mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-20 03:33:20 +09:00
53 lines
1.2 KiB
Plaintext
53 lines
1.2 KiB
Plaintext
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2015 Google Inc.
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*/
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Scope (\_SB)
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{
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/*
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* Chrome EC Keyboard Backlight interface
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*/
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Device (KBLT)
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{
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Name (_HID, "GOOG0002")
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Name (_UID, 1)
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/* Ask EC if we even have a backlight
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* Return 0xf (present, enabled, show in UI, functioning) or 0
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*
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* With older EC codebases that don't support the Device
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* Features bitfield, this reports the keyboard backlight as
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* enabled since reads to undefined addresses in EC address
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* space return 0xff and so KBLE will be 1.
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*/
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Method (_STA, 0, NotSerialized)
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{
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/* If query is unsupported, but this code is compiled
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* in, assume the backlight exists physically.
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*/
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If (LEqual (1, \_SB.PCI0.LPCB.EC0.DFUD)) {
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Return (0xf)
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}
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/* If EC reports that backlight exists, trust it */
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If (LEqual (1, \_SB.PCI0.LPCB.EC0.KBLE)) {
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Return (0xf)
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}
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/* Otherwise: no device -> disable */
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Return (0)
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}
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/* Read current backlight value */
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Method (KBQC, 0, NotSerialized)
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{
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Return (\_SB.PCI0.LPCB.EC0.KBLV)
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}
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/* Write new backlight value */
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Method (KBCM, 1, NotSerialized)
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{
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Store (Arg0, \_SB.PCI0.LPCB.EC0.KBLV)
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}
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}
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}
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