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How to remap Fn+up/down to PageUp/PageDown ?

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Hi!

I've found that key combination extremely useful for coding - it is default keyboard functions for Asus UX305CA that I've also hacked.
I belive there's many options, but I'd prefer DSDT hotpatch approach if available :D (I'm using hotpatch approach to DSDT)
Got hack Probook 450G2, 10.11.6, not using VoodooPS2, have some proficiency in patching DSDT, using ACPIDebug...
Where to start?
Should I install VoodooPS2 and provide custom ADB keymap remap table for this, finding specific codes with Debug version? Or rather instrument EC queries ?

Thanks for help!
 

RehabMan

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Hi!

I've found that key combination extremely useful for coding - it is default keyboard functions for Asus UX305CA that I've also hacked.
I belive there's many options, but I'd prefer DSDT hotpatch approach if available :D (I'm using hotpatch approach to DSDT)
Got hack Probook 450G2, 10.11.6, not using VoodooPS2, have some proficiency in patching DSDT, using ACPIDebug...
Where to start?
Should I install VoodooPS2 and provide custom ADB keymap remap table for this, finding specific codes with Debug version? Or rather instrument EC queries ?

Thanks for help!

Most PC keyboards do not generate a separate code for Fn (there are rare exceptions such as my Lenovo u430).
The Fn key usually modifies existing keys instead of generating a standalone code.
Are you finding your Fn key generates its own separate scan code when pressed by itself?

Note: The two ProBooks here (4530s, 4540s) do not generate a standalone PS2 scan code for Fn.
 
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Is there a way to check it on vanilla S/L/E ? But I doubt Fn key generates scancode - I didn't observe such behavior on apps...
Can I use Karabiner to do such remap? I've installed it but didn't find specific complex rule...
 

RehabMan

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Is there a way to check it on vanilla S/L/E ? But I doubt Fn key generates scancode - I didn't observe such behavior on apps...
Can I use Karabiner to do such remap? I've installed it but didn't find specific complex rule...

It is very unlikely your Probook generates a PS2 code for Fn by itself.

Detecting whether it does or not requires building a custom VoodooPS2Controller.kext.

In VoodooPS2Keyboard.cpp, you find this commented code:
Code:
PS2InterruptResult ApplePS2Keyboard::interruptOccurred(UInt8 data)   // PS2InterruptAction
{
    ////IOLog("ps2interrupt: scanCode = %02x\n", data);
    ////uint64_t time;
    ////clock_get_uptime(&time);
    ////IOLog("ps2interrupt(%lld): scanCode = %02x\n", time, data);
...
}

If you uncomment those lines, you will get output in the kernel logs of each PS2 scan code that comes from the keyboard port (this code is the keyboard interrupt handler).
 
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Thanks Rehabman! Built modified kext. I will check rest tommorow!
 
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Ok, so here's the gathered intel.
Fn indeed doesn't generate scancode - modified VoodooPS2Controller.kext (I had to go back to XCode5.1.1 to compile it (macosx10.8 SDK) ;) didn't reveal any surprises.
What I know from there are scancodes for :

keydown : e050=7d
keyup : e048=7e
pageup : e049=74
pagedn : e051=79

I patched DSDT for ACPIDebug (injected RMDT device and instrumented EC queries), although ACPIDebug (not installed in /L/E nor /S/L/E - loaded via sudo kextload with proper permissions/owners [0:0]) doesn't show any debug info in system.log besides "ACPIDebug: Version 0.1.4 starting on OS X Darwin 15.6."
I got only one message (ACPIDebug: "EC _Q22 enter") ever since...

Attached some files, I know I have some mess in ioReg, but anyhow it works somehow... ;)

Code:
gobomac:Release gobo$ kextstat | grep ACPI
   11   28 0xffffff7f80b83000 0x9000     0x9000     com.apple.iokit.IOACPIFamily (1.4) 5D7574C3-8E90-3873-BAEB-D979FC215A7D <7 6 4 3>
   13    2 0xffffff7f82e63000 0x66000    0x66000    com.apple.driver.AppleACPIPlatform (4.0) A29C7512-D3A8-3AED-9721-3A5FF1A32EB2 <12 11 7 6 5 4 3 1>
   32    0 0xffffff7f82ec9000 0x7000     0x7000     com.apple.driver.AppleACPIEC (4.0) 87E6B264-9FE7-354F-A83B-2AF966681A50 <31 13 11 5 4 3>
   34    0 0xffffff7f82ed3000 0x4000     0x4000     com.apple.driver.AppleACPIButtons (4.0) 456C28F7-4F2B-3F00-97C9-BF6023DADD7C <33 15 13 11 7 6 5 4 3 1>
   38    0 0xffffff7f81338000 0x2000     0x2000     com.rehabman.driver.ACPIPoller (0.8.1) 4150AC89-DEC4-37F1-9CA3-04184F3B5AA1 <11 4 3>
  147    0 0xffffff7f82f6c000 0x4000     0x4000     com.rehabman.driver.ACPIDebug (0.1.4) 9A0916D1-E9C6-3570-90E9-4DDC4BB19FB7 <11 4 3>

EDIT: I've also checked by patchmatic for existence of RMDT signature in DSDT.aml.

EDIT2: After mind-parsing those EC queries in my DSDT I really doubt that Fn keys goes through it somewhere, also... (I'm probably saying that wheel is circular here, but have no exp with this...)
 

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RehabMan

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I had to go back to XCode5.1.1 to compile it (macosx10.8 SDK) ;)

I'm using Xcode9 with the various SDKs added to it.

Fn indeed doesn't generate scancode

Then it is not possible to do what you want to do.

What I know from there are scancodes for :

keydown : e050=7d
keyup : e048=7e
pageup : e049=74
pagedn : e051=79

These are standard arrow/page keys.
 
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Yup, unfortunately. Lets close this topic as unsolvable...
 
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