Re: [PATCH RFC 3/4] input: add a EV_SW event for ratchet switch

[Peter Hutterer <peter.hutterer@who-t.net>]

On Sat, Mar 25, 2017 at 07:49:41PM -0300, Mauro Carvalho Chehab wrote:
> Some mouses have a switch on their wheel, allowing to switch
> between ratchet or free wheel mode. Add support for it.

I understand the want to support it because it's there but what do you
expect this to be used for?

tbh, I wouldn't know what to do with this information, short of displaying
some OSD to inform the user. Which is rather superfluous since the physical
change will feel obvious anyway.

A Documentation/input/event-codes.txt hunk would be welcomed here too
btw.

Cheers,
   Peter

> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
> ---
>  include/linux/mod_devicetable.h        | 2 +-
>  include/uapi/linux/input-event-codes.h | 4 +++-
>  2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> index 8a57f0b1242d..73534c591b40 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -292,7 +292,7 @@ struct pcmcia_device_id {
>  #define INPUT_DEVICE_ID_LED_MAX		0x0f
>  #define INPUT_DEVICE_ID_SND_MAX		0x07
>  #define INPUT_DEVICE_ID_FF_MAX		0x7f
> -#define INPUT_DEVICE_ID_SW_MAX		0x0f
> +#define INPUT_DEVICE_ID_SW_MAX		0x1f
>  
>  #define INPUT_DEVICE_ID_MATCH_BUS	1
>  #define INPUT_DEVICE_ID_MATCH_VENDOR	2
> diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
> index 23b2d377af59..a3eafd0527f1 100644
> --- a/include/uapi/linux/input-event-codes.h
> +++ b/include/uapi/linux/input-event-codes.h
> @@ -782,7 +782,9 @@
>  #define SW_LINEIN_INSERT	0x0d  /* set = inserted */
>  #define SW_MUTE_DEVICE		0x0e  /* set = device disabled */
>  #define SW_PEN_INSERTED		0x0f  /* set = pen inserted */
> -#define SW_MAX			0x0f
> +#define SW_RATCHET		0x10  /* set = ratchet mode,
> +					 unset: free wheel */
> +#define SW_MAX			0x1f
>  #define SW_CNT			(SW_MAX+1)
>  
>  /*
> -- 
> 2.9.3
> 
>