Re: [PATCH v2] serio: PS2 gpio bit banging driver for the serio bus

[danilokrummrich]

On 2017-08-01 01:34, Randy Dunlap wrote:
> On 07/31/2017 03:35 PM, Danilo Krummrich wrote:
>
> > diff --git a/Documentation/gpio/drivers-on-gpio.txt 
> > b/Documentation/gpio/drivers-on-gpio.txt
> > index 3065132..b106e72 100644
> > --- a/Documentation/gpio/drivers-on-gpio.txt
> > +++ b/Documentation/gpio/drivers-on-gpio.txt
> > @@ -84,6 +84,11 @@ hardware descriptions such as device tree or ACPI:
> >    NAND flash MTD subsystem and provides chip access and partition 
> > parsing like
> >    any other NAND driving hardware.
> >
> > +- ps2-gpio: drivers/input/serio/ps2-gpio.c is used to drive an PS2 
> > serio bus,
>
>                                                          drive a PS2
> Is this PS2 as in IBM Micro Channel or PlayStation 2?
It's the PS/2 mouse/keyboard protocol introduced by IBM.
> > +  data and clock line, by bit banging two GPIO lines. It will appear 
> > as any
> > +  other serio bus to the system and makes it possible to connect 
> > drivers for
> > +  e.g. keyboards and other PS2 protocol based devices.
> > +
> >  Apart from this there are special GPIO drivers in subsystems like 
> > MMC/SD to
> >  read card detect and write protect GPIO lines, and in the TTY serial 
> > subsystem
> >  to emulate MCTRL (modem control) signals CTS/RTS by using two GPIO 
> > lines. The
> > diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
> > index c3d05b4..abca0e0 100644
> > --- a/drivers/input/serio/Kconfig
> > +++ b/drivers/input/serio/Kconfig
> > @@ -292,6 +292,16 @@ config SERIO_SUN4I_PS2
> >  	  To compile this driver as a module, choose M here: the
> >  	  module will be called sun4i-ps2.
> >
> > +config SERIO_GPIO_PS2
> > +	tristate "GPIO PS/2 bit banging driver"
>
> 	depends on GPIO
> ??
Thank you, missed that.
> > +	help
> > +	  Say Y here if you want PS/2 bit banging support via GPIO.
> > +
> > +	  To compile this driver as a module, choose M here: the
> > +	  module will be called gpio-ps2.
> > +
> > +	  If you are unsure, say N.
> > +
> >  config USERIO
> >  	tristate "User space serio port driver support"
> >  	help