When a driver challenges the kernel's assumptions

(miod.online.fr)

45 points | by todsacerdoti 6 hours ago

3 comments

  • Ericson2314 4 hours ago
    > The answer was as unhelpful as possible

    Uh I think I think that's way too mean to the email. From a random web form they got some technical information, a useful CC, and offer to have a call. Not bad at all!

    Also, my basic theory about hardware problems is that the problem is less that they won't share the docs, and more that even the internal docs suck. When you essentially co-evolve devices and software through many revisions of each over many years, it's easy to get a complete mess that nobody understands.

    (Of course, in this specific case, DisplayLink was new, so it's maybe less of a problem.)

    • saagarjha 3 hours ago
      I think they’re upset that the library was to be released under LGPL or whatever, even though they clearly went and read from it anyway when implementing their thing.
      • kimixa 2 hours ago
        It seems they're pretty directly admitting to referring to the LGPL library while implementing theirs under a different license.

        I wonder if they'll have no issues with people directly reading their code while happening to implement the same functionality with a closed license? Or a GPL-style one?

        I'm surprised they admitted to it - it's hardly "Clean Room"....

  • shmerl 2 hours ago
    > The answer was as unhelpful as possible

    Looking at the answer, I wouldn't call it unhelpful. They were planning to release a source for the library that would essentially implement all the needed data interfaces? That's more than helpful and at least they responded.

    I tried contacting Nuvoton for example about their documentation for some of their super I/O chips which lack Linux support (they do document a bunch of their chips pretty well, but for some weird reason not all).

    Not only I got no details, I literally didn't even get a response from them at all. So above case is hugely better.

    • heavyset_go 1 hour ago
      Go through the Linux Foundation, they have a process for accessing docs for drivers that vendors normally require NDAs with established businesses for, and won't offer random people.
      • shmerl 1 hour ago
        If they require an NDA, they'll probably refuse to provide it for the purpose of Linux drivers?

        Unless it's just some dumb formality. I can try Linux Foundation.

        • heavyset_go 1 hour ago
          Yeah it depends on their stance, some vendors just want an entity that can be bound by contract and they could theoretically sue if you leak their docs, and the Linux Foundation can serve that role.

          More info here: https://www.linuxfoundation.org/legal/nda

          • shmerl 58 minutes ago
            Thanks for the pointer!
  • darig 2 hours ago
    [dead]