Input: i8042 - increment wakeup_count for the respective port

Call pm_wakeup_event on every interrupt. This should help us in identifying
if keyboard was a potential wake reason for the last resume.
Signed-off-by: NRavi Chandra Sadineni <ravisadineni@chromium.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/serio/i8042.c

@@ -573,6 +573,9 @@ static irqreturn_t i8042_interrupt(int irq, void *dev_id)
 	port = &i8042_ports[port_no];
 	serio = port->exists ? port->serio : NULL;
 
+	if (irq && serio)
+		pm_wakeup_event(&serio->dev, 0);
+
 	filter_dbg(port->driver_bound, data, "<- i8042 (interrupt, %d, %d%s%s)\n",
 		   port_no, irq,
 		   dfl & SERIO_PARITY ? ", bad parity" : "",