On 15/04/2021 16:44, Greg KH wrote:
Why do you need a kernel driver at all? Why not just use the userspace hid access and control stuff that way from an application? > If you write your own driver, you can do that from within the driver I think. But again, what's wrong with userspace?
thanks,
greg k-h
A couple reasons. These might be misplaced since I'm very new to kernel programming. I would like to create very simple user space scripts and programs on top of it. I'd like to change settings with nothing more than an `echo 200 > brightness`. Something has to keep track of an internal state, which I'd rather not happen in userspace apps, so I decided on a driver. I'd like to eventually use linux/backlight.h to control brightness which, correct me if I'm wrong, has to be used from a kernel driver. Or is this an unsuitable use case? I assume you are referring to uhid? I've got no issue using it but my initial impressions led me to think it wouldn't have been as elegant. Again I could be wrong. I'll do some more research on it. Thanks Mark