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

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Message-ID: <20240507082906.GU1227636@google.com>
Date: Tue, 7 May 2024 09:29:06 +0100
From: Lee Jones <lee@...nel.org>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: 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>,
	Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH] platform/chrome: cros_kbd_led_backlight: enable probing
 through EC_FEATURE_PWM_KEYB

On Sun, 05 May 2024, 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.
> 
> Extend the cros_ec MFD device to also load cros_kbd_led_backlight
> when the EC reports EC_FEATURE_PWM_KEYB.
> 
> Tested on a Framework 13 AMD, Bios 3.05.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> This is based on
> https://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux.git for-next
> 
> The helper keyboard_led_is_mfd_device is a bit iffy, but I couldn't find
> a nicer way.
> 
> * driver_data from platform_device_id is overwritten by the mfd platform data
> * Setting the driver_data in drivers/mfd/cros_ec_dev.c would expose the
>   internals of cros_kbd_led_backlight
> ---
>  drivers/mfd/cros_ec_dev.c                        |  9 ++++++

Split this out please.

>  drivers/platform/chrome/cros_kbd_led_backlight.c | 41 +++++++++++++++++++++++-
>  2 files changed, 49 insertions(+), 1 deletion(-)

-- 
Lee Jones [李琼斯]