linux-kernel - Re: [PATCH v4 2/2] drm/tiny: add driver for Apple Touch Bars in x86 Macs

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Message-ID:
 <PN3PR01MB95977080AD62E0BD2518C106B8C32@PN3PR01MB9597.INDPRD01.PROD.OUTLOOK.COM>
Date: Tue, 25 Feb 2025 08:02:37 +0000
From: Aditya Garg <gargaditya08@...e.com>
To: Thomas Zimmermann <tzimmermann@...e.de>
CC: "maarten.lankhorst@...ux.intel.com" <maarten.lankhorst@...ux.intel.com>,
	"mripard@...nel.org" <mripard@...nel.org>, "airlied@...il.com"
	<airlied@...il.com>, "simona@...ll.ch" <simona@...ll.ch>,
	"andriy.shevchenko@...ux.intel.com" <andriy.shevchenko@...ux.intel.com>,
	Kerem Karabay <kekrby@...il.com>, Atharva Tiwari <evepolonium@...il.com>,
	Aun-Ali Zaidi <admin@...eit.net>, Linux Kernel Mailing List
	<linux-kernel@...r.kernel.org>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v4 2/2] drm/tiny: add driver for Apple Touch Bars in x86
 Macs



> On 25 Feb 2025, at 1:27 PM, Thomas Zimmermann <tzimmermann@...e.de> wrote:
> 
> Hi
> 
> Am 24.02.25 um 17:58 schrieb Aditya Garg:
> [...]
>>> 
>>> +config DRM_APPLETBDRM
>>> +    tristate "DRM support for Apple Touch Bars"
>>> +    depends on DRM && USB && MMU
>>> +    select DRM_GEM_SHMEM_HELPER
>>> +    select DRM_KMS_HELPER
>>> +    select HID_APPLETB_BL
>> Btw I have a doubt regarding this dependency. While hid-appletb-bl has made into the linux-next tree, it has still not been merged into Linus' tree, and neither the drm tree I assume. It potentially could cause issues?
> 
> Yes. We cannot merge this driver until we have this symbol in our tree. But that will happen sooner or later.
> 
> More problematic is that your driver selects HID_APPLETB_BL. From what I've seen, this symbol is user configurable, so the driver shouldn't select it. You need to use 'depends on' instead of 'select' here.

I assume we need the same for HID_MULTITOUCH as well, since it's needed for the touch feedback.
> 
> Best regards
> Thomas
> 
>> 
>>> +    select HID_MULTITOUCH
>>> +    help
>>> +      Say Y here if you want support for the display of Touch Bars on x86
>>> +      MacBook Pros.
>>> +
>>> +      To compile this driver as a module, choose M here: the
>>> +      module will be called appletbdrm.
>>> +
> 
> --
> --
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Frankenstrasse 146, 90461 Nuernberg, Germany
> GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
> HRB 36809 (AG Nuernberg)
>