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Subject[PATCH v4 2/3] HID: lenovo: Sync Fn-lock state on button press for Compact and TrackPoint II keyboards
Date
From: ValdikSS <iam@valdikss.org.ru>

When Fn-Esc is pressed on the keyboard, it emits the scancode which could
be used to sync the fn_lock sysfs state.

Previously fn_lock only allowed to set new Fn-lock state and did not
keep the value in sync upon Fn-Esc press, which is now fixed.

Signed-off-by: Florian Klink <flokli@flokli.de>
---
drivers/hid/hid-lenovo.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
index a612ae7dfbfc..e9466ae8a9cb 100644
--- a/drivers/hid/hid-lenovo.c
+++ b/drivers/hid/hid-lenovo.c
@@ -690,6 +690,15 @@ static int lenovo_event_cptkbd(struct hid_device *hdev,
return 1;
}

+ if (usage->type == EV_KEY && usage->code == KEY_FN_ESC && value == 1) {
+ /*
+ * The user has toggled the Fn-lock state. Toggle our own
+ * cached value of it and sync our value to the keyboard to
+ * ensure things are in sync (the syncing should be a no-op).
+ */
+ cptkbd_data->fn_lock = !cptkbd_data->fn_lock;
+ }
+
return 0;
}

--
2.35.1
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