// Adding PNLF device for WhateverGreen.kext and others.
// This is a modified PNLF version originally taken from RehabMan/OS-X-Clover-Laptop-Config repository:
// https://raw.githubusercontent.com/RehabMan/OS-X-Clover-Laptop-Config/master/hotpatch/SSDT-PNLF.dsl
// Rename GFX0 to anything else if your IGPU name is different.
//
// Licensed under GNU General Public License v2.0
// https://github.com/RehabMan/OS-X-Clover-Laptop-Config/blob/master/License.md

#define FBTYPE_SANDYIVY 1
#define FBTYPE_HSWPLUS 2
#define FBTYPE_CFL 3

#define SANDYIVY_PWMMAX 0x710
#define HASWELL_PWMMAX 0xad9
#define SKYLAKE_PWMMAX 0x56c
#define CUSTOM_PWMMAX_07a1 0x07a1
#define CUSTOM_PWMMAX_1499 0x1499
#define COFFEELAKE_PWMMAX 0xffff

DefinitionBlock("", "SSDT", 2, "ACDT", "PNLF", 0)
{
    External(RMCF.BKLT, IntObj)
    External(RMCF.LMAX, IntObj)
    External(RMCF.LEVW, IntObj)
    External(RMCF.GRAN, IntObj)
    External(RMCF.FBTP, IntObj)
    External(_SB_.PCI0.GFX0, DeviceObj)
    
    If (_OSI ("Darwin")) {
        Scope (\_SB.PCI0.GFX0)
        {
            OperationRegion (RMP3, PCI_Config, Zero, 0x14)

            // For backlight control
            Device(PNLF)
            {
             // Name(_ADR, Zero)
                Name(_HID, EisaId("APP0002"))
                Name(_CID, "backlight")
                // _UID is set depending on PWMMax to match profiles in WhateverGreen.kext https://github.com/acidanthera/WhateverGreen/blob/1.4.7/WhateverGreen/kern_weg.cpp#L32
                // 14: Sandy/Ivy 0x710
                // 15: Haswell/Broadwell 0xad9
                // 16: Skylake/KabyLake 0x56c (and some Haswell, example 0xa2e0008)
                // 17: custom LMAX=0x7a1
                // 18: custom LMAX=0x1499
                // 19: CoffeeLake 0xffff
                // 99: Other (requires custom profile using WhateverGreen.kext via DeviceProperties applbkl-name and applbkl-data)
                Name(_UID, 0)
                Name (_STA, 0x0B)
        
                Field(^RMP3, AnyAcc, NoLock, Preserve)
                {
                    Offset(0x02), GDID,16,
                    Offset(0x10), BAR1,32,
                }

                // IGPU PWM backlight register descriptions:
                //   LEV2 not currently used
                //   LEVL level of backlight in Sandy/Ivy
                //   P0BL counter, when zero is vertical blank
                //   GRAN see description below in INI1 method
                //   LEVW should be initialized to 0xC0000000
                //   LEVX PWMMax except FBTYPE_HSWPLUS combo of max/level (Sandy/Ivy stored in MSW)
                //   LEVD level of backlight for Coffeelake
                //   PCHL not currently used
                OperationRegion(RMB1, SystemMemory, BAR1 & ~0xF, 0xe1184)
                Field(RMB1, AnyAcc, Lock, Preserve)
                {
                    Offset(0x48250),
                    LEV2, 32,
                    LEVL, 32,
                    Offset(0x70040),
                    P0BL, 32,
                    Offset(0xc2000),
                    GRAN, 32,
                    Offset(0xc8250),
                    LEVW, 32,
                    LEVX, 32,
                    LEVD, 32,
                    Offset(0xe1180),
                    PCHL, 32,
                }

                // INI1 is common code used by FBTYPE_HSWPLUS and FBTYPE_CFL
                Method(INI1, 1)
                {
                    // INTEL OPEN SOURCE HD GRAPHICS, INTEL IRIS GRAPHICS, AND INTEL IRIS PRO GRAPHICS PROGRAMMER'S REFERENCE MANUAL (PRM)
                    // FOR THE 2015-2016 INTEL CORE PROCESSORS, CELERON PROCESSORS AND PENTIUM PROCESSORS BASED ON THE "SKYLAKE" PLATFORM
                    // Volume 12: Display (https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-skl-vol12-display.pdf)
                    //   page 189
                    //   Backlight Enabling Sequence
                    //   Description
                    //   1. Set frequency and duty cycle in SBLC_PWM_CTL2 Backlight Modulation Frequency and Backlight Duty Cycle.
                    //   2. Set granularity in 0xC2000 bit 0 (0 = 16, 1 = 128).
                    //   3. Enable PWM output and set polarity in SBLC_PWM_CTL1 PWM PCH Enable and Backlight Polarity.
                    //   4. Change duty cycle as needed in SBLC_PWM_CTL2 Backlight Duty Cycle.
                    // This 0xC value comes from looking what OS X initializes this
                    // register to after display sleep (using ACPIDebug/ACPIPoller)
                    If (0 == (2 & Arg0))
                    {
                        Local5 = 0xC0000000
                        If (CondRefOf(\RMCF.LEVW)) { If (Ones != \RMCF.LEVW) { Local5 = \RMCF.LEVW } }
                        ^LEVW = Local5
                    }
                    // from step 2 above (you may need 1 instead)
                    If (4 & Arg0)
                    {
                        If (CondRefOf(\RMCF.GRAN)) { ^GRAN = \RMCF.GRAN }
                        Else { ^GRAN = 0 }
                    }
                }

                Method(_INI)
                {
                    // IntelBacklight.kext takes care of this at load time...
                    // If RMCF.BKLT does not exist, it is assumed you want to use AppleBacklight.kext...
                    Local4 = 1
                    If (CondRefOf(\RMCF.BKLT)) { Local4 = \RMCF.BKLT }
                    If (!(1 & Local4)) { Return }

                    // Adjustment required when using WhateverGreen.kext
                    Local0 = ^GDID
                    Local2 = Ones
                    If (CondRefOf(\RMCF.LMAX)) { Local2 = \RMCF.LMAX }
                    // Determine framebuffer type (for PWM register layout)
                    Local3 = 0
                    If (CondRefOf(\RMCF.FBTP)) { Local3 = \RMCF.FBTP }

                    // Now fixup the backlight PWM depending on the framebuffer type
                    // At this point:
                    //   Local4 is RMCF.BLKT value, if specified (default is 1)
                    //   Local0 is device-id for IGPU
                    //   Local2 is LMAX, if specified (Ones means based on device-id)
                    //   Local3 is framebuffer type

                    // check Sandy/Ivy
                    If (FBTYPE_SANDYIVY == Local3 || Ones != Match(Package()
                    {
                        // Sandy HD3000
                        0x010b, 0x0102,
                        0x0106, 0x1106, 0x1601, 0x0116, 0x0126,
                        0x0112, 0x0122,
                        // Ivy
                        0x0152, 0x0156, 0x0162, 0x0166,
                        0x016a,
                        // Arrandale
                        0x0046, 0x0042,
                    }, MEQ, Local0, MTR, 0, 0))
                    {
                        if (Ones == Local2) { Local2 = SANDYIVY_PWMMAX }
                        // change/scale only if different than current...
                        Local1 = ^LEVX >> 16
                        If (!Local1) { Local1 = Local2 }
                        If (!(8 & Local4) && Local2 != Local1)
                        {
                            // set new backlight PWMMax but retain current backlight level by scaling
                            Local0 = (^LEVL * Local2) / Local1
                            //REVIEW: wait for vblank before setting new PWM config
                            //For (Local7 = ^P0BL, ^P0BL == Local7, ) { }
                            Local3 = Local2 << 16
                            If (Local2 > Local1)
                            {
                                // PWMMax is getting larger... store new PWMMax first
                                ^LEVX = Local3
                                ^LEVL = Local0
                            }
                            Else
                            {
                                // otherwise, store new brightness level, followed by new PWMMax
                                ^LEVL = Local0
                                ^LEVX = Local3
                            }
                        }
                    }
                    // check CoffeeLake and later
                    ElseIf (FBTYPE_CFL == Local3 || Ones != Match(Package()
                    {
                        // CoffeeLake and Whiskey Lake and CometLake and IceLake
                        0x3e9b, 0x3ea5, 0x3e92, 0x3e91, 0x3EA0, 0x3EA6, 0x3E98, 
                        0x9BC8, 0x9BC5, 0x9BC4, 0xFF05, 0x8A70, 0x8A71, 0x8A51, 
                        0x8A5C, 0x8A5D, 0x8A52, 0x8A53, 0x8A56, 0x8A5A, 0x8A5B, 
                        0x9B41, 0x9B21, 0x9BCA, 0x9BA4,
                    }, MEQ, Local0, MTR, 0, 0))
                    {
                        if (Ones == Local2) { Local2 = COFFEELAKE_PWMMAX }
                    }
                    // otherwise must be Haswell/Broadwell/Skylake/KabyLake/KabyLake-R (FBTYPE_HSWPLUS)
                    Else
                    {
                        if (Ones == Local2)
                        {
                            // check Haswell and Broadwell, as they are both 0xad9 (for most common ig-platform-id values)
                            If (Ones != Match(Package()
                            {
                                // Haswell
                                0x0d26, 0x0a26, 0x0d22, 0x0412, 0x0416, 0x0a16, 0x0a1e, 0x0a1e, 0x0a2e, 0x041e, 0x041a,
                                // Broadwell
                                0x0bd1, 0x0bd2, 0x0BD3, 0x1606, 0x160e, 0x1616, 0x161e, 0x1626, 0x1622, 0x1612, 0x162b,
                            }, MEQ, Local0, MTR, 0, 0))
                            {
                                Local2 = HASWELL_PWMMAX
                            }
                            Else
                            {
                                // assume Skylake/KabyLake/KabyLake-R, both 0x56c
                                // 0x1916, 0x191E, 0x1926, 0x1927, 0x1912, 0x1932, 0x1902, 0x1917, 0x191b,
                                // 0x5916, 0x5912, 0x591b, others...
                                Local2 = SKYLAKE_PWMMAX
                            }
                        }
                        INI1(Local4)
                        // change/scale only if different than current...
                        Local1 = ^LEVX >> 16
                        If (!Local1) { Local1 = Local2 }
                        If (!(8 & Local4) && Local2 != Local1)
                        {
                            // set new backlight PWMAX but retain current backlight level by scaling
                            Local0 = (((^LEVX & 0xFFFF) * Local2) / Local1) | (Local2 << 16)
                            //REVIEW: wait for vblank before setting new PWM config
                            //For (Local7 = ^P0BL, ^P0BL == Local7, ) { }
                            ^LEVX = Local0
                        }
                    }

                    // Now Local2 is the new PWMMax, set _UID accordingly
                    // The _UID selects the correct entry in WhateverGreen.kext
                    If (Local2 == SANDYIVY_PWMMAX) { _UID = 14 }
                    ElseIf (Local2 == HASWELL_PWMMAX) { _UID = 15 }
                    ElseIf (Local2 == SKYLAKE_PWMMAX) { _UID = 16 }
                    ElseIf (Local2 == CUSTOM_PWMMAX_07a1) { _UID = 17 }
                    ElseIf (Local2 == CUSTOM_PWMMAX_1499) { _UID = 18 }
                    ElseIf (Local2 == COFFEELAKE_PWMMAX) { _UID = 19 }
                    Else { _UID = 99 } 
                }
            }
        }
    }
}
