mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-19 19:23:21 +09:00
4d0c5762ad
Add ASL files for the Chrome OS EC, taken from coreboot. Signed-off-by: Simon Glass <sjg@chromium.org>
53 lines
1.2 KiB
Plaintext
53 lines
1.2 KiB
Plaintext
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2015 Google Inc.
|
|
*/
|
|
|
|
Scope (\_SB)
|
|
{
|
|
/*
|
|
* Chrome EC Keyboard Backlight interface
|
|
*/
|
|
Device (KBLT)
|
|
{
|
|
Name (_HID, "GOOG0002")
|
|
Name (_UID, 1)
|
|
|
|
/* Ask EC if we even have a backlight
|
|
* Return 0xf (present, enabled, show in UI, functioning) or 0
|
|
*
|
|
* With older EC codebases that don't support the Device
|
|
* Features bitfield, this reports the keyboard backlight as
|
|
* enabled since reads to undefined addresses in EC address
|
|
* space return 0xff and so KBLE will be 1.
|
|
*/
|
|
Method (_STA, 0, NotSerialized)
|
|
{
|
|
/* If query is unsupported, but this code is compiled
|
|
* in, assume the backlight exists physically.
|
|
*/
|
|
If (LEqual (1, \_SB.PCI0.LPCB.EC0.DFUD)) {
|
|
Return (0xf)
|
|
}
|
|
/* If EC reports that backlight exists, trust it */
|
|
If (LEqual (1, \_SB.PCI0.LPCB.EC0.KBLE)) {
|
|
Return (0xf)
|
|
}
|
|
/* Otherwise: no device -> disable */
|
|
Return (0)
|
|
}
|
|
|
|
/* Read current backlight value */
|
|
Method (KBQC, 0, NotSerialized)
|
|
{
|
|
Return (\_SB.PCI0.LPCB.EC0.KBLV)
|
|
}
|
|
|
|
/* Write new backlight value */
|
|
Method (KBCM, 1, NotSerialized)
|
|
{
|
|
Store (Arg0, \_SB.PCI0.LPCB.EC0.KBLV)
|
|
}
|
|
}
|
|
}
|