feature request: pin mode configuration "open-drain"/"push-pull"

[DEvil0000]

it is possible to configure the GPIO pins of the chip to use push-pull instead of open-drain.
open-drain is the default configuration but in my eyes push-pull is more usefull.

I don't know if there is a fancy linux interface for such so i will not deliver a pull request or patch.
For my usecase it was fine to just hardcode all GPIO pins to push-pull but it would be nice if someone can improve this and add it to this driver.

#define SIO_LD_GPIO_MODE        0x0F    /* GPIO mode control device */

superio_select(sio->addr, SIO_LD_GPIO_MODE);
superio_outb(sio->addr, 0xE0, 0x0);
superio_outb(sio->addr, 0xE1, 0x0);