Add polling configuration

[localcc]

• Added forced polling support
• Added polling interval configuration
• Polling configuration docs

For some trackpads (like ELAN0626) interrupt mode initializes fine, but the trackpad is unusable due to extreme lag. That's why we may need to force polling in some cases.

[ben9923]

I believe forced polling is already supported.
Either add the -vi2c-force-polling boot arg, or add the force-polling property to the relevant I2C controller.
See the installation page in the VoodooI2C docs.

Do note that in many cases it's a user error that breaks GPIO interrupts, rather than a buggy OEM implementation.

[localcc]

Oh, didn't know you could enable forced polling in vi2cl. But I don't think you can configure polling interval, and I had some problems with the default one. In that case, should I just change the request to only include interval configuration?

[Williamtung1]

For my Elan0626, even adding -vi2c-force-polling to force polling doesn't work.(no input at all) I agree to OP and can you merge the request please.
[Edit]: By the way OP, can you provide a compiled version of your VoodooI2CELAN kext to me please. My machine and I are too weak to compile it. Appreciate for your hard-work