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

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Date:   Tue, 01 Aug 2017 06:11:56 +0200
From:   danilokrummrich@...develop.de
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        dmitry.torokhov@...il.com, linus.walleij@...aro.org
Subject: 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:
> 
>> 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