1. 根目录:
2. drivers
3. usb
4. gadget
5. Makefile

#
# USB peripheral controller drivers
#
subdir-ccflags-$(CONFIG_USB_GADGET_DEBUG)	:= -DDEBUG
subdir-ccflags-$(CONFIG_USB_GADGET_VERBOSE)	+= -DVERBOSE_DEBUG
ccflags-y				+= -I$(srctree)/drivers/usb/gadget/udc

obj-$(CONFIG_USB_LIBCOMPOSITE)	+= libcomposite.o
libcomposite-y			:= usbstring.o config.o epautoconf.o
libcomposite-y			+= composite.o functions.o configfs.o u_f.o

g_android-y			:= android.o

obj-$(CONFIG_USB_GADGET)	+= udc/ function/ legacy/

obj-$(CONFIG_USB_G_ANDROID)	+= g_android.o