Hi everyone, I made a very simple USB driver , but the problem is that the probe and disconnect functions never was called. I tried to google for this problem but unfortunately: 1- I don't use usb-storage , it's a keyboard! (but anyway the same problem exists with any usb-based device) and all driver on my machine are bluetooth related drive (i think!) (as you see from lsmod | grep usb) 2- I tried to rmmod usbhid but I get error: ERROR: Module usbhid is builtin. I tried to search for "usbhid" in .config file to remove it but I didn't find anything. What should I do? thanks, smalinux [root@hp kernel_mod]# lsmod | grep usb sma_usb 16384 0 btusb 57344 0 btrtl 24576 1 btusb btbcm 20480 1 btusb btintel 32768 1 btusb bluetooth 634880 34 btrtl,btintel,btbcm,bnep,ath3k,btusb,rfcomm I use : - Linux hp 5.6.3 #2 SMP Fri Apr 10 06:45:27 EET 2020 x86_64 x86_64 x86_64 GNU/Linux - Linux buildroot 5.4.3-gf7688b48a-dirty #1 SMP Thu Jan 1 00:00:00 UTC 1970 x86_64 GNU/Linux