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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
External(LCD0, DeviceObj)
Name (BRCT, 0)
Method(BRID, 1, NotSerialized)
{
Store (Match (BRIG, MEQ, Arg0, MTR, Zero, 2), Local0)
If (LEqual (Local0, Ones))
{
Return (Subtract(SizeOf(BRIG), One))
}
Return (Local0)
}
Method (XBCL, 0, NotSerialized)
{
Store (1, BRCT)
Return (BRIG)
}
/* Display Output Switching */
Method (_DOS, 1)
{
}
/*
* Decrement display brightness.
*
* Using Notify is the right way. But Windows doesn't handle
* it well. So use both method in a way to avoid double action.
*/
Method (DECB, 0, NotSerialized)
{
If (BRCT)
{
Notify (LCD0, 0x87)
} Else {
Store (BRID (XBQC ()), Local0)
If (LNotEqual (Local0, 2))
{
Decrement (Local0)
}
XBCM (DerefOf (Index (BRIG, Local0)))
}
}
/*
* Increment display brightness.
*/
Method (INCB, 0, NotSerialized)
{
If (BRCT)
{
Notify (LCD0, 0x86)
} Else {
Store (BRID (XBQC ()), Local0)
If (LNotEqual (Local0, Subtract(SizeOf(BRIG), One)))
{
Increment (Local0)
}
XBCM (DerefOf (Index (BRIG, Local0)))
}
}
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