[fingerprint] Disable sms/email led on fp wakeup. Fixes JB#43914

Type 6 led patterns are automatically deactivated when user does something
explicit to unblank device display. This deactivation is triggered in input
event processing. As fingerprint sensor use does not involve input events,
the led patterns are left active when user wakes up device with fp scanner.

Use synthetic input event to trigger led pattern deactivation.

Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

modules/fingerprint.c

@@ -25,6 +25,7 @@
 #include "../mce-log.h"
 #include "../mce-dbus.h"
 #include "../mce-setting.h"
+#include "../evdev.h"
 
 #include <linux/input.h>
 
@@ -2651,6 +2652,20 @@ fpwakeup_trigger(void)
 
         /* Exit from lockscreen */
         mce_datapipe_request_tklock(TKLOCK_REQUEST_OFF);
+
+        /* Deactivate type=6 led patterns (e.g. sms/email notifications)
+         * by signaling "true user activity" via synthetized gesture
+         * input event. (The event type ought not matter, but using
+         * double tap event is somewhat logical and does not cause side
+         * effects in the few places where the event type is actually
+         * checked.)
+         */
+        const struct input_event ev = {
+            .type  = EV_MSC,
+            .code  = MSC_GESTURE,
+            .value = GESTURE_DOUBLETAP | GESTURE_SYNTHESIZED,
+        };
+        datapipe_exec_full(&user_activity_event_pipe, &ev);
     }
 }