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From: Peter Hutterer <peter.hutterer@who-t.net>
To: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: "Jiri Kosina" <jikos@kernel.org>,
	"Dmitry Torokhov" <dmitry.torokhov@gmail.com>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Ahelenia Ziemiańska" <nabijaczleweli@nabijaczleweli.xyz>,
	"Ping Cheng" <pinglinux@gmail.com>,
	"Aaron Armstrong Skomra" <skomra@gmail.com>,
	"Jason Gerecke" <killertofu@gmail.com>,
	linux-input@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 12/12] Input: docs: add more details on the use of BTN_TOOL
Date: Wed, 16 Feb 2022 15:40:18 +1000	[thread overview]
Message-ID: <YgyOQuN9+IEsCsoA@quokka> (raw)
In-Reply-To: <20220203143226.4023622-13-benjamin.tissoires@redhat.com>

On Thu, Feb 03, 2022 at 03:32:26PM +0100, Benjamin Tissoires wrote:
> The HID core stack used to be very relaxed considering the BTN_TOOL_*
> usage. With the recent commits, we should now enforce to have only one
> tool at a time, meaning that we can now express that requirement in the
> docs.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> 
> ---
> 
> changes in v2:
> - changed to explain that switching tool in one EV_SYN report
>   is not nice for userspace
> ---
>  Documentation/input/event-codes.rst | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/input/event-codes.rst b/Documentation/input/event-codes.rst
> index b24ae7d292cc..8741d390b184 100644
> --- a/Documentation/input/event-codes.rst
> +++ b/Documentation/input/event-codes.rst
> @@ -137,7 +137,11 @@ A few EV_KEY codes have special meanings:
>      code should be set to a value of 1. When the tool is no longer interacting
>      with the input device, the BTN_TOOL_<name> code should be reset to 0. All
>      trackpads, tablets, and touchscreens should use at least one BTN_TOOL_<name>
> -    code when events are generated.
> +    code when events are generated. Likewise all trackpads, tablets, and
> +    touchscreens should export only one BTN_TOOL_<name> at a time. To not break

I still think s/export/set to nonzero/ to avoid any ambiguity with setting the
evbit on the device vs setting the value to nonzero here, but the remainder is
good, thanks :)

Acked-by: Peter Hutterer <peter.hutterer@who-t.net>

Cheers,
  Peter


> +    existing userspace, it is recommended to not switch tool in one EV_SYN frame
> +    but first emitting the old BTN_TOOL_<name> at 0, then emit one SYN_REPORT
> +    and then set the new BTN_TOOL_<name> at 1.
>  
>  * BTN_TOUCH:
>  
> -- 
> 2.33.1
> 

  reply	other threads:[~2022-02-16  5:40 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-03 14:32 [PATCH v2 00/12] HID: fix for generic input processing Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 01/12] HID: core: statically allocate read buffers Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 02/12] HID: core: de-duplicate some code in hid_input_field() Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 03/12] HID: core: split data fetching from processing " Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 04/12] HID: input: tag touchscreens as such if the physical is not there Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 05/12] HID: input: rework spaghetti code with switch statements Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 06/12] HID: input: move up out-of-range processing of input values Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 07/12] HID: compute an ordered list of input fields to process Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 08/12] HID: core: for input reports, process the usages by priority list Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 09/12] HID: input: enforce Invert usage to be processed before InRange Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 10/12] HID: input: remove the need for HID_QUIRK_INVERT Benjamin Tissoires
2022-02-04  1:41   ` Ping Cheng
2022-02-10  5:21   ` Ping Cheng
2022-02-10  5:43     ` Ping Cheng
2022-02-14 10:23       ` Benjamin Tissoires
2022-02-15  2:04         ` Ping Cheng
2022-02-15  8:51           ` Benjamin Tissoires
2022-02-16 12:42             ` Benjamin Tissoires
2022-02-17  1:27               ` Ping Cheng
2022-02-03 14:32 ` [PATCH v2 11/12] HID: input: accommodate priorities for slotted devices Benjamin Tissoires
2022-02-03 14:32 ` [PATCH v2 12/12] Input: docs: add more details on the use of BTN_TOOL Benjamin Tissoires
2022-02-16  5:40   ` Peter Hutterer [this message]
2022-03-01 14:53 ` [PATCH v2 00/12] HID: fix for generic input processing Jiri Kosina

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