[PATCH 5.15 40/93] platform/x86: think-lmi: Clean up display of current_value on Thinkstation

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From: Mark Pearson <mpearson-lenovo@xxxxxxxxx>

[ Upstream commit 7065655216d4d034d71164641f3bec0b189ad6fa ]

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@xxxxxxx>
Link: https://github.com/fwupd/fwupd/issues/5077#issuecomment-1488730526
Signed-off-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230403013120.2105-2-mpearson-lenovo@xxxxxxxxx
Tested-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Tested-by: Mirsad Goran Todorovac <mirsad.todorovac@xxxxxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/platform/x86/think-lmi.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index ded3aacb26cc9..76f0d04e17f30 100644
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -504,7 +504,7 @@ 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);
@@ -515,9 +515,12 @@ 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
+	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






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