[PATCH 2/4] platform/x86: think-lmi: Add certificate as mechanism

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As both password or certificate authentication are available as mechanisms
update the documentation to add certificate as an option

Update driver to return correct mechanism appropriately.

Signed-off-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-class-firmware-attributes | 2 +-
 drivers/platform/x86/think-lmi.c                          | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-class-firmware-attributes b/Documentation/ABI/testing/sysfs-class-firmware-attributes
index 9c82c7b42ff8..1a8b59f5d6e3 100644
--- a/Documentation/ABI/testing/sysfs-class-firmware-attributes
+++ b/Documentation/ABI/testing/sysfs-class-firmware-attributes
@@ -193,7 +193,7 @@ Description:
 
 		mechanism:
 					The means of authentication.  This attribute is mandatory.
-					Only supported type currently is "password".
+					Supported types are "password" or "certificate".
 
 		max_password_length:
 					A file that can be read to obtain the
diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index 727a9400d406..46ab82fb2898 100644
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -524,6 +524,10 @@ static struct kobj_attribute auth_max_pass_length = __ATTR_RO(max_password_lengt
 static ssize_t mechanism_show(struct kobject *kobj, struct kobj_attribute *attr,
 			 char *buf)
 {
+	struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
+
+	if (setting->cert_installed)
+		return sysfs_emit(buf, "certificate\n");
 	return sysfs_emit(buf, "password\n");
 }
 static struct kobj_attribute auth_mechanism = __ATTR_RO(mechanism);
-- 
2.47.0





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