thinkpad_acpi: unhandled hkey event

Pressing Fn+Esc in a Lenovo Thinkpad x240 to lock the Fn keys generates
an unhandled hkey event

Signed-off-by: Xavier Naveira <xnaveira@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

drivers/platform/x86/thinkpad_acpi.c

@@ -196,6 +196,7 @@ enum tpacpi_hkey_event_t {
 	/* Key-related user-interface events */
 	TP_HKEY_EV_KEY_NUMLOCK		= 0x6000, /* NumLock key pressed */
 	TP_HKEY_EV_KEY_FN		= 0x6005, /* Fn key pressed? E420 */
+	TP_HKEY_EV_KEY_FN_ESC           = 0x6060, /* Fn+Esc key pressed X240 */
 
 	/* Thermal events */
 	TP_HKEY_EV_ALARM_BAT_HOT	= 0x6011, /* battery too hot */
@@ -3712,6 +3713,7 @@ static bool hotkey_notify_6xxx(const u32 hkey,
 
 	case TP_HKEY_EV_KEY_NUMLOCK:
 	case TP_HKEY_EV_KEY_FN:
+	case TP_HKEY_EV_KEY_FN_ESC:
 		/* key press events, we just ignore them as long as the EC
 		 * is still reporting them in the normal keyboard stream */
 		*send_acpi_ev = false;