The drivers are legally required to be, well not published, but the source sent to anyone who asks.
Plenty of drivers are proprietary. There are many ways of doing so, like much of it can exist in userspace, or in firmware, or using a shim in the kernel.
alt Hacker News
Plenty of drivers are proprietary. There are many ways of doing so, like much of it can exist in userspace, or in firmware, or using a shim in the kernel.