linux-kernel - Re: [PATCH 3/4] HID: Introduce a module parameter to disable automatic switch of Logitech gaming wheels from compatibility to native mode. This only applies to multimode wheels.

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Date:	Tue, 17 Feb 2015 13:10:43 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Michal Malý <madcatxster@...oid-pointer.net>
cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	simon@...gewell.org, elias.vds@...il.com
Subject: Re: [PATCH 3/4] HID: Introduce a module parameter to disable automatic
 switch of Logitech gaming wheels from compatibility to native mode. This
 only applies to multimode wheels.

On Fri, 6 Feb 2015, Michal Malý wrote:

> Introduce a module parameter to disable automatic switch of Logitech gaming
> wheels from compatibility to native mode. This only applies to multimode wheels.
> 
> Signed-off-by: Michal Malý <madcatxster@...oid-pointer.net> 
> ---
>  drivers/hid/hid-lg.c    | 6 ++++++
>  drivers/hid/hid-lg4ff.c | 4 +++-
>  2 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hid/hid-lg.c b/drivers/hid/hid-lg.c
> index f91ff14..8dae03f 100644
> --- a/drivers/hid/hid-lg.c
> +++ b/drivers/hid/hid-lg.c
> @@ -818,4 +818,10 @@ static struct hid_driver lg_driver = {
>  };
>  module_hid_driver(lg_driver);
>  
> +#ifdef CONFIG_LOGIWHEELS_FF
> +extern int lg4ff_no_autoswitch; /* From hid-lg4ff.c */
> +module_param_named(lg4ff_no_autoswitch, lg4ff_no_autoswitch, int, S_IRUGO);
> +MODULE_PARM_DESC(lg4ff_no_autoswitch, "Do not switch multimode wheels to their native mode automatically");
> +#endif
> +
>  MODULE_LICENSE("GPL");
> diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
> index b9c9fe6..cbb000a 100644
> --- a/drivers/hid/hid-lg4ff.c
> +++ b/drivers/hid/hid-lg4ff.c
> @@ -67,6 +67,7 @@
>  #define LG4FF_FFEX_REV_MAJ 0x21
>  #define LG4FF_FFEX_REV_MIN 0x00
>  
> +int lg4ff_no_autoswitch = 0;

This sharing of variable without header file is ugly. Could you please 
declare it properly as extern in logitech header?

-- 
Jiri Kosina
SUSE Labs
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