[PATCH v3 2/4] platform/x86: Add Lenovo Gamezone WMI Driver

["Derek J. Clark" <derekjohn.clark@gmail.com>]

Adds lenovo-wmi-gamezone.c which provides a driver for the Lenovo
Gamezone WMI interface that comes on Lenovo "Gaming Series" hardware.
Provides ACPI platform profiles over WMI.

Adds lenovo-wmi.h and lenovo-wmi.c which provide helper functions for
wmidev_evaluate_method as well as prototypes for exported functions.
v3:
- Use notifier chain to report platform profile changes to any
  subscribed drivers.
- Adds THERMAL_MODE_EVENT GUID and .notify function to trigger notifier
  chain.
- Adds support for Extreme Mode profile on supported hardware, as well
  as a DMI quirk table for some devices that report extreme mode version
  support but so not have it fully implemented.
- Update to include recent changes to platform-profile.
v2:
- Use devm_kmalloc to ensure driver can be instanced, remove global
  reference.
- Ensure reverse Christmas tree for all variable declarations.
- Remove extra whitespace.
- Use guard(mutex) in all mutex instances, global mutex.
- Use pr_fmt instead of adding the driver name to each pr_err.
- Remove noisy pr_info usage.
- Rename gamezone_wmi to lenovo_wmi_gz_priv and gz_wmi to priv.
- Remove GZ_WMI symbol exporting.

Signed-off-by: Derek J. Clark <derekjohn.clark@gmail.com>
---
 MAINTAINERS                                |   3 +
 drivers/platform/x86/Kconfig               |  16 +
 drivers/platform/x86/Makefile              |   2 +
 drivers/platform/x86/lenovo-wmi-gamezone.c | 374 +++++++++++++++++++++
 drivers/platform/x86/lenovo-wmi.c          |  77 +++++
 drivers/platform/x86/lenovo-wmi.h          |  62 ++++
 6 files changed, 534 insertions(+)
 create mode 100644 drivers/platform/x86/lenovo-wmi-gamezone.c
 create mode 100644 drivers/platform/x86/lenovo-wmi.c
 create mode 100644 drivers/platform/x86/lenovo-wmi.h

diff --git a/MAINTAINERS b/MAINTAINERS
index e20c32b3c480..cf7f4fce1a25 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13157,6 +13157,9 @@ L:	platform-driver-x86@vger.kernel.org
 S:	Maintained
 F:	Documentation/wmi/devices/lenovo-wmi-gamezone.rst
 F:	Documentation/wmi/devices/lenovo-wmi-other.rst
+F:	drivers/platform/x86/lenovo-wmi-gamezone.c
+F:	drivers/platform/x86/lenovo-wmi.c
+F:	drivers/platform/x86/lenovo-wmi.h
 
 LETSKETCH HID TABLET DRIVER
 M:	Hans de Goede <hdegoede@redhat.com>
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 7e20a58861eb..875822e6bd65 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -459,6 +459,22 @@ config IBM_RTL
 	 state = 0 (BIOS SMIs on)
 	 state = 1 (BIOS SMIs off)
 
+config LENOVO_WMI
+	tristate
+	depends on ACPI_WMI
+
+config LENOVO_WMI_GAMEZONE
+	tristate "Lenovo GameZone WMI Driver"
+	depends on ACPI_WMI
+	select ACPI_PLATFORM_PROFILE
+	select LENOVO_WMI
+	help
+	  Say Y here if you have a WMI aware Lenovo Legion device and would like to use the
+	  platform-profile firmware interface to manage power usage.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called lenovo-wmi-gamezone.
+
 config IDEAPAD_LAPTOP
 	tristate "Lenovo IdeaPad Laptop Extras"
 	depends on ACPI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 5f6307246e69..4a7b2d14eb82 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -67,7 +67,9 @@ obj-$(CONFIG_THINKPAD_ACPI)	+= thinkpad_acpi.o
 obj-$(CONFIG_THINKPAD_LMI)	+= think-lmi.o
 obj-$(CONFIG_YOGABOOK)		+= lenovo-yogabook.o
 obj-$(CONFIG_YT2_1380)		+= lenovo-yoga-tab2-pro-1380-fastcharger.o
+obj-$(CONFIG_LENOVO_WMI)	+= lenovo-wmi.o
 obj-$(CONFIG_LENOVO_WMI_CAMERA)	+= lenovo-wmi-camera.o
+obj-$(CONFIG_LENOVO_WMI_GAMEZONE)	+= lenovo-wmi-gamezone.o
 
 # Intel
 obj-y				+= intel/
diff --git a/drivers/platform/x86/lenovo-wmi-gamezone.c b/drivers/platform/x86/lenovo-wmi-gamezone.c
new file mode 100644
index 000000000000..d5329fecba47
--- /dev/null
+++ b/drivers/platform/x86/lenovo-wmi-gamezone.c
@@ -0,0 +1,374 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Lenovo GameZone WMI interface driver. The GameZone WMI interface provides
+ * platform profile and fan curve settings for devices that fall under the
+ * "Gaming Series" of Lenovo Legion devices.
+ *
+ * Copyright(C) 2024 Derek J. Clark <derekjohn.clark@gmail.com>
+ */
+
+#include "linux/container_of.h"
+#include "linux/printk.h"
+#include <linux/cleanup.h>
+#include <linux/dev_printk.h>
+#include <linux/dmi.h>
+#include <linux/list.h>
+#include <linux/notifier.h>
+#include <linux/platform_profile.h>
+#include <linux/types.h>
+#include <linux/wmi.h>
+#include "lenovo-wmi.h"
+
+/* Interface GUIDs */
+#define LENOVO_GAMEZONE_GUID "887B54E3-DDDC-4B2C-8B88-68A26A8835D0"
+#define THERMAL_MODE_EVENT_GUID "D320289E-8FEA-41E0-86F9-911D83151B5F"
+
+/* Method IDs */
+#define WMI_METHOD_ID_SMARTFAN_SUPP 43 /* IsSupportSmartFan */
+#define WMI_METHOD_ID_SMARTFAN_SET 44 /* SetSmartFanMode */
+#define WMI_METHOD_ID_SMARTFAN_GET 45 /* GetSmartFanMode */
+
+enum lenovo_wmi_gz_type {
+	GAMEZONE_FULL = 1,
+	THERMAL_MODE,
+};
+
+#define GAMEZONE_WMI_DEVICE(guid, type)                              \
+	.guid_string = (guid), .context = &(enum lenovo_wmi_gz_type) \
+	{                                                            \
+		type                                                 \
+	}
+
+static BLOCKING_NOTIFIER_HEAD(gz_chain_head);
+static DEFINE_MUTEX(gz_chain_mutex);
+
+struct lenovo_wmi_gz_priv {
+	enum platform_profile_option current_profile;
+	struct wmi_device *wdev;
+	bool extreme_supported;
+	struct device *ppdev; /*platform profile device */
+	enum lenovo_wmi_gz_type type;
+	struct blocking_notifier_head nhead;
+};
+
+struct quirk_entry {
+	bool extreme_supported;
+};
+
+static struct quirk_entry quirk_no_extreme_bug = {
+	.extreme_supported = false,
+};
+
+/* Platform Profile Methods & Setup */
+static int
+lenovo_wmi_gz_platform_profile_supported(struct lenovo_wmi_gz_priv *priv,
+					 int *supported)
+{
+	return lenovo_wmidev_evaluate_method_1(priv->wdev, 0x0,
+					       WMI_METHOD_ID_SMARTFAN_SUPP, 0, supported);
+}
+
+static int lenovo_wmi_gz_profile_get(struct device *dev,
+				     enum platform_profile_option *profile)
+{
+	struct lenovo_wmi_gz_priv *priv = dev_get_drvdata(dev);
+	int sel_prof;
+	int ret;
+
+	ret = lenovo_wmidev_evaluate_method_1(priv->wdev, 0x0,
+					      WMI_METHOD_ID_SMARTFAN_GET, 0, &sel_prof);
+	if (ret)
+		return ret;
+
+	switch (sel_prof) {
+	case SMARTFAN_MODE_QUIET:
+		*profile = PLATFORM_PROFILE_LOW_POWER;
+		break;
+	case SMARTFAN_MODE_BALANCED:
+		*profile = PLATFORM_PROFILE_BALANCED;
+		break;
+	case SMARTFAN_MODE_PERFORMANCE:
+		if (priv->extreme_supported) {
+			*profile = PLATFORM_PROFILE_BALANCED_PERFORMANCE;
+			break;
+		}
+		*profile = PLATFORM_PROFILE_PERFORMANCE;
+		break;
+	case SMARTFAN_MODE_EXTREME:
+		*profile = PLATFORM_PROFILE_PERFORMANCE;
+		break;
+	case SMARTFAN_MODE_CUSTOM:
+		*profile = PLATFORM_PROFILE_CUSTOM;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	priv->current_profile = *profile;
+
+	ret = blocking_notifier_call_chain(&gz_chain_head, THERMAL_MODE_EVENT,
+					   &sel_prof);
+	if (ret == NOTIFY_BAD)
+		pr_err("Failed to send notification to call chain for WMI event %u\n",
+		       priv->type);
+	return 0;
+}
+
+static int lenovo_wmi_gz_profile_set(struct device *dev,
+				     enum platform_profile_option profile)
+{
+	struct lenovo_wmi_gz_priv *priv = dev_get_drvdata(dev);
+	int sel_prof;
+	int ret;
+
+	switch (profile) {
+	case PLATFORM_PROFILE_LOW_POWER:
+		sel_prof = SMARTFAN_MODE_QUIET;
+		break;
+	case PLATFORM_PROFILE_BALANCED:
+		sel_prof = SMARTFAN_MODE_BALANCED;
+		break;
+	case PLATFORM_PROFILE_BALANCED_PERFORMANCE:
+		sel_prof = SMARTFAN_MODE_PERFORMANCE;
+		break;
+	case PLATFORM_PROFILE_PERFORMANCE:
+		if (priv->extreme_supported) {
+			sel_prof = SMARTFAN_MODE_EXTREME;
+			break;
+		}
+		sel_prof = SMARTFAN_MODE_PERFORMANCE;
+		break;
+	case PLATFORM_PROFILE_CUSTOM:
+		sel_prof = SMARTFAN_MODE_CUSTOM;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	ret = lenovo_wmidev_evaluate_method_1(priv->wdev, 0x0,
+					      WMI_METHOD_ID_SMARTFAN_SET, sel_prof, NULL);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static const struct dmi_system_id fwbug_list[] = {
+	{
+		.ident = "Legion Go 8APU1",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Legion Go 8APU1"),
+		},
+		.driver_data = &quirk_no_extreme_bug,
+	},
+	{
+		.ident = "Legion Go S 8ARP1",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Legion Go S 8ARP1"),
+		},
+		.driver_data = &quirk_no_extreme_bug,
+	},
+	{
+		.ident = "Legion Go S 8APU1",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Legion Go S 8APU1"),
+		},
+		.driver_data = &quirk_no_extreme_bug,
+	},
+	{},
+
+};
+
+static bool extreme_supported(int profile_support_ver)
+{
+	const struct dmi_system_id *dmi_id;
+	struct quirk_entry *quirks;
+
+	if (profile_support_ver < 6)
+		return false;
+
+	dmi_id = dmi_first_match(fwbug_list);
+	if (!dmi_id)
+		return true;
+
+	quirks = dmi_id->driver_data;
+	return quirks->extreme_supported;
+}
+
+static int lenovo_wmi_platform_profile_probe(void *drvdata,
+					     unsigned long *choices)
+{
+	struct lenovo_wmi_gz_priv *priv = drvdata;
+	enum platform_profile_option profile;
+	int profile_support_ver;
+	int ret;
+
+	ret = lenovo_wmi_gz_platform_profile_supported(priv,
+						       &profile_support_ver);
+	if (ret)
+		return ret;
+
+	if (profile_support_ver < 1)
+		return -ENODEV;
+
+	priv->extreme_supported = extreme_supported(profile_support_ver);
+
+	set_bit(PLATFORM_PROFILE_LOW_POWER, choices);
+	set_bit(PLATFORM_PROFILE_BALANCED, choices);
+	set_bit(PLATFORM_PROFILE_PERFORMANCE, choices);
+	set_bit(PLATFORM_PROFILE_CUSTOM, choices);
+
+	if (priv->extreme_supported)
+		set_bit(PLATFORM_PROFILE_BALANCED_PERFORMANCE, choices);
+
+	return 0;
+}
+
+static const struct platform_profile_ops lenovo_wmi_gz_platform_profile_ops = {
+	.probe = lenovo_wmi_platform_profile_probe,
+	.profile_get = lenovo_wmi_gz_profile_get,
+	.profile_set = lenovo_wmi_gz_profile_set,
+};
+
+/* Notifier Methods */
+int lenovo_wmi_gz_register_notifier(struct notifier_block *nb)
+{
+	guard(mutex)(&gz_chain_mutex);
+	return blocking_notifier_chain_register(&gz_chain_head, nb);
+}
+EXPORT_SYMBOL_NS_GPL(lenovo_wmi_gz_register_notifier, "GZ_WMI");
+
+int lenovo_wmi_gz_unregister_notifier(struct notifier_block *nb)
+{
+	guard(mutex)(&gz_chain_mutex);
+	return blocking_notifier_chain_unregister(&gz_chain_head, nb);
+}
+EXPORT_SYMBOL_NS_GPL(lenovo_wmi_gz_unregister_notifier, "GZ_WMI");
+
+static void devm_lenovo_wmi_gz_unregister_notifier(void *data)
+{
+	struct notifier_block *nb = data;
+
+	lenovo_wmi_gz_unregister_notifier(nb);
+}
+
+int devm_lenovo_wmi_gz_register_notifier(struct device *dev,
+					 struct notifier_block *nb)
+{
+	int ret;
+
+	ret = lenovo_wmi_gz_register_notifier(nb);
+	if (ret < 0)
+		return ret;
+
+	return devm_add_action_or_reset(dev, devm_lenovo_wmi_gz_unregister_notifier, nb);
+}
+EXPORT_SYMBOL_NS_GPL(devm_lenovo_wmi_gz_register_notifier, "GZ_WMI");
+
+/* Driver Methods */
+static void lenovo_wmi_gz_notify(struct wmi_device *wdev,
+				 union acpi_object *obj)
+{
+	struct lenovo_wmi_gz_priv *tm_priv = dev_get_drvdata(&wdev->dev);
+	struct lenovo_wmi_gz_priv *gz_priv =
+		container_of(&gz_chain_head, struct lenovo_wmi_gz_priv, nhead);
+	int sel_prof;
+	int ret;
+
+	if (obj->type != ACPI_TYPE_INTEGER)
+		return;
+
+	switch (tm_priv->type) {
+	case THERMAL_MODE:
+		sel_prof = obj->integer.value;
+		break;
+	default:
+		return;
+	}
+
+	/* Update primary Gamezone instance */
+	switch (sel_prof) {
+	case SMARTFAN_MODE_QUIET:
+		gz_priv->current_profile = PLATFORM_PROFILE_LOW_POWER;
+		break;
+	case SMARTFAN_MODE_BALANCED:
+		gz_priv->current_profile = PLATFORM_PROFILE_BALANCED;
+		break;
+	case SMARTFAN_MODE_PERFORMANCE:
+		if (gz_priv->extreme_supported) {
+			gz_priv->current_profile =
+				PLATFORM_PROFILE_BALANCED_PERFORMANCE;
+			break;
+		}
+		gz_priv->current_profile = PLATFORM_PROFILE_PERFORMANCE;
+		break;
+	case SMARTFAN_MODE_EXTREME:
+		gz_priv->current_profile = PLATFORM_PROFILE_PERFORMANCE;
+		break;
+	case SMARTFAN_MODE_CUSTOM:
+		gz_priv->current_profile = PLATFORM_PROFILE_CUSTOM;
+		break;
+	default:
+		break;
+	}
+
+	ret = blocking_notifier_call_chain(&gz_chain_head, THERMAL_MODE_EVENT,
+					   &sel_prof);
+	if (ret == NOTIFY_BAD)
+		pr_err("Failed to send notification to call chain for WMI event %u\n",
+		       tm_priv->type);
+}
+
+static int lenovo_wmi_gz_probe(struct wmi_device *wdev, const void *context)
+{
+	struct lenovo_wmi_gz_priv *priv =
+		devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
+
+	if (!priv)
+		return -ENOMEM;
+
+	if (!context)
+		return -EINVAL;
+
+	priv->wdev = wdev;
+	priv->type = *((enum lenovo_wmi_gz_type *)context);
+
+	dev_set_drvdata(&wdev->dev, priv);
+
+	if (priv->type != GAMEZONE_FULL)
+		return 0;
+
+	priv->nhead = gz_chain_head;
+	priv->ppdev = platform_profile_register(&wdev->dev, "lenovo-wmi-gamezone",
+						priv, &lenovo_wmi_gz_platform_profile_ops);
+
+	return 0;
+}
+
+static const struct wmi_device_id lenovo_wmi_gz_id_table[] = {
+	{ GAMEZONE_WMI_DEVICE(LENOVO_GAMEZONE_GUID, GAMEZONE_FULL) },
+	{ GAMEZONE_WMI_DEVICE(THERMAL_MODE_EVENT_GUID, THERMAL_MODE) },
+	{}
+};
+
+static struct wmi_driver lenovo_wmi_gz_driver = {
+	.driver = {
+		.name = "lenovo_wmi_gamezone",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+	},
+	.id_table = lenovo_wmi_gz_id_table,
+	.probe = lenovo_wmi_gz_probe,
+	.notify = lenovo_wmi_gz_notify,
+	.no_singleton = true,
+};
+
+module_wmi_driver(lenovo_wmi_gz_driver);
+
+MODULE_IMPORT_NS("LENOVO_WMI");
+MODULE_DEVICE_TABLE(wmi, lenovo_wmi_gz_id_table);
+MODULE_AUTHOR("Derek J. Clark <derekjohn.clark@gmail.com>");
+MODULE_DESCRIPTION("Lenovo GameZone WMI Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/platform/x86/lenovo-wmi.c b/drivers/platform/x86/lenovo-wmi.c
new file mode 100644
index 000000000000..0de2c37e69bd
--- /dev/null
+++ b/drivers/platform/x86/lenovo-wmi.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Lenovo Legion WMI interface driver. The Lenovo Legion WMI interface is
+ * broken up into multiple GUID interfaces that require cross-references
+ * between GUID's for some functionality. The "Custom Method" interface is a
+ * legacy interface for managing and displaying CPU & GPU power and hwmon
+ * settings and readings. The "Other Mode" interface is a modern interface
+ * that replaces or extends the "Custom Method" interface methods. The
+ * "Gamezone" interface adds advanced features such as fan profiles and
+ * overclocking. The "Lighting" interface adds control of various status
+ * lights related to different hardware components. "Other Mode" uses
+ * the data structs LENOVO_CAPABILITY_DATA_00, LENOVO_CAPABILITY_DATA_01
+ * and LENOVO_CAPABILITY_DATA_02 structs for capability information.
+ *
+ * Copyright(C) 2024 Derek J. Clark <derekjohn.clark@gmail.com>
+ *
+ */
+
+#include <linux/wmi.h>
+#include "lenovo-wmi.h"
+
+/* wmidev_evaluate_method helper functions */
+static int lenovo_wmidev_evaluate_method(struct wmi_device *wdev, u8 instance,
+					 u32 method_id, struct acpi_buffer *in,
+					 struct acpi_buffer *out)
+{
+	acpi_status status;
+
+	status = wmidev_evaluate_method(wdev, instance, method_id, in, out);
+
+	if (ACPI_FAILURE(status))
+		return -EIO;
+
+	return 0;
+};
+
+int lenovo_wmidev_evaluate_method_2(struct wmi_device *wdev, u8 instance,
+				    u32 method_id, u32 arg0, u32 arg1,
+				    u32 *retval)
+{
+	struct wmi_method_args args = { arg0, arg1 };
+	struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *ret_obj __free(kfree) = NULL;
+	int err;
+
+	err = lenovo_wmidev_evaluate_method(wdev, instance, method_id, &input,
+					    &output);
+
+	if (err)
+		return err;
+
+	if (retval) {
+		ret_obj = (union acpi_object *)output.pointer;
+		if (!ret_obj)
+			return -ENODATA;
+
+		if (ret_obj->type != ACPI_TYPE_INTEGER)
+			return -ENXIO;
+
+		*retval = (u32)ret_obj->integer.value;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(lenovo_wmidev_evaluate_method_2, "LENOVO_WMI");
+
+int lenovo_wmidev_evaluate_method_1(struct wmi_device *wdev, u8 instance,
+				    u32 method_id, u32 arg0, u32 *retval)
+{
+	return lenovo_wmidev_evaluate_method_2(wdev, instance, method_id, arg0,
+					       0, retval);
+}
+EXPORT_SYMBOL_NS_GPL(lenovo_wmidev_evaluate_method_1, "LENOVO_WMI");
+MODULE_AUTHOR("Derek J. Clark <derekjohn.clark@gmail.com>");
+MODULE_DESCRIPTION("Lenovo WMI Common Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/platform/x86/lenovo-wmi.h b/drivers/platform/x86/lenovo-wmi.h
new file mode 100644
index 000000000000..113928b4fc0f
--- /dev/null
+++ b/drivers/platform/x86/lenovo-wmi.h
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * Lenovo Legion WMI interface driver. The Lenovo Legion WMI interface is
+ * broken up into multiple GUID interfaces that require cross-references
+ * between GUID's for some functionality. The "Custom Method" interface is a
+ * legacy interface for managing and displaying CPU & GPU power and hwmon
+ * settings and readings. The "Other Mode" interface is a modern interface
+ * that replaces or extends the "Custom Method" interface methods. The
+ * "Gamezone" interface adds advanced features such as fan profiles and
+ * overclocking. The "Lighting" interface adds control of various status
+ * lights related to different hardware components. "Other Mode" uses
+ * the data structs LENOVO_CAPABILITY_DATA_00, LENOVO_CAPABILITY_DATA_01
+ * and LENOVO_CAPABILITY_DATA_02 structs for capability information.
+ *
+ * Copyright(C) 2024 Derek J. Clark <derekjohn.clark@gmail.com>
+ *
+ */
+#include <linux/notifier.h>
+#include <linux/platform_profile.h>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#ifndef _LENOVO_WMI_H_
+#define _LENOVO_WMI_H_
+
+#include <linux/bits.h>
+#include <linux/types.h>
+#include <linux/wmi.h>
+
+struct wmi_method_args {
+	u32 arg0;
+	u32 arg1;
+};
+
+/* gamezone structs */
+enum thermal_mode {
+	SMARTFAN_MODE_QUIET = 0x01,
+	SMARTFAN_MODE_BALANCED = 0x02,
+	SMARTFAN_MODE_PERFORMANCE = 0x03,
+	SMARTFAN_MODE_EXTREME = 0xE0, /* Ver 6+ */
+	SMARTFAN_MODE_CUSTOM = 0xFF,
+};
+
+enum lenovo_wmi_action {
+	THERMAL_MODE_EVENT = 1,
+};
+
+/* wmidev_evaluate_method helper functions */
+int lenovo_wmidev_evaluate_method_2(struct wmi_device *wdev, u8 instance,
+				    u32 method_id, u32 arg0, u32 arg1,
+				    u32 *retval);
+int lenovo_wmidev_evaluate_method_1(struct wmi_device *wdev, u8 instance,
+				    u32 method_id, u32 arg0, u32 *retval);
+
+/* lenovo_wmi_gz_driver notifier functions */
+int lenovo_wmi_gz_notifier_call(struct notifier_block *nb, unsigned long action,
+				enum platform_profile_option *profile);
+int lenovo_wmi_gz_register_notifier(struct notifier_block *nb);
+int lenovo_wmi_gz_unregister_notifier(struct notifier_block *nb);
+int devm_lenovo_wmi_gz_register_notifier(struct device *dev,
+					 struct notifier_block *nb);
+#endif /* !_LENOVO_WMI_H_ */
-- 
2.48.1