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Message-ID: <CAFqHKTmd12wZdCK_-+SbGNdvwzXTawmu9ob3_k1cHoy0XBVS-Q@mail.gmail.com>
Date: Thu, 2 Jan 2025 10:49:56 -0800
From: Derek John Clark <derekjohn.clark@...il.com>
To: Mario Limonciello <superm1@...nel.org>
Cc: Hans de Goede <hdegoede@...hat.com>, Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
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 Wed, Jan 1, 2025 at 7:40 PM Mario Limonciello <superm1@...nel.org> wrote:
>
>
>
> 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.
>
Something I was going to add a quirk for based on some bad gouge but
missed in my cleanup. I'll remove.
> > +
> > +/* 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.
>
Acked.
> > + 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.
>
In this case it may be needed, discussion ongoing in thread 0/4.
> > + 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?
>
Easy fix, will do. I'll also add a wmi_dev_exists() here before the
loop to exit early.
> > + 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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