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From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Siarhei Vishniakou <svv@google.com>
Cc: Jiri Kosina <jikos@kernel.org>,
	 Benjamin Tissoires <bentiss@kernel.org>,
	Ping Cheng <ping.cheng@wacom.com>,
	 Jason Gerecke <jason.gerecke@wacom.com>,
	Jonathan Corbet <corbet@lwn.net>,
	 Henrik Rydberg <rydberg@bitmath.org>,
	linux-input@vger.kernel.org, linux-doc@vger.kernel.org,
	 linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] Input: add ABS_TWIST and support it in HID and Wacom
Date: Mon, 9 Nov 2026 18:25:38 -0800	[thread overview]
Message-ID: <avKAaJxlxE8gOYVV@google.com> (raw)
In-Reply-To: <20261110020632.4003499-1-svv@google.com>

Hi Siarhei,

On Mon, Nov 09, 2026 at 06:06:29PM -0800, Siarhei Vishniakou wrote:
> Some styli can report rotation along their long ("barrel") axis,
> commonly referred to as "twist". While the HID specification defines
> this usage as HID_DG_TWIST (0x000d0041) in the Digitizers page, there is
> currently no corresponding evdev axis code to expose it to userspace.
> 
> Because evdev has no MSC_SCAN equivalent for axes, drivers and OEMs
> currently work around this by mapping stylus twist onto unrelated axes
> such as ABS_Z or ABS_RZ. As a result, userspace input stacks must
> maintain device-specific workarounds to know which axis carries twist.

How is it different from orientation?

Thanks.

-- 
Dmitry

  parent reply	other threads:[~2026-11-10  2:25 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-10  2:06 [PATCH 0/3] Input: add ABS_TWIST and support it in HID and Wacom Siarhei Vishniakou
2026-11-10  2:06 ` [PATCH 1/3] Input: add ABS_TWIST event code Siarhei Vishniakou
2026-11-10  2:06 ` [PATCH 2/3] HID: input: map Digitizers Twist usage to ABS_TWIST Siarhei Vishniakou
2026-11-10  2:06 ` [PATCH 3/3] HID: wacom: report ABS_TWIST alongside ABS_Z for pen twist Siarhei Vishniakou
2026-11-10  2:25 ` Dmitry Torokhov [this message]
2026-11-10 18:57   ` [PATCH 0/3] Input: add ABS_TWIST and support it in HID and Wacom Siarhei Vishniakou

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