https://stackoverflow.com/questions/20902876
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RussianA user-space device driver is a piece of software (a library or a daemon) that is used to get access to a custom device (a gadget). The difference with a kernel driver is that the user-space driver is run from the normal user-space, not from the kernel. That is, it is compiled and run as normal code just as any other program/library.
In order to do this, you need to access the low-level USB features from your program, but the Linux kernel gently provides that. Anyway, do not try to talk to the kernel directly, that is madness. Instead use a USB library, such as libusb
