linux-kernel - [PATCH 3/7] platform/x86: think-lmi: Use WMI bus API when accessing BIOS settings

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Message-Id: <20250203182322.384883-4-W_Armin@gmx.de>
Date: Mon,  3 Feb 2025 19:23:18 +0100
From: Armin Wolf <W_Armin@....de>
To: james@...iv.tech,
	markpearson@...ovo.com,
	jorge.lopez2@...com
Cc: jdelvare@...e.com,
	linux@...ck-us.net,
	linux-hwmon@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com,
	platform-driver-x86@...r.kernel.org,
	corbet@....net,
	linux-doc@...r.kernel.org
Subject: [PATCH 3/7] platform/x86: think-lmi: Use WMI bus API when accessing BIOS settings

Since the driver already binds to LENOVO_BIOS_SETTING_GUID, using
wmidev_block_query() inside tlmi_setting() allows for faster
access to BIOS settings.

Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/platform/x86/think-lmi.c | 23 +++++++++--------------
 drivers/platform/x86/think-lmi.h |  2 ++
 2 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index 2c94a4af9a1d..0fc275e461be 100644
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -344,20 +344,14 @@ static int tlmi_opcode_setting(char *setting, const char *value)
 	return ret;
 }

-static int tlmi_setting(int item, char **value, const char *guid_string)
+static int tlmi_setting(struct wmi_device *wdev, int item, char **value)
 {
-	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 	union acpi_object *obj;
-	acpi_status status;
 	int ret;

-	status = wmi_query_block(guid_string, item, &output);
-	if (ACPI_FAILURE(status))
-		return -EIO;
-
-	obj = output.pointer;
+	obj = wmidev_block_query(wdev, item);
 	if (!obj)
-		return -ENODATA;
+		return -EIO;

 	ret = tlmi_extract_output_string(obj, value);
 	kfree(obj);
@@ -995,7 +989,7 @@ static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *a
 	char *item, *value;
 	int ret;

-	ret = tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID);
+	ret = tlmi_setting(setting->wdev, setting->index, &item);
 	if (ret)
 		return ret;

@@ -1588,7 +1582,7 @@ static struct tlmi_pwd_setting *tlmi_create_auth(const char *pwd_type,
 	return new_pwd;
 }

-static int tlmi_analyze(void)
+static int tlmi_analyze(struct wmi_device *wdev)
 {
 	int i, ret;

@@ -1625,7 +1619,7 @@ static int tlmi_analyze(void)
 		char *item = NULL;

 		tlmi_priv.setting[i] = NULL;
-		ret = tlmi_setting(i, &item, LENOVO_BIOS_SETTING_GUID);
+		ret = tlmi_setting(wdev, i, &item);
 		if (ret)
 			break;
 		if (!item)
@@ -1648,6 +1642,7 @@ static int tlmi_analyze(void)
 			kfree(item);
 			goto fail_clear_attr;
 		}
+		setting->wdev = wdev;
 		setting->index = i;
 		strscpy(setting->display_name, item);
 		/* If BIOS selections supported, load those */
@@ -1666,7 +1661,7 @@ static int tlmi_analyze(void)
 			 */
 			char *optitem, *optstart, *optend;

-			if (!tlmi_setting(setting->index, &optitem, LENOVO_BIOS_SETTING_GUID)) {
+			if (!tlmi_setting(setting->wdev, setting->index, &optitem)) {
 				optstart = strstr(optitem, "[Optional:");
 				if (optstart) {
 					optstart += strlen("[Optional:");
@@ -1791,7 +1786,7 @@ static int tlmi_probe(struct wmi_device *wdev, const void *context)
 {
 	int ret;

-	ret = tlmi_analyze();
+	ret = tlmi_analyze(wdev);
 	if (ret)
 		return ret;

diff --git a/drivers/platform/x86/think-lmi.h b/drivers/platform/x86/think-lmi.h
index f267d8b46957..a80452482227 100644
--- a/drivers/platform/x86/think-lmi.h
+++ b/drivers/platform/x86/think-lmi.h
@@ -4,6 +4,7 @@
 #define _THINK_LMI_H_

 #include <linux/types.h>
+#include <linux/wmi.h>

 #define TLMI_SETTINGS_COUNT  256
 #define TLMI_SETTINGS_MAXLEN 512
@@ -87,6 +88,7 @@ struct tlmi_pwd_setting {
 /* Attribute setting details */
 struct tlmi_attr_setting {
 	struct kobject kobj;
+	struct wmi_device *wdev;
 	int index;
 	char display_name[TLMI_SETTINGS_MAXLEN];
 	char *possible_values;
--
2.39.5