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SubjectRe: [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:
>
>> 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

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