[XL] Change in coreboot[master]: ec/clevo/it5570e: add driver for EC used on various Clevo laptops

[Michael Niewöhner (Code Review)]

Attention is currently required from: Michał Żygowski, Michał Kopeć.

Hello Michał Żygowski, Michał Kopeć,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/68791

to look at the new patch set (#2).

Change subject: ec/clevo/it5570e: add driver for EC used on various Clevo laptops
......................................................................

ec/clevo/it5570e: add driver for EC used on various Clevo laptops

This adds a driver for the ITE IT5570E EC in combination with Clevo
vendor EC firmware. The interface is mostly identical on various laptop
models. Thus, we have implemented one common driver to support them all.

The following features were implemented:
 - Basics like battery, ac, etc.
 - Suspend/hibernate support: S0ix, S3*, S4/S5
 - Save/restore of keyboard backlight level during S0ix without the need
   for Clevo vendor software (ControlCenter)
 - Flexicharger
 - Fn keys (backlight, volume, airplane etc.)
 - Various configuration options via Kconfig / CMOS options

* Note: S3 support works at least on L140CU (Cometlake), but it's not
        enabled for this board because S0ix is used.

Not implemented, yet:
 - Type-C UCSI: the EC firmware seems to be buggy (with vendor fw, too)
 - dGPU support is WIP

An example of how this driver can be hooked up by a board can be seen in
the follow-up patch, where support for the L140MU is added.

Known issue with the touchpad toggle:
The touchpad toggle (Fn-F1) has two modes, Ctrl-Alt-F9 mode and keycodes
0xf7/0xf8 mode. Ctrl-Alt-F9 is the native touchpad toggle shortcut on
Windows. On Linux this would switch to virtual console 9, if enabled.
Thus, one should use the keycodes mode and add udev rules as specified in
https://docs.dasharo.com/variants/clevo_nv41/post_install/ .
If VT9 is disabled, Ctrl-Alt-F9 mode could be used to set up a keyboard
shortcut command toggling the touchpad.

Testing the various functionalities of this EC driver was done in the
changes hooking up this driver for the boards.

Change-Id: Ic8c0bee9002ad9edcd10c83b775fc723744caaa0
Co-authored-by: Michał Kopeć 
Co-authored-by: Michał Żygowski 
Co-authored-by: Michael Niewöhner 
Signed-off-by: Michał Kopeć 
Signed-off-by: Michał Żygowski 
Signed-off-by: Michael Niewöhner 
---
A src/ec/clevo/it5570e/Kconfig
A src/ec/clevo/it5570e/Makefile.inc
A src/ec/clevo/it5570e/acpi/ac.asl
A src/ec/clevo/it5570e/acpi/battery.asl
A src/ec/clevo/it5570e/acpi/buttons.asl
A src/ec/clevo/it5570e/acpi/common.asl
A src/ec/clevo/it5570e/acpi/ec.asl
A src/ec/clevo/it5570e/acpi/ec_queries.asl
A src/ec/clevo/it5570e/acpi/ec_ram.asl
A src/ec/clevo/it5570e/acpi/hid.asl
A src/ec/clevo/it5570e/acpi/lid.asl
A src/ec/clevo/it5570e/chip.h
A src/ec/clevo/it5570e/commands.c
A src/ec/clevo/it5570e/commands.h
A src/ec/clevo/it5570e/early_init.c
A src/ec/clevo/it5570e/early_init.h
A src/ec/clevo/it5570e/ec.c
A src/ec/clevo/it5570e/ec.h
A src/ec/clevo/it5570e/i2ec.c
A src/ec/clevo/it5570e/i2ec.h
A src/ec/clevo/it5570e/smbios.c
A src/ec/clevo/it5570e/smihandler.c
A src/ec/clevo/it5570e/smm.h
A src/ec/clevo/it5570e/ssdt.c
24 files changed, 2,065 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/91/68791/2