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Message-ID: <fc7d510c-4b41-4b78-b1e2-24710e208275@gmx.de>
Date: Thu, 17 Apr 2025 00:54:49 +0200
From: Armin Wolf <W_Armin@....de>
To: "Derek J. Clark" <derekjohn.clark@...il.com>,
Hans de Goede <hdegoede@...hat.com>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Jonathan Corbet <corbet@....net>, Mario Limonciello <superm1@...nel.org>,
Luke Jones <luke@...nes.dev>, Xino Ni <nijs1@...ovo.com>,
Zhixin Zhang <zhangzx36@...ovo.com>, Mia Shao <shaohz1@...ovo.com>,
Mark Pearson <mpearson-lenovo@...ebb.ca>,
"Pierre-Loup A . Griffais" <pgriffais@...vesoftware.com>,
"Cody T . -H . Chiu" <codyit@...il.com>, John Martens <johnfanv2@...il.com>,
platform-driver-x86@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 6/6] platform/x86: Add Lenovo Other Mode WMI Driver
Am 08.04.25 um 03:28 schrieb Derek J. Clark:
> Adds lenovo-wmi-other driver which provides the Lenovo "Other Mode" WMI
> interface that comes on some Lenovo "Gaming Series" hardware. Provides a
> firmware-attributes class which enables the use of tunable knobs for SPL,
> SPPT, and FPPT.
>
> Signed-off-by: Derek J. Clark <derekjohn.clark@...il.com>
> ---
> v5:
> - Switch from locally storing capability data list to storing a pointer
> from the capability data interface.
> - Add portion of Gamezone driver that relies on the exported functions
> of this driver.
> - Properly initialize IDA and use it for naming the firmware-attributes
> path.
> - Rename most defines to clearly indicate they are from this driver.
> - Misc fixes from v4 review.
> v4:
> - Treat Other Mode as a notifier chain head, use the notifier chain to
> get the current mode from Gamezone.
> - Add header file for Other Mode specific structs and finctions.
> - Use component master bind to cache the capdata01 array locally.
> - Drop all reference to external driver private data structs.
> - Various fixes from review.
> v3:
> - Add notifier block and store result for getting the Gamezone interface
> profile changes.
> - Add driver as master component of capdata01 driver.
> - Use FIELD_PREP where appropriate.
> - Move macros and associated functions out of lemovo-wmi.h that are only
> used by this driver.
> 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 other_method_wmi to lenovo_wmi_om_priv and om_wmi to priv.
> - Use list to get the lenovo_wmi_om_priv instance in some macro
> called functions as the data provided by the macros that use it
> doesn't pass a member of the struct for use in container_of.
> - Do not rely on GameZone interface to grab the current fan mode.
> ---
> MAINTAINERS | 2 +
> drivers/platform/x86/Kconfig | 15 +
> drivers/platform/x86/Makefile | 1 +
> drivers/platform/x86/lenovo-wmi-gamezone.c | 35 ++
> drivers/platform/x86/lenovo-wmi-other.c | 677 +++++++++++++++++++++
> drivers/platform/x86/lenovo-wmi-other.h | 16 +
> 6 files changed, 746 insertions(+)
> create mode 100644 drivers/platform/x86/lenovo-wmi-other.c
> create mode 100644 drivers/platform/x86/lenovo-wmi-other.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 49deb8ea4ea7..0416afd997a0 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -13172,6 +13172,8 @@ F: drivers/platform/x86/lenovo-wmi-gamezone.c
> F: drivers/platform/x86/lenovo-wmi-gamezone.h
> F: drivers/platform/x86/lenovo-wmi-helpers.c
> F: drivers/platform/x86/lenovo-wmi-helpers.h
> +F: drivers/platform/x86/lenovo-wmi-other.c
> +F: drivers/platform/x86/lenovo-wmi-other.h
>
> LENOVO WMI HOTKEY UTILITIES DRIVER
> M: Jackie Dong <xy-jackie@....com>
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index aaa1a69c10ca..be5ab24960b5 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -485,6 +485,21 @@ config LENOVO_WMI_DATA01
> tristate
> depends on ACPI_WMI
>
> +config LENOVO_WMI_TUNING
> + tristate "Lenovo Other Mode WMI Driver"
> + depends on ACPI_WMI
> + select FW_ATTR_CLASS
> + select LENOVO_WMI_DATA01
> + select LENOVO_WMI_EVENTS
> + select LENOVO_WMI_HELPERS
> + help
> + Say Y here if you have a WMI aware Lenovo Legion device and would like to use the
> + firmware_attributes API to control various tunable settings typically exposed by
> + Lenovo software in Windows.
> +
> + To compile this driver as a module, choose M here: the module will
> + be called lenovo-wmi-other.
> +
> config IDEAPAD_LAPTOP
> tristate "Lenovo IdeaPad Laptop Extras"
> depends on ACPI
> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
> index 60058b547de2..f3e64926a96b 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -73,6 +73,7 @@ obj-$(CONFIG_LENOVO_WMI_DATA01) += lenovo-wmi-capdata01.o
> obj-$(CONFIG_LENOVO_WMI_EVENTS) += lenovo-wmi-events.o
> obj-$(CONFIG_LENOVO_WMI_GAMEZONE) += lenovo-wmi-gamezone.o
> obj-$(CONFIG_LENOVO_WMI_HELPERS) += lenovo-wmi-helpers.o
> +obj-$(CONFIG_LENOVO_WMI_TUNING) += lenovo-wmi-other.o
>
> # Intel
> obj-y += intel/
> diff --git a/drivers/platform/x86/lenovo-wmi-gamezone.c b/drivers/platform/x86/lenovo-wmi-gamezone.c
> index 2e6d5e7faadf..9c80561f931c 100644
> --- a/drivers/platform/x86/lenovo-wmi-gamezone.c
> +++ b/drivers/platform/x86/lenovo-wmi-gamezone.c
> @@ -22,6 +22,7 @@
> #include "lenovo-wmi-events.h"
> #include "lenovo-wmi-gamezone.h"
> #include "lenovo-wmi-helpers.h"
> +#include "lenovo-wmi-other.h"
>
> #define LENOVO_GAMEZONE_GUID "887B54E3-DDDC-4B2C-8B88-68A26A8835D0"
>
> @@ -49,6 +50,34 @@ static struct quirk_entry quirk_no_extreme_bug = {
> .extreme_supported = false,
> };
>
> +/**
> + * lwmi_gz_mode_call() - Call method for lenovo-wmi-other driver notifier.
> + *
> + * @nb: The notifier_block registered to lenovo-wmi-other driver.
> + * @cmd: The event type.
> + * @data: Thermal mode enum pointer pointer for returning the thermal mode.
> + *
> + * For LWMI_GZ_GET_THERMAL_MODE, retrieve the current thermal mode.
> + *
> + * Return: Notifier_block status.
> + */
> +static int lwmi_gz_mode_call(struct notifier_block *nb, unsigned long cmd,
> + void *data)
> +{
> + enum thermal_mode **mode = data;
> + struct lwmi_gz_priv *priv;
> +
> + priv = container_of(nb, struct lwmi_gz_priv, mode_nb);
> +
> + switch (cmd) {
> + case LWMI_GZ_GET_THERMAL_MODE:
> + **mode = priv->current_mode;
Please use the spinlock here you introduced previously.
> + return NOTIFY_STOP;
> + default:
> + return NOTIFY_DONE;
> + }
> +}
> +
> /**
> * lwmi_gz_event_call() - Call method for lenovo-wmi-events driver notifier.
> * block call chain.
> @@ -347,6 +376,11 @@ static int lwmi_gz_probe(struct wmi_device *wdev, const void *context)
> if (ret)
> return ret;
>
> + priv->mode_nb.notifier_call = lwmi_gz_mode_call;
> + ret = devm_lwmi_om_register_notifier(&wdev->dev, &priv->mode_nb);
> + if (ret)
> + return ret;
Please directly return the result of devm_lwmi_om_register_notifier() here.
> +
> return 0;
> }
>
> @@ -369,6 +403,7 @@ module_wmi_driver(lwmi_gz_driver);
>
> MODULE_IMPORT_NS("LENOVO_WMI_EVENTS");
> MODULE_IMPORT_NS("LENOVO_WMI_HELPERS");
> +MODULE_IMPORT_NS("LENOVO_WMI_OTHER");
> MODULE_DEVICE_TABLE(wmi, lwmi_gz_id_table);
> MODULE_AUTHOR("Derek J. Clark <derekjohn.clark@...il.com>");
> MODULE_DESCRIPTION("Lenovo GameZone WMI Driver");
> diff --git a/drivers/platform/x86/lenovo-wmi-other.c b/drivers/platform/x86/lenovo-wmi-other.c
> new file mode 100644
> index 000000000000..342883a90270
> --- /dev/null
> +++ b/drivers/platform/x86/lenovo-wmi-other.c
> @@ -0,0 +1,677 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Lenovo Other Mode WMI interface driver.
> + *
> + * This driver uses the fw_attributes class to expose the various WMI functions
> + * provided by the "Other Mode" WMI interface. This enables CPU and GPU power
> + * limit as well as various other attributes for devices that fall under the
> + * "Gaming Series" of Lenovo laptop devices. Each attribute exposed by the
> + * "Other Mode"" interface has a corresponding Capability Data struct that
> + * allows the driver to probe details about the attribute such as if it is
> + * supported by the hardware, the default_value, max_value, min_value, and step
> + * increment.
> + *
> + * These attributes typically don't fit anywhere else in the sysfs and are set
> + * in Windows using one of Lenovo's multiple user applications.
> + *
> + * Copyright(C) 2025 Derek J. Clark <derekjohn.clark@...il.com>
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/bitfield.h>
> +#include <linux/cleanup.h>
> +#include <linux/component.h>
> +#include <linux/container_of.h>
> +#include <linux/device.h>
> +#include <linux/export.h>
> +#include <linux/gfp_types.h>
> +#include <linux/idr.h>
> +#include <linux/kobject.h>
> +#include <linux/module.h>
> +#include <linux/notifier.h>
> +#include <linux/platform_profile.h>
> +#include <linux/types.h>
> +#include <linux/wmi.h>
> +
> +#include "lenovo-wmi-capdata01.h"
> +#include "lenovo-wmi-events.h"
> +#include "lenovo-wmi-gamezone.h"
> +#include "lenovo-wmi-helpers.h"
> +#include "lenovo-wmi-other.h"
> +#include "firmware_attributes_class.h"
> +
> +#define LENOVO_OTHER_MODE_GUID "DC2A8805-3A8C-41BA-A6F7-092E0089CD3B"
> +
> +#define LWMI_DEVICE_ID_CPU 0x01
> +
> +#define LWMI_FEATURE_ID_CPU_SPPT 0x01
> +#define LWMI_FEATURE_ID_CPU_SPL 0x02
> +#define LWMI_FEATURE_ID_CPU_FPPT 0x03
> +
> +#define LWMI_TYPE_ID_NONE 0x00
> +
> +#define LWMI_FEATURE_VALUE_GET 17
> +#define LWMI_FEATURE_VALUE_SET 18
> +
> +#define LWMI_ATTR_DEV_ID_MASK GENMASK(31, 24)
> +#define LWMI_ATTR_FEAT_ID_MASK GENMASK(23, 16)
> +#define LWMI_ATTR_MODE_ID_MASK GENMASK(15, 8)
> +#define LWMI_ATTR_TYPE_ID_MASK GENMASK(7, 0)
> +
> +#define LWMI_OM_FW_ATTR_BASE_PATH "lenovo-wmi-other"
> +
> +static BLOCKING_NOTIFIER_HEAD(om_chain_head);
> +static DEFINE_IDA(lwmi_om_ida);
> +
> +enum attribute_property {
> + DEFAULT_VAL,
> + MAX_VAL,
> + MIN_VAL,
> + STEP_VAL,
> + SUPPORTED,
> +};
> +
> +struct lwmi_om_priv {
> + struct component_master_ops *ops;
> + /* *cd01_list is only valid after master bind and while capdata01 exists */
> + struct cd01_list *cd01_list;
> + struct device *fw_attr_dev;
> + struct kset *fw_attr_kset;
> + struct notifier_block nb;
> + struct wmi_device *wdev;
> + int ida_id;
> +};
> +
> +struct tunable_attr_01 {
> + struct capdata01 *capdata;
> + struct device *dev;
> + u32 feature_id;
> + u32 device_id;
> + u32 type_id;
> +};
> +
> +struct tunable_attr_01 ppt_pl1_spl = { .device_id = LWMI_DEVICE_ID_CPU,
> + .feature_id = LWMI_FEATURE_ID_CPU_SPL,
> + .type_id = LWMI_TYPE_ID_NONE };
> +struct tunable_attr_01 ppt_pl2_sppt = { .device_id = LWMI_DEVICE_ID_CPU,
> + .feature_id = LWMI_FEATURE_ID_CPU_SPPT,
> + .type_id = LWMI_TYPE_ID_NONE };
> +struct tunable_attr_01 ppt_pl3_fppt = { .device_id = LWMI_DEVICE_ID_CPU,
> + .feature_id = LWMI_FEATURE_ID_CPU_FPPT,
> + .type_id = LWMI_TYPE_ID_NONE };
> +
> +struct capdata01_attr_group {
> + const struct attribute_group *attr_group;
> + struct tunable_attr_01 *tunable_attr;
> +};
> +
> +/**
> + * lwmi_om_register_notifier() - Add a notifier to the blocking notifier chain
> + * @nb: The notifier_block struct to register
> + *
> + * Call blocking_notifier_chain_register to register the notifier block to the
> + * lenovo-wmi-other driver notifer chain.
> + *
> + * Return: 0 on success, %-EEXIST on error.
> + */
> +int lwmi_om_register_notifier(struct notifier_block *nb)
> +{
> + return blocking_notifier_chain_register(&om_chain_head, nb);
> +}
> +EXPORT_SYMBOL_NS_GPL(lwmi_om_register_notifier, "LENOVO_WMI_OTHER");
> +
> +/**
> + * lwmi_om_unregister_notifier() - Remove a notifier from the blocking notifier
> + * chain.
> + * @nb: The notifier_block struct to register
> + *
> + * Call blocking_notifier_chain_unregister to unregister the notifier block from the
> + * lenovo-wmi-other driver notifer chain.
> + *
> + * Return: 0 on success, %-ENOENT on error.
> + */
> +int lwmi_om_unregister_notifier(struct notifier_block *nb)
> +{
> + return blocking_notifier_chain_unregister(&om_chain_head, nb);
> +}
> +EXPORT_SYMBOL_NS_GPL(lwmi_om_unregister_notifier, "LENOVO_WMI_OTHER");
> +
> +/**
> + * devm_lwmi_om_unregister_notifier() - Remove a notifier from the blocking
> + * notifier chain.
> + * @data: Void pointer to the notifier_block struct to register.
> + *
> + * Call lwmi_om_unregister_notifier to unregister the notifier block from the
> + * lenovo-wmi-other driver notifer chain.
> + *
> + * Return: 0 on success, %-ENOENT on error.
> + */
> +static void devm_lwmi_om_unregister_notifier(void *data)
> +{
> + struct notifier_block *nb = data;
> +
> + lwmi_om_unregister_notifier(nb);
> +}
> +
> +/**
> + * devm_lwmi_om_register_notifier() - Add a notifier to the blocking notifier
> + * chain.
> + * @dev: The parent device of the notifier_block struct.
> + * @nb: The notifier_block struct to register
> + *
> + * Call lwmi_om_register_notifier to register the notifier block to the
> + * lenovo-wmi-other driver notifer chain. Then add devm_lwmi_om_unregister_notifier
> + * as a device managed ation to automatically unregister the notifier block
> + * upon parent device removal.
> + *
> + * Return: 0 on success, or on error.
> + */
> +int devm_lwmi_om_register_notifier(struct device *dev,
> + struct notifier_block *nb)
> +{
> + int ret;
> +
> + ret = lwmi_om_register_notifier(nb);
> + if (ret < 0)
> + return ret;
> +
> + return devm_add_action_or_reset(dev, devm_lwmi_om_unregister_notifier,
> + nb);
> +}
> +EXPORT_SYMBOL_NS_GPL(devm_lwmi_om_register_notifier, "LENOVO_WMI_OTHER");
> +
> +/**
> + * lwmi_om_notifier_call() - Call functions for the notifier call chain.
> + * @mode: Pointer to a thermal mode enum to retrieve the data from.
> + *
> + * Call blocking_notifier_call_chain to retrieve the thermal mode from the
> + * lenovo-wmi-gamezone driver.
> + *
> + * Return: 0 on success, or on error.
> + */
> +static int lwmi_om_notifier_call(enum thermal_mode *mode)
> +{
> + int ret;
> +
> + ret = blocking_notifier_call_chain(&om_chain_head, LWMI_GZ_GET_THERMAL_MODE, &mode);
> + if ((ret & ~NOTIFY_STOP_MASK) != NOTIFY_OK)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +/* Attribute Methods */
> +
> +/**
> + * int_type_show() - Emit the data type for an integer attribute
> + * @kobj: Pointer to the driver object.
> + * @kobj_attribute: Pointer to the attribute calling this function.
> + * @buf: The buffer to write to.
> + *
> + * Return: Number of characters written to buf.
> + */
> +static ssize_t int_type_show(struct kobject *kobj, struct kobj_attribute *kattr,
> + char *buf)
> +{
> + return sysfs_emit(buf, "integer\n");
> +}
> +
> +/**
> + * attr_capdata01_get - Get the data of the specified attribute
> + * @tunable_attr: The attribute to be populated.
> + *
> + * Retrieves the capability data 01 struct pointer for the given
> + * attribute for its specified thermal mode.
> + *
> + * Return: Either a pointer to capability data, or NULL.
> + */
> +static struct capdata01 *attr_capdata01_get_data(struct lwmi_om_priv *priv,
> + u32 attribute_id)
> +{
> + int idx;
> +
> + for (idx = 0; idx < priv->cd01_list->count; idx++) {
> + if (priv->cd01_list->data[idx].id != attribute_id)
> + continue;
> + return &priv->cd01_list->data[idx];
> + }
> + return NULL;
> +}
> +
> +/**
> + * attr_capdata01_show() - Get the value of the specified attribute property
> + *
> + * @kobj: Pointer to the driver object.
> + * @kobj_attribute: Pointer to the attribute calling this function.
> + * @buf: The buffer to write to.
> + * @tunable_attr: The attribute to be read.
> + * @prop: The property of this attribute to be read.
> + *
> + * Retrieves the given property from the capability data 01 struct for the
> + * specified attribute's "custom" thermal mode. This function is intended
> + * to be generic so it can be called from any integer attributes "_show"
> + * function.
> + *
> + * If the WMI is success the sysfs attribute is notified.
> + *
> + * Return: Either number of characters written to buf, or an error.
> + */
> +static ssize_t attr_capdata01_show(struct kobject *kobj,
> + struct kobj_attribute *kattr, char *buf,
> + struct tunable_attr_01 *tunable_attr,
> + enum attribute_property prop)
> +{
> + struct lwmi_om_priv *priv = dev_get_drvdata(tunable_attr->dev);
> + struct capdata01 *capdata;
> + u32 attribute_id;
> + int value;
> +
> + attribute_id =
> + FIELD_PREP(LWMI_ATTR_DEV_ID_MASK, tunable_attr->device_id) |
> + FIELD_PREP(LWMI_ATTR_FEAT_ID_MASK, tunable_attr->feature_id) |
> + FIELD_PREP(LWMI_ATTR_MODE_ID_MASK, LWMI_GZ_THERMAL_MODE_CUSTOM) |
> + FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, tunable_attr->type_id);
> +
> + capdata = attr_capdata01_get_data(priv, attribute_id);
> +
> + if (!capdata)
> + return -ENODEV;
> +
> + switch (prop) {
> + case DEFAULT_VAL:
> + value = capdata->default_value;
> + break;
> + case MAX_VAL:
> + value = capdata->max_value;
> + break;
> + case MIN_VAL:
> + value = capdata->min_value;
> + break;
> + case STEP_VAL:
> + value = capdata->step;
> + break;
> + default:
> + return -EINVAL;
> + }
> + return sysfs_emit(buf, "%d\n", value);
> +}
> +
> +/**
> + * att_current_value_store() - Set the current value of the given attribute
> + * @kobj: Pointer to the driver object.
> + * @kobj_attribute: Pointer to the attribute calling this function.
> + * @buf: The buffer to read from, this is parsed to `int` type.
> + * @count: Required by sysfs attribute macros, pass in from the callee attr.
> + * @tunable_attr: The attribute to be stored.
> + *
> + * Sets the value of the given attribute when operating under the "custom"
> + * smartfan profile. The current smartfan profile is retrieved from the
> + * lenovo-wmi-gamezone driver and error is returned if the result is not
> + * "custom". This function is intended to be generic so it can be called from
> + * any integer attribute's "_store" function. The integer to be sent to the WMI
> + * method is range checked and an error is returned if out of range.
> + *
> + * If the value is valid and WMI is success, then the sysfs attribute is
> + * notified.
> + *
> + * Return: Either count, or an error.
> + */
> +static ssize_t attr_current_value_store(struct kobject *kobj,
> + struct kobj_attribute *kattr,
> + const char *buf, size_t count,
> + struct tunable_attr_01 *tunable_attr)
> +{
> + struct lwmi_om_priv *priv = dev_get_drvdata(tunable_attr->dev);
> + struct wmi_method_args_32 args;
> + struct capdata01 *capdata;
> + enum thermal_mode mode;
> + u32 attribute_id;
> + u32 value;
> + int err;
> +
> + err = lwmi_om_notifier_call(&mode);
> + if (err)
> + return err;
> +
> + if (mode != LWMI_GZ_THERMAL_MODE_CUSTOM)
> + return -EBUSY;
> +
> + attribute_id =
> + FIELD_PREP(LWMI_ATTR_DEV_ID_MASK, tunable_attr->device_id) |
> + FIELD_PREP(LWMI_ATTR_FEAT_ID_MASK, tunable_attr->feature_id) |
> + FIELD_PREP(LWMI_ATTR_MODE_ID_MASK, mode) |
> + FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, tunable_attr->type_id);
> +
> + capdata = attr_capdata01_get_data(priv, attribute_id);
> +
> + if (!capdata)
> + return -ENODEV;
> +
> + err = kstrtouint(buf, 10, &value);
> + if (err)
> + return err;
> +
> + if (value < capdata->min_value || value > capdata->max_value)
> + return -EINVAL;
> +
> + args.arg0 = attribute_id;
> + args.arg1 = value;
> +
> + err = lwmi_dev_evaluate_int(priv->wdev, 0x0, LWMI_FEATURE_VALUE_SET,
> + (unsigned char *)&args, sizeof(args), NULL);
> +
> + if (err)
> + return err;
> +
> + return count;
> +};
> +
> +/**
> + * attr_current_value_show() - Get the current value of the given attribute
> + * @kobj: Pointer to the driver object.
> + * @kobj_attribute: Pointer to the attribute calling this function.
> + * @buf: The buffer to write to.
> + * @tunable_attr: The attribute to be read.
> + *
> + * Retrieves the value of the given attribute for the current smartfan profile.
> + * The current smartfan profile is retrieved from the lenovo-wmi-gamezone driver.
> + * This function is intended to be generic so it can be called from any integer
> + * attribute's "_show" function.
> + *
> + * If the WMI is success the sysfs attribute is notified.
> + *
> + * Return: Either number of characters written to buf, or an error.
> + */
> +static ssize_t attr_current_value_show(struct kobject *kobj,
> + struct kobj_attribute *kattr, char *buf,
> + struct tunable_attr_01 *tunable_attr)
> +{
> + struct lwmi_om_priv *priv = dev_get_drvdata(tunable_attr->dev);
> + struct wmi_method_args_32 args;
> + enum thermal_mode mode;
> + u32 attribute_id;
> + int retval;
> + int err;
> +
> + err = lwmi_om_notifier_call(&mode);
> + if (err)
> + return err;
> +
> + attribute_id =
> + FIELD_PREP(LWMI_ATTR_DEV_ID_MASK, tunable_attr->device_id) |
> + FIELD_PREP(LWMI_ATTR_FEAT_ID_MASK, tunable_attr->feature_id) |
> + FIELD_PREP(LWMI_ATTR_MODE_ID_MASK, mode) |
> + FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, tunable_attr->type_id);
> +
> + args.arg0 = attribute_id;
> +
> + err = lwmi_dev_evaluate_int(priv->wdev, 0x0, LWMI_FEATURE_VALUE_GET,
> + (unsigned char *)&args, sizeof(args),
> + &retval);
> +
> + if (err)
> + return err;
> +
> + return sysfs_emit(buf, "%d\n", retval);
> +}
> +
> +/* Lenovo WMI Other Mode Attribute macros */
> +#define __LWMI_ATTR_RO(_func, _name) \
> + { \
> + .attr = { .name = __stringify(_name), .mode = 0444 }, \
> + .show = _func##_##_name##_show, \
> + }
> +
> +#define __LWMI_ATTR_RO_AS(_name, _show) \
> + { \
> + .attr = { .name = __stringify(_name), .mode = 0444 }, \
> + .show = _show, \
> + }
> +
> +#define __LWMI_ATTR_RW(_func, _name) \
> + __ATTR(_name, 0644, _func##_##_name##_show, _func##_##_name##_store)
> +
> +/* Shows a formatted static variable */
> +#define __LWMI_ATTR_SHOW_FMT(_prop, _attrname, _fmt, _val) \
> + static ssize_t _attrname##_##_prop##_show( \
> + struct kobject *kobj, struct kobj_attribute *kattr, char *buf) \
> + { \
> + return sysfs_emit(buf, _fmt, _val); \
> + } \
> + static struct kobj_attribute attr_##_attrname##_##_prop = \
> + __LWMI_ATTR_RO(_attrname, _prop)
> +
> +/* Attribute current value read/write */
> +#define __LWMI_TUNABLE_CURRENT_VALUE_CAP01(_attrname) \
> + static ssize_t _attrname##_current_value_store( \
> + struct kobject *kobj, struct kobj_attribute *kattr, \
> + const char *buf, size_t count) \
> + { \
> + return attr_current_value_store(kobj, kattr, buf, count, \
> + &_attrname); \
> + } \
> + static ssize_t _attrname##_current_value_show( \
> + struct kobject *kobj, struct kobj_attribute *kattr, char *buf) \
> + { \
> + return attr_current_value_show(kobj, kattr, buf, &_attrname); \
> + } \
> + static struct kobj_attribute attr_##_attrname##_current_value = \
> + __LWMI_ATTR_RW(_attrname, current_value)
> +
> +/* Attribute property read only */
> +#define __LWMI_TUNABLE_RO_CAP01(_prop, _attrname, _prop_type) \
> + static ssize_t _attrname##_##_prop##_show( \
> + struct kobject *kobj, struct kobj_attribute *kattr, char *buf) \
> + { \
> + return attr_capdata01_show(kobj, kattr, buf, &_attrname, \
> + _prop_type); \
> + } \
> + static struct kobj_attribute attr_##_attrname##_##_prop = \
> + __LWMI_ATTR_RO(_attrname, _prop)
> +
> +#define LWMI_ATTR_GROUP_TUNABLE_CAP01(_attrname, _fsname, _dispname) \
> + __LWMI_TUNABLE_CURRENT_VALUE_CAP01(_attrname); \
> + __LWMI_TUNABLE_RO_CAP01(default_value, _attrname, DEFAULT_VAL); \
> + __LWMI_ATTR_SHOW_FMT(display_name, _attrname, "%s\n", _dispname); \
> + __LWMI_TUNABLE_RO_CAP01(max_value, _attrname, MAX_VAL); \
> + __LWMI_TUNABLE_RO_CAP01(min_value, _attrname, MIN_VAL); \
> + __LWMI_TUNABLE_RO_CAP01(scalar_increment, _attrname, STEP_VAL); \
> + static struct kobj_attribute attr_##_attrname##_type = \
> + __LWMI_ATTR_RO_AS(type, int_type_show); \
> + static struct attribute *_attrname##_attrs[] = { \
> + &attr_##_attrname##_current_value.attr, \
> + &attr_##_attrname##_default_value.attr, \
> + &attr_##_attrname##_display_name.attr, \
> + &attr_##_attrname##_max_value.attr, \
> + &attr_##_attrname##_min_value.attr, \
> + &attr_##_attrname##_scalar_increment.attr, \
> + &attr_##_attrname##_type.attr, \
> + NULL, \
> + }; \
> + static const struct attribute_group _attrname##_attr_group = { \
> + .name = _fsname, .attrs = _attrname##_attrs \
> + }
> +
> +LWMI_ATTR_GROUP_TUNABLE_CAP01(ppt_pl1_spl, "ppt_pl1_spl",
> + "Set the CPU sustained power limit");
> +LWMI_ATTR_GROUP_TUNABLE_CAP01(ppt_pl2_sppt, "ppt_pl2_sppt",
> + "Set the CPU slow package power tracking limit");
> +LWMI_ATTR_GROUP_TUNABLE_CAP01(ppt_pl3_fppt, "ppt_pl3_fppt",
> + "Set the CPU fast package power tracking limit");
> +
> +static struct capdata01_attr_group cd01_attr_groups[] = {
> + { &ppt_pl1_spl_attr_group, &ppt_pl1_spl },
> + { &ppt_pl2_sppt_attr_group, &ppt_pl2_sppt },
> + { &ppt_pl3_fppt_attr_group, &ppt_pl3_fppt },
> + {},
> +};
> +
> +/**
> + * lwmi_om_fw_attr_add() - Register all firmware_attributes_class members
> + * @priv: The Other Mode driver data.
> + *
> + * Return: Either 0, or an error.
> + */
> +static int lwmi_om_fw_attr_add(struct lwmi_om_priv *priv)
> +{
> + unsigned int i;
> + int err;
> +
> + priv->ida_id = ida_alloc(&lwmi_om_ida, GFP_KERNEL);
> + if (priv->ida_id < 0)
> + return priv->ida_id;
> +
> + priv->fw_attr_dev = device_create(&firmware_attributes_class, NULL,
> + MKDEV(0, 0), NULL, "%s-%u",
> + LWMI_OM_FW_ATTR_BASE_PATH,
> + priv->ida_id);
> + if (IS_ERR(priv->fw_attr_dev)) {
> + err = PTR_ERR(priv->fw_attr_dev);
> + goto err_free_ida;
> + }
> +
> + priv->fw_attr_kset = kset_create_and_add("attributes", NULL, &priv->fw_attr_dev->kobj);
> + if (!priv->fw_attr_kset) {
> + err = -ENOMEM;
> + goto err_destroy_classdev;
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(cd01_attr_groups) - 1; i++) {
> + err = sysfs_create_group(&priv->fw_attr_kset->kobj, cd01_attr_groups[i].attr_group);
> + if (err)
> + goto err_remove_groups;
> +
> + cd01_attr_groups[i].tunable_attr->dev = &priv->wdev->dev;
> + }
> + return 0;
> +
> +err_remove_groups:
> + while (i--)
> + sysfs_remove_group(&priv->fw_attr_kset->kobj, cd01_attr_groups[i].attr_group);
> +
> + kset_unregister(priv->fw_attr_kset);
> +
> +err_destroy_classdev:
> + device_unregister(priv->fw_attr_dev);
> +
> +err_free_ida:
> + ida_free(&lwmi_om_ida, priv->ida_id);
> + return err;
> +}
> +
> +/**
> + * lwmi_om_fw_attr_remove() - Unregister all capability data attribute groups
> + * @priv: the lenovo-wmi-other driver data.
> + */
> +static void lwmi_om_fw_attr_remove(struct lwmi_om_priv *priv)
> +{
> + for (unsigned int i = 0; i < ARRAY_SIZE(cd01_attr_groups) - 1; i++)
> + sysfs_remove_group(&priv->fw_attr_kset->kobj, cd01_attr_groups[i].attr_group);
> +
> + kset_unregister(priv->fw_attr_kset);
> + device_unregister(priv->fw_attr_dev);
Please do the ida cleanup here to ensure that lwmi_om_fw_attr_add() was called previously
and initialized priv->ida.
Otherwise the driver looks good to me.
Thanks,
Armin Wolf
> +}
> +
> +/**
> + * lwmi_om_master_bind() - Bind all components of the other mode driver
> + * @dev: The lenovo-wmi-other driver basic device.
> + *
> + * Call component_bind_all to bind the lenovo-wmi-capdata01 driver to the
> + * lenovo-wmi-other master driver. On success, assign the capability data 01
> + * list pointer to the driver data struct for later access. This pointer
> + * is only valid while the capdata01 interface exists. Finally, register all
> + * firmware attribute groups.
> + *
> + * Return: 0 on success, or an error.
> + */
> +static int lwmi_om_master_bind(struct device *dev)
> +{
> + struct lwmi_om_priv *priv = dev_get_drvdata(dev);
> + struct cd01_list *tmp_list;
> + int ret;
> +
> + ret = component_bind_all(dev, &tmp_list);
> + if (ret)
> + return ret;
> +
> + priv->cd01_list = tmp_list;
> +
> + if (!priv->cd01_list)
> + return -ENODEV;
> +
> + return lwmi_om_fw_attr_add(priv);
> +}
> +
> +/**
> + * lwmi_om_master_unbind() - Unbind all components of the other mode driver
> + * @dev: The lenovo-wmi-other driver basic device
> + *
> + * Unregister all capability data attribute groups. Then call
> + * component_unbind_all to unbind the lenovo-wmi-capdata01 driver from the
> + * lenovo-wmi-other master driver. Finally, free the IDA for this device.
> + */
> +static void lwmi_om_master_unbind(struct device *dev)
> +{
> + struct lwmi_om_priv *priv = dev_get_drvdata(dev);
> +
> + lwmi_om_fw_attr_remove(priv);
> + component_unbind_all(dev, NULL);
> +}
> +
> +static const struct component_master_ops lwmi_om_master_ops = {
> + .bind = lwmi_om_master_bind,
> + .unbind = lwmi_om_master_unbind,
> +};
> +
> +static int lwmi_other_probe(struct wmi_device *wdev, const void *context)
> +{
> + struct component_match *master_match = NULL;
> + struct lwmi_om_priv *priv;
> +
> + priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->wdev = wdev;
> + dev_set_drvdata(&wdev->dev, priv);
> +
> + component_match_add(&wdev->dev, &master_match, lwmi_cd01_match, NULL);
> + if (IS_ERR(master_match))
> + return PTR_ERR(master_match);
> +
> + return component_master_add_with_match(&wdev->dev, &lwmi_om_master_ops,
> + master_match);
> +}
> +
> +static void lwmi_other_remove(struct wmi_device *wdev)
> +{
> + struct lwmi_om_priv *priv = dev_get_drvdata(&wdev->dev);
> +
> + component_master_del(&wdev->dev, &lwmi_om_master_ops);
> + ida_free(&lwmi_om_ida, priv->ida_id);
> +}
> +
> +static const struct wmi_device_id lwmi_other_id_table[] = {
> + { LENOVO_OTHER_MODE_GUID, NULL },
> + {}
> +};
> +
> +static struct wmi_driver lwmi_other_driver = {
> + .driver = {
> + .name = "lenovo_wmi_other",
> + .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> + },
> + .id_table = lwmi_other_id_table,
> + .probe = lwmi_other_probe,
> + .remove = lwmi_other_remove,
> + .no_singleton = true,
> +};
> +
> +module_wmi_driver(lwmi_other_driver);
> +
> +MODULE_IMPORT_NS("LENOVO_WMI_CD01");
> +MODULE_IMPORT_NS("LENOVO_WMI_HELPERS");
> +MODULE_DEVICE_TABLE(wmi, lwmi_other_id_table);
> +MODULE_AUTHOR("Derek J. Clark <derekjohn.clark@...il.com>");
> +MODULE_DESCRIPTION("Lenovo Other Mode WMI Driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/platform/x86/lenovo-wmi-other.h b/drivers/platform/x86/lenovo-wmi-other.h
> new file mode 100644
> index 000000000000..49bc3521e184
> --- /dev/null
> +++ b/drivers/platform/x86/lenovo-wmi-other.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +
> +/* Copyright(C) 2025 Derek J. Clark <derekjohn.clark@...il.com> */
> +
> +#ifndef _LENOVO_WMI_OTHER_H_
> +#define _LENOVO_WMI_OTHER_H_
> +
> +struct device;
> +struct notifier_block;
> +
> +int lwmi_om_register_notifier(struct notifier_block *nb);
> +int lwmi_om_unregister_notifier(struct notifier_block *nb);
> +int devm_lwmi_om_register_notifier(struct device *dev,
> + struct notifier_block *nb);
> +
> +#endif /* !_LENOVO_WMI_OTHER_H_ */
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