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<li class="chapter " data-level="1.1" data-path="../">
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<a href="../">
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Getting Started With ACPI
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SSDTs: Easy Way
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SSDTs: Long Way
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Dumping the DSDT
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Decompiling and Compiling
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Embedded Controllers
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Embedded Controllers
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Backlight PNLF
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Trackpad GPI0
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Plugin type
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AWAC vs RTC
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NVRAM PMC
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IRQ Fix
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GPU Spoof
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Fixing SMBus Support
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Cleanup
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >Trackpad GPI0</a>
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</h1>
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</div>
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<section class="normal markdown-section">
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<h1 id="fixing-trackpads">Fixing Trackpads</h1>
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<p>This SSDT is used to force enable our GPI0 for VoodooI2C to connect onto.</p>
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<p>With most modern laptop DSDTs, there's a variable called <code>GPEN</code> or <code>GPHD</code> which are used for setting the status of the GPI0 device. For us, we want to enable the device.</p>
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<h2 id="finding-our-gpi0">Finding our GPI0</h2>
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<p>So first things we need to do is find out what variable is used to enable our GPI0 device, lets open up our decompiled SSDT and search for <code>Device (GPI0)</code>. Should give you a desult similar to this:</p>
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<p><img src="https://media.discordapp.net/attachments/456913818467958789/677279455525208096/Screen_Shot_2020-02-12_at_3.25.27_PM.png?width=1674&height=1256" alt=""></p>
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<p>What we care about from this is the <code>_STA</code> method:</p>
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<pre><code>Method (_STA, 0, NotSerialized)
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{
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If ((GPHD == One))
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{
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Return (0x03)
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}
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Return (0x0F)
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}
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</code></pre><p>What we want is for this to always return <code>0x0F</code> when booting macOS, so we want to make an SSDT that will return <code>GPHD == Zero</code> in macOS.</p>
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<p><strong>NOTE that you may have the other way around where GPHD needs to be set as <code>One</code> to return <code>0x0F</code></strong>. And your device name may also be different, don't throw random SSDTs in thinking it'll work</p>
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<p>Once you found the variable and what it should be set to, grab a copy of <a href="https://github.com/khronokernel/Getting-Started-With-ACPI/blob/master/extra-files/SSDT-GPI0.dsl" target="_blank">SSDT-GPI0.dsl</a> and make the required edits. Then clean up with compiling it</p>
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<h2 id="more-examples">More examples:</h2>
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<p><img src="https://media.discordapp.net/attachments/456913818467958789/677283983322775572/Screen_Shot_2020-02-12_at_3.34.26_PM.png?width=1674&height=1704" alt=""></p>
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<p>With this example, we can see that we need both <code>SBRG</code> and <code>GPEN</code> to return <code>One</code>. If only one is present, it'll create some issues so in our SSDT we'll want to have both of them return <code>One</code>:</p>
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<pre><code>DefinitionBlock("", "SSDT", 2, "ACDT", "GPI0", 0)
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{
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External(GPEN, FieldUnitObj)
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External(SBRG, FieldUnitObj)
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Scope (\)
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{
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If (_OSI ("Darwin"))
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{
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GPEN = One
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SBRG = One
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}
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}
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}
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</code></pre>
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