e98f6af77b
_DCS, _DGS and _DSS are required by specification. However, we never implemented them properly, and no OS driver com- plained yet. So we stub them out and keep the traditional behavior in case an OS driver checks for their existence. The old implementations also only returned static values as there never was any write to their GNVS variables. The TRAP() that was called in one place is actually implemented by some ThinkPad's SMI handler as docking event. However, as the call precedes these SMI handlers in coreboot history, it's most likely an accident. Change-Id: Ib0b9fcdd58df254d3b2290900e3bc206a7abd92d Signed-off-by: Nico Huber <nico.h@gmx.de> Reviewed-on: https://review.coreboot.org/c/coreboot/+/39726 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
78 lines
1.5 KiB
Plaintext
78 lines
1.5 KiB
Plaintext
/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; version 2 of
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* the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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External(LCD0, DeviceObj)
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Name (BRCT, 0)
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Method(BRID, 1, NotSerialized)
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{
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Store (Match (BRIG, MEQ, Arg0, MTR, Zero, 2), Local0)
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If (LEqual (Local0, Ones))
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{
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Return (Subtract(SizeOf(BRIG), One))
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}
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Return (Local0)
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}
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Method (XBCL, 0, NotSerialized)
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{
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Store (1, BRCT)
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Return (BRIG)
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}
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/* Display Output Switching */
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Method (_DOS, 1)
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{
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}
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/*
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* Decrement display brightness.
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*
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* Using Notify is the right way. But Windows doesn't handle
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* it well. So use both method in a way to avoid double action.
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*/
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Method (DECB, 0, NotSerialized)
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{
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If (BRCT)
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{
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Notify (LCD0, 0x87)
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} Else {
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Store (BRID (XBQC ()), Local0)
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If (LNotEqual (Local0, 2))
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{
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Decrement (Local0)
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}
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XBCM (DerefOf (Index (BRIG, Local0)))
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}
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}
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/*
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* Increment display brightness.
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*/
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Method (INCB, 0, NotSerialized)
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{
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If (BRCT)
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{
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Notify (LCD0, 0x86)
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} Else {
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Store (BRID (XBQC ()), Local0)
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If (LNotEqual (Local0, Subtract(SizeOf(BRIG), One)))
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{
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Increment (Local0)
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}
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XBCM (DerefOf (Index (BRIG, Local0)))
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}
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}
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