On Sat, May 6, 2017 at 3:45 PM, Michał Kępień <kernel@xxxxxxxxxx> wrote: > To be fair, one thing that may be "unnatural" with this approach is that > even though fujitsu-backlight would depend on fujitsu-laptop, it would > still have to get a handle to FUJ02E3 using: > > acpi_get_handle(NULL, "\\_SB.FEXT", ...) > > because call_fext_func() - and thus fext_backlight() - needs to be > passed a handle to FUJ02E3 and the two ACPI devices (FUJ02B1 handled by > fujitsu-backlight and FUJ02E3 handled by fujitsu-laptop) are not related > from the perspective of the ACPI device hierarchy. Unless there is a > better way of implementing this, in which case I am open to suggestions. There are two areas to check with: 1. Remote graph node https://lwn.net/Articles/718184/ 2. Component framework (only works in case when all devices are mandatory to have). -- With Best Regards, Andy Shevchenko
