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Message-ID: <8620c791-4cf0-44fe-9869-18be4baed465@kernel.org>
Date: Wed, 1 Jan 2025 21:40:54 -0600
From: Mario Limonciello <superm1@...nel.org>
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>, 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 v2 4/4] platform/x86: Add Lenovo Other Mode WMI Driver
On 1/1/25 18:47, Derek J. Clark wrote:
> Adds lenovo-wmi-other.c which provides a driver for 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.
>
> v2:
> - Use devm_kzalloc 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.
>
> Signed-off-by: Derek J. Clark <derekjohn.clark@...il.com>
> ---
> MAINTAINERS | 1 +
> drivers/platform/x86/Kconfig | 12 +
> drivers/platform/x86/Makefile | 1 +
> drivers/platform/x86/lenovo-wmi-other.c | 385 ++++++++++++++++++++++++
> drivers/platform/x86/lenovo-wmi.h | 116 +++++++
> 5 files changed, 515 insertions(+)
> create mode 100644 drivers/platform/x86/lenovo-wmi-other.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c9374c395905..318e1e517eed 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -13040,6 +13040,7 @@ L: platform-driver-x86@...r.kernel.org
> S: Maintained
> F: drivers/platform/x86/lenovo-wmi-capdata01.c
> F: drivers/platform/x86/lenovo-wmi-gamezone.c
> +F: drivers/platform/x86/lenovo-wmi-other.c
> F: drivers/platform/x86/lenovo-wmi.h
>
> LETSKETCH HID TABLET DRIVER
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index a2c1ab47ad9e..e2285ab987c5 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -481,6 +481,18 @@ config LENOVO_WMI_DATA01
> To compile this driver as a module, choose M here: the module will
> be called lenovo_wmi_capdata01.
>
> +config LENOVO_WMI_TUNING
> + tristate "Lenovo Other Method WMI Driver"
> + depends on LENOVO_WMI_DATA01
> + select FW_ATTR_CLASS
> + 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 6c96cc3f3855..3e059b3c3647 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -70,6 +70,7 @@ obj-$(CONFIG_YT2_1380) += lenovo-yoga-tab2-pro-1380-fastcharger.o
> obj-$(CONFIG_LENOVO_WMI_CAMERA) += lenovo-wmi-camera.o
> obj-$(CONFIG_LENOVO_WMI_GAMEZONE) += lenovo-wmi-gamezone.o
> obj-$(CONFIG_LENOVO_WMI_DATA01) += lenovo-wmi-capdata01.o
> +obj-$(CONFIG_LENOVO_WMI_TUNING) += lenovo-wmi-other.o
>
> # Intel
> obj-y += intel/
> diff --git a/drivers/platform/x86/lenovo-wmi-other.c b/drivers/platform/x86/lenovo-wmi-other.c
> new file mode 100644
> index 000000000000..2392faa74973
> --- /dev/null
> +++ b/drivers/platform/x86/lenovo-wmi-other.c
> @@ -0,0 +1,385 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Lenovo Other Method WMI interface driver. This driver uses the fw_attributes
> + * class to expose the various WMI functions provided by the "Other Method" 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 Method"" interface has a
> + * corresponding LENOVO_CAPABILITY_DATA_01 struct that allows the driver to
> + * probe details about the attribute such as set/get support, step, min, max,
> + * and default value. Each attibute has multiple pages, one for each of the
> + * fan profiles managed by the GameZone interface, so it must be probed prior
> + * to returning the current_value.
> + *
> + * 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) 2024 Derek J. Clark <derekjohn.clark@...il.com>
> + */
> +
> +#include <linux/list.h>
> +#include "lenovo-wmi.h"
> +#include "firmware_attributes_class.h"
> +
> +#define FW_ATTR_FOLDER "lenovo-wmi-other"
> +#define LENOVO_OTHER_METHOD_GUID "DC2A8805-3A8C-41BA-A6F7-092E0089CD3B"
> +
> +/* Device IDs */
> +#define WMI_DEVICE_ID_CPU 0x01
> +
> +/* WMI_DEVICE_ID_CPU feature IDs */
> +#define WMI_FEATURE_ID_CPU_SPPT 0x01 /* Short Term Power Limit */
> +#define WMI_FEATURE_ID_CPU_FPPT 0x03 /* Long Term Power Limit */
> +#define WMI_FEATURE_ID_CPU_SPL 0x02 /* Peak Power Limit */
> +#define WMI_FEATURE_ID_CPU_FPPT_BAD 0x03 /* Long Term Power Limit */
What exactly is WMI_FEATURE_ID_CPU_FPPT_BAD? I don't see it used in the
code at all.
> +
> +/* Method IDs */
> +#define WMI_METHOD_ID_VALUE_GET 17 /* Other Method Getter */
> +#define WMI_METHOD_ID_VALUE_SET 18 /* Other Method Setter */
> +
> +static DEFINE_MUTEX(call_mutex);
> +static DEFINE_MUTEX(om_list_mutex);
> +static LIST_HEAD(om_wmi_list);
> +
> +struct lenovo_wmi_om_priv {
> + struct wmi_device *wdev;
> + struct device *fw_attr_dev;
> + struct kset *fw_attr_kset;
> + struct list_head list;
> +};
> +
> +static inline struct lenovo_wmi_om_priv *get_first_wmi_priv(void)
> +{
> + guard(mutex)(&om_list_mutex);
> + return list_first_entry_or_null(&om_wmi_list, struct lenovo_wmi_om_priv,
> + list);
> +}
> +
> +static const struct wmi_device_id lenovo_wmi_other_id_table[] = {
> + { LENOVO_OTHER_METHOD_GUID, NULL },
> + {}
> +};
> +
> +/* Tunable Attributes */
> +struct tunable_attr_01 ppt_pl1_spl = { .device_id = WMI_DEVICE_ID_CPU,
> + .feature_id = WMI_FEATURE_ID_CPU_SPL };
> +struct tunable_attr_01 ppt_pl2_sppt = { .device_id = WMI_DEVICE_ID_CPU,
> + .feature_id = WMI_FEATURE_ID_CPU_SPPT };
> +struct tunable_attr_01 ppt_pl3_fppt = { .device_id = WMI_DEVICE_ID_CPU,
> + .feature_id = WMI_FEATURE_ID_CPU_FPPT };
> +
> +struct capdata01_attr_group {
> + const struct attribute_group *attr_group;
> + struct tunable_attr_01 *tunable_attr;
> +};
> +
> +static const struct class *fw_attr_class;
> +
> +/**
> + * attr_capdata01_setup() - Get the data of the specified attribute
> + * from LENOVO_CAPABILITY_DATA_01 and store it.
> + * @tunable_attr: The attribute to be populated.
> + *
> + * Returns: Either 0 or an error.
> + */
> +static int attr_capdata01_setup(struct tunable_attr_01 *tunable_attr)
> +{
> + struct capability_data_01 cap_data;
> + int mode = SMARTFAN_MODE_CUSTOM;
> + int err;
> +
Why the whitespace here? Seems unnecessary.
> + struct lenovo_wmi_attr_id attr_id = { mode << 8,
As mode is only used here, I would just do:
{ SMARTFAN_MODE_CUSTOM << 8,
To avoid the extra variable.
> + tunable_attr->feature_id,
> + tunable_attr->device_id };
> +
> + err = lenovo_wmi_capdata01_get(attr_id, &cap_data);
> + if (err) {
> + pr_err("Failed to get capability data: %u\n", err);
> + return err;
> + }
> +
> + if (cap_data.supported < 1)
> + return -EOPNOTSUPP;
> +
> + tunable_attr->capdata = cap_data;
> +
> + return 0;
> +}
> +
> +/**
> + * attr_capdata01_show() - Get the value of the specified attribute property
> + * from LENOVO_CAPABILITY_DATA_01.
> + * @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.
> + *
> + * This function is intended to be generic so it can be called from any "_show"
> + * attribute which works only with integers.
> + *
> + * If the WMI is success, then the sysfs attribute is notified.
> + *
> + * Returns: Either count, or an error.
> + */
> +ssize_t attr_capdata01_show(struct kobject *kobj, struct kobj_attribute *attr,
> + char *buf, struct tunable_attr_01 *tunable_attr,
> + enum attribute_property prop)
> +{
> + struct capability_data_01 cap_data;
> + int retval;
> +
> + cap_data = tunable_attr->capdata;
> +
> + switch (prop) {
> + case DEFAULT_VAL:
> + retval = cap_data.default_value;
> + break;
> + case MAX_VAL:
> + retval = cap_data.max_value;
> + break;
> + case MIN_VAL:
> + retval = cap_data.min_value;
> + break;
> + case STEP_VAL:
> + retval = cap_data.step;
> + break;
> + default:
> + return -EINVAL;
> + }
> + return sysfs_emit(buf, "%u\n", retval);
> +}
> +
> +/* Simple attribute creation */
> +
> +/*
> + * 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.
> + *
> + * This function is intended to be generic so it can be called from any
> + * attribute's "current_value_store" which works only with integers. The
> + * integer to be sent to the WMI method is range checked and an error returned
> + * if out of range.
> + *
> + * If the value is valid and WMI is success, then the sysfs attribute is
> + * notified.
> + *
> + * Returns: Either count, or an error.
> + */
> +ssize_t attr_current_value_store(struct kobject *kobj,
> + struct kobj_attribute *attr, const char *buf,
> + size_t count,
> + struct tunable_attr_01 *tunable_attr)
> +{
> + struct capability_data_01 cap_data;
> + struct lenovo_wmi_om_priv *priv;
> + int mode = SMARTFAN_MODE_CUSTOM;
> + u32 value;
> + int err;
> +
> + struct lenovo_wmi_attr_id attr_id = { mode << 8,
Similar comment about the mode here too.
> + tunable_attr->feature_id,
> + tunable_attr->device_id };
> +
> + err = kstrtouint(buf, 10, &value);
> + if (err) {
> + pr_err("Error converting value to int: %u\n", err);
> + return err;
> + }
> +
> + cap_data = tunable_attr->capdata;
> +
> + if (value < cap_data.min_value || value > cap_data.max_value)
> + return -EINVAL;
> +
> + priv = get_first_wmi_priv();
> + if (!priv)
> + return -ENODEV;
> +
> + guard(mutex)(&call_mutex);
> + err = lenovo_wmidev_evaluate_method_2(priv->wdev, 0x0,
> + WMI_METHOD_ID_VALUE_SET,
> + *(int *)&attr_id, value, NULL);
> +
> + if (err) {
> + pr_err("Error setting attribute: %u\n", err);
> + return err;
> + }
> +
> + tunable_attr->store_value = value;
> +
> + sysfs_notify(kobj, NULL, attr->attr.name);
> +
> + 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.
> + *
> + * This function is intended to be generic so it can be called from any "_show"
> + * attribute which works only with integers.
> + *
> + * If the WMI is success, then the sysfs attribute is notified.
> + *
> + * Returns: Either count, or an error.
> + */
> +ssize_t attr_current_value_show(struct kobject *kobj,
> + struct kobj_attribute *attr, char *buf,
> + struct tunable_attr_01 *tunable_attr)
> +{
> + struct lenovo_wmi_om_priv *priv;
> + int mode = SMARTFAN_MODE_CUSTOM;
> + int retval;
> + int err;
> +
> + struct lenovo_wmi_attr_id attr_id = { mode << 8,
Same comment about SMARTFAN_MODE_CUSTOM here.
> + tunable_attr->feature_id,
> + tunable_attr->device_id };
> +
> + priv = get_first_wmi_priv();
> + if (!priv)
> + return -ENODEV;
> +
> + guard(mutex)(&call_mutex);
> + err = lenovo_wmidev_evaluate_method_1(priv->wdev, 0x0,
> + WMI_METHOD_ID_VALUE_GET,
> + *(int *)&attr_id, &retval);
> +
> + if (err) {
> + pr_err("Error getting attribute: %u\n", err);
> + return err;
> + }
> +
> + return sysfs_emit(buf, "%u\n", retval);
> +}
> +
> +ATTR_GROUP_LL_TUNABLE_CAP01(ppt_pl1_spl, "ppt_pl1_spl",
> + "Set the CPU sustained power limit");
> +ATTR_GROUP_LL_TUNABLE_CAP01(ppt_pl2_sppt, "ppt_pl2_sppt",
> + "Set the CPU slow package power tracking limit");
> +ATTR_GROUP_LL_TUNABLE_CAP01(ppt_pl3_fppt, "ppt_pl3_fppt",
> + "Set the CPU fast package power tracking limit");
> +
> +static const struct capdata01_attr_group capdata01_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 },
> + {},
> +};
> +
> +static int other_method_fw_attr_add(struct lenovo_wmi_om_priv *priv)
> +{
> + int err, i;
> +
> + err = fw_attributes_class_get(&fw_attr_class);
> + if (err) {
> + pr_err("Failed to get firmware_attributes_class: %u\n", err);
> + return err;
> + }
> +
> + priv->fw_attr_dev = device_create(fw_attr_class, NULL, MKDEV(0, 0),
> + NULL, "%s", FW_ATTR_FOLDER);
> + if (IS_ERR(priv->fw_attr_dev)) {
> + err = PTR_ERR(priv->fw_attr_dev);
> + pr_err("Failed to create firmware_attributes_class device: %u\n",
> + err);
> + goto fail_class_get;
> + }
> +
> + priv->fw_attr_kset = kset_create_and_add("attributes", NULL,
> + &priv->fw_attr_dev->kobj);
> + if (!priv->fw_attr_kset) {
> + err = -ENOMEM;
> + pr_err("Failed to create firmware_attributes_class kset: %u\n",
> + err);
> + goto err_destroy_classdev;
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(capdata01_attr_groups) - 1; i++) {
> + err = attr_capdata01_setup(
> + capdata01_attr_groups[i].tunable_attr);
> + if (err) {
> + pr_err("Failed to populate capability data for %s: %u\n",
> + capdata01_attr_groups[i].attr_group->name, err);
This specific error could be a bit noisy because it's a dependency on
the other driver in case one attribute returns not supported.
Could you instead detect EOPNOTSUPP specifically and only show error if
not EOPNOTSUPP?
> + continue;
> + }
> +
> + err = sysfs_create_group(&priv->fw_attr_kset->kobj,
> + capdata01_attr_groups[i].attr_group);
> + if (err) {
> + pr_err("Failed to create sysfs-group for %s: %u\n",
> + capdata01_attr_groups[i].attr_group->name, err);
> + goto err_remove_groups;
> + }
> + }
> +
> + return 0;
> +
> +err_remove_groups:
> + while (i-- > 0) {
> + sysfs_remove_group(&priv->fw_attr_kset->kobj,
> + capdata01_attr_groups[i].attr_group);
> + }
> +
> + return err;
> +
> +err_destroy_classdev:
> + device_destroy(fw_attr_class, MKDEV(0, 0));
> +
> + return err;
> +
> +fail_class_get:
> + fw_attributes_class_put();
> +
> + return err;
> +}
> +
> +static int lenovo_wmi_other_probe(struct wmi_device *wdev, const void *context)
> +{
> + struct lenovo_wmi_om_priv *priv;
> +
> + priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->wdev = wdev;
> +
> + guard(mutex)(&om_list_mutex);
> + list_add_tail(&priv->list, &om_wmi_list);
> +
> + return other_method_fw_attr_add(priv);
> +}
> +
> +static void lenovo_wmi_other_remove(struct wmi_device *wdev)
> +{
> + struct lenovo_wmi_om_priv *priv = dev_get_drvdata(&wdev->dev);
> +
> + guard(mutex)(&om_list_mutex);
> + list_del(&priv->list);
> + kset_unregister(priv->fw_attr_kset);
> + device_destroy(fw_attr_class, MKDEV(0, 0));
> + fw_attributes_class_put();
> +}
> +
> +static struct wmi_driver lenovo_wmi_other_driver = {
> + .driver = { .name = "lenovo_wmi_other" },
> + .id_table = lenovo_wmi_other_id_table,
> + .probe = lenovo_wmi_other_probe,
> + .remove = lenovo_wmi_other_remove,
> +};
> +
> +module_wmi_driver(lenovo_wmi_other_driver);
> +
> +MODULE_IMPORT_NS("CAPDATA_WMI");
> +MODULE_DEVICE_TABLE(wmi, lenovo_wmi_other_id_table);
> +MODULE_AUTHOR("Derek J. Clark <derekjohn.clark@...il.com>");
> +MODULE_DESCRIPTION("Lenovo Other Method WMI Driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/platform/x86/lenovo-wmi.h b/drivers/platform/x86/lenovo-wmi.h
> index 53cea84a956b..1c8358551ba6 100644
> --- a/drivers/platform/x86/lenovo-wmi.h
> +++ b/drivers/platform/x86/lenovo-wmi.h
> @@ -42,6 +42,14 @@ struct lenovo_wmi_attr_id {
> u32 device_id : 8; /* CPU/GPU/... */
> } __packed;
>
> +enum attribute_property {
> + DEFAULT_VAL,
> + MAX_VAL,
> + MIN_VAL,
> + STEP_VAL,
> + SUPPORTED,
> +};
> +
> /* Data struct for LENOVO_CAPABILITY_DATA_01 */
> struct capability_data_01 {
> u32 id;
> @@ -52,6 +60,14 @@ struct capability_data_01 {
> u32 max_value;
> };
>
> +/* Tunable attribute that uses LENOVO_CAPABILITY_DATA_01 */
> +struct tunable_attr_01 {
> + struct capability_data_01 capdata;
> + u32 device_id;
> + u32 feature_id;
> + u32 store_value;
> +};
> +
> /* General Use functions */
> static int lenovo_wmidev_evaluate_method(struct wmi_device *wdev, u8 instance,
> u32 method_id, struct acpi_buffer *in,
> @@ -122,4 +138,104 @@ int lenovo_wmidev_evaluate_method_1(struct wmi_device *wdev, u8 instance,
> int lenovo_wmi_capdata01_get(struct lenovo_wmi_attr_id attr_id,
> struct capability_data_01 *cap_data);
>
> +/* Other Method attribute functions */
> +ssize_t attr_capdata01_show(struct kobject *kobj, struct kobj_attribute *attr,
> + char *buf, struct tunable_attr_01 *tunable_attr,
> + enum attribute_property prop);
> +
> +ssize_t attr_current_value_store(struct kobject *kobj,
> + struct kobj_attribute *attr, const char *buf,
> + size_t count,
> + struct tunable_attr_01 *tunable_attr);
> +
> +ssize_t attr_current_value_show(struct kobject *kobj,
> + struct kobj_attribute *attr, char *buf,
> + struct tunable_attr_01 *tunable_attr);
> +
> +ssize_t int_type_show(struct kobject *kobj, struct kobj_attribute *attr,
> + char *buf);
> +
> +ssize_t int_type_show(struct kobject *kobj, struct kobj_attribute *attr,
> + char *buf)
> +{
> + return sysfs_emit(buf, "integer\n");
> +}
> +
> +/* Other Method attribute macros */
> +#define __LL_ATTR_RO(_func, _name) \
> + { \
> + .attr = { .name = __stringify(_name), .mode = 0444 }, \
> + .show = _func##_##_name##_show, \
> + }
> +
> +#define __LL_ATTR_RO_AS(_name, _show) \
> + { \
> + .attr = { .name = __stringify(_name), .mode = 0444 }, \
> + .show = _show, \
> + }
> +
> +#define __LL_ATTR_RW(_func, _name) \
> + __ATTR(_name, 0644, _func##_##_name##_show, _func##_##_name##_store)
> +
> +/* 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 = \
> + __LL_ATTR_RO(_attrname, _prop)
> +
> +/* Attribute current_value show/store */
> +#define __LL_TUNABLE_RW_CAP01(_attrname) \
> + static ssize_t _attrname##_current_value_store( \
> + struct kobject *kobj, struct kobj_attribute *attr, \
> + const char *buf, size_t count) \
> + { \
> + return attr_current_value_store(kobj, attr, buf, count, \
> + &_attrname); \
> + } \
> + static ssize_t _attrname##_current_value_show( \
> + struct kobject *kobj, struct kobj_attribute *attr, char *buf) \
> + { \
> + return attr_current_value_show(kobj, attr, buf, &_attrname); \
> + } \
> + static struct kobj_attribute attr_##_attrname##_current_value = \
> + __LL_ATTR_RW(_attrname, current_value)
> +
> +/* Attribute property show only */
> +#define __LL_TUNABLE_RO_CAP01(_prop, _attrname, _prop_type) \
> + static ssize_t _attrname##_##_prop##_show( \
> + struct kobject *kobj, struct kobj_attribute *attr, char *buf) \
> + { \
> + return attr_capdata01_show(kobj, attr, buf, &_attrname, \
> + _prop_type); \
> + } \
> + static struct kobj_attribute attr_##_attrname##_##_prop = \
> + __LL_ATTR_RO(_attrname, _prop)
> +
> +#define ATTR_GROUP_LL_TUNABLE_CAP01(_attrname, _fsname, _dispname) \
> + __LL_TUNABLE_RW_CAP01(_attrname); \
> + __LL_TUNABLE_RO_CAP01(default_value, _attrname, DEFAULT_VAL); \
> + __ATTR_SHOW_FMT(display_name, _attrname, "%s\n", _dispname); \
> + __LL_TUNABLE_RO_CAP01(max_value, _attrname, MAX_VAL); \
> + __LL_TUNABLE_RO_CAP01(min_value, _attrname, MIN_VAL); \
> + __LL_TUNABLE_RO_CAP01(scalar_increment, _attrname, STEP_VAL); \
> + static struct kobj_attribute attr_##_attrname##_type = \
> + __LL_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 \
> + }
> +
> #endif /* !_LENOVO_WMI_H_ */
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