[PATCH] platform/x86: think-lmi: Add WMI certificate thumbprint support for ThinkCenter

[Mark Pearson <mpearson-lenovo@squebb.ca>]

The ThinkCenter team are adding WMI certificate thumbprint support.

Updating the driver to enable it. They are using the same GUID as
Thinkpad/ThinkStation.
Tested on M75q Gen 5.

Signed-off-by: Mark Pearson <mpearson-lenovo@squebb.ca>
---
 drivers/platform/x86/lenovo/think-lmi.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/lenovo/think-lmi.c b/drivers/platform/x86/lenovo/think-lmi.c
index 540b472b1bf3..c45f0206b4ab 100644
--- a/drivers/platform/x86/lenovo/think-lmi.c
+++ b/drivers/platform/x86/lenovo/think-lmi.c
@@ -195,7 +195,7 @@ static const struct tlmi_cert_guids thinkpad_cert_guid = {
 };
 
 static const struct tlmi_cert_guids thinkcenter_cert_guid = {
-	.thumbprint = NULL,
+	.thumbprint = LENOVO_CERT_THUMBPRINT_GUID, /* Same GUID as TP */
 	.set_bios_setting = LENOVO_TC_SET_BIOS_SETTING_CERT_GUID,
 	.save_bios_setting = LENOVO_TC_SAVE_BIOS_SETTING_CERT_GUID,
 	.cert_to_password = LENOVO_TC_CERT_TO_PASSWORD_GUID,
@@ -709,6 +709,10 @@ static ssize_t cert_thumbprint(char *buf, const char *arg, int count)
 	if (!tlmi_priv.cert_guid->thumbprint)
 		return -EOPNOTSUPP;
 
+	/* Older ThinkCenter BIOS may not have support */
+	if (!wmi_has_guid(tlmi_priv.cert_guid->thumbprint))
+		return -EOPNOTSUPP;
+
 	status = wmi_evaluate_method(tlmi_priv.cert_guid->thumbprint, 0, 0, &input, &output);
 	if (ACPI_FAILURE(status)) {
 		kfree(output.pointer);
-- 
2.43.0