Code:
[root@kindle root]# ls -l /lib/modules/$(uname -r)/kernel/drivers/usb/
drwxr-xr-x 2 root root 1024 Jan 16 2017 gadget
[root@kindle root]# cd gadget
-sh: cd: can't cd to gadget
[root@kindle root]# ls -l /lib/modules/$(uname -r)/kernel/drivers/usb/gadget
-rw-r--r-- 1 root root 130046 Jan 16 2017 g_android.ko
-rw-r--r-- 1 root root 42904 Jan 16 2017 g_ether.ko
-rw-r--r-- 1 root root 42534 Jan 16 2017 g_mass_storage.ko
-rw-r--r-- 1 root root 43696 Jan 16 2017 libcomposite.ko
-rw-r--r-- 1 root root 15116 Jan 16 2017 u_serial.ko
-rw-r--r-- 1 root root 9874 Jan 16 2017 usb_f_acm.ko
[root@kindle root]#