Re: [PATCH v7 10/16] platform/x86: lenovo-wmi-other: Add lwmi_attr_id() function

From: Mark Pearson

Date: Mon Apr 06 2026 - 14:53:12 EST

On Mon, Apr 6, 2026, at 2:45 PM, Derek John Clark wrote:
> On Sat, Apr 4, 2026 at 5:16 PM Mark Pearson <mpearson-lenovo@xxxxxxxxx> wrote:
>>
>> Hi Derek,
>>
>> On Wed, Apr 1, 2026, at 11:24 PM, Derek J. Clark wrote:
>> > Adds lwmi_attr_id() function. In the same vein as LWMI_ATTR_ID_FAN_RPM(),
>> > but as a generic, to de-duplicate attribute_id assignment biolerplate.
>> >
>> > Reviewed-by: Rong Zhang <i@xxxxxxxx>
>> > Tested-by: Rong Zhang <i@xxxxxxxx>
>> > Reviewed-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx>
>> > Signed-off-by: Derek J. Clark <derekjohn.clark@xxxxxxxxx>
>> > ---
>> > v7:
>> > - Incorporate additional replacements in lwmi_attr_01_is_supported
>> > after moving the patch that adds it to earlier in the series.
>> > v6:
>> > - Move lwmi_attr_id to wmi-capdata.h as static inline.
>> > v5:
>> > - Move references to cv/cd_mode_id to patch 4/8.
>> > - Move lwmi_attr_id to wmi-capdata.c and export with namespace.
>> > v4:
>> > - Switch from macro to static inline to preserve types.
>> > ---
>> > drivers/platform/x86/lenovo/wmi-capdata.c | 8 ++--
>> > drivers/platform/x86/lenovo/wmi-capdata.h | 20 ++++++++
>> > drivers/platform/x86/lenovo/wmi-other.c | 56 ++++++++---------------
>> > 3 files changed, 43 insertions(+), 41 deletions(-)
>> >
>> > diff --git a/drivers/platform/x86/lenovo/wmi-capdata.c
>> > b/drivers/platform/x86/lenovo/wmi-capdata.c
>> > index ee1fb02d8e31..169665be4dcf 100644
>> > --- a/drivers/platform/x86/lenovo/wmi-capdata.c
>> > +++ b/drivers/platform/x86/lenovo/wmi-capdata.c
>> > @@ -27,7 +27,6 @@
>> > #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>> >
>> > #include <linux/acpi.h>
>> > -#include <linux/bitfield.h>
>> > #include <linux/bug.h>
>> > #include <linux/cleanup.h>
>> > #include <linux/component.h>
>> > @@ -48,6 +47,7 @@
>> > #include <linux/wmi.h>
>> >
>> > #include "wmi-capdata.h"
>> > +#include "wmi-helpers.h"
>> >
>> > #define LENOVO_CAPABILITY_DATA_00_GUID "362A3AFE-3D96-4665-8530-96DAD5BB300E"
>> > #define LENOVO_CAPABILITY_DATA_01_GUID "7A8F5407-CB67-4D6E-B547-39B3BE018154"
>> > @@ -58,9 +58,9 @@
>> >
>> > #define LWMI_FEATURE_ID_FAN_TEST 0x05
>> >
>> > -#define LWMI_ATTR_ID_FAN_TEST \
>> > - (FIELD_PREP(LWMI_ATTR_DEV_ID_MASK, LWMI_DEVICE_ID_FAN) | \
>> > - FIELD_PREP(LWMI_ATTR_FEAT_ID_MASK, LWMI_FEATURE_ID_FAN_TEST))
>> > +#define LWMI_ATTR_ID_FAN_TEST \
>> > + lwmi_attr_id(LWMI_DEVICE_ID_FAN, LWMI_FEATURE_ID_FAN_TEST, \
>> > + LWMI_GZ_THERMAL_MODE_NONE, LWMI_TYPE_ID_NONE)
>> >
>> > enum lwmi_cd_type {
>> > LENOVO_CAPABILITY_DATA_00,
>> > diff --git a/drivers/platform/x86/lenovo/wmi-capdata.h
>> > b/drivers/platform/x86/lenovo/wmi-capdata.h
>> > index 8c1df3efcc55..1388eaf4ab4a 100644
>> > --- a/drivers/platform/x86/lenovo/wmi-capdata.h
>> > +++ b/drivers/platform/x86/lenovo/wmi-capdata.h
>> > @@ -6,6 +6,7 @@
>> > #define _LENOVO_WMI_CAPDATA_H_
>> >
>> > #include <linux/bits.h>
>> > +#include <linux/bitfield.h>
>> > #include <linux/types.h>
>> >
>> > #define LWMI_SUPP_VALID BIT(0)
>> > @@ -19,6 +20,8 @@
>> >
>> > #define LWMI_DEVICE_ID_FAN 0x04
>> >
>> > +#define LWMI_TYPE_ID_NONE 0x00
>> > +
>> > struct component_match;
>> > struct device;
>> > struct cd_list;
>> > @@ -57,6 +60,23 @@ struct lwmi_cd_binder {
>> > cd_list_cb_t cd_fan_list_cb;
>> > };
>> >
>> > +/**
>> > + * lwmi_attr_id() - Formats a capability data attribute ID
>> > + * @dev_id: The u8 corresponding to the device ID.
>> > + * @feat_id: The u8 corresponding to the feature ID on the device.
>> > + * @mode_id: The u8 corresponding to the wmi-gamezone mode for set/get.
>> > + * @type_id: The u8 corresponding to the sub-device.
>> > + *
>> > + * Return: u32.
>> > + */
>> > +static inline u32 lwmi_attr_id(u8 dev_id, u8 feat_id, u8 mode_id, u8
>> > type_id)
>> > +{
>> > + return (FIELD_PREP(LWMI_ATTR_DEV_ID_MASK, dev_id) |
>> > + FIELD_PREP(LWMI_ATTR_FEAT_ID_MASK, feat_id) |
>> > + FIELD_PREP(LWMI_ATTR_MODE_ID_MASK, mode_id) |
>> > + FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, type_id));
>> > +}
>> > +
>> > void lwmi_cd_match_add_all(struct device *master, struct
>> > component_match **matchptr);
>> > int lwmi_cd00_get_data(struct cd_list *list, u32 attribute_id, struct
>> > capdata00 *output);
>> > int lwmi_cd01_get_data(struct cd_list *list, u32 attribute_id, struct
>> > capdata01 *output);
>> > diff --git a/drivers/platform/x86/lenovo/wmi-other.c
>> > b/drivers/platform/x86/lenovo/wmi-other.c
>> > index 25ddfd54f692..19a072bea2d4 100644
>> > --- a/drivers/platform/x86/lenovo/wmi-other.c
>> > +++ b/drivers/platform/x86/lenovo/wmi-other.c
>> > @@ -27,7 +27,6 @@
>> > */
>> >
>> > #include <linux/acpi.h>
>> > -#include <linux/bitfield.h>
>> > #include <linux/cleanup.h>
>> > #include <linux/component.h>
>> > #include <linux/container_of.h>
>> > @@ -59,8 +58,6 @@
>> >
>> > #define LWMI_FEATURE_ID_FAN_RPM 0x03
>> >
>> > -#define LWMI_TYPE_ID_NONE 0x00
>> > -
>> > #define LWMI_FEATURE_VALUE_GET 17
>> > #define LWMI_FEATURE_VALUE_SET 18
>> >
>> > @@ -70,10 +67,9 @@
>> >
>> > #define LWMI_FAN_DIV 100
>> >
>> > -#define LWMI_ATTR_ID_FAN_RPM(x) \
>> > - (FIELD_PREP(LWMI_ATTR_DEV_ID_MASK, LWMI_DEVICE_ID_FAN) | \
>> > - FIELD_PREP(LWMI_ATTR_FEAT_ID_MASK, LWMI_FEATURE_ID_FAN_RPM) | \
>> > - FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, LWMI_FAN_ID(x)))
>> > +#define LWMI_ATTR_ID_FAN_RPM(x) \
>> > + lwmi_attr_id(LWMI_DEVICE_ID_FAN, LWMI_FEATURE_ID_FAN_RPM, \
>> > + LWMI_GZ_THERMAL_MODE_NONE, LWMI_FAN_ID(x))
>> >
>> > #define LWMI_OM_FW_ATTR_BASE_PATH "lenovo-wmi-other"
>> > #define LWMI_OM_HWMON_NAME "lenovo_wmi_other"
>> > @@ -616,12 +612,8 @@ static ssize_t attr_capdata01_show(struct kobject *kobj,
>> > u32 attribute_id;
>> > int value, ret;
>> >
>> > - 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);
>> > + attribute_id = lwmi_attr_id(tunable_attr->device_id, tunable_attr->feature_id,
>> > + LWMI_GZ_THERMAL_MODE_CUSTOM, tunable_attr->type_id);
>> >
>> > ret = lwmi_cd01_get_data(priv->cd01_list, attribute_id, &capdata);
>> > if (ret)
>> > @@ -686,10 +678,8 @@ static ssize_t attr_current_value_store(struct
>> > kobject *kobj,
>> > if (mode != LWMI_GZ_THERMAL_MODE_CUSTOM)
>> > return -EBUSY;
>> >
>> > - args.arg0 = 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, tunable_attr->cd_mode_id) |
>> > - FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, tunable_attr->type_id);
>> > + args.arg0 = lwmi_attr_id(tunable_attr->device_id, tunable_attr->feature_id,
>> > + tunable_attr->cd_mode_id, tunable_attr->type_id);
>> >
>> > ret = lwmi_cd01_get_data(priv->cd01_list, args.arg0, &capdata);
>> > if (ret)
>> > @@ -702,10 +692,8 @@ static ssize_t attr_current_value_store(struct
>> > kobject *kobj,
>> > if (value < capdata.min_value || value > capdata.max_value)
>> > return -EINVAL;
>> >
>> > - args.arg0 = 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, tunable_attr->cv_mode_id) |
>> > - FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, tunable_attr->type_id);
>> > + args.arg0 = lwmi_attr_id(tunable_attr->device_id, tunable_attr->feature_id,
>> > + tunable_attr->cv_mode_id, tunable_attr->type_id);
>> > args.arg1 = value;
>> >
>> > ret = lwmi_dev_evaluate_int(priv->wdev, 0x0, LWMI_FEATURE_VALUE_SET,
>> > @@ -750,10 +738,8 @@ static ssize_t attr_current_value_show(struct
>> > kobject *kobj,
>> > if (tunable_attr->cv_mode_id == LWMI_GZ_THERMAL_MODE_NONE)
>> > mode = tunable_attr->cv_mode_id;
>> >
>> > - args.arg0 = 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 = lwmi_attr_id(tunable_attr->device_id, tunable_attr->feature_id,
>> > + tunable_attr->cv_mode_id, tunable_attr->type_id);
>> >
>> > ret = lwmi_dev_evaluate_int(priv->wdev, 0x0, LWMI_FEATURE_VALUE_GET,
>> > (unsigned char *)&args, sizeof(args),
>> > @@ -794,10 +780,8 @@ static bool lwmi_attr_01_is_supported(struct
>> > tunable_attr_01 *tunable_attr)
>> >
>> > /* Determine tunable_attr->cd_mode_id*/
>> > for (i = 0; i < ARRAY_SIZE(modes); i++) {
>> > - args.arg0 = 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, modes[i]) |
>> > - FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, tunable_attr->type_id);
>> > + args.arg0 = lwmi_attr_id(tunable_attr->device_id, tunable_attr->feature_id,
>> > + modes[i], tunable_attr->type_id);
>> >
>> > ret = lwmi_cd01_get_data(priv->cd01_list, args.arg0, &capdata);
>> > if (ret || !capdata.supported)
>> > @@ -810,15 +794,10 @@ static bool lwmi_attr_01_is_supported(struct
>> > tunable_attr_01 *tunable_attr)
>> > if (!cd_mode_found)
>> > return cd_mode_found;
>> >
>> > - dev_dbg(tunable_attr->dev,
>> > - "cd_mode_id: %#010x\n", args.arg0);
>> > -
>> > /* Determine tunable_attr->cv_mode_id, returns 1 if supported*/
>> > for (i = 0; i < ARRAY_SIZE(modes); i++) {
>> > - args.arg0 = 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, modes[i]) |
>> > - FIELD_PREP(LWMI_ATTR_TYPE_ID_MASK, tunable_attr->type_id);
>> > + args.arg0 = lwmi_attr_id(tunable_attr->device_id, tunable_attr->feature_id,
>> > + modes[i], tunable_attr->type_id);
>> >
>> > ret = lwmi_dev_evaluate_int(priv->wdev, 0x0, LWMI_FEATURE_VALUE_GET,
>> > (unsigned char *)&args, sizeof(args),
>> > @@ -833,7 +812,10 @@ static bool lwmi_attr_01_is_supported(struct
>> > tunable_attr_01 *tunable_attr)
>> > if (!cv_mode_found)
>> > return cv_mode_found;
>> >
>> > - dev_dbg(tunable_attr->dev, "cv_mode_id: %#010x, attribute support
>> > level: %#010x\n",
>> > + dev_dbg(tunable_attr->dev,
>> > + "cd_mode_id: %#010x, cv_mode_id: %#010x, attribute support level:
>> > %#010x\n",
>> > + lwmi_attr_id(tunable_attr->device_id, tunable_attr->feature_id,
>> > + tunable_attr->cd_mode_id, tunable_attr->type_id),
>> > args.arg0, capdata.supported);
>> >
>>
>> Minor comment, but I did wonder if it would be better to have two args in this function:
>> struct wmi_method_args_32 cv_mode_args = { 0x0, 0x0 };
>> struct wmi_method_args_32 cd_mode_args = { 0x0, 0x0 };
>>
>> Just because later (patch 10) you end up having to do the calculation twice due to the dev_dbg call?
>>
>> Mark
>
> I have no strong feelings either way. Seems like a minor enough change
> that I can do it for v8, but I'd like to avoid flip flopping on this
> if its going to delay the patch.
>
Fair enough. I don't feel strongly about it either :)

Mark