@manuelbl, I will answer your question here, due as new user I cannot post more than three replies in the same topic.
$ ls -l /Library/Extensions/*USB*
ls: /Library/Extensions/*USB*: No such file or directory
$ ls -l /System/Library/Extensions/*USB*
/System/Library/Extensions/AppleMIDIUSBDriver.plugin:
/System/Library/Extensions/AppleOSXUSBNCM.kext:
/System/Library/Extensions/AppleUSBACM.kext:
/System/Library/Extensions/AppleUSBAudio.kext:
/System/Library/Extensions/AppleUSBCDC.kext:
/System/Library/Extensions/AppleUSBCommon.kext:
/System/Library/Extensions/AppleUSBDMM.kext:
/System/Library/Extensions/AppleUSBDisplays.kext:
/System/Library/Extensions/AppleUSBECM.kext:
/System/Library/Extensions/AppleUSBEEM.kext:
/System/Library/Extensions/AppleUSBEthernet.kext:
/System/Library/Extensions/AppleUSBEthernetHost.kext:
/System/Library/Extensions/AppleUSBFTDI.kext:
/System/Library/Extensions/AppleUSBMultitouch.kext:
/System/Library/Extensions/AppleUSBNCM.kext:
/System/Library/Extensions/AppleUSBNetworking.kext:
/System/Library/Extensions/AppleUSBSerial.kext:
/System/Library/Extensions/AppleUSBTopCase.kext:
/System/Library/Extensions/AppleUSBWCM.kext:
/System/Library/Extensions/AppleUSBiBridge.kext:
/System/Library/Extensions/IOUSBAttachedSCSI.kext:
/System/Library/Extensions/IOUSBFamily.kext:
/System/Library/Extensions/IOUSBHostFamily.kext:
/System/Library/Extensions/IOUSBMassStorageClass.kext:
/System/Library/Extensions/IOUSBMassStorageDriver.kext: