On Wed, May 18, 2022 at 10:04:14PM +0000, Matt Silva wrote: > Hi, Greg. Thanks for the response, I really appreciate it! Awesome to get a reply from the man himself. > > Probably wasn't the best from me to refer to the Windows software as a driver. As far as I can tell it > is just a userspace application using the Windows interface to communicate, as you described below. > > From my understanding, the device intends to operate as a HID device (unless your comment below about > all devices claiming to be HID when they're not on Windows applies here), it even provides a HID descriptor > with usages to Windows. It's also my understanding that for certain devices with "quirks" that don't > operate normally, the Linux kernel has quirks that allow these edge case devices to operate as intended. But this really is not a HID device, right? What is the HID descriptor that it prints out? Can you use the 'usbhid-dump' program that is part of the usbutils package to show the report descriptors? > So while your feedback about using libusb for OpenRGB in userspace definitely doable, I was curious if this device > would benifit from having support for its quirk added to the kernel so that it can be exposed in userspace > as it intends, rather than just solving my specific problem for OpenRGB. As far as I can tell, the > interface never communicated to directly through its single OUT endpoint. The communication is through > the control endpoint via a SET REPORT request. I did some reading and you are correct, HID class > interfaces require a interrupt in endpoint. But like I said, the fact that it only communicates via the > control endpoint made me think that maybe this requirement may not be necessary for the interface > to function as intended. If this is all going through a "fake" SET REPORT command, in a vendor-specific way, I would just recommend doing it all from userspace using libusb like OpenRGB does for other devices. No need to mess with the kernel at all for a fake HID device like this. good luck! greg k-h _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
