[Letux-kernel] Mainlining of Pyra nub joystick driver
arnd at arndb.de
Tue Jun 14 17:14:52 CEST 2016
On Tuesday, June 14, 2016 2:45:23 PM CEST Andrey Utkin wrote:
> There's a pair of "nub" devices on Pyra handheld PC
> (https://pyra-handheld.com/), and there's driver for nub, which is going
> to be reworked for upstreaming. While the device itself fits most to
> "joystick" category, the computer itself lacks touchpad and mouse
> buttons, and the existing driver is capable of switching between modes, in
> which it shows up like one of the following:
> - scrolling wheel,
> - mouse buttons set,
> - pointer updating its absolute position (graphic pad alike AFAIU),
> - pointer device behaving like actual joystick / pointing stick.
> Currently modes switching happens through r/w file in /proc, which is of
> couse going to be changed.
> I wonder if such mode switching mechanism is tolerable for inclusion to
> upstream kernel in this case. I'd like some advice how to rearrange the
> driver to save most of flexibility while matching upstream kernel
> conventions. I am especially interested in comments from subsystem
My best idea for this is that the device driver should just report one
type of device, with the other modes being handled on top of that,
by a generic kernel framework or in user space.
Code for registering the same inputs to all those frameworks doesn't
seem to belong into a driver.
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