[PATCH] ideapad-laptop: Fix Legion 5 Fn lock LED

[Meng Dong <whenov@gmail.com>]

This patch fixes the bug 212671.
Althrough the Fn lock (Fn + Esc) works on Legion 5 (R7000P), its LED
light does not change with the state. This modification sets the Fn lock
state to its current value on receiving the wmi event
8FC0DE0C-B4E4-43FD-B0F3-8871711C1294 to update the LED state.

Signed-off-by: Meng Dong <whenov@gmail.com>
---
Another possible approach is to call `ideapad_input_report(priv, value)`
to send a keycode and let the user handle the LED by echoing the current
value of /sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/fn_lock back
into itself. But the problem with this approach is Fn+F9 and Fn+Esc
trigger the same WMI GUID and event value and I have no idea how to
distinguish them.

 drivers/platform/x86/ideapad-laptop.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 784326bd72f0..48561b666547 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -41,6 +41,7 @@
 static const char *const ideapad_wmi_fnesc_events[] = {
 	"26CAB2E5-5CF1-46AE-AAC3-4A12B6BA50E6", /* Yoga 3 */
 	"56322276-8493-4CE8-A783-98C991274F5E", /* Yoga 700 */
+	"8FC0DE0C-B4E4-43FD-B0F3-8871711C1294", /* Legion 5 */
 };
 #endif
 
@@ -1464,6 +1465,15 @@ static void ideapad_wmi_notify(u32 value, void *context)
 	case 128:
 		ideapad_input_report(priv, value);
 		break;
+	case 208:
+		unsigned long result;
+
+		if (!eval_hals(priv->adev->handle, &result)) {
+			bool state = test_bit(HALS_FNLOCK_STATE_BIT, &result);
+
+			exec_sals(priv->adev->handle, state ? SALS_FNLOCK_ON : SALS_FNLOCK_OFF);
+		}
+		break;
 	default:
 		dev_info(&priv->platform_device->dev,
 			 "Unknown WMI event: %u\n", value);
-- 
2.32.0