linux-kernel - [PATCH 2/2] platform/x86: think-lmi: Clean up display of current

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Date:   Sat,  1 Apr 2023 14:43:45 -0400
From:   Mark Pearson <mpearson-lenovo@...ebb.ca>
To:     mpearson-lenovo@...ebb.ca
Cc:     hdegoede@...hat.com, markgross@...nel.org, W_Armin@....de,
        mirsad.todorovac@....unizg.hr, linux@...ssschuh.net,
        Mario.Limonciello@....com, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] platform/x86: think-lmi: Clean up display of current_value on Thinkstation

On ThinkStations on retrieving the attribute value the BIOS appends the
possible values to the string.
Clean up the display in the current_value_show function so the options
part is not displayed.

Fixes: a40cd7ef22fb ("platform/x86: think-lmi: Add WMI interface support on Lenovo platforms")
Reported by Mario Limoncello <Mario.Limonciello@....com>
Link: https://github.com/fwupd/fwupd/issues/5077#issuecomment-1488730526
Signed-off-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
---
 drivers/platform/x86/think-lmi.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index ad952b49617b..29e94db03238 100644
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -920,7 +920,7 @@ static ssize_t display_name_show(struct kobject *kobj, struct kobj_attribute *at
 static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
 {
 	struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
-	char *item, *value;
+	char *item, *value, *p;
 	int ret;
 
 	ret = tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID);
@@ -931,11 +931,13 @@ static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *a
 	value = strpbrk(item, ",");
 	if (!value || value == item || !strlen(value + 1))
 		ret = -EINVAL;
-	else
-		ret = sysfs_emit(buf, "%s\n", value + 1);		
-
+	else {
+		/* On Workstations remove the Options part after the value */
+		p = strchrnul(value, ';');
+		*p = '\0';
+		ret = sysfs_emit(buf, "%s\n", value + 1);
+	}
 	kfree(item);
-
 	return ret;
 }
 
-- 
2.39.2