Hi , Are there any userspace interfaces implemented in usbfs/sysfs or any ioctls through which it is possible to read usb host controller operational registers value (for eg PORTSC ) at any specified instant . Also are there any usb host apis through which host controller register values can be read ? Regards Amit Nagal -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html