linux-kernel - Re: [PATCH] platform/chrome: cros_kbd_led_backlight: enable probing through EC_FEATURE_PWM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Mon, 6 May 2024 19:38:09 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Mario Limonciello <mario.limonciello@....com>
Cc: Lee Jones <lee@...nel.org>, Benson Leung <bleung@...omium.org>, 
	Guenter Roeck <groeck@...omium.org>, Tzung-Bi Shih <tzungbi@...nel.org>, 
	chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org, Dustin Howett <dustin@...ett.net>
Subject: Re: [PATCH] platform/chrome: cros_kbd_led_backlight: enable probing
 through EC_FEATURE_PWM_KEYB

On 2024-05-05 08:42:21+0000, Mario Limonciello wrote:
> On 5/5/2024 04:41, Thomas Weißschuh wrote:
> > The ChromeOS EC used in Framework laptops supports the standard cros
> > keyboard backlight protocol.
> > However the firmware on these laptops don't implement the ACPI ID
> > GOOG0002 that is recognized by cros_kbd_led_backlight and they also
> > don't use device tree.
> 
> Something I'd wonder is if the GOOG0002 ACPI ID can go away entirely with
> this type of change.  Presumably the Chromebooks with ChromeOS EC /also/
> advertise EC_FEATURE_PWM_KEYB.

Sounds good to me in general. It would make the code cleaner.

But I have no idea how CrOS kernels are set up in general.
If they are not using CONFIG_MFD_CROS_EC_DEV for some reason that
wouldn't work.

If the CrOS folks agree with that aproach I'll be happy to implement it.

> <snip>

Thomas