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/*
* This file is part of the coreboot project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 of
* the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
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)
{
/* Windows 2000 and Windows XP call _DOS to enable/disable
* Display Output Switching during init and while a switch
* is already active
*/
Store (And(Arg0, 7), DSEN)
}
/*
* 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)))
}
}
/* Device Current Status */
Method(XDCS, 1)
{
TRAP(1)
If (And(CSTE, ShiftLeft (1, Arg0))) {
Return (0x1f)
}
Return(0x1d)
}
/* Query Device Graphics State */
Method(XDGS, 1)
{
If (And(NSTE, ShiftLeft (1, Arg0))) {
Return(1)
}
Return(0)
}
/* Device Set State */
Method(XDSS, 1)
{
/* If Parameter Arg0 is (1 << 31) | (1 << 30), the
* display switch was completed
*/
If (LEqual(And(Arg0, 0xc0000000), 0xc0000000)) {
Store (NSTE, CSTE)
}
}
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