linux-kernel - Re: [PATCH v2 1/5] Add the `REL_WHEEL_HI

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Date:   Mon, 3 Sep 2018 15:43:13 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Harry Cutts <hcutts@...omium.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
cc:     linux-input <linux-input@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jiri Kosina <jiri.kosina@...e.cz>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-doc@...r.kernel.org, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v2 1/5] Add the `REL_WHEEL_HI_RES` event code

On Thu, 30 Aug 2018, Harry Cutts wrote:

> This event code represents scroll reports from high-resolution wheels,
> and will be used by future patches in this series. See the linux-input
> "Reporting high-resolution scroll events" thread [0] for more details.
> 
> [0]: https://www.spinics.net/lists/linux-input/msg57380.html
> 
> Signed-off-by: Harry Cutts <hcutts@...omium.org>
> ---
> 
> Changes in v2: None
> 
>  Documentation/input/event-codes.rst    | 11 ++++++++++-
>  include/uapi/linux/input-event-codes.h |  1 +
>  2 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/input/event-codes.rst b/Documentation/input/event-codes.rst
> index a8c0873beb95..cef220c176a4 100644
> --- a/Documentation/input/event-codes.rst
> +++ b/Documentation/input/event-codes.rst
> @@ -190,7 +190,16 @@ A few EV_REL codes have special meanings:
>  * REL_WHEEL, REL_HWHEEL:
>  
>    - These codes are used for vertical and horizontal scroll wheels,
> -    respectively.
> +    respectively. The value is the number of "notches" moved on the wheel, the
> +    physical size of which varies by device. For high-resolution wheels (which
> +    report multiple events for each notch of movement, or do not have notches)
> +    this may be an approximation based on the high-resolution scroll events.
> +
> +* REL_WHEEL_HI_RES:
> +
> +  - If a vertical scroll wheel supports high-resolution scrolling, this code
> +    will be emitted in addition to REL_WHEEL. The value is the (approximate)
> +    distance travelled by the user's finger, in microns.
>  
>  EV_ABS
>  ------
> diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
> index 53fbae27b280..dad8d3890a3a 100644
> --- a/include/uapi/linux/input-event-codes.h
> +++ b/include/uapi/linux/input-event-codes.h
> @@ -708,6 +708,7 @@
>  #define REL_DIAL		0x07
>  #define REL_WHEEL		0x08
>  #define REL_MISC		0x09
> +#define REL_WHEEL_HI_RES	0x0a
>  #define REL_MAX			0x0f
>  #define REL_CNT			(REL_MAX+1)

Dmitry, is this OK with you?

Thanks,

-- 
Jiri Kosina
SUSE Labs