linux-kernel - Re: [PATCH 3/3] platform/x86: asus-armoury: add keyboard control firmware attributes

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Message-ID: <3b2d6500-0f54-42bc-bc9d-3bbe0fbef5c8@kernel.org>
Date: Fri, 26 Dec 2025 12:06:39 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Denis Benato <denis.benato@...ux.dev>, linux-kernel@...r.kernel.org
Cc: platform-driver-x86@...r.kernel.org, Hans de Goede <hansg@...nel.org>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 "Luke D . Jones" <luke@...nes.dev>, Mateusz Schyboll <dragonn@...pl>,
 Denis Benato <benato.denis96@...il.com>
Subject: Re: [PATCH 3/3] platform/x86: asus-armoury: add keyboard control
 firmware attributes

On 25/12/2025 15:30, Denis Benato wrote:
> +ASUS_ATTR_GROUP_BOOL(kbd_leds_shutdown, "kbd_leds_shutdown",
> +		     "Keyboard backlight while system is shutdown");
> +
>  static ssize_t gpu_mux_mode_current_value_store(struct kobject *kobj,
>  						struct kobj_attribute *attr,
>  						const char *buf, size_t count)
> @@ -867,6 +1043,35 @@ static bool has_valid_limit(const char *name, const struct power_limits *limits)
>  	return limit_value > 0;
>  }
>  
> +static struct asus_armoury_kbd_status *asus_init_kbd_state(void)
> +{
> +	int err;
> +	u32 kbd_status;
> +	struct asus_armoury_kbd_status *kbd_state __free(kfree) = NULL;

This is an undesired syntax explicitly documented as one to avoid. You
need here proper assignment, not NULL. Please don't use cleanup.h if you
do not intend to follow it because it does not make the code simpler.

> +
> +	err = armoury_get_devstate(NULL, &kbd_status, ASUS_WMI_DEVID_TUF_RGB_STATE);
> +	if (err) {
> +		pr_err("ACPI does not support keyboard power control: %d\n", err);
> +		return ERR_PTR(-ENODEV);
> +	}
> +
> +	pr_info("Detected keyboard backlight support\n");

This does not look like useful printk message. Drivers should be silent
on success:
https://elixir.bootlin.com/linux/v6.15-rc7/source/Documentation/process/coding-style.rst#L913
https://elixir.bootlin.com/linux/v6.15-rc7/source/Documentation/process/debugging/driver_development_debugging_guide.rst#L79

Best regards,
Krzysztof