On Tuesday 09 June 2020 00:26:45 mario.limoncie...@dell.com wrote: > > Mario, are you able to get some official documentation for these 0x0012 > > event types? I think it could be really useful for community so they can > > understand and add easily new type of code and events. Because currently > > we are just guessing what it could be. (It is sequence? Or single event? > > Or single event with extended data? It is generic event? Or it is real > > keypress? etc...) > > It's a single event with more data in the subsequent words. It is definitely > not a real keypress. It's supposed to be data that a user application would > show. > > Remember the way WMI works on Linux and Windows is different. On Windows > userland applications get the events directly. On Linux kernel drivers get > the > events and either use it internally, pass to another kernel driver or pass to > userland in the form of a translated event. > > So on Windows the whole buffer gets looked at directly by the application and > the > application will decode it to show a translated string. > > I can certainly discuss internally about our team releasing a patch to export > all these other events. I would like to know what interface to recommend it > pass > to userspace though, because as I said this is more than just a keycode that > comes through in the event. It's not useful to just do dev_info, it really > should > be something that userspace can act on and show a translated message. > I don't think we want to add another 15 Dell specific keycodes to the kernel > for the > various events and add another 4 more when a laptop introduces another set of > keys.
Which interface to use for events? That is a good question and probably this should be bring to the linux-input mailinglist. I think that linux-input maintainers could have idea how to do it properly. We need some interface which would be general enough and usable also by other drivers / components and I'm sure that ACPI/WMI is not the only subsystem which needs to send events from kernel to userspace.
