Bug 217143

Created attachment 303860 [details]
DSDT table in source

I have a Samsung Galaxy Book 2 Pro 360 which is a model that doesn't have CSM so cannot boot using traditional BIOS. That makes samsung-laptop platform driver useless as there isn't any SABI interface to use. I captured communication between official driver on Windows and ACPI via amli debugger and I can provide information about how the new interface works.

Basically, there is a device called /_SB.SCAI that is used as a version of SABI over ACPI. Dumps shows calls to the CSFI function with buffers near identical to what samsung-laptop would generate if used SABI version 3 taking into account endianess things

There is functions like keyboard backlight that use the same commands as SABI 3 while functions like Protect Battery use non known commands.

/_SB.SCAI has a sizeable amount of methods which I don't know what they do and some features like performance profile use these methods like CSXI which sends a SABI command but with a size of 0x100 bytes.

As last note, I read in the line 40 or around of samsung-laptop.c that maybe somebody had access to a spec of SABI interface and I would like know if somebody knows about that a part of the corresponding mantainer

I will attach dumps of amli about activation of different functions and a copy of the DSDT where appears /_SB.SCAI