linux-kernel - Re: [PATCH] HID: Add support for Mega World controller force feedback

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Date:   Mon, 11 Apr 2022 16:38:31 -0500
From:   Frank Zago <frank@...o.net>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: Add support for Mega World controller force feedback

On 4/11/22 10:10, Jiri Kosina wrote:
> On Tue, 8 Feb 2022, frank zago wrote:
> 
>> This patch adds support for one of the several Mega World USB game
>> controller with integrated force feedback. It is a HID based
>> memory-less game controller, with a weak motor on the left, and a
>> strong one on the right.
>>
>> Signed-off-by: frank zago <frank@...o.net>
>> ---
>>  drivers/hid/Kconfig         |  14 ++++
>>  drivers/hid/Makefile        |   1 +
>>  drivers/hid/hid-ids.h       |   3 +
>>  drivers/hid/hid-megaworld.c | 136 ++++++++++++++++++++++++++++++++++++
>>  4 files changed, 154 insertions(+)
>>  create mode 100644 drivers/hid/hid-megaworld.c
>>
>> diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
>> index f5544157576c..2344830d3680 100644
>> --- a/drivers/hid/Kconfig
>> +++ b/drivers/hid/Kconfig
>> @@ -684,6 +684,20 @@ config HID_MAYFLASH
>>  	Say Y here if you have HJZ Mayflash PS3 game controller adapters
>>  	and want to enable force feedback support.
>>  
>> +config HID_MEGAWORLD
>> +	tristate "Mega World based game controller support"
>> +	depends on HID
>> +	help
>> +	  Say Y here if you have a Mega World based game controller.
>> +
>> +config MEGAWORLD_FF
>> +	bool "Mega World based game controller force feedback support"
>> +	depends on HID_MEGAWORLD
>> +	select INPUT_FF_MEMLESS
>> +	help
>> +	  Say Y here if you have a Mega World based game controller and want
>> +	  to have force feedback support for it.
>> +
> 
> Hi Frank,
> 
> as the *only* functionality provided by the driver seems to be the force 
> feedback, does it really make sense to decouple the two options?

I don't think so, but that's what at least hid-tmff.c and hid-zpff.c are doing.
I can rework the patch if you prefer to just have the HID_MEGAWORLD option.

Frank.