Re: what binds to port
On Mon 16 Aug 2021 at 19:51:50 +0200, Nicolas George wrote:
> Brian (12021-08-02):
> > My thinking is that a USB printer uses libusb, just as a scanner does.
> > No kernel driver involved. The printer drivers are "internal" to CUPS.
>
> The output of `/sbin/modinfo usblp` confirms there is a kernel driver
> for USB printers.
>
> filename: /lib/modules/5.10.0-8-amd64/kernel/drivers/usb/class/usblp.ko
> license: GPL
> description: USB Printer Device Class driver
> author: Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete Zaitcev, David Paschal
The existence of the usblp kernel module is not in doubt.
> It is entirely possible that both this and generic libusb access are
> supported.
The printing system detaches usblp when it is met.
--
Brian.
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