[PATCH v4 3/3] platform/x86: dell-wmi: add new dmi mapping for keycode 0xffff

[Y Paritcher <y.linux@paritcher.com>]

This keycode is used by Dell as a no-op for keys that should have
no function.

This keycode is never triggered by a keypress in practice, rather
it is included from the 0xB2 DMI table at startup.

This prevents the following messages from being logged at startup on a
Dell Inspiron 5593:

    dell_wmi: firmware scancode 0x48 maps to unrecognized keycode 0xffff
    dell_wmi: firmware scancode 0x50 maps to unrecognized keycode 0xffff

as per this code comment:

   Log if we find an entry in the DMI table that we don't
   understand.  If this happens, we should figure out what
   the entry means and add it to bios_to_linux_keycode.

Signed-off-by: Y Paritcher <y.linux@paritcher.com>
---
 drivers/platform/x86/dell-wmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
index e3bc2601e631..bbdb3e860892 100644
--- a/drivers/platform/x86/dell-wmi.c
+++ b/drivers/platform/x86/dell-wmi.c
@@ -506,7 +506,7 @@ static void handle_dmi_entry(const struct dmi_header *dm, void *opaque)
 		u16 keycode = (bios_entry->keycode <
 			       ARRAY_SIZE(bios_to_linux_keycode)) ?
 			bios_to_linux_keycode[bios_entry->keycode] :
-			KEY_RESERVED;
+			(bios_entry->keycode == 0xffff ? KEY_UNKNOWN : KEY_RESERVED);
 
 		/*
 		 * Log if we find an entry in the DMI table that we don't
-- 
2.27.0