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Message-ID: <bb056dee-508c-6186-324a-d45bbd1c2306@linux.intel.com>
Date: Tue, 6 Aug 2024 13:16:31 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: "Luke D. Jones" <luke@...nes.dev>
cc: platform-driver-x86@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, 
    Hans de Goede <hdegoede@...hat.com>, corentin.chary@...il.com
Subject: Re: [PATCH v2 2/6] platform/x86: asus-armoury: move existing tunings
 to asus-armoury module

On Tue, 6 Aug 2024, Luke D. Jones wrote:

> The fw_attributes_class provides a much cleaner interface to all of the
> attributes introduced to asus-wmi. This patch moves all of these extra
> attributes over to fw_attributes_class, and shifts the bulk of these
> definitions to a new kernel module to reduce the clutter of asus-wmi
> with the intention of deprecating the asus-wmi attributes in future.
> 
> The work applies only to WMI methods which don't have a clearly defined
> place within the sysfs and as a result ended up lumped together in
> /sys/devices/platform/asus-nb-wmi/ with no standard API.
> 
> Where possible the fw attrs now implement defaults, min, max, scalar,
> choices, etc. As en example dgpu_disable becomes:
> 
> /sys/class/firmware-attributes/asus-armoury/attributes/dgpu_disable/
> ├── current_value
> ├── display_name
> ├── possible_values
> └── type
> 
> as do other attributes.
> 
> Signed-off-by: Luke D. Jones <luke@...nes.dev>
> ---
>  drivers/platform/x86/Kconfig               |  14 +
>  drivers/platform/x86/Makefile              |   1 +
>  drivers/platform/x86/asus-armoury.c        | 706 +++++++++++++++++++++
>  drivers/platform/x86/asus-armoury.h        | 195 ++++++
>  drivers/platform/x86/asus-wmi.c            |  48 +-
>  include/linux/platform_data/x86/asus-wmi.h |  11 +
>  6 files changed, 973 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/platform/x86/asus-armoury.c
>  create mode 100644 drivers/platform/x86/asus-armoury.h
> 
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 665fa9524986..8ecc73ef2670 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -265,6 +265,19 @@ config ASUS_WIRELESS
>  	  If you choose to compile this driver as a module the module will be
>  	  called asus-wireless.
>  
> +config ASUS_ARMOURY
> +	tristate "ASUS Armoury (firmware) Driver"
> +	depends on ACPI_WMI
> +	depends on ASUS_WMI
> +	select FW_ATTR_CLASS
> +	help
> +	  Say Y here if you have a WMI aware Asus laptop and would like to use the
> +	  firmware_attributes API to control various settings typically exposed in
> +	  the ASUS Armoury Crate application available on Windows.
> +
> +	  To compile this driver as a module, choose M here: the module will
> +	  be called asus-armoury.
> +
>  config ASUS_WMI
>  	tristate "ASUS WMI Driver"
>  	depends on ACPI_WMI
> @@ -276,6 +289,7 @@ config ASUS_WMI
>  	depends on HOTPLUG_PCI
>  	depends on ACPI_VIDEO || ACPI_VIDEO = n
>  	depends on SERIO_I8042 || SERIO_I8042 = n
> +	select ASUS_ARMOURY
>  	select INPUT_SPARSEKMAP
>  	select LEDS_CLASS
>  	select NEW_LEDS
> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
> index e1b142947067..fe3e7e7dede8 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -32,6 +32,7 @@ obj-$(CONFIG_APPLE_GMUX)	+= apple-gmux.o
>  # ASUS
>  obj-$(CONFIG_ASUS_LAPTOP)	+= asus-laptop.o
>  obj-$(CONFIG_ASUS_WIRELESS)	+= asus-wireless.o
> +obj-$(CONFIG_ASUS_ARMOURY)	+= asus-armoury.o
>  obj-$(CONFIG_ASUS_WMI)		+= asus-wmi.o
>  obj-$(CONFIG_ASUS_NB_WMI)	+= asus-nb-wmi.o
>  obj-$(CONFIG_ASUS_TF103C_DOCK)	+= asus-tf103c-dock.o
> diff --git a/drivers/platform/x86/asus-armoury.c b/drivers/platform/x86/asus-armoury.c
> new file mode 100644
> index 000000000000..bb049ead00f9
> --- /dev/null
> +++ b/drivers/platform/x86/asus-armoury.c
> @@ -0,0 +1,706 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Asus Armoury (WMI) attributes driver. This driver uses the fw_attributes
> + * class to expose the various WMI functions that many gaming and some
> + * non-gaming ASUS laptops have available.
> + * These typically don't fit anywhere else in the sysfs such as under LED class,
> + * hwmon or other, and are set in Windows using the ASUS Armoury Crate tool.
> + *
> + * Copyright(C) 2010 Intel Corporation.
> + * Copyright(C) 2024-2024 Luke Jones <luke@...nes.dev>
> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/platform_data/x86/asus-wmi.h>
> +#include <linux/errno.h>
> +#include <linux/fs.h>
> +#include <linux/types.h>
> +#include <linux/dmi.h>
> +#include <linux/device.h>
> +#include <linux/kmod.h>
> +#include <linux/kobject.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/kernel.h>
> +#include "asus-armoury.h"
> +#include "firmware_attributes_class.h"
> +
> +#define ASUS_NB_WMI_EVENT_GUID "0B3CBB35-E3C2-45ED-91C2-4C5A6D195D1C"
> +
> +#define ASUS_MINI_LED_MODE_MASK 0x03
> +/* Standard modes for devices with only on/off */
> +#define ASUS_MINI_LED_OFF 0x00
> +#define ASUS_MINI_LED_ON 0x01
> +/* New mode on some devices, define here to clarify remapping later */
> +#define ASUS_MINI_LED_STRONG_MODE 0x02
> +/* New modes for devices with 3 mini-led mode types */
> +#define ASUS_MINI_LED_2024_WEAK 0x00
> +#define ASUS_MINI_LED_2024_STRONG 0x01
> +#define ASUS_MINI_LED_2024_OFF 0x02
> +
> +/* Default limits for tunables available on ASUS ROG laptops */
> +#define PPT_CPU_LIMIT_MIN 5
> +#define PPT_CPU_LIMIT_MAX 150
> +#define PPT_CPU_LIMIT_DEFAULT 80
> +#define PPT_PLATFORM_MIN 5
> +#define PPT_PLATFORM_MAX 100
> +#define PPT_PLATFORM_DEFAULT 80
> +#define NVIDIA_BOOST_MIN 5
> +#define NVIDIA_BOOST_MAX 25
> +#define NVIDIA_TEMP_MIN 75
> +#define NVIDIA_TEMP_MAX 87
> +
> +/* Tunables provided by ASUS for gaming laptops */
> +struct rog_tunables {
> +	u32 cpu_default;
> +	u32 cpu_min;
> +	u32 cpu_max;
> +
> +	u32 platform_default;
> +	u32 platform_min;
> +	u32 platform_max;
> +
> +	u32 ppt_pl1_spl; // cpu
> +	u32 ppt_pl2_sppt; // cpu
> +	u32 ppt_apu_sppt; // plat
> +	u32 ppt_platform_sppt; // plat
> +	u32 ppt_fppt; // cpu
> +
> +	u32 nv_boost_default;
> +	u32 nv_boost_min;
> +	u32 nv_boost_max;
> +	u32 nv_dynamic_boost;
> +
> +	u32 nv_temp_default;
> +	u32 nv_temp_min;
> +	u32 nv_temp_max;
> +	u32 nv_temp_target;
> +};
> +
> +static const struct class *fw_attr_class;
> +
> +struct asus_armoury_priv {
> +	struct device *fw_attr_dev;
> +	struct kset *fw_attr_kset;
> +
> +	struct rog_tunables *rog_tunables;
> +	u32 mini_led_dev_id;
> +	u32 gpu_mux_dev_id;
> +
> +	struct mutex mutex;
> +};
> +
> +static struct asus_armoury_priv asus_armoury = { .mutex = __MUTEX_INITIALIZER(
> +							 asus_armoury.mutex) };

Please put the mutex member on own line.

> +
> +struct fw_attrs_group {
> +	u32 pending_reboot;
> +};
> +
> +static struct fw_attrs_group fw_attrs = {
> +	.pending_reboot = 0,
> +};
> +
> +struct asus_attr_group {
> +	const struct attribute_group *attr_group;
> +	u32 wmi_devid;
> +};
> +
> +/**
> + * asus_wmi_is_present() - determine if a WMI interface is available.
> + * @dev_id: The WMI function ID to use.
> + *
> + * Returns: Boolean state. Note that an error will also return false.
> + */
> +static bool asus_wmi_is_present(u32 dev_id)
> +{
> +	u32 retval;
> +	int status;
> +
> +	status = asus_wmi_get_devstate_dsts(dev_id, &retval);
> +	pr_debug("%s called (0x%08x), retval: 0x%08x\n", __func__, dev_id, retval);
> +
> +	return status == 0 && (retval & ASUS_WMI_DSTS_PRESENCE_BIT);
> +}
> +
> +static void asus_set_reboot_and_signal_event(void)
> +{
> +	fw_attrs.pending_reboot = 1;
> +	kobject_uevent(&asus_armoury.fw_attr_dev->kobj, KOBJ_CHANGE);
> +}
> +
> +static ssize_t pending_reboot_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
> +{
> +	return sysfs_emit(buf, "%u\n", fw_attrs.pending_reboot);
> +}
> +
> +static struct kobj_attribute pending_reboot = __ATTR_RO(pending_reboot);
> +
> +static bool asus_bios_requires_reboot(struct kobj_attribute *attr)
> +{
> +	return !strcmp(attr->attr.name, "gpu_mux_mode") ||
> +	       !strcmp(attr->attr.name, "panel_hd_mode");
> +}
> +
> +/**
> + * attr_int_store() - Generic store function for use with most WMI functions.
> + * @kobj: Pointer to the driver object.
> + * @kobj_attribute: Pointer the attribute calling this function.
> + * @buf: The buffer to read from, this is parsed to `int` type.
> + * @count:
> + * @min: Minimum accepted value. Below this returns -EINVAL.
> + * @max: Maximum accepted value. Above this returns -EINVAL.
> + * @store_value: Pointer to where the parsed value should be stored.
> + * @wmi_dev: The WMI function ID to use.
> + *
> + * The WMI functions available on most ASUS laptops return a 1 as "success", and
> + * a 0 as failed. However some functions can return n > 1 for additional errors.
> + * attr_int_store() currently treats all values which are not 1 as errors, ignoring
> + * the possible differences in WMI error returns.
> + *
> + * Returns: Either count, or an error.
> + */
> +static ssize_t attr_int_store(struct kobject *kobj, struct kobj_attribute *attr,
> +			      const char *buf, size_t count, u32 min, u32 max, u32 *store_value,
> +			      u32 wmi_dev)
> +{
> +	u32 result, value;
> +	int err;
> +
> +	err = kstrtouint(buf, 10, &value);
> +	if (err)
> +		return err;
> +
> +	if (value < min || value > max)
> +		return -EINVAL;
> +
> +	err = asus_wmi_set_devstate(wmi_dev, value, &result);
> +	if (err) {
> +		pr_err("Failed to set %s: %d\n", attr->attr.name, err);
> +		return err;
> +	}
> +
> +	if (result != 1) {
> +		pr_err("Failed to set %s (result): 0x%x\n", attr->attr.name, result);
> +		return -EIO;
> +	}
> +
> +	if (store_value != NULL)
> +		*store_value = value;
> +	sysfs_notify(kobj, NULL, attr->attr.name);
> +
> +	if (asus_bios_requires_reboot(attr))
> +		asus_set_reboot_and_signal_event();
> +
> +	return count;
> +}
> +
> +/* Mini-LED mode **************************************************************/
> +static ssize_t mini_led_mode_current_value_show(struct kobject *kobj,
> +						struct kobj_attribute *attr, char *buf)
> +{
> +	u32 value;
> +	int err;
> +
> +	err = asus_wmi_get_devstate_dsts(asus_armoury.mini_led_dev_id, &value);
> +	if (err)
> +		return err;
> +
> +	value = value & ASUS_MINI_LED_MODE_MASK;

value &= ASUS_MINI_LED_MODE_MASK;

> +
> +	/*
> +	 * Remap the mode values to match previous generation mini-led. The last gen

LED

> +	 * WMI 0 == off, while on this version WMI 2 ==off (flipped).

inconsistent spaces.

> +	 */
> +	if (asus_armoury.mini_led_dev_id == ASUS_WMI_DEVID_MINI_LED_MODE2) {
> +		switch (value) {
> +		case ASUS_MINI_LED_2024_WEAK:
> +			value = ASUS_MINI_LED_ON;
> +			break;
> +		case ASUS_MINI_LED_2024_STRONG:
> +			value = ASUS_MINI_LED_STRONG_MODE;
> +			break;
> +		case ASUS_MINI_LED_2024_OFF:
> +			value = ASUS_MINI_LED_OFF;
> +			break;
> +		}
> +	}
> +
> +	return sysfs_emit(buf, "%u\n", value);
> +}
> +
> +static ssize_t mini_led_mode_current_value_store(struct kobject *kobj,
> +						 struct kobj_attribute *attr, const char *buf,
> +						 size_t count)
> +{
> +	int result, err;
> +	u32 mode;
> +
> +	err = kstrtou32(buf, 10, &mode);
> +	if (err)
> +		return err;
> +
> +	if (asus_armoury.mini_led_dev_id == ASUS_WMI_DEVID_MINI_LED_MODE &&
> +	    mode > ASUS_MINI_LED_ON)
> +		return -EINVAL;
> +	if (asus_armoury.mini_led_dev_id == ASUS_WMI_DEVID_MINI_LED_MODE2 &&
> +	    mode > ASUS_MINI_LED_STRONG_MODE)
> +		return -EINVAL;
> +
> +	/*
> +	 * Remap the mode values so expected behaviour is the same as the last
> +	 * generation of mini-LED with 0 == off, 1 == on.
> +	 */
> +	if (asus_armoury.mini_led_dev_id == ASUS_WMI_DEVID_MINI_LED_MODE2) {
> +		switch (mode) {
> +		case ASUS_MINI_LED_OFF:
> +			mode = ASUS_MINI_LED_2024_OFF;
> +			break;
> +		case ASUS_MINI_LED_ON:
> +			mode = ASUS_MINI_LED_2024_WEAK;
> +			break;
> +		case ASUS_MINI_LED_STRONG_MODE:
> +			mode = ASUS_MINI_LED_2024_STRONG;
> +			break;
> +		}
> +	}
> +
> +	err = asus_wmi_set_devstate(asus_armoury.mini_led_dev_id, mode, &result);
> +	if (err) {
> +		pr_warn("Failed to set mini-LED: %d\n", err);
> +		return err;
> +	}
> +
> +	if (result != 1) {
> +		pr_warn("Failed to set mini-LED mode (result): 0x%x\n", result);
> +		return -EIO;
> +	}
> +
> +	sysfs_notify(kobj, NULL, attr->attr.name);
> +
> +	return count;
> +}
> +
> +static ssize_t mini_led_mode_possible_values_show(struct kobject *kobj,
> +						  struct kobj_attribute *attr, char *buf)
> +{
> +	switch (asus_armoury.mini_led_dev_id) {
> +	case ASUS_WMI_DEVID_MINI_LED_MODE:
> +		return sysfs_emit(buf, "0;1\n");
> +	case ASUS_WMI_DEVID_MINI_LED_MODE2:
> +		return sysfs_emit(buf, "0;1;2\n");
> +	}
> +
> +	return sysfs_emit(buf, "0\n");
> +}
> +
> +ATTR_GROUP_ENUM_CUSTOM(mini_led_mode, "mini_led_mode", "Set the mini-LED backlight mode");
> +
> +static ssize_t gpu_mux_mode_current_value_store(struct kobject *kobj,
> +						struct kobj_attribute *attr, const char *buf,
> +						size_t count)
> +{
> +	int result, err;
> +	u32 optimus;
> +
> +	err = kstrtou32(buf, 10, &optimus);
> +	if (err)
> +		return err;
> +
> +	if (optimus > 1)
> +		return -EINVAL;
> +
> +	if (asus_wmi_is_present(ASUS_WMI_DEVID_DGPU)) {
> +		err = asus_wmi_get_devstate_dsts(ASUS_WMI_DEVID_DGPU, &result);
> +		if (err)
> +			return err;
> +		if (result && !optimus) {
> +			err = -ENODEV;
> +			pr_warn("Can not switch MUX to dGPU mode when dGPU is disabled: %d\n",
> +				err);
> +			return err;
> +		}
> +	}
> +
> +	if (asus_wmi_is_present(ASUS_WMI_DEVID_EGPU)) {
> +		err = asus_wmi_get_devstate_dsts(ASUS_WMI_DEVID_EGPU, &result);
> +		if (err)
> +			return err;
> +		if (result && !optimus) {
> +			err = -ENODEV;
> +			pr_warn("Can not switch MUX to dGPU mode when eGPU is enabled: %d\n",
> +				err);
> +			return err;
> +		}
> +	}
> +
> +	err = asus_wmi_set_devstate(asus_armoury.gpu_mux_dev_id, optimus, &result);
> +	if (err) {
> +		pr_err("Failed to set GPU MUX mode: %d\nn", err);

Double n at the end of the string.

> +		return err;
> +	}
> +	/* !1 is considered a fail by ASUS */
> +	if (result != 1) {
> +		pr_warn("Failed to set GPU MUX mode (result): 0x%x\n", result);
> +		return -EIO;
> +	}
> +
> +	sysfs_notify(kobj, NULL, attr->attr.name);
> +
> +	return count;
> +}
> +WMI_SHOW_INT(gpu_mux_mode_current_value, "%d\n", asus_armoury.gpu_mux_dev_id);
> +ATTR_GROUP_BOOL_CUSTOM(gpu_mux_mode, "gpu_mux_mode", "Set the GPU display MUX mode");
> +
> +/*
> + * A user may be required to store the value twice, typcial store first, then

typical

> + * rescan PCI bus to activate power, then store a second time to save correctly.
> + * The reason for this is that an extra code path in the ACPI is enabled when
> + * the device and bus are powered.
> + */
> +static ssize_t dgpu_disable_current_value_store(struct kobject *kobj,
> +						struct kobj_attribute *attr, const char *buf,
> +						size_t count)
> +{
> +	int result, err;
> +	u32 disable;
> +
> +	err = kstrtou32(buf, 10, &disable);
> +	if (err)
> +		return err;
> +
> +	if (disable > 1)
> +		return -EINVAL;
> +
> +	if (asus_armoury.gpu_mux_dev_id) {
> +		err = asus_wmi_get_devstate_dsts(asus_armoury.gpu_mux_dev_id, &result);
> +		if (err)
> +			return err;
> +		if (!result && disable) {
> +			err = -ENODEV;
> +			pr_warn("Can not disable dGPU when the MUX is in dGPU mode: %d\n", err);
> +			return err;
> +		}
> +	}
> +
> +	err = asus_wmi_set_devstate(ASUS_WMI_DEVID_DGPU, disable, &result);
> +	if (err) {
> +		pr_warn("Failed to set dgpu disable: %d\n", err);
> +		return err;
> +	}
> +
> +	if (result != 1) {
> +		pr_warn("Failed to set dgpu disable (result): 0x%x\n", result);
> +		return -EIO;
> +	}
> +
> +	sysfs_notify(kobj, NULL, attr->attr.name);
> +
> +	return count;
> +}
> +WMI_SHOW_INT(dgpu_disable_current_value, "%d\n", ASUS_WMI_DEVID_DGPU);
> +ATTR_GROUP_BOOL_CUSTOM(dgpu_disable, "dgpu_disable", "Disable the dGPU");
> +
> +/* The ACPI call to enable the eGPU also disables the internal dGPU */
> +static ssize_t egpu_enable_current_value_store(struct kobject *kobj,
> +					       struct kobj_attribute *attr, const char *buf,
> +					       size_t count)
> +{
> +	int result, err;
> +	u32 enable;
> +
> +	err = kstrtou32(buf, 10, &enable);
> +	if (err)
> +		return err;
> +
> +	if (enable > 1)
> +		return -EINVAL;
> +
> +	err = asus_wmi_get_devstate_dsts(ASUS_WMI_DEVID_EGPU_CONNECTED, &result);
> +	if (err) {
> +		pr_warn("Failed to get egpu connection status: %d\n", err);

eGPU

> +		return err;
> +	}
> +
> +	if (asus_armoury.gpu_mux_dev_id) {
> +		err = asus_wmi_get_devstate_dsts(asus_armoury.gpu_mux_dev_id, &result);
> +		if (err) {
> +			pr_warn("Failed to get gpu mux status: %d\n", result);

GPU MUX

> +			return result;
> +		}
> +		if (!result && enable) {
> +			err = -ENODEV;
> +			pr_warn("Can not enable eGPU when the MUX is in dGPU mode: %d\n", err);
> +			return err;
> +		}
> +	}
> +
> +	err = asus_wmi_set_devstate(ASUS_WMI_DEVID_EGPU, enable, &result);
> +	if (err) {
> +		pr_warn("Failed to set egpu state: %d\n", err);

eGPU

> +		return err;
> +	}
> +
> +	if (result != 1) {
> +		pr_warn("Failed to set egpu state (retval): 0x%x\n", result);

eGPU

> +		return -EIO;
> +	}
> +
> +	sysfs_notify(kobj, NULL, attr->attr.name);
> +
> +	return count;
> +}
> +WMI_SHOW_INT(egpu_enable_current_value, "%d\n", ASUS_WMI_DEVID_EGPU);
> +ATTR_GROUP_BOOL_CUSTOM(egpu_enable, "egpu_enable", "Enable the eGPU (also disables dGPU)");
> +
> +/* Simple attribute creation */
> +ATTR_GROUP_ROG_TUNABLE(ppt_pl1_spl, "ppt_pl1_spl", ASUS_WMI_DEVID_PPT_PL1_SPL, cpu_default,
> +		       cpu_min, cpu_max, 1, "Set the CPU slow package limit");
> +ATTR_GROUP_ROG_TUNABLE(ppt_pl2_sppt, "ppt_pl2_sppt", ASUS_WMI_DEVID_PPT_PL2_SPPT, cpu_default,
> +		       cpu_min, cpu_max, 1, "Set the CPU fast package limit");
> +ATTR_GROUP_ROG_TUNABLE(ppt_apu_sppt, "ppt_apu_sppt", ASUS_WMI_DEVID_PPT_APU_SPPT,
> +		       platform_default, platform_min, platform_max, 1,
> +		       "Set the CPU slow package limit");
> +ATTR_GROUP_ROG_TUNABLE(ppt_platform_sppt, "ppt_platform_sppt", ASUS_WMI_DEVID_PPT_PLAT_SPPT,
> +		       platform_default, platform_min, platform_max, 1,
> +		       "Set the CPU slow package limit");
> +ATTR_GROUP_ROG_TUNABLE(ppt_fppt, "ppt_fppt", ASUS_WMI_DEVID_PPT_FPPT, cpu_default, cpu_min,
> +		       cpu_max, 1, "Set the CPU slow package limit");
> +
> +ATTR_GROUP_ROG_TUNABLE(nv_dynamic_boost, "nv_dynamic_boost", ASUS_WMI_DEVID_NV_DYN_BOOST,
> +		       nv_boost_default, nv_boost_min, nv_boost_max, 1,
> +		       "Set the Nvidia dynamic boost limit");
> +ATTR_GROUP_ROG_TUNABLE(nv_temp_target, "nv_temp_target", ASUS_WMI_DEVID_NV_THERM_TARGET,
> +		       nv_temp_default, nv_boost_min, nv_temp_max, 1,
> +		       "Set the Nvidia max thermal limit");
> +
> +ATTR_GROUP_ENUM_INT_RO(charge_mode, "charge_mode", ASUS_WMI_DEVID_CHARGE_MODE, "0;1;2",
> +		       "Show the current mode of charging");
> +ATTR_GROUP_BOOL_RW(boot_sound, "boot_sound", ASUS_WMI_DEVID_BOOT_SOUND,
> +		   "Set the boot POST sound");
> +ATTR_GROUP_BOOL_RW(mcu_powersave, "mcu_powersave", ASUS_WMI_DEVID_MCU_POWERSAVE,
> +		   "Set MCU powersaving mode");
> +ATTR_GROUP_BOOL_RW(panel_od, "panel_overdrive", ASUS_WMI_DEVID_PANEL_OD,
> +		   "Set the panel refresh overdrive");
> +ATTR_GROUP_BOOL_RW(panel_hd_mode, "panel_hd_mode", ASUS_WMI_DEVID_PANEL_HD,
> +		   "Set the panel HD mode to UHD<0> or FHD<1>");
> +ATTR_GROUP_BOOL_RO(egpu_connected, "egpu_connected", ASUS_WMI_DEVID_EGPU_CONNECTED,
> +		   "Show the eGPU connection status");
> +
> +/* If an attribute does not require any special case handling add it here */
> +static const struct asus_attr_group armoury_attr_groups[] = {
> +	{ &egpu_connected_attr_group, ASUS_WMI_DEVID_EGPU_CONNECTED },
> +	{ &egpu_enable_attr_group, ASUS_WMI_DEVID_EGPU },
> +	{ &dgpu_disable_attr_group, ASUS_WMI_DEVID_DGPU },
> +
> +	{ &ppt_pl1_spl_attr_group, ASUS_WMI_DEVID_PPT_PL1_SPL },
> +	{ &ppt_pl2_sppt_attr_group, ASUS_WMI_DEVID_PPT_PL2_SPPT },
> +	{ &ppt_apu_sppt_attr_group, ASUS_WMI_DEVID_PPT_APU_SPPT },
> +	{ &ppt_platform_sppt_attr_group, ASUS_WMI_DEVID_PPT_PLAT_SPPT },
> +	{ &ppt_fppt_attr_group, ASUS_WMI_DEVID_PPT_FPPT },
> +	{ &nv_dynamic_boost_attr_group, ASUS_WMI_DEVID_NV_DYN_BOOST },
> +	{ &nv_temp_target_attr_group, ASUS_WMI_DEVID_NV_THERM_TARGET },
> +
> +	{ &charge_mode_attr_group, ASUS_WMI_DEVID_CHARGE_MODE },
> +	{ &boot_sound_attr_group, ASUS_WMI_DEVID_BOOT_SOUND },
> +	{ &mcu_powersave_attr_group, ASUS_WMI_DEVID_MCU_POWERSAVE },
> +	{ &panel_od_attr_group, ASUS_WMI_DEVID_PANEL_OD },
> +	{ &panel_hd_mode_attr_group, ASUS_WMI_DEVID_PANEL_HD },
> +};
> +
> +static int asus_fw_attr_add(void)
> +{
> +	int err;
> +
> +	err = fw_attributes_class_get(&fw_attr_class);
> +	if (err)
> +		goto fail_class_created;
> +
> +	asus_armoury.fw_attr_dev =
> +		device_create(fw_attr_class, NULL, MKDEV(0, 0), NULL, "%s", DRIVER_NAME);
> +
> +	if (IS_ERR(asus_armoury.fw_attr_dev)) {
> +		err = PTR_ERR(asus_armoury.fw_attr_dev);
> +		goto fail_class_created;
> +	}
> +
> +	asus_armoury.fw_attr_kset =
> +		kset_create_and_add("attributes", NULL, &asus_armoury.fw_attr_dev->kobj);
> +	if (!asus_armoury.fw_attr_dev) {
> +		err = -ENOMEM;
> +		pr_debug("Failed to create and add attributes\n");
> +		goto err_destroy_classdev;
> +	}
> +
> +	err = sysfs_create_file(&asus_armoury.fw_attr_kset->kobj, &pending_reboot.attr);
> +	if (err) {
> +		pr_warn("Failed to create sysfs level attributes\n");
> +		goto fail_class_created;
> +	}
> +
> +	err = 0;
> +	asus_armoury.mini_led_dev_id = 0;
> +	if (asus_wmi_is_present(ASUS_WMI_DEVID_MINI_LED_MODE)) {
> +		asus_armoury.mini_led_dev_id = ASUS_WMI_DEVID_MINI_LED_MODE;
> +		err = sysfs_create_group(&asus_armoury.fw_attr_kset->kobj,
> +					 &mini_led_mode_attr_group);
> +	} else if (asus_wmi_is_present(ASUS_WMI_DEVID_MINI_LED_MODE2)) {
> +		asus_armoury.mini_led_dev_id = ASUS_WMI_DEVID_MINI_LED_MODE2;
> +		err = sysfs_create_group(&asus_armoury.fw_attr_kset->kobj,
> +					 &mini_led_mode_attr_group);
> +	}
> +	if (err)
> +		pr_warn("Failed to create sysfs-group for mini_led\n");
> +
> +	err = 0;
> +	asus_armoury.gpu_mux_dev_id = 0;
> +	if (asus_wmi_is_present(ASUS_WMI_DEVID_GPU_MUX)) {
> +		asus_armoury.gpu_mux_dev_id = ASUS_WMI_DEVID_GPU_MUX;
> +		err = sysfs_create_group(&asus_armoury.fw_attr_kset->kobj,
> +					 &gpu_mux_mode_attr_group);
> +	} else if (asus_wmi_is_present(ASUS_WMI_DEVID_GPU_MUX_VIVO)) {
> +		asus_armoury.gpu_mux_dev_id = ASUS_WMI_DEVID_GPU_MUX_VIVO;
> +		err = sysfs_create_group(&asus_armoury.fw_attr_kset->kobj,
> +					 &gpu_mux_mode_attr_group);
> +	}
> +	if (err)
> +		pr_warn("Failed to create sysfs-group for gpu_mux\n");
> +
> +	for (int i = 0; i < ARRAY_SIZE(armoury_attr_groups); i++) {
> +		if (!asus_wmi_is_present(armoury_attr_groups[i].wmi_devid))
> +			continue;
> +
> +		err = sysfs_create_group(&asus_armoury.fw_attr_kset->kobj,
> +					 armoury_attr_groups[i].attr_group);
> +		if (err)
> +			pr_warn("Failed to create sysfs-group for %s\n",
> +				armoury_attr_groups[i].attr_group->name);
> +		else
> +			pr_debug("Created sysfs-group for %s\n",
> +				 armoury_attr_groups[i].attr_group->name);
> +	}
> +
> +	return 0;
> +
> +err_destroy_classdev:
> +	device_destroy(fw_attr_class, MKDEV(0, 0));
> +
> +fail_class_created:
> +	fw_attributes_class_put();
> +	return err;
> +}
> +
> +/* Init / exit ****************************************************************/
> +
> +/* Set up the min/max and defaults for ROG tunables */
> +static void init_rog_tunables(struct rog_tunables *rog)
> +{
> +	const char *product;
> +	u32 max_boost = NVIDIA_BOOST_MAX;
> +	u32 cpu_default = PPT_CPU_LIMIT_DEFAULT;
> +	u32 cpu_max = PPT_CPU_LIMIT_MAX;
> +	u32 platform_default = PPT_PLATFORM_DEFAULT;
> +	u32 platform_max = PPT_PLATFORM_MAX;
> +
> +	/*
> +	 * ASUS product_name contains everything required, e.g,
> +	 * "ROG Flow X16 GV601VV_GV601VV_00185149B"
> +	 */
> +	product = dmi_get_system_info(DMI_PRODUCT_NAME);
> +
> +	if (strstr(product, "GA402R")) {
> +		cpu_default = 125;
> +	} else if (strstr(product, "13QY")) {
> +		cpu_max = 250;
> +	} else if (strstr(product, "X13")) {
> +		cpu_max = 75;
> +		cpu_default = 50;
> +	} else if (strstr(product, "RC71")) {
> +		cpu_max = 50;
> +		cpu_default = 30;
> +	} else if (strstr(product, "G814") || strstr(product, "G614") ||
> +		   strstr(product, "G834") || strstr(product, "G634")) {
> +		cpu_max = 175;
> +	} else if (strstr(product, "GA402X") || strstr(product, "GA403") ||
> +		   strstr(product, "FA507N") || strstr(product, "FA507X") ||
> +		   strstr(product, "FA707N") || strstr(product, "FA707X")) {
> +		cpu_max = 90;
> +	}
> +
> +	if (strstr(product, "GZ301ZE"))
> +		max_boost = 5;
> +	else if (strstr(product, "FX507ZC4"))
> +		max_boost = 15;
> +	else if (strstr(product, "GU605"))
> +		max_boost = 20;

It would be nice if driver_data could be used to store per model 
information rather than using if forests. It's a bit tricky to realize 
with dmi_check_system() though, only because you've rog available on 
global level, a callback could store info directly into rog fields but it 
doesn't not feel very clean solution having to have a global variable.

> +	/* ensure defaults for tunables */
> +	rog->cpu_default = cpu_default;
> +	rog->cpu_min = PPT_CPU_LIMIT_MIN;
> +	rog->cpu_max = cpu_max;
> +
> +	rog->platform_default = platform_default;
> +	rog->platform_max = PPT_PLATFORM_MIN;
> +	rog->platform_max = platform_max;
> +
> +	rog->ppt_pl1_spl = cpu_default;
> +	rog->ppt_pl2_sppt = cpu_default;
> +	rog->ppt_apu_sppt = cpu_default;
> +
> +	rog->ppt_platform_sppt = platform_default;
> +	rog->ppt_fppt = platform_default;
> +
> +	rog->nv_boost_default = NVIDIA_BOOST_MAX;
> +	rog->nv_boost_max = NVIDIA_BOOST_MIN;
> +	rog->nv_boost_max = max_boost;
> +	rog->nv_dynamic_boost = NVIDIA_BOOST_MIN;
> +
> +	rog->nv_temp_default = NVIDIA_TEMP_MAX;
> +	rog->nv_temp_max = NVIDIA_TEMP_MIN;
> +	rog->nv_temp_max = NVIDIA_TEMP_MAX;
> +	rog->nv_temp_target = NVIDIA_TEMP_MIN;
> +}
> +
> +static int __init asus_fw_init(void)
> +{
> +	int err;
> +
> +	fw_attrs.pending_reboot = 0;
> +
> +	mutex_lock(&asus_armoury.mutex);
> +
> +	asus_armoury.rog_tunables = kzalloc(sizeof(struct rog_tunables), GFP_KERNEL);
> +	if (!asus_armoury.rog_tunables) {
> +		mutex_unlock(&asus_armoury.mutex);

Please use guard() to make this function much simpler. But why you need 
to take mutex here at all?

> +		return -ENOMEM;
> +	}
> +	init_rog_tunables(asus_armoury.rog_tunables);
> +
> +	err = asus_fw_attr_add();
> +	mutex_unlock(&asus_armoury.mutex);
> +	if (err)
> +		return err;
> +
> +	return 0;
> +}
> +
> +static void __exit asus_fw_exit(void)
> +{
> +	mutex_lock(&asus_armoury.mutex);
> +
> +	sysfs_remove_file(&asus_armoury.fw_attr_kset->kobj, &pending_reboot.attr);
> +	kset_unregister(asus_armoury.fw_attr_kset);
> +	device_destroy(fw_attr_class, MKDEV(0, 0));
> +	fw_attributes_class_put();
> +
> +	mutex_unlock(&asus_armoury.mutex);
> +}
> +
> +module_init(asus_fw_init);
> +module_exit(asus_fw_exit);
> +
> +MODULE_AUTHOR("Luke Jones <luke@...nes.dev>");
> +MODULE_DESCRIPTION("ASUS BIOS Configuration Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("wmi:" ASUS_NB_WMI_EVENT_GUID);
> diff --git a/drivers/platform/x86/asus-armoury.h b/drivers/platform/x86/asus-armoury.h
> new file mode 100644
> index 000000000000..146170f91e69
> --- /dev/null
> +++ b/drivers/platform/x86/asus-armoury.h
> @@ -0,0 +1,195 @@
> +/* SPDX-License-Identifier: GPL-2.0
> + *
> + * Definitions for kernel modules using asus-armoury driver
> + *
> + *  Copyright (c) 2024 Luke Jones <luke@...nes.dev>
> + */
> +
> +#ifndef _ASUS_BIOSCFG_H_
> +#define _ASUS_BIOSCFG_H_
> +
> +#include <linux/types.h>

This is missing some includes for structs and functions you use below.

> +
> +#define DRIVER_NAME "asus-armoury"
> +
> +static ssize_t attr_int_store(struct kobject *kobj, struct kobj_attribute *attr,
> +			      const char *buf, size_t count, u32 min, u32 max, u32 *store_value,
> +			      u32 wmi_dev);
> +
> +static ssize_t int_type_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)

inline missing

> +{
> +	return sysfs_emit(buf, "integer\n");

Lukas Wunner might have done something to make emitting constant strings 
easier, please check out if that's already in mainline.

> +}
> +
> +static ssize_t enum_type_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)

inline missing

> +{
> +	return sysfs_emit(buf, "enumeration\n");
> +}
> +
> +#define __ASUS_ATTR_RO(_func, _name)                                  \
> +	{                                                             \
> +		.attr = { .name = __stringify(_name), .mode = 0444 }, \
> +		.show = _func##_##_name##_show,                       \
> +	}
> +
> +#define __ASUS_ATTR_RO_AS(_name, _show)                               \
> +	{                                                             \
> +		.attr = { .name = __stringify(_name), .mode = 0444 }, \
> +		.show = _show,                                        \
> +	}
> +
> +#define __ASUS_ATTR_RW(_func, _name) \
> +	__ATTR(_name, 0644, _func##_##_name##_show, _func##_##_name##_store)
> +
> +#define __WMI_STORE_INT(_attr, _min, _max, _wmi)                                        \
> +	static ssize_t _attr##_store(struct kobject *kobj, struct kobj_attribute *attr, \
> +				     const char *buf, size_t count)                     \
> +	{                                                                               \
> +		return attr_int_store(kobj, attr, buf, count, _min, _max, NULL, _wmi);  \
> +	}
> +
> +#define WMI_SHOW_INT(_attr, _fmt, _wmi)                                                \
> +	static ssize_t _attr##_show(struct kobject *kobj, struct kobj_attribute *attr, \
> +				    char *buf)                                         \
> +	{                                                                              \
> +		u32 result;                                                            \
> +		int err;                                                               \
> +		err = asus_wmi_get_devstate_dsts(_wmi, &result);                       \
> +		if (err)                                                               \
> +			return err;                                                    \
> +		return sysfs_emit(buf, _fmt, result & ~ASUS_WMI_DSTS_PRESENCE_BIT);    \
> +	}
> +
> +/* Create functions and attributes for use in other macros or on their own */
> +
> +#define __ATTR_CURRENT_INT_RO(_attr, _wmi)                          \
> +	WMI_SHOW_INT(_attr##_current_value, "%d\n", _wmi);          \
> +	static struct kobj_attribute attr_##_attr##_current_value = \
> +		__ASUS_ATTR_RO(_attr, current_value)
> +
> +#define __ATTR_CURRENT_INT_RW(_attr, _minv, _maxv, _wmi)            \
> +	__WMI_STORE_INT(_attr##_current_value, _minv, _maxv, _wmi); \
> +	WMI_SHOW_INT(_attr##_current_value, "%d\n", _wmi);          \
> +	static struct kobj_attribute attr_##_attr##_current_value = \
> +		__ASUS_ATTR_RW(_attr, current_value)
> +
> +/* Shows a formatted static variable */
> +#define __ATTR_SHOW_FMT(_prop, _attrname, _fmt, _val)                                     \
> +	static ssize_t _attrname##_##_prop##_show(struct kobject *kobj,                   \
> +						  struct kobj_attribute *attr, char *buf) \
> +	{                                                                                 \
> +		return sysfs_emit(buf, _fmt, _val);                                       \
> +	}                                                                                 \
> +	static struct kobj_attribute attr_##_attrname##_##_prop =                         \
> +		__ASUS_ATTR_RO(_attrname, _prop)
> +
> +/* Boolean style enumeration, base macro. Requires adding show/store */
> +#define __ATTR_GROUP_ENUM(_attrname, _fsname, _possible, _dispname)                            \
> +	__ATTR_SHOW_FMT(display_name, _attrname, "%s\n", _dispname);                           \
> +	__ATTR_SHOW_FMT(possible_values, _attrname, "%s\n", _possible);                        \
> +	static struct kobj_attribute attr_##_attrname##_type =                                 \
> +		__ASUS_ATTR_RO_AS(type, enum_type_show);                                       \
> +	static struct attribute *_attrname##_attrs[] = {                                       \
> +		&attr_##_attrname##_current_value.attr, &attr_##_attrname##_display_name.attr, \
> +		&attr_##_attrname##_possible_values.attr, &attr_##_attrname##_type.attr, NULL  \
> +	};                                                                                     \
> +	static const struct attribute_group _attrname##_attr_group = {                         \
> +		.name = _fsname, .attrs = _attrname##_attrs                                    \
> +	}
> +
> +#define ATTR_GROUP_BOOL_RO(_attrname, _fsname, _wmi, _dispname) \
> +	__ATTR_CURRENT_INT_RO(_attrname, _wmi);                 \
> +	__ATTR_GROUP_ENUM(_attrname, _fsname, "0;1", _dispname)
> +
> +#define ATTR_GROUP_BOOL_RW(_attrname, _fsname, _wmi, _dispname) \
> +	__ATTR_CURRENT_INT_RW(_attrname, 0, 1, _wmi);           \
> +	__ATTR_GROUP_ENUM(_attrname, _fsname, "0;1", _dispname)
> +
> +/*
> + * Requires <name>_current_value_show(), <name>_current_value_show()
> + */
> +#define ATTR_GROUP_BOOL_CUSTOM(_attrname, _fsname, _dispname)           \
> +	static struct kobj_attribute attr_##_attrname##_current_value = \
> +		__ASUS_ATTR_RW(_attrname, current_value);               \
> +	__ATTR_GROUP_ENUM(_attrname, _fsname, "0;1", _dispname)
> +
> +#define ATTR_GROUP_ENUM_INT_RO(_attrname, _fsname, _wmi, _possible, _dispname) \
> +	__ATTR_CURRENT_INT_RO(_attrname, _wmi);                                \
> +	__ATTR_GROUP_ENUM(_attrname, _fsname, _possible, _dispname)
> +
> +/*
> + * Requires <name>_current_value_show(), <name>_current_value_show()
> + * and <name>_possible_values_show()
> + */
> +#define ATTR_GROUP_ENUM_CUSTOM(_attrname, _fsname, _dispname)                                  \
> +	__ATTR_SHOW_FMT(display_name, _attrname, "%s\n", _dispname);                           \
> +	static struct kobj_attribute attr_##_attrname##_current_value =                        \
> +		__ASUS_ATTR_RW(_attrname, current_value);                                      \
> +	static struct kobj_attribute attr_##_attrname##_possible_values =                      \
> +		__ASUS_ATTR_RO(_attrname, possible_values);                                    \
> +	static struct kobj_attribute attr_##_attrname##_type =                                 \
> +		__ASUS_ATTR_RO_AS(type, enum_type_show);                                       \
> +	static struct attribute *_attrname##_attrs[] = {                                       \
> +		&attr_##_attrname##_current_value.attr, &attr_##_attrname##_display_name.attr, \
> +		&attr_##_attrname##_possible_values.attr, &attr_##_attrname##_type.attr, NULL  \
> +	};                                                                                     \
> +	static const struct attribute_group _attrname##_attr_group = {                         \
> +		.name = _fsname, .attrs = _attrname##_attrs                                    \
> +	}
> +
> +/*
> + * ROG PPT attributes need a little different in setup as they
> + * require rog_tunables members.
> + */
> +
> +#define __ROG_TUNABLE_RW(_attr, _min, _max, _wmi)                                              \
> +	static ssize_t _attr##_current_value_store(struct kobject *kobj,                       \
> +						   struct kobj_attribute *attr,                \
> +						   const char *buf, size_t count)              \
> +	{                                                                                      \
> +		return attr_int_store(kobj, attr, buf, count, asus_armoury.rog_tunables->_min, \
> +				      asus_armoury.rog_tunables->_max,                         \
> +				      &asus_armoury.rog_tunables->_attr, _wmi);                \
> +	}                                                                                      \
> +	static ssize_t _attr##_current_value_show(struct kobject *kobj,                        \
> +						  struct kobj_attribute *attr, char *buf)      \
> +	{                                                                                      \
> +		return sysfs_emit(buf, "%u\n", asus_armoury.rog_tunables->_attr);              \
> +	}                                                                                      \
> +	static struct kobj_attribute attr_##_attr##_current_value =                            \
> +		__ASUS_ATTR_RW(_attr, current_value)
> +
> +#define __ROG_TUNABLE_SHOW(_prop, _attrname, _val)                                        \
> +	static ssize_t _attrname##_##_prop##_show(struct kobject *kobj,                   \
> +						  struct kobj_attribute *attr, char *buf) \
> +	{                                                                                 \
> +		return sysfs_emit(buf, "%d\n", asus_armoury.rog_tunables->_val);          \
> +	}                                                                                 \
> +	static struct kobj_attribute attr_##_attrname##_##_prop =                         \
> +		__ASUS_ATTR_RO(_attrname, _prop)
> +
> +#define ATTR_GROUP_ROG_TUNABLE(_attrname, _fsname, _wmi, _default, _min, _max, _incstep, \
> +			       _dispname)                                                \
> +	__ROG_TUNABLE_SHOW(default_value, _attrname, _default);                          \
> +	__ROG_TUNABLE_RW(_attrname, _min, _max, _wmi);                                   \
> +	__ROG_TUNABLE_SHOW(min_value, _attrname, _min);                                  \
> +	__ROG_TUNABLE_SHOW(max_value, _attrname, _max);                                  \
> +	__ATTR_SHOW_FMT(scalar_increment, _attrname, "%d\n", _incstep);                  \
> +	__ATTR_SHOW_FMT(display_name, _attrname, "%s\n", _dispname);                     \
> +	static struct kobj_attribute attr_##_attrname##_type =                           \
> +		__ASUS_ATTR_RO_AS(type, int_type_show);                                  \
> +	static struct attribute *_attrname##_attrs[] = {                                 \
> +		&attr_##_attrname##_current_value.attr,                                  \
> +		&attr_##_attrname##_default_value.attr,                                  \
> +		&attr_##_attrname##_min_value.attr,                                      \
> +		&attr_##_attrname##_max_value.attr,                                      \
> +		&attr_##_attrname##_scalar_increment.attr,                               \
> +		&attr_##_attrname##_display_name.attr,                                   \
> +		&attr_##_attrname##_type.attr,                                           \
> +		NULL                                                                     \
> +	};                                                                               \
> +	static const struct attribute_group _attrname##_attr_group = {                   \
> +		.name = _fsname, .attrs = _attrname##_attrs                              \
> +	}
> +
> +#endif /* _ASUS_BIOSCFG_H_ */
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 0c80c6b0399b..165e7932c371 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -550,12 +550,56 @@ static int asus_wmi_get_devstate(struct asus_wmi *asus, u32 dev_id, u32 *retval)
>  	return 0;
>  }
>  
> -static int asus_wmi_set_devstate(u32 dev_id, u32 ctrl_param,
> -				 u32 *retval)
> +/**
> + * asus_wmi_get_devstate_dsts() - Get the WMI function state.
> + * @dev_id: The WMI function to call.
> + * @retval: A pointer to where to store the value returned from WMI.
> + *
> + * The returned WMI function state can also be used to determine if the WMI
> + * function is supported by checking if the asus_wmi_get_devstate_dsts()
> + * returns an error.
> + *
> + * On success the return value is 0, and the retval is a valid value returned
> + * by the successful WMI function call. An error value is returned only if the
> + * WMI function failed, or if it returns "unsupported" which is typically a 0
> + * (no return, and no 'supported' bit set), or a 0xFFFFFFFE (~1) which if not
> + * caught here can result in unexpected behaviour later.
> + */
> +int asus_wmi_get_devstate_dsts(u32 dev_id, u32 *retval)
> +{
> +	int err;
> +
> +	err = asus_wmi_evaluate_method(ASUS_WMI_METHODID_DSTS, dev_id, 0, retval);
> +	if (err)
> +		return err;
> +	/* Be explicit about retval */
> +	if (*retval == 0xFFFFFFFE || *retval == 0)

Please name the literals with defines.

> +		return -ENODEV;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(asus_wmi_get_devstate_dsts);
> +
> +/**
> + * asus_wmi_set_devstate() - Set the WMI function state.
> + * @dev_id: The WMI function to call.
> + * @ctrl_param: The argument to be used for this WMI function.
> + * @retval: A pointer to where to store the value returned from WMI.
> + *
> + * The returned WMI function state if not checked here for error as
> + * asus_wmi_set_devstate() is not called unless first paired with a call to
> + * asus_wmi_get_devstate_dsts() to check that the WMI function is supported.
> + *
> + * On success the return value is 0, and the retval is a valid value returned
> + * by the successful WMI function call. An error value is returned only if the
> + * WMI function failed.
> + */
> +int asus_wmi_set_devstate(u32 dev_id, u32 ctrl_param, u32 *retval)
>  {
>  	return asus_wmi_evaluate_method(ASUS_WMI_METHODID_DEVS, dev_id,
>  					ctrl_param, retval);
>  }
> +EXPORT_SYMBOL_GPL(asus_wmi_set_devstate);

Namespace exports.


-- 
 i.

>  /* Helper for special devices with magic return codes */
>  static int asus_wmi_get_devstate_bits(struct asus_wmi *asus,
> diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
> index b601b245a035..c164e656ae0b 100644
> --- a/include/linux/platform_data/x86/asus-wmi.h
> +++ b/include/linux/platform_data/x86/asus-wmi.h
> @@ -72,6 +72,7 @@
>  #define ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY_VIVO 0x00110019
>  
>  /* Misc */
> +#define ASUS_WMI_DEVID_PANEL_HD		0x0005001C
>  #define ASUS_WMI_DEVID_PANEL_OD		0x00050019
>  #define ASUS_WMI_DEVID_CAMERA		0x00060013
>  #define ASUS_WMI_DEVID_LID_FLIP		0x00060062
> @@ -157,8 +158,18 @@
>  #define ASUS_WMI_DSTS_LIGHTBAR_MASK	0x0000000F
>  
>  #if IS_REACHABLE(CONFIG_ASUS_WMI)
> +int asus_wmi_get_devstate_dsts(u32 dev_id, u32 *retval);
> +int asus_wmi_set_devstate(u32 dev_id, u32 ctrl_param, u32 *retval);
>  int asus_wmi_evaluate_method(u32 method_id, u32 arg0, u32 arg1, u32 *retval);
>  #else
> +static int asus_wmi_get_devstate_dsts(u32 dev_id, u32 *retval)
> +{
> +	return -ENODEV;
> +}
> +static int asus_wmi_set_devstate(u32 dev_id, u32 ctrl_param, u32 *retval)
> +{
> +	return -ENODEV;
> +}
>  static inline int asus_wmi_evaluate_method(u32 method_id, u32 arg0, u32 arg1,
>  					   u32 *retval)
>  {
> 

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