undefined reference to `usb_add_gadget_udc'
make: *** [.tmp_vmlinux1] Error 1

My menuconfig is as follows

<*> USB support
     [*] USB runtime power management (autosuspend) and wakeup
     [*]    OTG support
    <M> USB Gadget support -->
            [*] softwinner sunxi usb peripheral controller
            <M> Gadget filesystem
            <M> Mass Storage Gadget
     <*> sunxi usb2.0 dual role controller support -->
           <*> SUNXI usb2 manager
                  USB2 controller support (otg support) -->
          <*> SunXi USB driver debug message
          <*> SunXi USB HOST driver

I tried this configuration as well, but then the build fails with undefined reference usb_hcd_**

<*> USB support
     [*] USB runtime power management (autosuspend) and wakeup
     [*]    OTG support
    <M> USB Gadget support -->
            [*] softwinner sunxi usb peripheral controller
            <M> Gadget filesystem
            <M> Mass Storage Gadget
     <M> sunxi usb2.0 dual role controller support -->
           <M> SUNXI usb2 manager
                  USB2 controller support (otg support) -->
          <M> SunXi USB driver debug message
          <M> SunXi USB HOST driver

Please let me know how to get around this.

BTW: This is for the board with AllWinner H3

[azmathmoosa]

I managed to build with this

<*> USB support
     [*] USB runtime power management (autosuspend) and wakeup
     [*]    OTG support
    **<*>** USB Gadget support -->
            [*] softwinner sunxi usb peripheral controller
            <M> Gadget filesystem
            <M> Mass Storage Gadget
     <*> sunxi usb2.0 dual role controller support -->
           <*> SUNXI usb2 manager
                  USB2 controller support (otg support) -->
          <*> SunXi USB driver debug message
          <*> SunXi USB HOST driver

However, on mounting I get this (the same runtime error when I make gadgetfs in-built)

root@kyloren:/dev$ # modprobe gadgetfs
[  283.295807] gadgetfs: USB Gadget filesystem, version 24 Aug 2004
root@kyloren:/dev$ # 
root@kyloren:/dev$ # mkdir /dev/gadget  
root@kyloren:/dev$ # mount -t gadgetfs gadgetfs /dev/gadget  
[  302.459138] WRN:L2558(drivers/usb/sunxi_usb/udc/sunxi_udc.c):ERR: Error in bind() : -120
[  302.478543] nop sunxi_usb_udc: failed to start (null): -120