linux-kernel - Re: [PATCH v3 0/5] HID: multitouch: Add support for Touch Bars on x86 MacBook Pros

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Message-ID: <8r1757q9-7qqq-n6p8-0no1-040rssnsn260@xreary.bet>
Date: Wed, 11 Jun 2025 11:26:32 +0200 (CEST)
From: Jiri Kosina <jikos@...nel.org>
To: Aditya Garg <gargaditya08@...e.com>
cc: Benjamin Tissoires <bentiss@...nel.org>, Kerem Karabay <kekrby@...il.com>, 
    Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, 
    Linux Input Mailing List <linux-input@...r.kernel.org>
Subject: Re: [PATCH v3 0/5] HID: multitouch: Add support for Touch Bars on
 x86 MacBook Pros

On Tue, 27 May 2025, Aditya Garg wrote:

> This patch series aims to improve the Touch Bar support for x86 Macs.
> 
> The `hid-appletb-kbd` and `hid-appletb-bl` drivers were upstreamed into
> the Linux kernel and are available since version 6.15. They enable the
> Touch Bar to display a predefined set of media and function keys, exactly
> the same it does on Windows Bootcamp.
> 
> Alongwith that, support for the DRM mode of the driver has also been
> upstreamed in kernel 6.15.
> 
> The DRM mode enables the Touch Bar to act as a second display, just like
> macOS. So now you can add a widget, put a clock or anything else on the
> Touch Bar as long as you can develop a daemon.
> 
> For this mode, we needed two patchsets. One went to the DRM tree as the
> `appletbdrm` driver, and other is this.
> 
> The DRM driver is responsible for displaying whatever the OS wants on
> the Touch Bar.
> 
> Now via these patches, in the DRM mode, we can use the Touch Bar as a
> touch screen. The Touch Bar seems to be not compliant with the HID spec,
> thus via these patches several tweaks have been done under the cover of
> a single quirk, MT_QUIRK_APPLE_TOUCHBAR. Originally expected to be
> upstreamed alongwith the DRM driver on 6.15, these patches seem to have
> remained in a backlog.
> 
> For the case of T2 Macs, apple-bce [1], the driver for the T2 Security
> Chip is also needed for all the peripherals, including the Touch Bar
> to work. It is still WIP, and will be subsequently sent later to the
> appropriate tree. Till then, I'll suggest testers to get the driver
> from [1], or more preferably, get Linux support from https://t2linux.org/.
> 
> Cheers
> Aditya
> 
> [1]: https://github.com/t2linux/apple-bce-drv
> 
> Changelog:
> 
> v2: keep parse at original location in patch 5 as suggested by Benjamin
> v3: Reword the cover letter to update the maintainers with the latest
>     situation, and re-prepare the patches on 6.15.
> 
> Kerem Karabay (5):
>   HID: multitouch: Get the contact ID from HID_DG_TRANSDUCER_INDEX
>     fields in case of Apple Touch Bar
>   HID: multitouch: support getting the tip state from HID_DG_TOUCH
>     fields in Apple Touch Bar
>   HID: multitouch: take cls->maxcontacts into account for Apple Touch
>     Bar even without a HID_DG_CONTACTMAX field
>   HID: multitouch: specify that Apple Touch Bar is direct
>   HID: multitouch: add device ID for Apple Touch Bar

Now queued in hid.git#for-6.17/multitouch, thanks.

-- 
Jiri Kosina
SUSE Labs