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

On 2017-08-01 01:34, Randy Dunlap wrote:

On 07/31/2017 03:35 PM, Danilo Krummrich wrote:

quoted

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.

quoted

+  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.

quoted

+	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