Input: mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Warning level 2 was used: -Wimplicit-fallthrough=2

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/joystick/db9.c

@@ -259,6 +259,7 @@ static unsigned char db9_saturn_read_packet(struct parport *port, unsigned char
 			db9_saturn_write_sub(port, type, 3, powered, 0);
 			return data[0] = 0xe3;
 		}
+		/* else: fall through */
 	default:
 		return data[0];
 	}
@@ -278,11 +279,14 @@ static int db9_saturn_report(unsigned char id, unsigned char data[60], struct in
 		switch (data[j]) {
 		case 0x16: /* multi controller (analog 4 axis) */
 			input_report_abs(dev, db9_abs[5], data[j + 6]);
+			/* fall through */
 		case 0x15: /* mission stick (analog 3 axis) */
 			input_report_abs(dev, db9_abs[3], data[j + 4]);
 			input_report_abs(dev, db9_abs[4], data[j + 5]);
+			/* fall through */
 		case 0x13: /* racing controller (analog 1 axis) */
 			input_report_abs(dev, db9_abs[2], data[j + 3]);
+			/* fall through */
 		case 0x34: /* saturn keyboard (udlr ZXC ASD QE Esc) */
 		case 0x02: /* digital pad (digital 2 axis + buttons) */
 			input_report_abs(dev, db9_abs[0], !(data[j + 1] & 128) - !(data[j + 1] & 64));
@@ -376,6 +380,7 @@ static void db9_timer(struct timer_list *t)
 			input_report_abs(dev2, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
 			input_report_abs(dev2, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
 			input_report_key(dev2, BTN_TRIGGER, ~data & DB9_FIRE1);
+			/* fall through */
 
 		case DB9_MULTI_0802:
 

drivers/input/keyboard/adp5589-keys.c

@@ -885,6 +885,7 @@ static int adp5589_probe(struct i2c_client *client,
 	switch (id->driver_data) {
 	case ADP5585_02:
 		kpad->support_row5 = true;
+		/* fall through */
 	case ADP5585_01:
 		kpad->is_adp5585 = true;
 		kpad->var = &const_adp5585;

drivers/input/mouse/appletouch.c

@@ -472,6 +472,7 @@ static int atp_status_check(struct urb *urb)
 				dev->info->datalen, dev->urb->actual_length);
 			dev->overflow_warned = true;
 		}
+		/* fall through */
 	case -ECONNRESET:
 	case -ENOENT:
 	case -ESHUTDOWN:

drivers/input/mouse/cyapa_gen5.c

@@ -2554,6 +2554,7 @@ static int cyapa_gen5_do_operational_check(struct cyapa *cyapa)
 		}
 
 		cyapa->state = CYAPA_STATE_GEN5_APP;
+		/* fall through */
 
 	case CYAPA_STATE_GEN5_APP:
 		/*

drivers/input/mouse/cyapa_gen6.c

@@ -680,6 +680,7 @@ static int cyapa_gen6_operational_check(struct cyapa *cyapa)
 		}
 
 		cyapa->state = CYAPA_STATE_GEN6_APP;
+		/* fall through */
 
 	case CYAPA_STATE_GEN6_APP:
 		/*

drivers/input/mouse/elantech.c

@@ -340,7 +340,7 @@ static void elantech_report_absolute_v2(struct psmouse *psmouse)
 		 */
 		if (packet[3] & 0x80)
 			fingers = 4;
-		/* pass through... */
+		/* fall through */
 	case 1:
 		/*
 		 * byte 1:  .   .   .   .  x11 x10 x9  x8

drivers/input/mouse/sermouse.c

@@ -139,7 +139,8 @@ static void sermouse_process_ms(struct sermouse *sermouse, signed char data)
 			switch (sermouse->type) {
 
 				case SERIO_MS:
-					 sermouse->type = SERIO_MP;
+					sermouse->type = SERIO_MP;
+					/* fall through */
 
 				case SERIO_MP:
 					if ((data >> 2) & 3) break;	/* M++ Wireless Extension packet. */
@@ -150,6 +151,7 @@ static void sermouse_process_ms(struct sermouse *sermouse, signed char data)
 				case SERIO_MZP:
 				case SERIO_MZPP:
 					input_report_key(dev, BTN_SIDE,   (data >> 5) & 1);
+					/* fall through */
 
 				case SERIO_MZ:
 					input_report_key(dev, BTN_MIDDLE, (data >> 4) & 1);

drivers/input/touchscreen/elo.c

@@ -352,6 +352,7 @@ static int elo_connect(struct serio *serio, struct serio_driver *drv)
 
 	case 1: /* 6-byte protocol */
 		input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
+		/* fall through */
 
 	case 2: /* 4-byte protocol */
 		input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);