[PATCH 1/4] platform/x86: think-lmi: Enable opcode support on BIOS settings

From: Mark Pearson
Date: Wed May 17 2023 - 14:20:04 EST


Whilst reviewing some documentation from the FW team on using WMI on
Lenovo system I noticed that we weren't using Opcode support when
changing BIOS settings in the thinkLMI driver.

We should be doing this to ensure we're future proof as the old
non-opcode mechanism has been deprecated.

Tested on X1 Carbon G10 and G11.

Signed-off-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx>
---
drivers/platform/x86/think-lmi.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index 1138f770149d..d9341305eba9 100644
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -1001,7 +1001,28 @@ static ssize_t current_value_store(struct kobject *kobj,
tlmi_priv.pwd_admin->save_signature);
if (ret)
goto out;
- } else { /* Non certiifcate based authentication */
+ } else if (tlmi_priv.opcode_support) {
+ /* If opcode support is present use that interface */
+ set_str = kasprintf(GFP_KERNEL, "%s,%s;", setting->display_name,
+ new_setting);
+ if (!set_str) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTINGS_GUID, set_str);
+ if (ret)
+ goto out;
+
+ if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
+ ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
+ tlmi_priv.pwd_admin->password);
+ if (ret)
+ goto out;
+ }
+
+ ret = tlmi_save_bios_settings("");
+ } else { /* old non opcode based authentication method (deprecated)*/
if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
tlmi_priv.pwd_admin->password,
--
2.40.1